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Status of AP-RARS implementation at Tokyo

Status of AP-RARS implementation at Tokyo. Japan Meteorological Agency Prepared by A. Nakazono, T. Saito, H. Murata Presented by Y. Takeuchi. Contents. Brief History Network Configuration Coverage Available Times Traffic Analysis Standardization issues File Naming Telecommunication

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Status of AP-RARS implementation at Tokyo

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  1. Status of AP-RARS implementation at Tokyo Japan Meteorological Agency Prepared by A. Nakazono, T. Saito, H. Murata Presented by Y. Takeuchi APSDEU-7, Honolulu/Hawaii

  2. Contents • Brief History • Network Configuration • Coverage • Available Times • Traffic Analysis • Standardization issues • File Naming • Telecommunication • Requirements of JMA • Summary APSDEU-7, Honolulu/Hawaii

  3. Significance of RARS • Filling the geographical gap for near real-time use • Complementary reception of different satellites with adjacent local passing time • Backup by the neighbor site at outage, maintenance, replace of a reception site APSDEU-7, Honolulu/Hawaii

  4. Brief History • 1-3 June 2005 Establishment of AP-RARS and exchange of AAPP data through the GTS were agreed in the APSDEU-6 meeting at Seoul/Republic of Korea • 1-2 Dec 2005 Detailed AP-RARS implementation schedule for 12 HRPT stations was coordinated and agreed at the 2nd WMO World RARS and ADM Workshop, Geneva • 7 June 2006 BoM, CMA and JMA started pilot exchange of AAPP Level-1C data from 8 HRPT stations through GTS circuits; i.e. Tokyo-Melbourne and Tokyo-Beijing. • 21 August 2006 JMA started providing the data from Syowa HRPT Station, Antarctica . • 15 September 2006 Communication test to start between JMA and KMA; Seoul will be the 10th HRPT station APSDEU-7, Honolulu/Hawaii

  5. Beijing Seoul Urumuqi Kiyose (Tokyo) Guangzhou GTS circuits Domestic links Darwin HRPT receiving stations HRPT receiving sites (planned for September 2006) Crib Point 1 Crib Point 2 (Melbourne) Perth Syowa Network Configuration(as of August 2006) APSDEU-7, Honolulu/Hawaii

  6. Data Flow of Syowa Data NOAA & SSM/I • INTELSAT • 1Mbps National Institute of Polar Research Direct Broadcast • FEB 2004- HRPT & TIP (c) NIPR AUG 2005- JMA/MSC • FEB 1997- • AAPP L1C Proc. SEP 2004- • Products (Map, Time sequence) AUG 2006- BoM & CMA JMA/HQ • GSM fcst 81MB/day • Wave model fcst 2MB/day • (GRIB 1.25deg) Assimilation & Forecast OCT 2004- RSMC server Syowa base AUG 2004- RV Shirase Dome Fuji APSDEU-7, Honolulu/Hawaii

  7. Coverage (as of August 2006) Implemented Coverage APSDEU-7, Honolulu/Hawaii

  8. A vista example APSDEU-7, Honolulu/Hawaii

  9. Available Time at Tokyo Site ID : CPT (Cribpoint) Sampling Days : Sep/2-Sep/13,2006 (12 days) Total Number of Files : 537 Rate of Files Received within 30 min : 89.2% 50% Files are Received within 26 min 80% Files are Received within 28 min 90% Files are Received within 32 min Averaged Time : 32.1 min Elapsed time from compilation of a file to reception at RTH Tokyo: 2 to 5 minutes APSDEU-7, Honolulu/Hawaii

  10. Available Time at Tokyo Site ID : MEL (Melbourne) Sampling Days : Sep/2-Sep/13,2006 (12 days) Total Number of Files : 111 Rate of Files Received within 30 min : 100.0% 50% Files are Received within 22 min 80% Files are Received within 22 min 90% Files are Received within 22 min Averaged Time : 18.9 min Elapsed time from compilation of a file to reception at RTH Tokyo: 2 to 5 minutes APSDEU-7, Honolulu/Hawaii

  11. Available Time at Tokyo Site ID : DAR (Darwin) Sampling Days : Sep/2-Sep/13,2006 (12 days) Total Number of Files : 339 Rate of Files Received within 30 min : 46.0% 50% Files are Received within 32 min 80% Files are Received within 34 min 90% Files are Received within 36 min Averaged Time : 30.2 min Elapsed time from compilation of a file to reception at RTH Tokyo: 2 to 5 minutes APSDEU-7, Honolulu/Hawaii

  12. Available Time at Tokyo Site ID : PTH (Perth) Sampling Days : Sep/2-Sep/13,2006 (12 days) Total Number of Files : 438 Rate of Files Received within 30 min : 54.8% 50% Files are Received within 30 min 80% Files are Received within 34 min 90% Files are Received within 38 min Averaged Time : 30.8 min Elapsed time from compilation of a file to reception at RTH Tokyo: 2 to 6 minutes APSDEU-7, Honolulu/Hawaii

  13. Available Time at Tokyo Site ID : pek (China) Sampling Days : Sep/2-Sep/13,2006 (12 days) Total Number of Files : 836 Rate of Files Received within 30 min : 5.0% 50% Files are Received within 56 min 80% Files are Received within 70 min 90% Files are Received within 110 min Averaged Time : 72.0 min Elapsed time from compilation of a file to reception at RTH Tokyo: 9 to 18 minutes APSDEU-7, Honolulu/Hawaii

  14. Available Time at Tokyo Site ID : kiy (Kiyose/Tokyo) Sampling Days : Sep/2-Sep/13,2006 (12 days) Total Number of Files : 336 Rate of Files Received within 30 min : 78.9% 50% Files are Received within 16 min 80% Files are Received within 32 min 90% Files are Received within 60 min Averaged Time : 23.6 min APSDEU-7, Honolulu/Hawaii

  15. Available Time at Tokyo Site ID : syo (Syowa/Antarctica) Sampling Days : Sep/2-Sep/13,2006 (12 days) Total Number of Files : 245 Rate of Files Received within 30 min : 81.6% 50% Files are Received within 24 min 80% Files are Received within 28 min 90% Files are Received within 44 min Averaged Time : 28.4 min APSDEU-7, Honolulu/Hawaii

  16. 28% of CIR CIR Traffic Analysis CIR: Committed Information Rate APSDEU-7, Honolulu/Hawaii

  17. 83% of CIR CIR Traffic Analysis CIR: Committed Information Rate APSDEU-7, Honolulu/Hawaii

  18. Implementation of the File Naming Convention • Basic Rule on the GTS • Defined in the WMO Manual on the GTS, Attachment II-15 • AP-RARS Convention • Z_RARS_C_cccc_yyyyMMddhhmmss_Rrrr_AAPPfilename_bufr.bin • cccc: Location Indicator of the centre that compiled the file (e.g. RJTD for Tokyo); • yyyyMMddhhmmss: time of compilation in UTC; • rrr: Identifier of HRPT receiving station; should be determined in coordination with WMO • AAPP filename: Actual AAPP filename. The dot (.) character in the AAPP filename shall be replaced by a minus (-) sign or underscore (_). APSDEU-7, Honolulu/Hawaii

  19. Real File Names in use • Real examples in useZ_RARS_C_AMMC_20060601045520_RMEL_aman_l1c_bufr.binZ_RARS_C_BAWX_20060531070136_Rpek_amsua_20060531_0248_noaa17_20435_PEK_l1c_bufr.binZ_RARS_C_RJTD_20060323023325_Rkiy_amsual1c_noaa17_20060323_0233_19453_l1c_bufr.bin • Discrepancy in file naming between centers exist; especially AAPP file names as shown in orange in the examples above differ each other • Station identifiers (rrr) are assigned in non-coordinated manner: CPT: Crib Point, Australia DAR: Darwin, Australia kiy: Kiyose, Japan MEL: Crib Point, Australia pek: Beijing/Guangzhou/Urumuqi, China PTH: Perth, Australia syo: Syowa Base, Antarctica (Japan) seo: Seoul, Republic of Korea (planned) APSDEU-7, Honolulu/Hawaii

  20. Discrepancy of naming between centers ① ③ ② Z_RARS_C_cccc_yyyyMMddhhmmss_Rrrr_(AAPP filename)_bufr.bin BoM：Z_RARS_C_AMMC_20060801080855_RMEL_hrsn_l1c_bufr.bin CMA：Z_RARS_C_BAWX_20060801075501_Rpek_hirs_20060801_0728_noaa18_06175_PEK_l1c_bufr.bin JMA：Z_RARS_C_RJTD_20060801054652_Rkiy_hirsl1c_noaa18_20060801_0546_06173_l1c_bufr.bin KMA：Z_RARS_C_RKSL_20060801004500_Rseo_hirsl1c_noaa17_20060801_0045_21316_l1c_bufr.bin APSDEU-7, Honolulu/Hawaii

  21. Telecommunication Procedures • An ATOVS file is transferred by FTP-put whenever it becomes available for transmission. • Procedures applied are basically in compliance with WMO standards prescribed in the Manual on the GTS, Attachment II-15 (file naming; re-naming with the temporal extension ‘.tmp’). • Telecommunication procedures are coordinated between GTS operators as the matter of GTS link; no further coordination is required for RARS. APSDEU-7, Honolulu/Hawaii

  22. Requirements of JMA to RARS • Extension of reception sitesSingapore, Honolulu are essential to enlarge the AP-RARS coverage. • Initiate the inter-regional exchange EARS & SA-RARS data from Washington to Tokyo(AP-RARS data could be sent from Tokyo to Washington if necessary) • Extension of AP-RARS to Metop/ATOVS, ASCAT APSDEU-7, Honolulu/Hawaii

  23. Summary • AP-RARS has started its initial operation in June 2006, in collaboration of BoM, CMA and JMA; KMA has started at 20 September 2006. • Currently AAPP level-1c data from 10 HRPT receiving stations are exchanged through GTS circuits using the operational file switching system of JMA. • Further improvements are expected to fulfill the RARS requirement, i.e. 30 minutes timeliness. • Traffic analysis shows that GTS links seem to have more spare capacity that could support further AP-RARS exchange. • Discrepancies between file name implementations are exist; expected to be considered. APSDEU-7, Honolulu/Hawaii

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