Verification of boundary layer wind patterns in COSMO-REA2 using clear-air radar echoes

<p>The verification of high-resolution meteorological models requires highly resolved validation data and appropriate tools of analysis. While much progress has been made in the case of precipitation, wind fields have received less attention, largely due to a lack of spatial measurements. Clea...

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Autores principales:	S. Buschow, P. Friederichs
Formato:	article
Lenguaje:	EN
Publicado:	Copernicus Publications 2021
Materias:	Geology QE1-996.5
Acceso en línea:	https://doaj.org/article/d5a947e37ab145b9ae1ac3c5633ee0b4
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spelling	oai:doaj.org-article:d5a947e37ab145b9ae1ac3c5633ee0b42021-11-05T12:37:26ZVerification of boundary layer wind patterns in COSMO-REA2 using clear-air radar echoes10.5194/gmd-14-6765-20211991-959X1991-9603https://doaj.org/article/d5a947e37ab145b9ae1ac3c5633ee0b42021-11-01T00:00:00Zhttps://gmd.copernicus.org/articles/14/6765/2021/gmd-14-6765-2021.pdfhttps://doaj.org/toc/1991-959Xhttps://doaj.org/toc/1991-9603<p>The verification of high-resolution meteorological models requires highly resolved validation data and appropriate tools of analysis. While much progress has been made in the case of precipitation, wind fields have received less attention, largely due to a lack of spatial measurements. Clear-sky radar echoes could be an unexpected part of the solution by affording us an indirect look at horizontal wind patterns: regions of horizontal convergence attract non-meteorological scatterers such as insects; their concentration visualizes the structure of the convergence field. Using a two-dimensional wavelet transform, this study demonstrates how divergences and reflectivities can be quantitatively compared in terms of their spatial scale, anisotropy (horizontal), and direction. A long-term validation of the highly resolved regional reanalysis COSMO-REA2 against the German radar mosaic shows surprisingly close agreement. Despite theoretically predicted problems with simulations in or near the “grey zone” of turbulence, COSMO-REA2 is shown to produce a realistic diurnal cycle of the spatial scales larger than 8 <span class="inline-formula">km</span>. In agreement with the literature, the orientation of the patterns in both datasets closely follows the mean wind direction. Conversely, an analysis of the horizontal anisotropy reveals that the model has an unrealistic tendency towards highly linear, roll-like patterns early in the day.</p>S. BuschowP. FriederichsCopernicus PublicationsarticleGeologyQE1-996.5ENGeoscientific Model Development, Vol 14, Pp 6765-6780 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Geology QE1-996.5
spellingShingle	Geology QE1-996.5 S. Buschow P. Friederichs Verification of boundary layer wind patterns in COSMO-REA2 using clear-air radar echoes
description	<p>The verification of high-resolution meteorological models requires highly resolved validation data and appropriate tools of analysis. While much progress has been made in the case of precipitation, wind fields have received less attention, largely due to a lack of spatial measurements. Clear-sky radar echoes could be an unexpected part of the solution by affording us an indirect look at horizontal wind patterns: regions of horizontal convergence attract non-meteorological scatterers such as insects; their concentration visualizes the structure of the convergence field. Using a two-dimensional wavelet transform, this study demonstrates how divergences and reflectivities can be quantitatively compared in terms of their spatial scale, anisotropy (horizontal), and direction. A long-term validation of the highly resolved regional reanalysis COSMO-REA2 against the German radar mosaic shows surprisingly close agreement. Despite theoretically predicted problems with simulations in or near the “grey zone” of turbulence, COSMO-REA2 is shown to produce a realistic diurnal cycle of the spatial scales larger than 8 <span class="inline-formula">km</span>. In agreement with the literature, the orientation of the patterns in both datasets closely follows the mean wind direction. Conversely, an analysis of the horizontal anisotropy reveals that the model has an unrealistic tendency towards highly linear, roll-like patterns early in the day.</p>
format	article
author	S. Buschow P. Friederichs
author_facet	S. Buschow P. Friederichs
author_sort	S. Buschow
title	Verification of boundary layer wind patterns in COSMO-REA2 using clear-air radar echoes
title_short	Verification of boundary layer wind patterns in COSMO-REA2 using clear-air radar echoes
title_full	Verification of boundary layer wind patterns in COSMO-REA2 using clear-air radar echoes
title_fullStr	Verification of boundary layer wind patterns in COSMO-REA2 using clear-air radar echoes
title_full_unstemmed	Verification of boundary layer wind patterns in COSMO-REA2 using clear-air radar echoes
title_sort	verification of boundary layer wind patterns in cosmo-rea2 using clear-air radar echoes
publisher	Copernicus Publications
publishDate	2021
url	https://doaj.org/article/d5a947e37ab145b9ae1ac3c5633ee0b4
work_keys_str_mv	AT sbuschow verificationofboundarylayerwindpatternsincosmorea2usingclearairradarechoes AT pfriederichs verificationofboundarylayerwindpatternsincosmorea2usingclearairradarechoes
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Verification of boundary layer wind patterns in COSMO-REA2 using clear-air radar echoes

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