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N. America-Europe 18 th Data Exchange Meeting Offenbach, Germany 25-27 April 2005

N. America-Europe 18 th Data Exchange Meeting Offenbach, Germany 25-27 April 2005. Use of satelite data in the Met Office. Roger Saunders Satellite Applications Met Office. Use of EUMETSAT EARS data for numerical weather prediction MODIS winds, GPS TCWV OSEs Satellite data volumes.

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N. America-Europe 18 th Data Exchange Meeting Offenbach, Germany 25-27 April 2005

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  1. N. America-Europe 18th Data Exchange MeetingOffenbach, Germany 25-27 April 2005

  2. Use of satelite data in the Met Office Roger Saunders Satellite Applications Met Office • Use of EUMETSAT EARS data for numerical weather prediction • MODIS winds, GPS TCWV • OSEs • Satellite data volumes

  3. Met Office NOAA Data Acquisition Exeter Washington EUMETCAST Local HRPT EARS 1a data Global 1b data AAPP AAPP AAPP 1c data to European Met Centres METO NWP 1a counts + housekeeping 1b counts + navigation + cal info 1c brightness temps 1d brightness temps on HIRS Grid 1d data on HIRS grid

  4. Mean ATOVS delay times

  5. EUMETSAT ATOVS Retransmission Service (EARS) NOAA BROADCAST HRPT UPLINK USER GTS NWP SAFQuality Control STATIONS AAPP EUMETSAT Dissemination Acquisition Demonstrates potential future dissemination concepts to meet shorter timeliness requirements Planned to be extended for NOAA-N,N’, Metop • MHS • ASCAT • AVHRR

  6. Gilmore Creek Monterey Edmonton Svalbard Wallops Kangerlussuaq Dartmouth Lannion Maspalomas Athens EARS ATOVS

  7. Data Formats/Availability

  8. Svalbard Kangerlussuaq Lannion Maspalomas Athens EARS AVHRR

  9. Arrival Times of Data • North Atlantic Region • six-hour window 09/09/2003 09:00-15:00 Update Run both 100% Main Run NESDIS 30% EARS 75% window First Overpass

  10. Global AMSU Data Used in the Main Run six-hour window 09/09/2003 09:00-15:00 Green: NOAA 15Blue: NOAA 16Red: NOAA 17

  11. Available EARS AMSU Data six-hour window 09/09/2003 09:00-15:00 Green: NOAA 15Blue: NOAA 16Red: NOAA 17

  12. Experiment to assess impact of early cut-off on forecasts • Period 12 May – 4 June 2003 • NOAA level 1b radiances used: • NOAA-15 AMSU-A/AMSU-B • NOAA-16 HIRS/AMSU-A/AMSU-B • NOAA-17 HIRS/AMSU-A/AMSU-B • Control: All data received before 1:50 (Ops) for main run and all late ATOVS used in update run • Experiment: All data received before 1:50 + all late ATOVS received (up to 50% more data) used in main model run

  13. Forecast impacts of late ATOVS N. Hemisphere Tropics S. Hemisphere

  14. Forecast impactsN. Hem500hPa Improved bust? 1:50 cut-off

  15. Forecast impactsS. Hem500hPa Consistent improvement 1:50 cut-off

  16. Summary • Receiving ATOVS 1A data from about 9 stations • Routinely compare level 1B Global (from NESDIS) with EARS level 1B (using AAPP) • Comparisons of: • Earth location • Brightness temperatures HIRS, AMSU • Assimilate in EUROLAM and global models with 2hr cut-off and get improved forecasts when EARS data is included.

  17. MODIS winds

  18. Forecast error evolution Aug 14th, 2004 500 hPa geopotential height CONTROL MODIS WINDS T+24 T+48 T+24 T+48 T+72 T+96 T+72 T+96 T+120 T+144 T+120 T+144 From: Mary Forsythe, Met Office

  19. GPS Stations for TCWV • Current GPS network shown over Europe • TCWV data put on GTS in real time • Plans to assimilate in Euro model

  20. GPS TCWV impacts on 12km UK Mes Model

  21. Comparison of overall impact of observing systems Global NWP score …surface pressure obs also very important to prevent drift in mass of atmosphere

  22. Projected number of satellite sensors for NWP

  23. Satellite data volumes entering Met Office N.B. exponential scale! METOP Launch

  24. Example: Detectable RFI at 6, 10 and 19 GHz From: Chris Kidd (Univ. Birmingham, UK) Blue = 6.8 GHz, Green = 10.7 GHz, Red = 19.4 GHz

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