Validation of ERA-Interim Precipitation Estimates over the Baltic Sea

Bumke, Karl (2016) Validation of ERA-Interim Precipitation Estimates over the Baltic Sea Atmosphere, 7 (6). p. 82. DOI 10.3390/atmos7060082.

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European Centre for Medium-Range Weather Forecasts (ECMWF) ERA-Interim reanalysis total precipitation estimates are validated against ten years of in situ precipitation measurements onboard of ships over the Baltic Sea. A statistical analysis for binary forecasts and mean rain rates derived from all data show a good agreement with observations. However, a closer look reveals an underestimation of ERA-Interim total precipitation in spring and an overestimation in autumn, obviously related to stability. Deriving stability and evaporation by a bulk flux scheme it could be shown, in fact, that ERA-Interim underestimates precipitation for conditions with low evaporation and strongly overestimates it for conditions with high evaporation. Since ERA-Interim surface fields become too dry with increasing evaporation compared to independent synoptic ship observations, uncertainties in the ECMWF convection scheme may possibly cause these biases in seasonal precipitation.

Document Type: Article
Additional Information: WOS:000378818400009
Keywords: precipitation; Baltic Sea; ERA-Interim; evaporation; ship rain gauge; R.V. Heincke: HE113-115 (1998); R.V. ALKOR; AL60-226
Research affiliation: OceanRep > GEOMAR > FB1 Ocean Circulation and Climate Dynamics > FB1-ME Maritime Meteorology
Refereed: Yes
DOI etc.: 10.3390/atmos7060082
ISSN: 2073-4433
Date Deposited: 14 Jun 2016 10:04
Last Modified: 04 May 2017 11:26

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