Articles | Volume 22, issue 19
https://doi.org/10.5194/acp-22-13049-2022
https://doi.org/10.5194/acp-22-13049-2022
Research article
 | 
11 Oct 2022
Research article |  | 11 Oct 2022

The representation of the trade winds in ECMWF forecasts and reanalyses during EUREC4A

Alessandro Carlo Maria Savazzi, Louise Nuijens, Irina Sandu, Geet George, and Peter Bechtold

Data sets

ERA5 hourly data on pressure levels from 1959 to present H. Hersbach, B. Bell, P. Berrisford, G. Biavati, A. Horányi, J. Muñoz Sabater, J. Nicolas, C. Peubey, R. Radu, I. Rozum, D. Schepers, A. Simmons, C. Soci, D. Dee, and J.-N. Thépaut https://doi.org/10.24381/cds.bd0915c6

JOANNE: Joint dropsonde Observations of the Atmosphere in tropical North atlaNtic meso-scale Environments G. George, B. Stevens, S. Bony, R. Pincus, C. Fairall, H. Schulz, T. Kölling, T. Q. T. Kalen, M. Klingebiel, H. Konow, A. Lundry, M. Prange, and J. Radtke https://doi.org/10.25326/221

Radiosonde measurements from the EUREC4A field campaign C. Stephan, S. Schnitt, H. Schulz, and H. Bellenger https://doi.org/10.25326/62

WindCube lidar measurements during EUREC4A L. Nuijens https://cloudbrake.citg.tudelft.nl/thredds/catalog/opendap/Savazzietal-ACP-2022/data/windlidars/catalog.html

Reference analysis experiment with ECMWF IFS for the EUREC4A period at 25 km resolution ECMWF https://doi.org/10.21957/4vgx-3f28

Control forecast experiment with ECMWF IFS for the EUREC4A period (25 km) ECMWF https://doi.org/10.21957/240p-1k07

Analysis experiment with ECMWF IFS for EUREC4A at 25 km resolution, without assimilating dropsondes ECMWF https://doi.org/10.21957/zfxz-3h02

Forecast experiment with ECMWF IFS for the EUREC4A period (25 km), no dropsondes ECMWF https://doi.org/10.21957/nv0f-pr71

Analysis with ECMWF IFS for EUREC4A (at 25 km), without assimilating dropsondes and radiosondes ECMWF https://doi.org/10.21957/7zx9-6084

Forecast experiment with ECMWF IFS for the EUREC4A period (25 km), no dropsondes and no radiosondes ECMWF https://doi.org/10.21957/mgrt-pp74

Analysis with ECMWF IFS for EUREC4A (at 25 km), without shallow convection momentum transport ECMWF https://doi.org/10.21957/2t2w-wy02

Forecast with ECMWF IFS for the EUREC4A period (25 km), no shallow convection momentum transport ECMWF https://doi.org/10.21957/af7h-bf97

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Short summary
Winds are of great importance for the transport of energy and moisture in the atmosphere. In this study we use measurements from the EUREC4A field campaign and several model experiments to understand the wind bias in the forecasts produced by the European Centre for Medium-Range Weather Forecasts. We are able to link the model errors to heights above 2 km and to the representation of the diurnal cycle of winds: the model makes the winds too slow in the morning and too strong in the evening.
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