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Development of GTS and Data Exchange in China

National Meteorological Information Center, CMA

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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

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CMA’s GTS system

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Development of CMA’s GTS system

1980-1990The first generation CMA’s GTS system started operation in 1980

6 GTS circuits connected with Beijing• Ulan Bator, Pyongyang, Moscow, Hanoi, Tokyo, Offenbach

1991-2005The 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

2005.4The third generation CMA’s GTS system put into operation

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Current Status of CMA’s GTS System —— GTS links connected with RTH Beijing

GTS link to SPEED(Kbps)

CIRCUIT TYPE

PROTOCOL

Offenbach 48/48 FR FTP

Tokyo 48/48 FR TCP sockets

Moscow 8/8 FR FTP

Seoul 32/32 FR TCP sockets

Bangkok 9.6 Leased Line

X.25 PVC

New Delhi 9.6 Leased Line

X.25 PVC

Ulan Bator 14.4 Leased Line

FTP

Pyongyang 75Baud

Leased Line

ASYNC

Hanoi 75Baud

Leased Line

ASYNC

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

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

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• 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 E-mail via Internet

Current Status of CMA’s GTS System —— Configurations and Functions of the GTS system

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Data received via GTS

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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

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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-A INAXii_EUMS ii = 01 to 08

Frascati (ESA/ESRIN) AMSU-B INBXii_EUMS ii = 01 to 43

HIRS INHXii_EUMS ii = 01 to 20

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ATOVS data received from GTS (2)

NOAA Satellites ATOVS Data: received via Beijing-Tokyo GTS link

Instrument

Abbreviate

Bulletin Header

Allocation

Typical Range

of Bulletin Headers

Geographical area

Originating centre

AMSU-AAMSU-BHIRS

IUXCii_KWBC ii = 01 to 12 180° - 90°E northern hemisphere90°E - 0° northern hemisphere

NCEP

IUXDii_KWBC ii = 01 to11

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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

CIR=48kbps

Beijing

FR Offenbach48Kbps48Kbps

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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

CIR=48kbps

Beijing

FR Tokyo48Kbps48Kbps

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

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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°

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CMA’s PCVSAT system

Multiple AccessPC Card

UplinkFacility inBeijing

Asiasat-2

2300 ReceivingStations in ChinaAnd Neighbouringcountries

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

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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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Traffic Statistics on PCVSAT channels - 25/05/2005

0

20

40

60

80

100

120

00 03 06 09 12 15 18 21 00 UTC

Kilo

bits

/sec

From Beijing to Pyongyang From Beijing to Ulan Bator From Beijing to Hanoi

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Requirements on ATOVS data

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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) .

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Thank you!