9:15 AM - 9:30 AM
[ACG46-20] Three-year results of the Global Precipitation Measurement (GPM) mission in Japan
Keywords:GPM, Satellite Remote Sensing, Precipitation
JAXA also develops the Global Satellite Mapping of Precipitation (GSMaP), as national product to distribute hourly and 0.1-degree horizontal resolution rainfall map. The GSMaP near-real-time version (GSMaP_NRT) product is available 4-hour after observation through the “JAXA Global Rainfall Watch” web site (http://sharaku.eorc.jaxa.jp/GSMaP) since 2008. The GSMaP_NRT product gives higher priority to data latency than accuracy, and has been used by various users for various purposes, such as rainfall monitoring, flood alert and warning, drought monitoring, crop yield forecast, and agricultural insurance.
There is, however, a requirement for shortening of data latency time from GSMaP users. To reduce data latency, JAXA has developed the GSMaP real-time version (GSMaP_NOW) product for observation area of the geostationary satellite Himawari-8 operated by the Japan Meteorological Agency (JMA). GSMaP_NOW product was released to public in November 2, 2015 through the “JAXA Real-time Rainfall Watch” web site (http://sharaku.eorc.jaxa.jp/GSMaP_NOW/).
All GPM standard products and the GPM-GSMaP product have been released to the public since September 2014 as Version 03. The GPM products can be downloaded via the internet through the JAXA G-Portal (https://www.gportal.jaxa.jp). The DPR, the GMI, and the DPR-GMI combined algorithms will be updated in April 2017 and the latent heating product will be released in June 2017 as Version 04.
New calibration factors will be applied for both Ku and Ka-band radars. As its results, values of Z factor will increase, but estimated value of rain intensity does not necessarily increase. Also calibration factors of TRMM/PR will be re-examined to have consistency between DPR/Ku. Furthermore, the GPM-GSMaP algorithms were updated and the GPM-GSMaP Version 04 products have been provided since Jan. 2017.