Remarks on APSDEU related issues by JMA

Masahiro KAZUMORINumerical Prediction Division, Japan Meteorological Agency

1-3-4, Otemachi, Chiyoda-ku, Tokyo 100-8122, JAPANkazumori@met.kishou.go.jp

APSDEU-8 Montreal, Canada, October 10-12, 2007

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.

Importance of satellite data in NWP

NOAA-16/AMSU-A NOAA-16/AMSU-B

DMSP/SSMI

The time sequence of the available data number in 6-hourly assimilation time window.

The data gap brought bad impacts on forecast score in the Tropics and the S.H.

The data gap impacts on JMA forecast score

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.

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.)

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.

データの利用可能な時刻（積算割合）

0%10%20%30%40%50%60%70%80%90%

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データの利用可能な時刻（積算割合）

0%10%20%30%40%50%60%70%80%90%

100%

0:00 1:00 2:00 3:00 4:00 5:00 6:00 7:00 8:00 9:00 10:00 11:00 12:00

データの利用可能な時刻（積算割合）

0%10%20%30%40%50%60%70%80%90%

100%

0:00 1:00 2:00 3:00 4:00 5:00 6:00 7:00 8:00 9:00 10:00 11:00 12:00

GTS (global data from NOAA)GTS (global data from NOAA)

Internet (global data from NOAA)Internet (global data from NOAA)

EARS ATOVS (GTS route)EARS ATOVS (GTS route)

Cut off time of Meso-scale analysis Cut off time of global early analysis

Data difference between Internet and GTS

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

SSMI Observation location difference (about 4 km)

1/10 thinning

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.

AP-RARS data monitoring at JMA

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 m

onitored in the web page. The web page is in final review stage in JMA. The web page will b

e 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.…

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.

Example:

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.