1 Development of GTS and Data Exchange in China National Meteorological Information Center, CMA

2 Outline CMA ’ s GTS system Data received via GTS China ’ s meteorological data and products shared over GTS and CMA ’ s PCVSAT system Requirements on ATOVS data

3 CMA’s GTS system

4 Development of CMA’s GTS system The first generation CMA ’ s GTS system started operation in GTS circuits connected with Beijing Ulan Bator, Pyongyang, Moscow, Hanoi, Tokyo, Offenbach The second generation CMA ’ s GTS system put into operation in 1991 RTH Beijing designated by WMO in 1993 The number of GTS circuits grew to nine The new links to Seoul, Bangkok, and New Delhi established Circuit rate and protocol upgraded Migration to TCP/IP completed on the links to Offenbach, Tokyo, Moscow, Seoul, Ulan Bator The third generation CMA ’ s GTS system put into operation

5 Current Status of CMA’s GTS System —— GTS links connected with RTH Beijing GTS link toSPEED (Kbps) CIRCUIT TYPE PROTOCOL Offenbach48/48FRFTP Tokyo48/48FRTCP sockets Moscow8/8FRFTP Seoul32/32FRTCP sockets Bangkok9.6Leased LineX.25 PVC New Delhi9.6Leased LineX.25 PVC Ulan Bator14.4Leased LineFTP Pyongyang75BaudLeased LineASYNC Hanoi75BaudLeased LineASYNC

6 Current Status of CMA’s GTS System —— Detailed configuration of the GTS links

7 Current Status of CMA’s GTS System —— Detailed configuration of the GTS system

8 A firewall set up on the IP based connections X.25 circuits and asynchronous circuits connected to the system via a multiprotocol router Computer systems – The front end and the back end are two separate systems. – Each system is a duplicated system. – UNIX based Application Software – Front end collecting and disseminating data over GTS Supporting FTP, TCP sockets, X.25, ASYNC – Back end checking data packaging messages and files distributing data to the other internal operational systems, such as real-time database. – Operational monitor system monitoring and managing the application system C/S based software running on Linux based PCs Web Server – located in the DMZ of CMA’s Internet system – providing real-time observations and CMA’s products to national and international users – collecting meteorological data from other GTS centers by FTP, Web Ingest and via Internet Current Status of CMA’s GTS System —— Configurations and Functions of the GTS system

9 Data received via GTS

10 Global observations TAC code: SYNOP, TEMP, PILOT, SHIP, BATHY, BUOY, CLIMAT, CLIMAT TEMP, AIREP, AMDAR, TRACKOB, TESAC, WAVEOB, SATEM, SARAD, SATOB …… BUFR code: ATOVS(NOAA, EARS), AMDAR …… NWP products ECMWF, EDZW, EGRR, KWBC GRIB products Fax charts RJTD, RUMS fax charts

11 ATOVS data received from GTS (1) EARS products: received via Beijing-Offenbach GTS link Instrument Abbreviate Bulletin Header Allocation Typical Range of Bulletin Headers Originating centre AMSU-AINAXii_EUMSii = 01 to 08 Frascati (ESA/ESRIN) AMSU-BINBXii_EUMSii = 01 to 43 HIRSINHXii_EUMSii = 01 to 20

12 ATOVS data received from GTS (2) NOAA Satellites ATOVS Data: received via Beijing-Tokyo GTS link Instrume nt Abbreviate Bulletin Header Allocation Typical Range of Bulletin Headers Geographical areaOriginating centre AMSU-A AMSU-B HIRS IUXCii_KWBCii = 01 to ° - 90°E northern hemisphere 90°E - 0° northern hemisphere NCEP IUXDii_KWBCii = 01 to11

13 Traffic statistics on Beijing-Offenbach GTS link Symmetric bandwidth Data exchanged via ftp 1.1 Mbytes/day 177 Mbytes/day - including EARS products 100Mbytes CIR=48kbps Beijing FR Offenbach 48Kbps

14 Traffic statistics on Beijing-Tokyo GTS link Symmetric bandwidth Data exchanged via TCP sockets 1.8 Mbytes/day 38 Mbytes/day - including NOAA Satellites ATOVS products 2.5Mbytes CIR=48kbps Beijing FR Tokyo 48Kbps

15 China’s meteorological data and products shared over GTS and CMA’s PCVSAT system

16 China’s meteorological data and products shared over GTS China ’ s observations (in TAC code) SYNOP, TEMP, PILOT, CLIMAT, CLIMAT TEMP, AMDAR …… RSMC Beijing products (in GRIB code) Global model T213 Element: Po, H, T, Td, U, V Data times: 00 UTC, 12 UTC Forecast times: HH+00, …, H+168 Δt = 12 h Levels: Surface,1000, 925,850,700,500,400,300,250,200,150,100hPa Resolution: 1°* 1°

17 CMA’s PCVSAT system Total rate of broadcasting: 2Mbps Supporting 256 logical channels, the typical logical channel rate is 64kbps Authorization and management centralized at hub Over 2300 remotes installed in China and some NMHSs of neighboring countries Pyongyang, Ulan Bator, Hanoi

18 China’s meteorological data and products shared over CMA’s PCVSAT system China ’ s observations (in TAC code) SYNOP, TEMP, PILOT, CLIMAT, CLIMAT TEMP, AMDAR …… RSMC Beijing products (in GRIB code) Global model T213 (same as the data disseminated over GTS) Regional model HLAFS Element: Po, H, T, Td, U, V, divergence, vertical velocity, moisture flux, divergence of moisture flux, depression of dew point, pseudo-equivalent temperature Data times: 00 UTC, 12 UTC Forecast times: HH+00, 06, 12, 18, 24, 30, 36, 42, 48 Levels: Surface,1000, 925,850,700,500,400,300,250,200,150,100hPa Resolution: 0.25°* 0.25° FY-2C satellite images (files): visible, infrared and water vapor cloud images

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20 Requirements on ATOVS data

21 Requirements on ATOVS data We hope that we could get NCEP ’ s ATOVS data on real time via GTS: NOAA 15,16,17 ‘ s 1B global data. 3*14 Orbits/day. 40channels/Orbit(include: HIRS, AMSU-A, AMSU-B).

22 Thank you!