A 10-year (1997-2006) reanalysis of Quantitative Precipitation Estimation over France: methodology and first results

摘要

In order to provide a common reference for hydrologists (e.g. for calibrating model parameters, assessing the added value of inputting high space-time resolution data in hydrological models), Meteo France is currently running a national collaborative project aimed at producing a high-resolution (1 km~2), 10-year reference database (1997-2006) of hourly Quantitative Precipitation Estimations (QPE) covering the entire French metropolitan territory with no spatial nor temporal gaps. The input data that are used are the individual 5 min 512 × 512 km~2 pseudo-CAPPI radar reflectivity images of the French radar network and quality-controlled hourly and daily (from 6 UTC to 6 UTC) raingauges. Several validation exercises have been performed to validate the various steps of the processing chain. In particular, the final product - 1 km~2 composite hourly accumulation maps - has been evaluated with independent raingauge data over one year in two different geographical / meteorological contexts.