7 results match your criteria Boundary-layer Meteorology[Journal]

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Hybrid Profile-Gradient Approaches for the Estimation of Surface Fluxes.

Authors:
Sukanta Basu

Boundary Layer Meteorol 2019 24;170(1):29-44. Epub 2018 Sep 24.

Faculty of Civil Engineering and Geosciences, Delft University of Technology, Delft, The Netherlands.

The Monin-Obukhov similarity theory-based wind speed and potential temperature profiles are inherently coupled to each other. We have developed hybrid approaches to disentangle them, and as a direct consequence, the estimation of Obukhov length (and associated turbulent fluxes) from either wind-speed or temperature measurements becomes an effortless task. Additionally, our approaches give rise to two easily measurable indices of atmospheric stability. Read More

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http://dx.doi.org/10.1007/s10546-018-0391-1DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6383842PMC
September 2018

Understanding and Reducing False Alarms in Observational Fog Prediction.

Boundary Layer Meteorol 2018 3;169(2):347-372. Epub 2018 Jul 3.

2Royal Netherlands Meteorological Institute (KNMI), De Bilt, The Netherlands.

The reduction in visibility that accompanies fog events presents a hazard to human safety and navigation. However, accurate fog prediction remains elusive, with numerical methods often unable to capture the conditions of fog formation, and observational methods having high false-alarm rates in order to obtain high hit rates of prediction. In this work, 5 years of observations from the Cabauw Experimental Site for Atmospheric Research are used to further investigate how false alarms may be reduced using the statistical method for diagnosing radiation-fog events from observations developed by Menut et al. Read More

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http://dx.doi.org/10.1007/s10546-018-0374-2DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6208920PMC
July 2018
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Scalar-Flux Similarity in the Layer Near the Surface Over Mountainous Terrain.

Boundary Layer Meteorol 2018 14;169(1):11-46. Epub 2018 Jun 14.

1Department of Atmospheric and Cryospheric Sciences, University of Innsbruck, Innrain 52f, 6020 Innsbruck, Austria.

The scaled standard deviations of temperature and humidity are investigated in complex terrain. The study area is a steep Alpine valley, with six measurement sites of different slope, orientation and roughness (i-Box experimental site, Inn Valley, Austria). Examined here are several assumptions forming the basis of Monin-Obukhov similarity theory (MOST), including constant turbulence fluxes with height and the degree of self-correlation between the involved turbulence variables. Read More

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http://dx.doi.org/10.1007/s10546-018-0365-3DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6191036PMC

From Near-Neutral to Strongly Stratified: Adequately Modelling the Clear-Sky Nocturnal Boundary Layer at Cabauw.

Boundary Layer Meteorol 2018 7;166(2):217-238. Epub 2017 Oct 7.

2R&D Observations and Data Technology, Royal Netherlands Meteorological Institute, PO-Box 201, De Bilt, The Netherlands.

The performance of an atmospheric single-column model (SCM) is studied systematically for stably-stratified conditions. To this end, 11 years (2005-2015) of daily SCM simulations were compared to observations from the Cabauw observatory, The Netherlands. Each individual clear-sky night was classified in terms of the ambient geostrophic wind speed with a [Formula: see text] bin-width. Read More

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http://dx.doi.org/10.1007/s10546-017-0304-8DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC5775450PMC
October 2017
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Effects of a Fence on Pollutant Dispersion in a Boundary Layer Exposed to a Rural-to-Urban Transition.

Boundary Layer Meteorol 2018 3;169(2):185-208. Epub 2018 Jul 3.

1Laboratory for Aero and Hydrodynamics, Department Process and Energy, Delft University, Leeghwaterstraat 21, 2628 CA Delft, The Netherlands.

Simultaneous particle-image velocimetry and laser-induced fluorescence combined with large-eddy simulations are used to investigate the flow and pollutant dispersion behaviour in a rural-to-urban roughness transition. The urban roughness is characterized by an array of cubical obstacles in an aligned arrangement. A plane fence is added one obstacle height upstream of the urban roughness elements, with three different fence heights considered. Read More

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http://dx.doi.org/10.1007/s10546-018-0367-1DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6413630PMC
July 2018
3 Reads

A Mesoscale Model-Based Climatography of Nocturnal Boundary-Layer Characteristics over the Complex Terrain of North-Western Utah.

Boundary Layer Meteorol 2016;159:495-519. Epub 2015 May 30.

National Center for Atmospheric Research, Boulder, CO USA.

Nocturnal boundary-layer phenomena in regions of complex topography are extremely diverse and respond to a multiplicity of forcing factors, acting primarily at the mesoscale and microscale. The interaction between different physical processes, e.g. Read More

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http://dx.doi.org/10.1007/s10546-015-0044-6DOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4948760PMC

Eddy covariance measurements of carbon dioxide, latent and sensible energy fluxes above a meadow on a mountain slope.

Boundary Layer Meteorol 2007 Feb;122(2):397-416

Institut für Ökologie, Universität Innsbruck, Sternwartestr. 15, 6020 Innsbruck, Austria.

Carbon dioxide, latent and sensible energy fluxes were measured by means of the eddy covariance method above a mountain meadow situated on a steep slope in the Stubai Valley/Austria, based on the hypothesis that, due to the low canopy height, measurements can be made in the shallow equilibrium layer where the wind field exhibits characteristics akin to level terrain. In order to test the validity of this hypothesis and to identify effects of complex terrain in the turbulence measurements, data were subjected to a rigorous testing procedure using a series of quality control measures established for surface layer flows. The resulting high-quality data set comprised 36 % of the original observations, the substantial reduction being mainly due to a change in surface roughness and associated fetch limitations in the wind sector dominating during nighttime and transition periods. Read More

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http://dx.doi.org/10.1007/s10546-006-9109-xDOI Listing
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3898019PMC
February 2007
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