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Remarks on APSDEU related issues by JMA

Remarks on APSDEU related issues by JMA. Masahiro KAZUMORI Numerical Prediction Division, Japan Meteorological Agency 1-3-4, Otemachi, Chiyoda-ku, Tokyo 100-8122, JAPAN kazumori@met.kishou.go.jp. APSDEU-8 Montreal, Canada, October 10-12, 2007. Importance of satellite data in NWP.

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Remarks on APSDEU related issues by JMA

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  1. Remarks on APSDEU related issues by JMA Masahiro KAZUMORI Numerical Prediction Division, Japan Meteorological Agency 1-3-4, Otemachi, Chiyoda-ku, Tokyo 100-8122, JAPAN kazumori@met.kishou.go.jp APSDEU-8 Montreal, Canada, October 10-12, 2007

  2. Importance of satellite data in NWP • In Asia-Pacific region (Region-II), data exchanges on GTS have played an important role for operational NWP centers. • Link between Washington and Tokyo is one of the most important link because NOAA data including global satellite data are distributed through this route to Region-II. • In May 2-9,2007, there was a big gap of the data exchanges of global satellite data (NOAA/AMSU and DMSP/SSMI). Other data exchanges (in-situ data, ACARS data etc.) were normal. • The reason of this problem was a trouble of the data delivering from NESDIS to NWS.

  3. Importance of satellite data in NWP The time sequence of the available data number in 6-hourly assimilation time window. The data gap impacts on JMA forecast score NOAA-16/AMSU-A NOAA-16/AMSU-B DMSP/SSMI The data gap brought bad impacts on forecast score in the Tropics and the S.H.

  4. Importance of satellite data in NWP • JMA recognizes the importance of day-to-day monitoring to identify problems related to the satellite data particularly when they originate from data server troubles or instruments problems. • Early notification of such server troubles and instruments problems from NOAA is useful for NWP centers in Asia-Pacific region. Also notifications from data users must be helpful for NOAA. • Close relationship between data providers and data users is essential for satellite data utilizations in operational NWP . • In this meeting, NOAA/NWS has provided for us the detail contact information (NWS and NESDIS) about the data on GTS. • JMA really appreciates the useful information and NOAA’s supports.

  5. NOAA-18 ATOVS data on GTS • Global NOAA/ATOVS and DMSP/SSMI data are delivered from Washington to Tokyo. • These data are passed to Hong Kong and Beijing for NWP purposes. • Currently, Tokyo receives global NOAA15,16 and 17 data via GTS. These satellite are secondary satellites in polar orbit satellite constellation. • Current primary satellites are Metop and NOAA-18. • JMA expects NOAA-18 ATOVS data on GTS between Washington and Tokyo. (Currently, JMA receives NOAA-15,16,17, and 18 data from NWS server via Internet (FTP) as a back up of GTS route.)

  6. GTS (global data from NOAA) ATOVS data latency at JMA • ATOVS data is essential data for NWP community. • JMA and other NWP centers in Asia-Pacific Region receive ATOVS data by GTS and direct readout (AP-RARS). • Through Tokyo, global NOAA/ATOVS (NOAA-15,16,17) is delivered from NOAA. • Through Beijing, global Metop/ATOVS is delivered from EUMETSAT. • Internet route can be thought as a backup route of GTS.(Because GTS link is much stable than Internet.) • However, the data latency of GTS route is a little bit worse than Internet route for global NOAA/ATOVS. • JMA expects NOAA to look the data latency of GTS (or data delivering time to NWS/GTS server from NESDIS?) for NOAA/ATOVS data. Internet (global data from NOAA) EARS ATOVS (GTS route) Cut off time of Meso-scale analysis Cut off time of global early analysis

  7. Data difference between Internet and GTS • ATOVS data seems identical between GTS and Internet. • SSMI data has some differences. Coverage and TBB value.

  8. SSMI Observation location difference (about 4 km) 1/10 thinning

  9. Internet                                 GTS SSMI14_200710092206-200710092332.54282  NPR.SDRR.S8.D07282.S2206.E2332.B5428182.NS SSMI14_200710092337-200710100119.54283  NPR.SDRR.S8.D07282.S2337.E0119.B5428283.NS SSMI14_200710100241-200710100428.54285  NPR.SDRR.S8.D07283.S0241.E0428.B5428384.NS SSMI14_200710100435-200710100816.54287  NPR.SDRR.S8.D07283.S0435.E0816.B5428587.NS SSMI14_200710100824-200710100957.54288  NPR.SDRR.S8.D07283.S0824.E0957.B5428788.NS SSMI14_200710101003-200710101138.54289  NPR.SDRR.S8.D07283.S1003.E1138.B5428889.NS SSMI14_200710101143-200710101326.54290  NPR.SDRR.S8.D07283.S1143.E1326.B5428990.NS  not same dataSSMI14_200710101332-200710101507.54291  NPR.SDRR.S8.D07283.S1332.E1507.B5429091.NS SSMI14_200710101512-200710101647.54292  NPR.SDRR.S8.D07283.S1512.E1647.B5429192.NS SSMI14_200710101653-200710101828.54293  NPR.SDRR.S8.D07283.S1653.E1828.B5429293.NS SSMI14_200710101802-200710101828.54293  NPR.SDRR.S8.D07283.S1802.E1828.B5429293.NS SSMI14_200710101833-200710102008.54294  NPR.SDRR.S8.D07283.S1833.E2008.B5429394.NS SSMI14_200710102013-200710102146.54295  NPR.SDRR.S8.D07283.S2013.E2146.B5429495.NS SSMI14_200710102151-200710102316.54296  NPR.SDRR.S8.D07283.S2151.E2316.B5429596.NS SSMI14_200710102321-200710110104.54297  NPR.SDRR.S8.D07283.S2321.E0104.B5429697.NS SSMI14_200710110109-200710110234.54298  NPR.SDRR.S8.D07284.S0109.E0234.B5429798.NS SSMI14_200710110239-200710110413.54299  NPR.SDRR.S8.D07284.S0239.E0413.B5429898.NS SSMI14_200710110418-200710110619.54300  NPR.SDRR.S8.D07284.S0418.E0619.B5429900.NS SSMI14_200710110625-200710110801.54301  NPR.SDRR.S8.D07284.S0625.E0801.B5430001.NS SSMI data in NOAA/CLASS are identical with SSMI data in NWS FTP site. SSMI data in GTS are different from others.

  10. AP-RARS data monitoring at JMA

  11. AP-RARS data monitoring web • JMA is preparing an AP-RARS data monitoring web page. • AP-RARS data from Kiyose and Syowa station data are mainly monitored in the web page. • The web page is in final review stage in JMA. The web page will be open soon. • The contents (tentative) • Available AP-RARS data distribution in each station. • The information of HRPT station. • Comparison of navigation difference between global data and AP-RARS data. • …

  12. Example: Time series of navigation difference between global data and AP-RARS data Probably, BoM and KMA use TBUS, and CMA and Singapore use TLE. JMA used TLE as orbit information. Necessary to update the orbit information to keep accurate navigation. Better to use same orbit information and update it frequently.

  13. Answer to the question of SATEM format • JMA receives ATOVS retrievals (temperature and moisture profiles) from NOAA with two kinds of formats (i.e., SATEM and BUFR format) • As for JMA, we can discontinue the use of SATEM format. • However, when the use of format is discontinue in NOAA, we’d like to receive a notification in advance from NOAA about the termination date and expect a parallel delivering (at least one month period ) with new format.

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