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Atmosphere 2016, 7(6), 82; doi:10.3390/atmos7060082

Validation of ERA-Interim Precipitation Estimates over the Baltic Sea

GEOMAR Helmholtz Centre for Ocean Research Kiel, Düsternbrooker Weg 20, Kiel 24105, Germany
Academic Editor: Katja Friedrich
Received: 20 May 2016 / Revised: 3 June 2016 / Accepted: 7 June 2016 / Published: 11 June 2016
(This article belongs to the Special Issue Advances in Clouds and Precipitation)
View Full-Text   |   Download PDF [3770 KB, uploaded 11 June 2016]   |  

Abstract

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. View Full-Text
Keywords: precipitation; Baltic Sea; ERA-Interim; evaporation; ship rain gauge precipitation; Baltic Sea; ERA-Interim; evaporation; ship rain gauge
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Bumke, K. Validation of ERA-Interim Precipitation Estimates over the Baltic Sea. Atmosphere 2016, 7, 82.

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