1 / 15

Projects under development

Projects under development. Assimilation of precipitation, soil moisture & GPS radio-occultations ( Funding from GRIP Canadian Space Agency) Assimilation of ground-based GPS Zenith Tropospheric Delay AIRS radiances/clear sky SSM/I radiances/clear sky

doris
Download Presentation

Projects under development

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Projects under development • Assimilation of • precipitation, soil moisture & GPS radio-occultations ( Funding from GRIP Canadian Space Agency) • Assimilation of • ground-based GPS Zenith Tropospheric Delay • AIRS radiances/clear sky • SSM/I radiances/clear sky • Assimilation system for GEM-strato (top of model moved from 10 to 0.1 hPa)

  2. Meteorological Service of Canada Environment Canada Assimilation of Precipitation • Assimilate rain information over the oceans • Emphasis on tropical and extra-tropical cyclones • Brightness Temperature 1D-Var (SSM/I, TRMM-TMI) • Surface Rain Rate1D-Var (SSM/I, TRMM-TMI/PR) • Develop a strategy to assimilate rain information: Either a 1D-Var (analyzed IWV) + 4D-Var or Direct 3D-Var assimilation • Kain-Fritsch, CLOUST (TJ 2003), RTTOVSCATT • Background from GEM-mesoglobal (58 levels, top at 10 hPa, 0.45ox 0.3o grid, 12h forecast) GRIP (Government Related Initiatives Program) Canadian Space Agency (CSA)

  3. TROPICAL CYCLONE ZOE (2002 12 27 0000 UTC):T and Q Inc.Assimilation of F15 SSM/I Tb SRR SRR SRR SRR Temperature increments (K) Specific Humidity increments (gkg-1)

  4. Assimilation of Atmospheric Refractivity from GPS Radio-Occultations • 2 Satellites operating: CHAMP, SAC-C • Average 200 occultations/day (50 refractivity measures/profile) • Occultations assimilated with CMC operational 3D-Var • Experiment to be performed for Jan 2004 • Data is refractivity vs. geometric height. • Bending angle vs. impact parameter is under development • Measurements below 5 km black-listed (retrieval algorithms not sufficiently reliable yet). • First Results from CHAMP/SAC-C tests expected by September 2004. • Then prepare for COSMIC data (3000 occu.’s/day). Simulated data. Launch late 2005. GRIP (Government Related Initiatives Program) Canadian Space Agency

  5. CHAMP+SAC-C Refractivity 3D-Var Assimilation 2004 01 06 0000 UTC (±3h) OBS-Forecast & OBS-Analysis: mean & ±1σ

  6. Assimilation of soil moisture • Develop CALDAS: provide initial state for NWP model -off-line land surface process model ISBA (Noilhan et al.) -assimilate Tb (1.4-19 GHz) + IR Tskin -2D-Var and/or Kalman filter • Preparation for ESSP HYDROS (L-band active and passive) (2010 launch) -soil moisture & freeze/thaw state GRIP (Government Related Initiatives Program) Canadian Space Agency

  7. Assimilation of Ground-based GPS ZTD & GPS met Surface Pressure • 1) Collocation study on Integrated Water Vapor: radiosondes, ground-based GPS and analyses/6h trials from GEM global (28 levels, 0.9o). • 2) Impact of Assimilating ZTD & Ps Obs. on Q: 1D-Var with synthetic background and obs • 3) Future work: Assimilation in regional model. Work in progress.

  8. Ground-Based GPS IWV collocation study 7 months: April, June, July, August, October 2001 & January 2002 112 sites: Final GPS zenith tropospheric delay estimation (7 AC) (final orbit product) 16 sites: GPS met Ps 66 sites: Have collocated radiosondes

  9. IGS data set (3-way comparison) TRIAL (6h) RS GPS RELATIVE ERROR (%) ABSOLUTE ERROR (mm) TRIAL RS GPS

  10. Assimilation of ZTD & Ps Observations: 1D-Var with synthetic background and obs ZTD obs error = 12 mm • Impact of assimilating Ps & ZTD on analyzed Q: • -Slightly higher error reduction due to correlation of model Ps and Q errors. • -Assimilation of Ps observations results in more accurate analyzed Ps

  11. HYPERSPECTRAL INFRARED (AIRS) • 281 channel set received via internet • RTTOV-7 radiative transfer model • Current work on cloud mask, cloud top determination, pixel • selection, monitoring, bias correction, visualization tools • Choice of channels still open, but to begin with: • - channels insensitive above model top at 10hPa • - channels insensitive to surface over land • - expected initial number of the order of 80-100 • Current personal: 1 PhD, 1 MSc (GRIP CSA), +1 Post-doc in fall • Assimilation cycles to begin fall 2004 • First operational implementation by mid 2005, in 4D-var system

  12. GEM-Strato (model top extended from 10 to 0.1 hPa) • Improve forecast in the stratosphere • Assimilate channels with non-zero weighting function above 10 hPa (AMSU-A 11-14 + more weight on AMSU-A 9-10 + AIRS/IASI) • Future data assimilation of stratospheric ozone • Hybrid vertical coordinate Laprise and Girard (1990), 80 vertical levels, top at 0.1 hPa • 3D-Var Analysis levels same as GEM-strato • Moisture analysis up to 70 hPa (was 300 hPa) • Analyses/fcsts improved in the lower stratosphere - above 100 hPa much better than GEM-operational

  13. Jan/Feb 2002: Operational & GEM-Strato —Verification vs raobs NH GZ T UV T-Td

  14. ASSIMILATION OF SSM/I TB/CLEAR SKY F13,F14,F15 July 2003 INTEGRATED WATER VAPOR

  15. ASSIMILATION OF SSM/I TB/CLEAR SKY F13,F14,F15 • SSM/I Tb ready for parallel runs Oct 2004

More Related