GPM-GSMaP data is now available from JAXA G-portal ( as well as current GSMaP web site (

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2 GPM-GSMaP data is now available from JAXA G-portal ( as well as current GSMaP web site ( GSMaP/).

3 GPM Core GMI TRMM PR GPM era Precipitation Radar Good: can observe vertical structure. Bad: there are not many. Rainfall Data Base Microwave Imager / Sounder GCOM-W1 AMSR2 DMSP SSM/I, SSMIS GSMaP Microwave Radiometer Algorithms Rainfall Data from each Microwave Radiometer Merged Microwave Rainfall Data (Okamoto et al. 2005, Kubota et al, 2007, Aonashi et al. 2009, Ushio et al. 2009, Shige et al. 2009, Kachi et al. 2011, Mega et al., 2014, etc.) NOAA/MetOp AMSU (sounder) Good: highfrequent (wide swath, multisatellites) Bad: cannot measure vertical structure (need info. from radar) IR Imager Geostationary Satellites Microwave-IR Merged Algorithm (CMV, K/F) GSMaP_MVK (satellite-only) GSMaP_Gauge (0.1x0.1 deg. box, Hourly)

4 Cloud motion vectors

5 Standard product (Latency: 3 days) Near-real-time product (Latency: 4 hours)

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7 TRMM-era GSMaP (without GMI) GPM-era GSMaP (with GMI) DPR observation

8 TRMM/TMI GCOM-W/AMSR2 DMSP-F18/SSMIS NOAA-N19/AMSU/MHS GPM Core/GMI EORC/JAXA is developing GMI Tb bias correction (Okuyama, Imaoka et al.)

9 GSMaP_MVK GSMaP_Gauge GSMaP_NRT (FW) MWR Merged TRMMPR 3A25 Reference NOAA/CPC daily Gauge Analysis

10 GSMaP_MVK GSMaP_Gauge GSMaP_NRT MWR Merged PR 3A25 CPC Gauge GSMaP_MVK GSMaP_NRT MWR Merged PR 3A25 Land Ocean

11 was compared with JMA s Radar GSMaP_MVK GSMaP_Gauge Gauge-Radar Analysis JMA radar coverage RMSE=0.35mm/h Corr.=0.825 RMSE=0.16mm/h Corr.=0.871 GSMaP_Gauge shows better correlation with less Root Mean Square Error (RMSE) on 12 th Apr

12 GSMaP_MVK GSMaP_Gauge TRMM-GSMaP_NRT Mean RMSE (Apr.-Jun. 2014) GSMaP_MVK: 0.33 mm/h GSMaP_Gauge: 0.29 mm/h TRMM-GSMaP_NRT: 0.35 mm/h

13 The GSMaP joins the International Precipitation Working Group (IPWG) validation activities. We validates various satellite estimates around Japan. Our GSMaP products are validated in U.S.(J.-J.Wang/J. Janowiak), Australia (E. Ebert ), South America (D. Vila), Europe (C. Kidd), South Africa (E. Becker) and Japan (S. Shige).

14 Fixed DB Current TRMM/PR-based Database (DB) Use DB based on TRMM/PR obs. Fixed DB Use DB based on both PR and DPR obs. Mid-to-high latitudes outside PR ranges will be covered by DPR. GPM-era (future; at least 1-year data is needed) Dual-frequency Precipitation Radar (DPR)

15 By a network of direct readout stations, ATOVS data can be obtained within 30 minutes of the satellite overpass! An example of Asia-Pacific Regional ATOVS Retransmission Service (AP-RARS) (Murata 2007) Example of direct readout stations Example of AMSU-A NOAA-18

16 RARS METOP-1_AMSU-A METOP-1_MHS METOP-2_AMSU-A METOP-2_MHS NOAA-18_AMSU-A NOAA-18_MHS NOAA-19_AMSU-A NOAA-19_MHS 0% 20% 40% 60% 80% 100% Min. We re now developing the < Almost all data are available within 30 min. from an observation start.

17 We re (Slide by JMA) Launch from the JAXA Tanegashima Space Center by the H-IIA F25 rocket with Himawari-8 onboard on 7 th Oct. 2014

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