Evaluation of Global Satellite Mapping of precipitation analysis product during torrential rainfall event of 22 July 2010 in Jinghe Basin

摘要

The Global Satellite Mapping of Precipitation product (GSMaP)[1], is a recent solution of satellite-based precipitation estimates which provides global rainfall products of high spatial (0.1°) and temporal resolutions (1 hour). This paper presents a study of GSMaP precipitation products (GSMaP_MVK and GSMaP_Gauge) for a torrential precipitation event in Jinghe Basin (from 06:00 AM on 22 July 2010 to 11:00 AM on 24 July 2010). Measurements from a dense rain gauge network are used as the ground truth to evaluate the latest GSMaP products. Study results demonstrate the precision of GSMaP_MVK product has strong correlation with both elevation and rainfall intensity, which makes GSMaP_MVK perform poorly in high-altitude mountain storm center. Furthermore, for corresponding rainstorm area, significantly improvement could be found in ground correction products (GSMaP_Gauge), which suggests effectiveness and broad prospects of precipitation assimilation techniques.