Reference : Brief communication: Evaluation of the near-surface climate in ERA5 over the Greenlan...
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Earth sciences & physical geography
http://hdl.handle.net/2268/245980
Brief communication: Evaluation of the near-surface climate in ERA5 over the Greenland Ice Sheet
English
[fr] Evaluation du climat de proche surface des ERA5 sur l'inlandsis du Groenland
Delhasse, Alison mailto [Université de Liège - ULiège > Département de géographie > Climatologie et Topoclimatologie >]
Kittel, Christoph mailto [Université de Liège - ULiège > Département de géographie > Climatologie et Topoclimatologie >]
Amory, Charles mailto [Université de Liège - ULiège > Département de géographie > Climatologie et Topoclimatologie >]
Hofer, Stefan []
van As, Dirk []
S. Fausto, Robert []
Fettweis, Xavier mailto [Université de Liège - ULiège > Département de géographie > Climatologie et Topoclimatologie >]
12-Mar-2020
The Cryosphere
Copernicus Group
14
957–965
Yes (verified by ORBi)
International
1994-0416
1994-0424
Germany
[en] Greenland ; Reanalyses ; Climate
[en] The ERA5 reanalysis, recently made available by the European Centre for Medium-Range Weather Forecasts (ECMWF), is a new reanalysis product at a high resolution replacing ERA-Interim and is considered to provide the best climate reanalysis over Greenland to date. However, so far little is known about the performance of ERA5 over the Greenland Ice Sheet (GrIS). In this study, we compare the near-surface climate from the new ERA5 reanalysis to ERAInterim, the Arctic System Reanalysis (ASR) as well as to a state-of-the-art polar regional climate model (MAR). The results show (1) that ERA5 does not outperform ERA-Interim significantly when compared with near-surface climate observations over GrIS, but ASR better models the near-surface temperature than both ERA reanalyses. (2) Polar regional climate models (e.g., MAR) are still a useful tool to downscale the GrIS climate compared to ERA5, as in particular the near-surface temperature in summer has a key role for representing snow and ice processes such as the surface melt. However, assimilating satellite data and using a more recent
radiative scheme enable both ERA and ASR reanalyses to represent more satisfactorily than MAR the downward solar and infrared fluxes. (3) MAR near-surface climate is not affected when forced at its lateral boundaries by either ERA5 or ERA-Interim. Therefore, forcing polar regional climate models with ERA5 starting from 1950 will enable long and homogeneous surface mass balance reconstructions.
F.R.S.-FNRS - Fonds de la Recherche Scientifique ; CECi - Consortium des Équipements de Calcul Intensif
Researchers ; Professionals ; Students
http://hdl.handle.net/2268/245980
10.5194/tc-14-957-2020
https://www.the-cryosphere.net/14/957/2020/

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