Near real time product of the gauge adjusted GSMaP (GSMaP_Gauge_NRT)

摘要

This paper describes the rain gauge adjusted algorithm for the Global Satellite Mapping of Precipitation (GSMaP_Gauge_NRT) that estimates the surface rainfall rate with the resolution of 0.1 degree and 1 hour resolution over the globe in near realtime. Precipitation is one of the most important parameters on the earth system, and the global distribution of precipitation and its change are essential data for modeling the water cycle, maintaining the ecosystem environment, agricultural production, improvements of the weather forecast precision, flood warning and so on. In the GPM (Global Precipitation Measurement) project, the integrated products of high resolution mapping of precipitation from microwave measurements from constellation satellite and infrared radiometers from geo-stationary orbit are developed and supplied to the public. However, sometimes such high resolution product such as GSMaP_NRT underestimates the surface precipitateon and causes large error for hydrological modeling. In this paper, global gauge data set are combined with GSMaP_NRT. After describing and evaluating the GSMaP_Gauge which is a gauge adjusted product of the GSMaP_MVK, the methodology of a new combined algorithm (GSMaP_Gauge_NRT) is described.