21 results match your criteria Atmospheric Measurement Techniques[Journal]

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Assessing snow extent data sets over North America to inform and improve trace gas retrievals from solar backscatter.

Atmos Meas Tech 2018 22;11(5):2983-2994. Epub 2018 May 22.

Air Quality Research Division, Environment and Climate Change Canada, Toronto, Ontario, Canada.

Accurate representation of surface reflectivity is essential to tropospheric trace gas retrievals from solar backscatter observations. Surface snow cover presents a significant challenge due to its variability and thus snow-covered scenes are often omitted from retrieval data sets; however, the high reflectance of snow is potentially advantageous for trace gas retrievals. We first examine the implications of surface snow on retrievals from the upcoming TEMPO geostationary instrument for North America. Read More

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http://dx.doi.org/10.5194/amt-11-2983-2018DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6235450PMC

Chromatography related performance of the Monitor for AeRosols and GAses in ambient air (MARGA): laboratory and field-based evaluation.

Atmos Meas Tech 2017 Oct;10(10):3893-3908

National Risk Management Research Laboratory, Office of Research and Development, US Environmental Protection Agency, Research Triangle Park, North Carolina, 27711, USA.

Evaluation of the semi-continuous Monitor for AeRosols and GAses in ambient air (MARGA, Metrohm Ap-plikon B.V.) was conducted with an emphasis on examination of accuracy and precision associated with processing of chromatograms. Read More

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http://dx.doi.org/10.5194/amt-10-3893-2017DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6192433PMC
October 2017
2 Reads

A Cloud-Ozone Data Product from Aura OMI and MLS Satellite Measurements.

Atmos Meas Tech 2017 1;10(11):4067-4078. Epub 2017 Nov 1.

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

Ozone within deep convective clouds is controlled by several factors involving photochemical reactions and transport. Gas-phase photochemical reactions and heterogeneous surface chemical reactions involving ice, water particles, and aerosols inside the clouds all contribute to the distribution and net production and loss of ozone. Ozone in clouds is also dependent on convective transport that carries low troposphere/boundary layer ozone and ozone precursors upward into the clouds. Read More

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http://dx.doi.org/10.5194/amt-10-4067-2017DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5810404PMC
November 2017
5 Reads

Intercomparison of Open-Path Trace Gas Measurements with Two Dual Frequency Comb Spectrometers.

Atmos Meas Tech 2017 11;10(9):3295-3311. Epub 2017 Sep 11.

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

We present the first quantitative intercomparison between two open-path dual comb spectroscopy (DCS) instruments which were operated across adjacent 2-km open-air paths over a two-week period. We used DCS to measure the atmospheric absorption spectrum in the near infrared from 6021 to 6388 cm (1565 to 1661 nm), corresponding to a 367 cm bandwidth, at 0.0067 cm sample spacing. Read More

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http://dx.doi.org/10.5194/amt-2017-62DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5740489PMC
September 2017
13 Reads

An online monitor of the oxidative capacity of aerosols (o-MOCA).

Atmos Meas Tech 2017 28;10(2):633-644. Epub 2017 Feb 28.

Aerosol Dynamics Inc., 935 Grayson St., Berkeley, CA, USA.

The capacity of airborne particulate matter to generate reactive oxygen species (ROS) has been correlated with the generation of oxidative stress both in vitro and in vivo. The cellular damage from oxidative stress, and by implication with ROS, is associated with several common diseases, such as asthma and chronic obstructive pulmonary disease (COPD), and some neurological diseases. Yet currently available chemical and in vitro assays to determine the oxidative capacity of ambient particles require large samples, analyses are typically done offline, and the results are not immediate. Read More

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http://dx.doi.org/10.5194/amt-10-633-2017DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5703220PMC
February 2017
2 Reads

Differences in liquid cloud droplet effective radius and number concentration estimates between MODIS Collections 5.1 and 6 over global oceans.

Atmos Meas Tech 2017 8;10(6):2105-2116. Epub 2017 Jun 8.

NASA Goddard Space Flight Center, Greenbelt, Maryland, 20771, USA.

Differences in cloud droplet effective radius and cloud droplet number concentration (CDNC) estimates inferred from the Aqua MODIS Collections 5.1 and 6 cloud products (MYD06) are examined for warm clouds over global oceans for the year 2008. Individual pixel level retrievals for both collections are aggregated to 1° × 1° and compared globally and regionally for the three main spectral channel pairs used for MODIS cloud optical property retrievals. Read More

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http://dx.doi.org/10.5194/amt-10-2105-2017DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5662204PMC

Eddy covariance carbonyl sulphide flux measurements with a quantum cascade laser absorption spectrometer.

Atmos Meas Tech 2017 Sep;10(9):3525-3537

Institut of Ecology, University of Innsbruck, Innsbruck, Austria.

The trace gas carbonyl sulphide (COS) has lately received growing interest in the eddy covariance (EC) community due to its potential to serve as an independent approach for constraining gross primary production and canopy stomatal conductance. Thanks to recent developments of fast-response high-precision trace gas analysers (e.g. Read More

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http://dx.doi.org/10.5194/amt-10-3525-2017DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5662146PMC
September 2017
1 Read

Recent divergences in stratospheric water vapor measurements by frost point hygrometers and the Aura Microwave Limb Sounder.

Atmos Meas Tech 2016 Sep;9(9):4447-4457

Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, Colorado, USA.

Balloon-borne frost point hygrometers (FPs) and the Aura Microwave Limb Sounder (MLS) provide high-quality vertical profile measurements of water vapor in the upper troposphere and lower stratosphere (UTLS). A previous comparison of stratospheric water vapor measurements by FPs and MLS over three sites - Boulder, Colorado (40.0° N); Hilo, Hawaii (19. Read More

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http://dx.doi.org/10.5194/amt-9-4447-2016DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5619251PMC
September 2016
8 Reads

Cross-calibration of S-NPP VIIRS moderate resolution reflective solar bands against MODIS Aqua over dark water scenes.

Atmos Meas Tech 2017 13;10(4):1425-1444. Epub 2017 Apr 13.

Space Science and Engineering Center, University of Wisconsin, Madison, WI, USA.

The Visible Infrared Imaging Radiometer Suite (VIIRS) is being used to continue the record of Earth Science observations and data products produced routinely from National Aeronautics and Space Administration (NASA) Moderate Resolution Imaging Spectroradiometer (MODIS) measurements. However, the absolute calibration of VIIRS's reflected solar bands is thought to be biased, leading to offsets in derived data products such as aerosol optical depth (AOD) as compared to when similar algorithms are applied to different sensors. This study presents a cross-calibration of these VIIRS bands against MODIS Aqua over dark water scenes, finding corrections to the NASA VIIRS Level 1 (version 2) reflectances between approximately +1 % and -7 % (dependent on band) are needed to bring the two into alignment (after accounting for expected differences resulting from different band spectral response functions), and indications of relative trending of up to ^0. Read More

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http://dx.doi.org/10.5194/amt-10-1425-2017DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6155460PMC

Assessment of Mixed-Layer Height Estimation from Single-wavelength Ceilometer Profiles.

Atmos Meas Tech 2017 ;10:3963-3983

NASA Langley Research Center, Hampton, Virginia 23681, USA.

Differing boundary/mixed-layer height measurement methods were assessed in moderately-polluted and clean environments, with a focus on the Vaisala CL51 ceilometer. This intercomparison was performed as part of ongoing measurements at the Chemistry And Physics of the Atmospheric Boundary Layer Experiment (CAPABLE) site in Hampton, Virginia and during the 2014 Deriving Information on Surface Conditions from Column and Vertically Resolved Observations Relevant to Air Quality (DISCOVER-AQ) field campaign that took place in and around Denver, Colorado. We analyzed CL51 data that were collected via two different methods (BLView software, which applied correction factors, and simple terminal emulation logging) to determine the impact of data collection methodology. Read More

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http://dx.doi.org/10.5194/amt-10-3963-2017DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5906814PMC
January 2017
4 Reads

In-flight performance of the Ozone Monitoring Instrument.

Atmos Meas Tech 2017 1;10(5):1957-1986. Epub 2017 Jun 1.

Royal Netherlands Meteorological Institute KNMI, De Bilt, The Netherlands.

The Dutch-Finnish Ozone Monitoring Instrument (OMI) is an imaging spectrograph flying on NASA's EOS Aura satellite since July 15, 2004. OMI is primarily used to map trace gas concentrations in the Earth's atmosphere, obtaining mid-resolution (0.4-0. Read More

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http://dx.doi.org/10.5194/amt-2016-420DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5893161PMC
June 2017
1 Read

The detection of carbon dioxide leaks using quasi-tomographic laser absorption spectroscopy measurements in variable wind.

Atmos Meas Tech 2016 Apr;9:1627-1636

Atmospheric and Environmental Research, 131 Hartwell Avenue, Lexington, Massachusetts, 02421, USA.

Laser absorption spectroscopy (LAS) has been used over the last several decades for the measurement of trace gasses in the atmosphere. For over a decade, LAS measurements from multiple sources and tens of retroreflectors have been combined with sparse-sample tomography methods to estimate the 2-D distribution of trace gas concentrations and underlying fluxes from point-like sources. In this work, we consider the ability of such a system to detect and estimate the position and rate of a single point leak which may arise as a failure mode for carbon dioxide storage. Read More

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http://dx.doi.org/10.5194/amt-9-1627-2016DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4955779PMC
April 2016
4 Reads

Ground-based assessment of the bias and long-term stability of fourteen limb and occultation ozone profile data records.

Atmos Meas Tech 2016 8;9(6):2497-2534. Epub 2016 Jun 8.

NASA Langley Research Center, Hampton, VA, USA.

The ozone profile records of a large number of limb and occultation satellite instruments are widely used to address several key questions in ozone research. Further progress in some domains depends on a more detailed understanding of these data sets, especially of their long-term stability and their mutual consistency. To this end, we made a systematic assessment of fourteen limb and occultation sounders that, together, provide more than three decades of global ozone profile measurements. Read More

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http://dx.doi.org/10.5194/amtd-8-6661-2015DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5937289PMC

Investigation of a potential HCHO measurement artifact from ISOPOOH.

Atmos Meas Tech 2016 16;9(9):4561-4568. Epub 2016 Sep 16.

Atmospheric Chemistry and Dynamics Laboratory, NASA Goddard Space Flight Center, Greenbelt, MD, 20771, USA.

Recent laboratory experiments have shown that a first generation isoprene oxidation product, ISOPOOH, can decompose to methyl vinyl ketone (MVK) and methacrolein (MACR) on instrument surfaces, leading to overestimates of MVK and MACR concentrations. Formaldehyde (HCHO) was suggested as a decomposition co-product, raising concern that in situ HCHO measurements may also be affected by an ISOPOOH interference. The HCHO measurement artifact from ISOPOOH for the NASA In Situ Airborne Formaldehyde instrument (ISAF) was investigated for the two major ISOPOOH isomers, (1,2)-ISOPOOH and (4,3)-ISOPOOH, under dry and humid conditions. Read More

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http://dx.doi.org/10.5194/amt-9-4561-2016DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5889939PMC
September 2016
3 Reads

Instrumentation and Measurement Strategy for the NOAA SENEX Aircraft Campaign as Part of the Southeast Atmosphere Study 2013.

Atmos Meas Tech 2016 18;9(7):3063-3093. Epub 2016 Jul 18.

Department of Chemistry, Hendrix College, 1600 Washington Ave., Conway, AR, USA.

Natural emissions of ozone-and-aerosol-precursor gases such as isoprene and monoterpenes are high in the southeast of the US. In addition, anthropogenic emissions are significant in the Southeast US and summertime photochemistry is rapid. The NOAA-led SENEX (Southeast Nexus) aircraft campaign was one of the major components of the Southeast Atmosphere Study (SAS) and was focused on studying the interactions between biogenic and anthropogenic emissions to form secondary pollutants. Read More

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http://dx.doi.org/10.5194/amt-9-3063-2016DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5880326PMC

Uncertainties in cloud phase and optical thickness retrievals from the Earth Polychromatic Imaging Camera (EPIC).

Atmos Meas Tech 2016 26;9(4):1785-1797. Epub 2016 Apr 26.

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

This paper presents an investigation of the expected uncertainties of a single channel cloud optical thickness (COT) retrieval technique, as well as a simple cloud temperature threshold based thermodynamic phase approach, in support of the Deep Space Climate Observatory (DSCOVR) mission. DSCOVR cloud products will be derived from Earth Polychromatic Imaging Camera (EPIC) observations in the ultraviolet and visible spectra. Since EPIC is not equipped with a spectral channel in the shortwave or mid-wave infrared that is sensitive to cloud effective radius (CER), COT will be inferred from a single visible channel with the assumption of appropriate CER values for liquid and ice phase clouds. Read More

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http://dx.doi.org/10.5194/amt-9-1785-2016DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5880043PMC

Cirrus cloud optical and microphysical property retrievals from eMAS during SEACRS using bi-spectral reflectance measurements within the 1.88 μm water vapor absorption band.

Atmos Meas Tech 2016 20;9(4):1743-1753. Epub 2016 Apr 20.

Earth System Science Interdisciplinary Center, University of Maryland - College Park, College Park, Maryland, USA.

Previous bi-spectral imager retrievals of cloud optical thickness (COT) and effective particle radius (CER) based on the Nakajima and King (1990) approach, such as those of the operational MODIS cloud optical property retrieval product (MOD06), have typically paired a non-absorbing visible or near-infrared wavelength, sensitive to COT, with an absorbing shortwave or midwave infrared wavelength sensitive to CER. However, in practice it is only necessary to select two spectral channels that exhibit a strong contrast in cloud particle absorption. Here it is shown, using eMAS observations obtained during NASA's SEACRS field campaign, that selecting two absorbing wavelength channels within the broader 1. Read More

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http://dx.doi.org/10.5194/amt-9-1743-2016DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5880280PMC

Controlled weather balloon ascents and descents for atmospheric research and climate monitoring.

Atmos Meas Tech 2016 7;9:929-938. Epub 2016 Mar 7.

Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, Colorado 80309, USA.

In situ upper-air measurements are often made with instruments attached to weather balloons launched at the surface and lifted into the stratosphere. Present-day balloon-borne sensors allow near-continuous measurements from the Earth's surface to about 35 km (3-5 hPa), where the balloons burst and their instrument payloads descend with parachutes. It has been demonstrated that ascending weather balloons can perturb the air measured by very sensitive humidity and temperature sensors trailing behind them, particularly in the upper troposphere and lower stratosphere (UTLS). Read More

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https://www.atmos-meas-tech.net/9/929/2016/
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http://dx.doi.org/10.5194/amt-9-929-2016DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5734649PMC
March 2016
1 Read

UTLS water vapour from SCIAMACHY limb measurementsV3.01 (2002-2012).

Atmos Meas Tech 2016 18;9:133-158. Epub 2016 Jan 18.

Institute of Environmental Physics - IUP, University of Bremen, Bremen, Germany.

The SCanning Imaging Absorption spectroMeter for Atmospheric CHartographY (SCIAMACHY) aboard the Envisat satellite provided measurements from August 2002 until April 2012. SCIAMACHY measured the scattered or direct sunlight using different observation geometries. The limb viewing geometry allows the retrieval of water vapour at about 10-25 km height from the near-infrared spectral range (1353-1410 nm). Read More

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http://dx.doi.org/10.5194/amt-9-133-2016DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5734655PMC
January 2016

Advancements, measurement uncertainties, and recent comparisons of the NOAA frost point hygrometer.

Atmos Meas Tech 2016 5;9(9):4295-4310. Epub 2016 Sep 5.

Physikalisch-Technische Bundesanstalt, Braunschweig, Germany.

The NOAA frost point hygrometer (FPH) is a balloon-borne instrument flown monthly at three sites to measure water vapor profiles up to 28 km. The FPH record from Boulder, Colorado, is the longest continuous stratospheric water vapor record. The instrument has an uncertainty in the stratosphere that is < 6 % and up to 12 % in the troposphere. Read More

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http://dx.doi.org/10.5194/amt-9-4295-2016DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5571835PMC
September 2016
1 Read

First eddy covariance flux measurements by PTR-TOF.

Atmos Meas Tech 2010 Mar;3(2):387-395

Institut für Ionenphysik und Angewandte Physik, Universität Innsbruck, Innsbruck, Austria.

The recently developed PTR-TOF instrument was evaluated to measure methanol fluxes emitted from grass land using the eddy covariance method. The high time resolution of the PTR-TOF allowed storing full mass spectra up to 315 with a frequency of 10 Hz. Three isobaric ions were found at a nominal mass of 33 due to the high mass resolving power of the PTR-TOF. Read More

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http://dx.doi.org/10.5194/amt-3-387-2010DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3898015PMC
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