The representation of the trade winds in ECMWF forecasts and reanalyses during EUREC<sup>4</sup>A
Abstract 4 A field campaign provides an unprecedented wealth of measurements. We analyze the wind bias in the IFS and ERA5 reanalysis throughout the entire lower troposphere during EUREC4 A. The wind bias varies greatly from day to day, resulting in root mean square errors (RMSEs) up to 2.5 m s- 1 - - 1 - - 1 in reanalyses. These biases are insensitive to the assimilation of sondes. The modeled zonal and meridional winds exhibit a diurnal cycle that is too strong, leading to a weak wind speed bias everywhere up to 5 km during daytime but a wind speed bias below 2 km at nighttime that is too strong. Removing momentum transport by shallow convection reduces the wind bias near the surface but leads to stronger easterly near cloud base. The update in moist physics in the newest IFS cycle (cycle 47r3) reduces the meridional wind bias, especially during daytime. Below 1 km, modeled friction due to unresolved physical processes appears to be too strong but is (partially) compensated for by the dynamics, making this a challenging coupled problem.
- Location
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Deutsche Nationalbibliothek Frankfurt am Main
- Extent
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Online-Ressource
- Language
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Englisch
- Bibliographic citation
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The representation of the trade winds in ECMWF forecasts and reanalyses during EUREC4A ; volume:22 ; number:19 ; year:2022 ; pages:13049-13066 ; extent:18
Atmospheric chemistry and physics ; 22, Heft 19 (2022), 13049-13066 (gesamt 18)
- Creator
- DOI
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10.5194/acp-22-13049-2022
- URN
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urn:nbn:de:101:1-2022101305183578404947
- Rights
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Open Access; Der Zugriff auf das Objekt ist unbeschränkt möglich.
- Last update
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15.08.2025, 7:39 AM CEST
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Associated
- Savazzi, Alessandro Carlo Maria
- Nuijens, Louise
- Sandu, Irina
- George, Geet
- Bechtold, Peter
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