Article Dans Une Revue Climate Dynamics Année : 2024

The added value of simulated near-surface wind speed over the Alps from a km-scale multimodel ensemble

1 Faculdade de Ciências [Lisboa]
2 ICAM - Instituto de Ciencias Ambientales [Toledo]
3 Departamento de Física y Matematicas [Alcala]
4 Facultad de Ciencias Ambientales y Bioquímica [Toledo]
5 IBG - Institute of Bio- and Geosciences [Jülich]
6 NORCE - Norwegian Research Center
7 ICTP - Abdus Salam International Centre for Theoretical Physics [Trieste]
8 ACINN - Department of Atmospheric and Cryosphere Sciences [Innsbruck]
9 SMHI - Swedish Meteorological and Hydrological Institute
10 Department of Geophysics [Zagreb]
11 MOHC - Met Office Hadley Centre
12 CNRM - Centre national de recherches météorologiques
13 MET - Norwegian Meteorological Institute [Oslo]
14 CICERO - Center for International Climate and Environmental Research [Oslo]
15 Department of Meteorology and Climatology [Thessaloniki]
16 KNMI - Royal Netherlands Meteorological Institute
17 IFCA - Instituto de Física de Cantabria
18 IMK-TRO - Institut für Meteorologie und Klimaforschung - Troposphärenforschung
19 WEGC - Wegener Center for Climate and Global Change
20 Institut für Atmosphäre und Klima [Zürich]
21 Wyss Academy for Nature
22 CEP - Climate and Environmental Physics [Bern]
23 OCCR - Oeschger Centre for Climate Change Research
24 IPM - Institut für Physik und Meteorologie [Stuttgart]
25 BTU - Brandenburg University of Technology [Cottbus – Senftenberg]
26 CMCC - Fondazione Centro Euro-Mediterraneo sui Cambiamenti Climatici [Caserta]
27 CESR - Center for Environmental Systems Research [Kassel]
28 GERICS - Climate Service Center [Hambourg]
29 SPACE - LATMOS
Sophie Bastin

Résumé

The advancement of computational resources has allowed researchers to run convection-permitting regional climate model (CPRCM) simulations. A pioneering effort promoting a multimodel ensemble of such simulations is the CORDEX Flagship Pilot Studies (FPS) on “Convective Phenomena over Europe and the Mediterranean” over an extended Alps region. In this study, the Distribution Added Value metric is used to determine the improvement of the representation of all available FPS hindcast simulations for the daily mean near-surface wind speed. The analysis is performed on normalized empirical probability distributions and considers station observation data as the reference. The use of a normalized metric allows for spatial comparison among the different regions (coast and inland), altitudes and seasons. This approach permits a direct assessment of the added value between the CPRCM simulations against their global driving reanalysis (ERA-Interim) and respective coarser resolution regional model counterparts. In general, the results show that CPRCMs add value to their global driving reanalysis or forcing regional model, due to better-resolved topography or through better representation of ocean-land contrasts. However, the nature and magnitude of the improvement in the wind speed representation vary depending on the model, the season, the altitude, or the region. Among seasons, the improvement is usually larger in summer than winter. CPRCMs generally display gains at low and medium-range altitudes. In addition, despite some shortcomings in comparison to ERA-Interim, which can be attributed to the assimilation of wind observations on the coast, the CPRCMs outperform the coarser regional climate models, both along the coast and inland.

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Dates et versions

insu-04572841 , version 1 (12-05-2024)
insu-04572841 , version 2 (08-09-2024)

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M O Molina, J M Careto, C Gutiérrez, E Sánchez, K Goergen, et al.. The added value of simulated near-surface wind speed over the Alps from a km-scale multimodel ensemble. Climate Dynamics, 2024, 62, pp.4697-4715. ⟨10.1007/s00382-024-07257-4⟩. ⟨insu-04572841v2⟩
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