How Does the Evaluation of the GPM IMERG Rainfall Product Depend on Gauge Density and Rainfall Intensity?

• DOI: 10.1175/jhm-d-17-0161.1
• Publication Date: 2017-12-18T19:54:40Z
• Authors: Fuqiang Tian; Shiyu Hou; Long Yang; Hongchang Hu; Aizhong Hou
• Keywords: Global Precipitation Measurement

Abstract This study investigates the dependency of evaluation Integrated Multisatellite Retrievals for Global Precipitation Measurement (IMERG) rainfall product on gauge density a ground-based rain network as well intensity over five subregions in mainland China. High-density gauges (1.5 per 100 km2) provide exceptional resources ground validation satellite estimates this region. Eight different networks were derived with contrasting densities ranging from 0.04 to 4 km2. The focuses two warm seasons (April–October) during 2014 and 2015. results show strong metrics IMERG intensity. A dense tends better metrics, which implies that previous evaluations based relatively low-density might have underestimated its performance. decreasing trends probability detection indicate limited ability capture light events product. However, overestimate (underestimate) (heavy) events, is consistent feature does not densities. valuable insights improvement retrieval algorithm adopted