[A-CG04_1PM2] Hydroclimate in Asian monsoon region

[ACG04-10] Assessment of GSMaP satellite rainfall products in Asian monsoon region

*Hideyuki KAMIMERA¹, Seishi NABESAKA¹, Fadli SYAMSUDIN², Thanh NGO-DUC³, Xe LE VIET⁴, Hilton T. HERNANDO⁵, Jun MATSUMOTO⁶, Tomoo USHIO⁷, Yoichi IWAMI¹ (1.International Centre for Water Hazard and Risk Management, Japan, 2.Agency for the Assessment and Application of Technology, Indonesia, 3.Vietnam National University at Ha Noi, Vietnam, 4.National Hydro-Meteorological Service, Vietnam, 5.Philippine Atmospheric, Geophysical and Astronomical Services Administration, the Philippines, 6.Tokyo Metropolitan University, Japan, also at Japan Agency for Marine-Earth Science and Technology, 7.Osaka University, Japan)

Keywords:Asian monsoon, precipitation, satellite

Satellite rainfall products provide the spatial and temporal distribution of rainfall estimates over the ungauged regions where no ground-based measurements with rain gauges and/or meteorological radars are available. For the regions, the satellite products have special importance in, for example, hydrological and agricultural applications such as flood forecasting/warning and water resources management. The Global Satellite Mapping of Precipitation (GSMaP) products have high resolution in space and time (0.1 deg. and 1 h); besides the near-real-time version of GSMaP opens to the public within four hours after measurements. They are thus highly expected to be in operational use in many countries and regions. There are the problems in accuracy and precision of the products due to the limitations on measuring principles, time intervals of sampling and others. However, the above-mentioned strengths of the products are considerable. Therefore, the performance of the GSMaP products needs to be investigated in various areas for the appropriate and effective use; moreover, through the investigation, it can be expected that the knowledge useful for improving the performance will be obtained. The present study investigates the performance of two GSMaP products, GSMaP_MVK and GSMaP_Gauge (a gauge-adjusted GSMaP_MVK), in the four river basins located from the tropics to mid-latitudes in the Asian monsoon region, including: the Solo Basin (16,100 km²) in Jawa, Indonesia; the Thu Bon–Vu Gia Basin (10,350 km²) in central Vietnam; the Pampanga Basin (9,759 km²) in Luzon, the Philippines; and the Tone Basin (16,840 km²), Japan. The study is ongoing and intermediate results mainly for the Solo and Thu Bon–Vu Gia river basins are discussed at this session.