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Article Dans Une Revue Climate Dynamics Année : 2015

High-resolution rainfall variability simulated by the WRF RCM: application to eastern France.

Résumé

The Weather Research and Forecasting (WRF) model, driven laterally by ERA-Interim reanalyses, is used here to downscale rainfall, at relatively high resolution (*8 km) over Burgundy (eastern France), during the period 1989–2009. Regional simulations are compared to the Me´te´o-France Station Network (MFSN; 127 daily raingauge records), at various temporal scales, including interannual variability, the annual cycle, and weather types. Results show that the spatial distribution of WRF-simulated rainfall climatology is consistent with MFSN observation data, but WRF tends to overestimate annual rainfall by *?15 %. At the interannual scale, WRF also performs very well (r * 0.8), despite almost constant, systematic overestimation. Only the average annual rainfall cycle is not accurately reproduced by WRF (r * 0.5), with rainfall overestimation in spring and summer, when convective rainfall prevails. During the winter season (October– March), when stratiform rainfall is prevalent, WRF performs better. Despite the biases for summertime convective events, these results suggest that high-resolution WRF simulations could successfully be used to document present and future climate variability at a regional scale. Nevertheless, because of overestimated convective rainfall, WRF-simulated rainfall should probably not be used directly to feed impact models, especially during the vegetative summer period.
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Dates et versions

hal-01112751 , version 1 (03-02-2015)

Identifiants

Citer

Romain Marteau, Yves Richard, Benjamin Pohl, Carmela Chateau Smith, Thierry Castel. High-resolution rainfall variability simulated by the WRF RCM: application to eastern France.. Climate Dynamics, 2015, 44 (3-4), pp.1093-1107. ⟨10.1007/s00382-014-2125-5⟩. ⟨hal-01112751⟩
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