81 results match your criteria Atmospheric Chemistry And Physics[Journal]


Simulation of organic aerosol formation during the CalNex study: updated mobile emissions and secondary organic aerosol parameterization for intermediate-volatility organic compounds.

Atmos Chem Phys 2020 Apr;20(7):4313-4332

Center of Atmospheric Particle Studies, Carnegie Mellon University, Pittsburgh, PA, USA.

We describe simulations using an updated version of the Community Multiscale Air Quality model version 5.3 (CMAQ v5.3) to investigate the contribution of intermediate-volatility organic compounds (IVOCs) to secondary organic aerosol (SOA) formation in southern California during the CalNex study. Read More

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http://dx.doi.org/10.5194/acp-20-4313-2020DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7252505PMC

Impact of halogen chemistry on summertime air quality in coastal and continental Europe: application of the CMAQ model and implications for regulation.

Atmos Chem Phys 2019 Dec;19(24):15321-15337

Department of Atmospheric Chemistry and Climate, Institute of Physical Chemistry Rocasolano, CSIC, Madrid 28006, Spain.

Halogen (Cl, Br, and I) chemistry has been reported to influence the formation of secondary air pollutants. Previous studies mostly focused on the impact of chlorine species on air quality over large spatial scales. Very little attention has been paid to the effect of the combined halogen chemistry on air quality over Europe and its implications for control policy. Read More

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http://dx.doi.org/10.5194/acp-19-15321-2019DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7232855PMC
December 2019

Modeling stratospheric intrusion and trans-Pacific transport on tropospheric ozone using hemispheric CMAQ during April 2010 - Part 2: Examination of emission impacts based on the higher-order decoupled direct method.

Atmos Chem Phys 2020 Mar;20(6):3397-3413

Department of Marine, Earth, and Atmospheric Sciences (MEAS), North Carolina State University (NCSU), Campus Box 8208, Raleigh, NC 27695, USA.

The state-of-the-science Community Multiscale Air Quality (CMAQ) modeling system, which has recently been extended for hemispheric-scale modeling applications (referred to as H-CMAQ), is applied to study the trans-Pacific transport, a phenomenon recognized as a potential source of air pollution in the US, during April 2010. The results of this analysis are presented in two parts. In the previous paper (Part 1), model evaluation for tropospheric ozone (O) was presented and an air mass characterization method was developed. Read More

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http://dx.doi.org/10.5194/acp-20-3397-2020DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7180064PMC

Modeling stratospheric intrusion and trans-Pacific transport on tropospheric ozone using hemispheric CMAQ during April 2010 - Part 1: Model evaluation and air mass characterization for stratosphere-troposphere transport.

Atmos Chem Phys 2020 Mar;20(6):3373-3396

Department of Marine, Earth, and Atmospheric Sciences (MEAS), North Carolina State University (NCSU), Campus Box 8208, Raleigh, NC 27695, USA.

Stratospheric intrusion and trans-Pacific transport have been recognized as a potential source of tropospheric ozone over the US. The state-of-the-science Community Multiscale Air Quality (CMAQ) modeling system has recently been extended for hemispheric-scale modeling applications (referred to as H-CMAQ). In this study, H-CMAQ is applied to study the stratospheric intrusion and trans-Pacific transport during April 2010. Read More

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http://dx.doi.org/10.5194/acp-20-3373-2020DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7180063PMC

On the Limit to the Accuracy of Regional-Scale Air Quality Models.

Atmos Chem Phys 2020 Feb;20(3):1627-1639

Center for Environmental Measurement & Modeling, U.S. Environmental Protection Agency, Research Triangle Park, NC.

Regional-scale air pollution models are routinely being used world-wide for research, forecasting air quality, and regulatory purposes. It is well recognized that there are both reducible (systematic) and irreducible (unsystematic) errors in the meteorology-atmospheric chemistry modeling systems. The inherent (random) uncertainty stems from our inability to properly characterize stochastic variations in atmospheric dynamics and chemistry, and from the incommensurability associated with comparisons of the volume-averaged model estimates with point measurements. Read More

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http://dx.doi.org/10.5194/acp-20-1627-2020DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7048235PMC
February 2020

Physical properties of secondary photochemical aerosol from OH oxidation of a cyclic siloxane.

Atmos Chem Phys 2019 8;19(3):1649-1664. Epub 2019 Feb 8.

Department of Chemical and Biochemical Engineering, University of Iowa, Iowa City, IA, USA.

Cyclic volatile methyl siloxanes (cVMS) are high-production chemicals present in many personal care products. They are volatile, hydrophobic, and relatively long-lived due to slow oxidation kinetics. Evidence from chamber and ambient studies indicates that oxidation products may be found in the condensed aerosol phase. Read More

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http://dx.doi.org/10.5194/acp-19-1649-2019DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6936766PMC
February 2019

UV spectroscopic determination of the chlorine monoxide (ClO) / chlorine peroxide (ClOOCl) thermal equilibrium constant.

Atmos Chem Phys 2019 May;19(9):6205-6215

Harvard John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA 02138, USA.

The thermal equilibrium constant between the chlorine monoxide radical (ClO) and its dimer, chlorine peroxide (ClOOCl), was determined as a function of temperature between 228 and 301K in a discharge flow apparatus using broadband UV absorption spectroscopy. A third-law fit of the equilibrium values determined from the experimental data provides the expression = 2.16 × 10 cm molecule (1σ uncertainty). Read More

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http://dx.doi.org/10.5194/acp-19-6205-2019DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6800689PMC

Estimating vehicle carbon dioxide emissions from Boulder, Colorado, using horizontal path-integrated column measurements.

Atmos Chem Phys 2019 ;19

Applied Physics Division, Physical Measurement Laboratory, National Institute of Standards and Technology, 325 Broadway, Boulder, CO 80305, USA.

We performed 7.5 weeks of path-integrated concentration measurements of CO, CH, HO, and HDO over the city of Boulder, Colorado. An open-path dual-comb spectrometer simultaneously measured time-resolved data across a reference path, located near the mountains to the west of the city, and across an over-city path that intersected two-thirds of the city, including two major commuter arteries. Read More

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http://dx.doi.org/10.5194/acp-19-4177-2019DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6759866PMC
January 2019
2 Reads

Taehwa Research Forest: A receptor site for severe domestic pollution events in Korea during 2016.

Atmos Chem Phys 2019 ;19(7):5051-5067

California Air Resources Board, Sacramento, CA, 95814, USA.

During the May-June 2016 International Cooperative Air Quality Field Study in Korea (KORUS-AQ), light synoptic meteorological forcing facilitated Seoul metropolitan pollution outflow to reach the remote Taehwa Research Forest (TRF) site and cause regulatory exceedances of ozone on 24 days. Two of these severe pollution events are thoroughly examined. The first, occurring on 17 May 2016, tracks transboundary pollution transport exiting eastern China and the Yellow Sea, traversing the Seoul Metropolitan Area (SMA), and then reaching TRF in the afternoon hours with severely polluted conditions. Read More

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http://dx.doi.org/10.5194/acp-19-5051-2019DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6750018PMC
January 2019
1 Read

Composition and light absorption of N-containing aromatic compounds in organic aerosols from laboratory biomass burning.

Atmos Chem Phys 2019 ;19(5):2899-2915

National Risk Management Research Laboratory, Office of Research and Development, U.S. Environmental Protection Agency, 109 T.W. Alexander Drive, Research Triangle Pak, NC 27711, USA.

This study seeks to understand the compositional details of N-containing aromatic compounds (NACs) emitted during biomass burning (BB) and their contribution to light-absorbing organic carbon (OC), also termed brown carbon (BrC). Three laboratory BB experiments were conducted with two U.S. Read More

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http://dx.doi.org/10.5194/acp-19-2899-2019DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6733279PMC
January 2019
2 Reads

Extending the SBUV PMC Data Record with OMPS NP.

Atmos Chem Phys 2019 14;19(11):7913-7925. Epub 2019 Jun 14.

Laboratory for Atmospheric and Space Physics (LASP)/University of Colorado, Boulder, Colorado 80303 USA.

We have utilized Solar Backscatter Ultraviolet (SBUV) instrument measurements of atmospheric radiance to create a 40-year record of polar mesospheric cloud (PMC) behavior. While this series of measurements is nearing its end, we show in this paper that Ozone Mapping and Profiling Suite (OMPS) Nadir Profiler (NP) instruments can be added to the merged SBUV PMC data record. Regression analysis of this extended record shows smaller trends in PMC ice water content (IWC) since approximately 1998, consistent with previous work. Read More

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http://dx.doi.org/10.5194/acp-19-7913-2019DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6687313PMC

Intercomparison of atmospheric trace gas dispersion models: Barnett Shale case study.

Atmos Chem Phys 2019 ;19

Special Programs Office, National Institute of Standards and Technology, Gaithersburg, MD, USA.

Greenhouse gas emissions mitigation requires understanding the dominant processes controlling fluxes of these trace gases at increasingly finer spatial and temporal scales. Trace gas fluxes can be estimated using a variety of approaches that translate observed atmospheric species mole fractions into fluxes or emission rates, often identifying the spatial and temporal characteristics of the emission sources as well. Meteorological models are commonly combined with tracer dispersion models to estimate fluxes using an inverse approach that optimizes emissions to best fit the trace gas mole fraction observations. Read More

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http://dx.doi.org/10.5194/acp-19-2561-2019DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6605086PMC
January 2019
2 Reads

Modelling black carbon absorption of solar radiation: combining external and internal mixing assumptions.

Atmos Chem Phys 2019 7;19(1):181-204. Epub 2019 Jan 7.

Joint Research Centre (JRC), European Commission, Ispra (VA), 21027, Italy.

An accurate simulation of the absorption properties is key for assessing the radiative effects of aerosol on meteorology and climate. The representation of how chemical species are mixed inside the particles (the mixing state) is one of the major uncertainty factors in the assessment of these effects. Here we compare aerosol optical properties simulations over Europe and North America, coordinated in the framework of the third phase of the Air Quality Model Evaluation International Initiative (AQMEII), to 1 year of AERONET sunphotometer retrievals, in an attempt to identify a mixing state representation that better reproduces the observed single scattering albedo and its spectral variation. Read More

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http://dx.doi.org/10.5194/acp-19-181-2019DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6392454PMC
January 2019
21 Reads

Seasonal ozone vertical profiles over North America using the AQMEII3 group of air quality models: model inter-comparison and stratospheric intrusions.

Atmos Chem Phys 2018 2;18(19):13925-13945. Epub 2018 Oct 2.

Ramboll, 773 San Marin Dr., Suite 2115, Novato, CA 94945, USA.

This study evaluates simulated vertical ozone profiles produced in the framework of the third phase of the Air Quality Model Evaluation International Initiative (AQMEII3) against ozonesonde observations in North America for the year 2010. Four research groups from the United States (US) and Europe have provided modeled ozone vertical profiles to conduct this analysis. Because some of the modeling systems differ in their meteorological drivers, wind speed and temperature are also included in the analysis. Read More

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http://dx.doi.org/10.5194/acp-18-13925-2018DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6382018PMC
October 2018
28 Reads

Development and application of observable response indicators for design of an effective ozone and fine particle pollution control strategy in China.

Atmos Chem Phys 2019 ;19(21):13627-13646

State Key Joint Laboratory of Environmental Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China.

Designing effective control policies requires efficient quantification of the nonlinear response of air pollution to emissions. However, neither the current observable indicators nor the current indicators based on response-surface modeling (RSM) can fulfill this requirement. Therefore, this study developed new observable RSM-based indicators and applied them to ambient fine particle (PM) and ozone (O) pollution control in China. Read More

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http://dx.doi.org/10.5194/acp-19-13627-2019DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7147762PMC
January 2019

Mechanistic study of the formation of ring-retaining and ring-opening products from the oxidation of aromatic compounds under urban atmospheric conditions.

Atmos Chem Phys 2019 13;19(23):15117-15129. Epub 2019 Dec 13.

John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, MA02138, USA.

Aromatic hydrocarbons make up a large fraction of anthropogenic volatile organic compounds and contribute significantly to the production of tropospheric ozone and secondary organic aerosol (SOA). Four toluene and four 1,2,4-trimethylbenzene (1,2,4-TMB) photooxidation experiments were performed in an environmental chamber under relevant polluted conditions (NO ~ 10ppb). An extensive suite of instrumentation including two proton-transfer-reaction mass spectrometers (PTR-MS) and two chemical ionisation mass spectrometers ( CIMS and I CIMS) allowed for quantification of reactive carbon in multiple generations of hydroxyl radical (OH)-initiated oxidation. Read More

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http://dx.doi.org/10.5194/acp-19-15117-2019DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7133713PMC
December 2019

Reanalysis intercomparisons of stratospheric polar processing diagnostics.

Atmos Chem Phys 2018 25;18(18):13547-13579. Epub 2018 Sep 25.

NASA/Goddard Space Flight Center, Greenbelt, MD USA.

We compare herein polar processing diagnostics derived from the four most recent full-input reanalysis datasets: the National Centers for Environmental Prediction Climate Forecast System Reanalysis / Climate Forecast System, version 2 (CFSR/CFSv2), the European Centre for Medium-Range Weather Forecasts Interim Reanalysis (ERA-Interim), the Japanese Meteorological Agency's Japanese 55-year Reanalysis (JRA-55), and the National Aeronautics and Space Administration's Modern Era Retrospective-analysis for Research and Applications version 2 (MERRA-2). We focus on diagnostics based on temperatures and potential vorticity (PV) in the lower to middle stratosphere that are related to formation of polar stratospheric clouds (PSCs), chlorine activation, and the strength, size, and longevity of the stratospheric polar vortex. Polar minimum temperatures (T) and the area of regions having temperatures below PSC formation thresholds (A) show large persistent differences between the reanalyses, especially in the southern hemisphere (SH), for years prior to 1999. Read More

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http://dx.doi.org/10.5194/acp-18-13547-2018DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6299841PMC
September 2018
3 Reads

Chemical composition of isoprene SOA under acidic and non-acidic conditions: effect of relative humidity.

Atmos Chem Phys 2018 Dec;18(24):18101-18121

Environmental Chemistry Group, Institute of Physical Chemistry Polish Academy of Sciences, 01-224 Warsaw, Poland.

The effect of acidity and relative humidity on bulk isoprene aerosol parameters has been investigated in several studies; however, few measurements have been conducted on individual aerosol compounds. The focus of this study has been the examination of the effect of acidity and relative humidity on secondary organic aerosol (SOA) chemical composition from isoprene photooxidation in the presence of nitrogen oxide (NO ). A detailed characterization of SOA at the molecular level was also investigated. Read More

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http://dx.doi.org/10.5194/acp-18-18101-2018DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7063744PMC
December 2018

Modeled deposition of nitrogen and sulfur in Europe estimated by 14 air quality model systems: evaluation, effects of changes in emissions and implications for habitat protection.

Atmos Chem Phys 2018 Jul;18(14):10199-10218

European Commission, Joint Research Centre (JRC), Ispra (VA), Italy.

The evaluation and intercomparison of air quality models is key to reducing model errors and uncertainty. The projects AQMEII3 and EURODELTA-Trends, in the framework of the Task Force on Hemispheric Transport of Air Pollutants and the Task Force on Measurements and Modelling, respectively (both task forces under the UNECE Convention on the Long Range Transport of Air Pollution, LTRAP), have brought together various regional air quality models to analyze their performance in terms of air concentrations and wet deposition, as well as to address other specific objectives. This paper jointly examines the results from both project communities by intercomparing and evaluating the deposition estimates of reduced and oxidized nitrogen (N) and sulfur (S) in Europe simulated by 14 air quality model systems for the year 2010. Read More

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http://dx.doi.org/10.5194/acp-18-10199-2018DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6235743PMC
July 2018
12 Reads

Constraining chemical transport PM modeling outputs using surface monitor measurements and satellite retrievals: application over the San Joaquin Valley.

Atmos Chem Phys 2018 Jul;18(17):12891-12913

School of Civil & Environmental Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA.

Advances in satellite retrieval of aerosol type can improve the accuracy of near-surface air quality characterization by providing broad regional context and decreasing metric uncertainties and errors. The frequent, spatially extensive and radiometrically consistent instantaneous constraints can be especially useful in areas away from ground monitors and progressively downwind of emission sources. We present a physical approach to constraining regional-scale estimates of PM. Read More

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https://www.atmos-chem-phys.net/18/12891/2018/
Publisher Site
http://dx.doi.org/10.5194/acp-18-12891-2018DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6166888PMC
July 2018
4 Reads

Influence of anthropogenic emissions and boundary conditions on multi-model simulations of major air pollutants over Europe and North America in the framework of AQMEII3.

Atmos Chem Phys 2018 ;18(12):8929-8952

European Commission, Joint Research Centre (JRC), Ispra, Italy.

In the framework of the third phase of the Air Quality Model Evaluation International Initiative (AQMEII3), and as contribution to the second phase of the Hemispheric Transport of Air Pollution (HTAP2) activities for Europe and North America, the impacts of a 20 % decrease of global and regional anthropogenic emissions on surface air pollutant levels in 2010 are simulated by an international community of regional-scale air quality modeling groups, using different state-of-the-art chemistry and transport models (CTMs). The emission perturbations at the global level, as well as over the HTAP2-defined regions of Europe, North America and East Asia, are first simulated by the global Composition Integrated Forecasting System (C-IFS) model from European Centre for Medium-Range Weather Forecasts (ECMWF), which provides boundary conditions to the various regional CTMs participating in AQMEII3. On top of the perturbed boundary conditions, the regional CTMs used the same set of perturbed emissions within the regional domain for the different perturbation scenarios that introduce a 20 % reduction of anthropogenic emissions globally as well as over the HTAP2-defined regions of Europe, North America and East Asia. Read More

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http://dx.doi.org/10.5194/acp-18-8929-2018DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6104647PMC
January 2018
36 Reads

Assessment and economic valuation of air pollution impacts on human health over Europe and the United States as calculated by a multi-model ensemble in the framework of AQMEII3.

Atmos Chem Phys 2018 Apr;18(8):5967-5989

European Commission, Joint Research Centre (JRC), Ispra, Italy.

The impact of air pollution on human health and the associated external costs in Europe and the United States (US) for the year 2010 are modeled by a multi-model ensemble of regional models in the frame of the third phase of the Air Quality Modelling Evaluation International Initiative (AQMEII3). The modeled surface concentrations of O, CO, SO and PM are used as input to the Economic Valuation of Air Pollution (EVA) system to calculate the resulting health impacts and the associated external costs from each individual model. Along with a base case simulation, additional runs were performed introducing 20 % anthropogenic emission reductions both globally and regionally in Europe, North America and east Asia, as defined by the second phase of the Task Force on Hemispheric Transport of Air Pollution (TF-HTAP2). Read More

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http://dx.doi.org/10.5194/acp-18-5967-2018DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6070159PMC
April 2018
34 Reads

Impacts of different characterizations of large-scale background on simulated regional-scale ozone over the continental United States.

Atmos Chem Phys 2018 ;18(5):3839-3864

School of Earth and Environmental Sciences, Seoul National University, Seoul, South Korea.

This study analyzes simulated regional-scale ozone burdens both near the surface and aloft, estimates process contributions to these burdens, and calculates the sensitivity of the simulated regional-scale ozone burden to several key model inputs with a particular emphasis on boundary conditions derived from hemispheric or global-scale models. The Community Multiscale Air Quality (CMAQ) model simulations supporting this analysis were performed over the continental US for the year 2010 within the context of the Air Quality Model Evaluation International Initiative (AQMEII) and Task Force on Hemispheric Transport of Air Pollution (TF-HTAP) activities. CMAQ process analysis (PA) results highlight the dominant role of horizontal and vertical advection on the ozone burden in the mid-to-upper troposphere and lower stratosphere. Read More

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http://dx.doi.org/10.5194/acp-18-3839-2018DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6071430PMC
January 2018
12 Reads

Long-term trends in total inorganic nitrogen and sulfur deposition in the U.S. from 1990 to 2010.

Atmos Chem Phys 2018 27;18(12):9091-9106. Epub 2018 Jun 27.

US Environmental Protection Agency, Research Triangle Park, NC 27711, USA.

Excess deposition (including both wet and dry deposition) of nitrogen and sulfur are detrimental to ecosystems. Recent studies have investigated the spatial patterns and temporal trends of nitrogen and sulfur wet deposition, but few studies have focused on dry deposition due to the scarcity of dry deposition measurements. Here, we use long-term model simulations from the coupled WRF-CMAQ model covering the period from 1990 to 2010 to study changes in spatial distribution as well as temporal trends in total (TDEP), wet (WDEP) and dry deposition (DDEP) of total inorganic nitrogen (TIN) and sulfur (TSO). Read More

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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6069975PMC
http://dx.doi.org/10.5194/acp-18-9091-2018DOI Listing
June 2018
4 Reads

Nonlinear response of tropical lower stratospheric temperature and water vapor to ENSO.

Atmos Chem Phys 2018 5;18(7):4597-4615. Epub 2018 Apr 5.

NASA Goddard Space Flight Center, Greenbelt, MD, USA.

A series of simulations using the NASA Goddard Earth Observing System Chemistry-Climate Model are analyzed in order to assess interannual and sub-decadal variability in the tropical lower stratosphere over the past 35 years. The impact of El Niño-Southern Oscillation on temperature and water vapor in this region is nonlinear in boreal spring. While moderate El Niño events lead to cooling in this region, strong El Niño events lead to warming, even as the response of the large scale Brewer Dobson Circulation appears to scale nearly linearly with El Niño. Read More

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http://dx.doi.org/10.5194/acp-18-4597-2018DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6041696PMC
April 2018
18 Reads
5.050 Impact Factor

Southeast Atmosphere Studies: learning from model-observation syntheses.

Atmos Chem Phys 2018 22;18(4):2615-2651. Epub 2018 Feb 22.

Geophysical Fluid Dynamics Laboratory-National Oceanic and Atmospheric Administration, Princeton, NJ, USA.

Concentrations of atmospheric trace species in the United States have changed dramatically over the past several decades in response to pollution control strategies, shifts in domestic energy policy and economics, and economic development (and resulting emission changes) elsewhere in the world. Reliable projections of the future atmosphere require models to not only accurately describe current atmospheric concentrations, but to do so by representing chemical, physical and biological processes with conceptual and quantitative fidelity. Only through incorporation of the processes controlling emissions and chemical mechanisms that represent the key transformations among reactive molecules can models reliably project the impacts of future policy, energy and climate scenarios. Read More

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http://dx.doi.org/10.5194/acp-18-2615-2018DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6020695PMC
February 2018
32 Reads

Coupling of organic and inorganic aerosol systems and the effect on gas-particle partitioning in the southeastern US.

Atmos Chem Phys 2018 Jan;18(1):357-370

Department of Environmental Science, Policy, and Management, University of California, Berkeley, California, USA.

Several models were used to describe the partitioning of ammonia, water, and organic compounds between the gas and particle phases for conditions in the southeastern US during summer 2013. Existing equilibrium models and frameworks were found to be sufficient, although additional improvements in terms of estimating pure-species vapor pressures are needed. Thermodynamic model predictions were consistent, to first order, with a molar ratio of ammonium to sulfate of approximately 1. Read More

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http://dx.doi.org/10.5194/acp-18-357-2018DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6020690PMC
January 2018
6 Reads

Karymsky volcano eruptive plume properties based on MISR multi-angle imagery, and volcanological implications.

Atmos Chem Phys 2018 20;18(6):3903-3918. Epub 2018 Mar 20.

Climate and Radiation Laboratory, Earth Science Division, NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA.

Space-based, operational instruments are in unique positions to monitor volcanic activity globally, especially in remote locations or where suborbital observing conditions are hazardous. The Multi-angle Imaging SpectroRadiometer (MISR) provides hyper-stereo imagery, from which the altitude and microphysical properties of suspended atmospheric aerosols can be derived. These capabilities are applied to plumes emitted at Karymsky volcano from 2000 to 2017. Read More

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http://dx.doi.org/10.5194/acp-18-3903-2018DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5996395PMC
March 2018
2 Reads

Impact of intercontinental pollution transport on North American ozone air pollution: an HTAP phase 2 multi-model study.

Atmos Chem Phys 2017 May;17:5721-5750

Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USA.

The recent update on the US National Ambient Air Quality Standards (NAAQS) of the ground-level ozone (O/ can benefit from a better understanding of its source contributions in different US regions during recent years. In the Hemispheric Transport of Air Pollution experiment phase 1 (HTAP1), various global models were used to determine the O source-receptor (SR) relationships among three continents in the Northern Hemisphere in 2001. In support of the HTAP phase 2 (HTAP2) experiment that studies more recent years and involves higher-resolution global models and regional models' participation, we conduct a number of regional-scale Sulfur Transport and dEposition Model (STEM) air quality base and sensitivity simulations over North America during May-June 2010. Read More

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http://dx.doi.org/10.5194/acp-17-5721-2017DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5954439PMC
May 2017
48 Reads

The impact of nonuniform sampling on stratospheric ozone trends derived from occultation instruments.

Atmos Chem Phys 2018 Feb 18;18(2):535-554. Epub 2018 Jan 18.

University of Toronto, Department of Physics, Toronto, Ontario, Canada.

This paper applies a recently developed technique for deriving long-term trends in ozone from sparsely sampled data sets to multiple occultation instruments simultaneously without the need for homogenization. The technique can compensate for the nonuniform temporal, spatial, and diurnal sampling of the different instruments and can also be used to account for biases and drifts between instruments. These problems have been noted in recent international assessments as being a primary source of uncertainty that clouds the significance of derived trends. Read More

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http://dx.doi.org/10.5194/acp-18-535-2018DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7306915PMC
February 2018

CALIPSO (IIR-CALIOP) Retrievals of Cirrus Cloud Ice Particle Concentrations.

Atmos Chem Phys 2018 6;18(23):17325-17354. Epub 2018 Dec 6.

George Mason University, Fairfax, Virginia, USA.

A new satellite remote sensing method is described whereby the sensitivity of thermal infrared wave resonance absorption to small ice crystals is exploited to estimate cirrus cloud ice particle number concentration N, effective diameter D, and ice water content IWC. This method uses co-located observations from the Infrared Imaging Radiometer (IIR) and from the CALIOP () lidar aboard the CALIPSO ( polar orbiting satellite, employing IIR channels at 10.6 μm and 12. Read More

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http://dx.doi.org/10.5194/acp-18-17325-2018DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6818510PMC
December 2018

Impact of aerosols on ice crystal size.

Atmos Chem Phys 2018 ;18:1065-1078

Joint Institute for Regional Earth System Science and Engineering and Department of Atmospheric and Oceanic Sciences, University of California, Los Angeles, California 90095, USA.

The interactions between aerosols and ice clouds represent one of the largest uncertainties in global radiative forcing from pre-industrial time to the present. In particular, the impact of aerosols on ice crystal effective radius (), which is a key parameter determining ice clouds' net radiative effect, is highly uncertain due to limited and conflicting observational evidence. Here we investigate the effects of aerosols on under different meteorological conditions using 9-year satellite observations. Read More

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https://www.atmos-chem-phys.net/18/1065/2018/
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http://dx.doi.org/10.5194/acp-18-1065-2018DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6750036PMC
January 2018
1 Read

Attributing differences in the fate of lateral boundary ozone in AQMEII3 models to physical process representations.

Atmos Chem Phys 2018 5;18(23):17157-17175. Epub 2018 Dec 5.

National Exposure Research Laboratory, US Environmental Protection Agency, Research Triangle Park, NC 27711, USA.

Increasing emphasis has been placed on characterizing the contributions and the uncertainties of ozone imported from outside the US. In chemical transport models (CTMs), the ozone transported through lateral boundaries (referred to as LB ozone hereafter) undergoes a series of physical and chemical processes in CTMs, which are important sources of the uncertainty in estimating the impact of LB ozone on ozone levels at the surface. By implementing inert tracers for LB ozone, the study seeks to better understand how differing representations of physical processes in regional CTMs may lead to differences in the simulated LB ozone that eventually reaches the surface across the US. Read More

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http://dx.doi.org/10.5194/acp-18-17157-2018DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6687296PMC
December 2018

Intra-annual variations of regional aerosol optical depth, vertical distribution, and particle types from multiple satellite and ground-based observational datasets.

Atmos Chem Phys 2018 13;18(15):11247-11260. Epub 2018 Aug 13.

NASA Langley Research Center, Hampton, Virginia, USA.

The climatic and health effects of aerosols are strongly dependent on the intra-annual variations in their loading and properties. While the seasonal variations of regional aerosol optical depth (AOD) have been extensively studied, understanding the temporal variations in aerosol vertical distribution and particle types is also important for an accurate estimate of aerosol climatic effects. In this paper, we combine the observations from four satellite-borne sensors and several ground-based networks to investigate the seasonal variations of aerosol column loading, vertical distribution, and particle types over three populous regions: the Eastern United States (EUS), Western Europe (WEU), and Eastern and Central China (ECC). Read More

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http://dx.doi.org/10.5194/acp-18-11247-2018DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6501591PMC

The potential effects of climate change on air quality across the conterminous U.S. at 2030 under three Representative Concentration Pathways.

Atmos Chem Phys 2018 ;18(20):15471-15489

Office of Air Quality Planning and Standards, U.S. Environmental Protection Agency, Research Triangle Park, North Carolina, USA.

The potential impacts of climate change on regional ozone (O) and fine particulate (PM) air quality in the United States are investigated by linking global climate simulations with regional scale meteorological and chemical transport models. Regional climate at 2000 and at 2030 under three Representative Concentration Pathways (RCPs) is simulated by using the Weather Research and Forecasting (WRF) model to downscale 11-year time slices from the Community Earth System Model (CESM). The downscaled meteorology is then used with the Community Multiscale Air Quality (CMAQ) model to simulate air quality during each of these 11-year periods. Read More

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https://www.atmos-chem-phys.net/18/15471/2018/
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http://dx.doi.org/10.5194/acp-18-15471-2018DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6453137PMC
January 2018
27 Reads

Two-scale multi-model ensemble: is a hybrid ensemble of opportunity telling us more?

Atmos Chem Phys 2018 ;18:2727-2744

Eurasia Institute of Earth Sciences, Istanbul Technical University, Istanbul, Turkey.

In this study we introduce a consisting of air quality models operating at both the global and regional scale. The work is motivated by the fact that these different types of models treat specific portions of the atmospheric spectrum with different levels of detail, and it is hypothesized that their combination can generate an ensemble that performs better than mono-scale ensembles. A detailed analysis of the hybrid ensemble is carried out in the attempt to investigate this hypothesis and determine the real benefit it produces compared to ensembles constructed from only global-scale or only regional-scale models. Read More

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https://www.atmos-chem-phys.net/18/8727/2018/
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http://dx.doi.org/10.5194/acp-18-8727-2018DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6452644PMC
January 2018
22 Reads

Long-term trends in the ambient PM- and O-related mortality burdens in the United States under emission reductions from 1990 to 2010.

Atmos Chem Phys 2018 ;18(20):15003-15016

Computational Exposure Division, National Exposure Research Laboratory, Office of Research and Development, US Environmental Protection Agency, Research Triangle Park, NC 27711, USA.

Concentrations of both fine particulate matter (PM) and ozone (O) in the United States (US) have decreased significantly since 1990, mainly because of air quality regulations. Exposure to these air pollutants is associated with premature death. Here we quantify the annual mortality burdens from PM and O in the US from 1990 to 2010, estimate trends and inter-annual variability, and evaluate the contributions to those trends from changes in pollutant concentrations, population, and baseline mortality rates. Read More

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http://dx.doi.org/10.5194/acp-18-15003-2018DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6436631PMC
January 2018
1 Read

Experimental and model estimates of the contributions from biogenic monoterpenes and sesquiterpenes to secondary organic aerosol in the southeastern United States.

Atmos Chem Phys 2018 31;18(17):12613-12637. Epub 2018 Aug 31.

School of Chemical and Biomolecular Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA.

Atmospheric organic aerosol (OA) has important impacts on climate and human health but its sources remain poorly understood. Biogenic monoterpenes and sesquiterpenes are important precursors of secondary organic aerosol (SOA), but the amounts and pathways of SOA generation from these precursors are not well constrained by observations. We propose that the less-oxidized oxygenated organic aerosol (LO-OOA) factor resolved from positive matrix factorization (PMF) analysis on aerosol mass spectrometry (AMS) data can be used as a surrogate for fresh SOA from monoterpenes and sesquiterpenes in the southeastern US. Read More

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http://dx.doi.org/10.5194/acp-18-12613-2018DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6402345PMC
August 2018
2 Reads

Modeling the radiative effects of biomass burning aerosols on carbon fluxes in the Amazon region.

Atmos Chem Phys 2017 Dec 12;17(23):14785-14810. Epub 2017 Dec 12.

Centro de Ciências do Sistema Terrestre, Instituto Nacional de Pesquisas Espaciais (INPE), São José dos Campos, SP, Brazil.

Every year, a dense smoke haze covers a large portion of South America originating from fires in the Amazon Basin and central parts of Brazil during the dry biomass burning season between August and October. Over a large portion of South America, the average aerosol optical depth at 550 nm exceeds 1.0 during the fire season, while the background value during the rainy season is below 0. Read More

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http://dx.doi.org/10.5194/acp-17-14785-2017DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7346277PMC
December 2017

Observation- and Model-Based Estimates of Particulate Dry Nitrogen Deposition to the Oceans.

Atmos Chem Phys 2017 5;17(13):8189-8210. Epub 2017 Jul 5.

Rosenstiel School of Marine and Atmospheric Sciences, University of Miami, Miami, Florida, USA.

Anthropogenic nitrogen (N) emissions to the atmosphere have increased significantly the deposition of nitrate (NO) and ammonium (NH) to the surface waters of the open ocean, with potential impacts on marine productivity and the global carbon cycle. Global-scale understanding of the impacts of N deposition to the oceans is reliant on our ability to produce and validate models of nitrogen emission, atmospheric chemistry, transport and deposition. In this work, ~2900 observations of aerosol NO and NH concentrations, acquired from sampling aboard ships in the period 1995 - 2012, are used to assess the performance of modelled N concentration and deposition fields over the remote ocean. Read More

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http://dx.doi.org/10.5194/acp-17-8189-2017DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5685536PMC
July 2017
15 Reads

NO emission trends over Chinese cities estimated from OMI observations during 2005 to 2015.

Atmos Chem Phys 2017 1;17(15):9261-9275. Epub 2017 Aug 1.

Ministry of Education Key Laboratory for Earth System Modeling, Department of Earth System Science, Tsinghua University, Beijing, China.

Satellite NO observations have been widely used to evaluate emission changes. To determine trends in NO emission over China, we used a method independent of chemical transport models to quantify the NO emissions from 48 cities and 7 power plants over China, on the basis of Ozone Monitoring Instrument (OMI) NO observations during 2005 to 2015. We found that NO emissions over 48 Chinese cities increased by 52% from 2005 to 2011 and decreased by 21% from 2011 to 2015. Read More

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http://dx.doi.org/10.5194/acp-17-9261-2017DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5664226PMC
August 2017
7 Reads

Reanalysis comparisons of upper tropospheric/lower stratospheric jets and multiple tropopauses.

Atmos Chem Phys 2017 Sep 27;17(18):11541-11566. Epub 2017 Sep 27.

Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USA.

The representation of upper tropospheric/lower stratospheric (UTLS) jet and tropopause characteristics is compared in five modern high-resolution reanalyses for 1980 through 2014. Climatologies of upper tropospheric jet, subvortex jet (the lowermost part of the stratospheric vortex), and multiple tropopause frequency distributions in MERRA (Modern Era Retrospective Analysis for Research and Applications), ERA-I (the ECMWF interim reanalysis), JRA-55 (the Japanese 55-year Reanalysis), and CFSR (the Climate Forecast System Reanalysis) are compared with those in MERRA-2. Differences between alternate products from individual reanalysis systems are assessed; in particular, a comparison of CFSR data on model and pressure levels highlights the importance of vertical grid spacing. Read More

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http://dx.doi.org/10.5194/acp-17-11541-2017DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7323772PMC
September 2017

The spectral signature of cloud spatial structure in shortwave irradiance.

Atmos Chem Phys 2016 Nov 28;16(21):13791-13806. Epub 2016 Sep 28.

Laboratory for Atmospheric and Space Physics, University of Colorado, Boulder, CO, USA.

In this paper, we used cloud imagery from a NASA field experiment in conjunction with three-dimensional radiative transfer calculations to show that cloud spatial structure manifests itself as a spectral signature in shortwave irradiance fields - specifically in transmittance and net horizontal photon transport in the visible and near-ultraviolet wavelength range. We found a robust correlation between the magnitude of net horizontal photon transport () and its spectral dependence (slope), which is scale-invariant and holds for the entire pixel population of a domain. This was surprising at first given the large degree of spatial inhomogeneity. Read More

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http://dx.doi.org/10.5194/acp-16-13791-2016DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5562414PMC
November 2016
11 Reads

Comprehensive atmospheric modeling of reactive cyclic siloxanes and their oxidation products.

Atmos Chem Phys 2017 Jul 10;17(13):8357-8370. Epub 2017 Jul 10.

Department of Chemical and Biochemical Engineering, University of Iowa, Iowa City, IA 52242, USA.

Cyclic volatile methyl siloxanes (cVMSs) are important components in personal care products that transport and react in the atmosphere. Octamethylcyclotetrasiloxane (D), decamethylcyclopentasiloxane (D), dodecamethylcyclohexasiloxane (D), and their gas-phase oxidation products have been incorporated into the Community Multiscale Air Quality (CMAQ) model. Gas-phase oxidation products, as the precursor to secondary organic aerosol from this compound class, were included to quantify the maximum potential for aerosol formation from gas-phase reactions with OH. Read More

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http://dx.doi.org/10.5194/acp-17-8357-2017DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6368090PMC
July 2017
2 Reads

Chemical transport model simulations of organic aerosol in southern California: model evaluation and gasoline and diesel source contributions.

Atmos Chem Phys 2017 Mar;17(6):4305-4318

Mechanical Engineering, Carnegie Mellon University, Pittsburgh, PA 15213, USA.

Gasoline- and diesel-fueled engines are ubiquitous sources of air pollution in urban environments. They emit both primary particulate matter and precursor gases that react to form secondary particulate matter in the atmosphere. In this work, we updated the organic aerosol module and organic emissions inventory of a three-dimensional chemical transport model, the Community Multiscale Air Quality Model (CMAQ), using recent, experimentally derived inputs and parameterizations for mobile sources. Read More

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https://www.atmos-chem-phys.net/17/4305/2017/
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http://dx.doi.org/10.5194/acp-17-4305-2017DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6070158PMC
March 2017
10 Reads

Global O-CO Correlations in a Chemistry and Transport Model During July-August: Evaluation with TES Satellite Observations and Sensitivity to Input Meteorological Data and Emissions.

Atmos Chem Phys 2017 11;17(13):8429-8452. Epub 2017 Jul 11.

NASA Goddard Space Flight Center, Greenbelt, MD.

We examine the capability of the Global Modeling Initiative (GMI) chemistry and transport model to reproduce global mid-tropospheric (618hPa) O-CO correlations determined by the measurements from Tropospheric Emission Spectrometer (TES) aboard NASA's Aura satellite during boreal summer (July-August). The model is driven by three meteorological data sets (fvGCM with sea surface temperature for 1995, GEOS4-DAS for 2005, and MERRA for 2005), allowing us to examine the sensitivity of model O-CO correlations to input meteorological data. Model simulations of radionuclide tracers (Rn, Pb, and Be) are used to illustrate the differences in transport-related processes among the meteorological data sets. Read More

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http://dx.doi.org/10.5194/acp-17-8429-2017DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7250209PMC

Semivolatile POA and parameterized total combustion SOA in CMAQv5.2: impacts on source strength and partitioning.

Atmos Chem Phys 2017 ;17:11107-11133

National Exposure Research Laboratory, US Environmental Protection Agency, Research Triangle Park, NC, USA.

Mounting evidence from field and laboratory observations coupled with atmospheric model analyses shows that primary combustion emissions of organic compounds dynamically partition between the vapor and particulate phases, especially as near-source emissions dilute and cool to ambient conditions. The most recent version of the Community Multiscale Air Quality model version 5.2 (CMAQv5. Read More

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http://dx.doi.org/10.5194/acp-17-11107-2017DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7006837PMC
January 2017

Carbon dioxide and methane measurements from the Los Angeles Megacity Carbon Project - Part 1: calibration, urban enhancements, and uncertainty estimates.

Atmos Chem Phys 2017 ;17

NASA Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USA.

We report continuous surface observations of carbon dioxide (CO) and methane (CH) from the Los Angeles (LA) Megacity Carbon Project during 2015. We devised a calibration strategy, methods for selection of background air masses, calculation of urban enhancements, and a detailed algorithm for estimating uncertainties in urban-scale CO and CH measurements. These methods are essential for understanding carbon fluxes from the LA megacity and other complex urban environments globally. Read More

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http://dx.doi.org/10.5194/acp-17-8313-2017DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6459414PMC
January 2017
7 Reads

Assessing the impact of anthropogenic pollution on isoprene-derived secondary organic aerosol formation in PM collected from the Birmingham, Alabama, ground site during the 2013 Southern Oxidant and Aerosol Study.

Atmos Chem Phys 2017 ;16(0):4897-4914

Department of Environmental Sciences and Engineering, Gillings School of Global Public Health, The University of North Carolina at Chapel Hill, Chapel Hill, NC, USA.

In the southeastern US, substantial emissions of isoprene from deciduous trees undergo atmospheric oxidation to form secondary organic aerosol (SOA) that contributes to fine particulate matter (PM). Laboratory studies have revealed that anthropogenic pollutants, such as sulfur dioxide (SO), oxides of nitrogen (NO ), and aerosol acidity, can enhance SOA formation from the hydroxyl radical (OH)-initiated oxidation of isoprene; however, the mechanisms by which specific pollutants enhance isoprene SOA in ambient PM remain unclear. As one aspect of an investigation to examine how anthropogenic pollutants influence isoprene-derived SOA formation, high-volume PM filter samples were collected at the Birmingham, Alabama (BHM), ground site during the 2013 Southern Oxidant and Aerosol Study (SOAS). Read More

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http://dx.doi.org/10.5194/acp-16-4897-2016DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6145830PMC
January 2017
27 Reads

Evaluation and error apportionment of an ensemble of atmospheric chemistry transport modeling systems: multivariable temporal and spatial breakdown.

Atmos Chem Phys 2017 ;17(4):3001-3054

European Commission, Joint Research Centre (JRC), Directorate for Energy, Transport and Climate, Air and Climate Unit, Ispra (VA), Italy.

Through the comparison of several regional-scale chemistry transport modeling systems that simulate meteorology and air quality over the European and North American continents, this study aims at (i) apportioning error to the responsible processes using timescale analysis, (ii) helping to detect causes of model error, and (iii) identifying the processes and temporal scales most urgently requiring dedicated investigations. The analysis is conducted within the framework of the third phase of the Air Quality Model Evaluation International Initiative (AQMEII) and tackles model performance gauging through measurement-to-model comparison, error decomposition, and time series analysis of the models biases for several fields (ozone, CO, SO, NO, NO, PM, PM, wind speed, and temperature). The operational metrics (magnitude of the error, sign of the bias, associativity) provide an overallsense of model strengths and deficiencies, while apportioning the error to its constituent parts (bias, variance, and covariance) can help assess the nature and quality of the error. Read More

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https://www.atmos-chem-phys.net/17/3001/2017/
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http://dx.doi.org/10.5194/acp-17-3001-2017DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6105295PMC
January 2017
50 Reads