1 / 23

Satellite Data

Satellite-Derived Fluxes and Comparisons with NWP Data A. Bentamy; L-H. Ayina; W. Drennan; A. M. Nunez, K. Katsaros, and R. Pinker. Calculation and validation of independent momentum and latent and sensible heat fluxes derived only from satellite data. Satellite Data.

yannis
Download Presentation

Satellite Data

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. Satellite-Derived Fluxes and Comparisons with NWP DataA. Bentamy; L-H. Ayina; W. Drennan; A. M. Nunez, K. Katsaros, and R. Pinker Calculation and validation of independent momentum and latent and sensible heat fluxes derived only from satellite data. WGNE-22 Meeting, Boulder 24-27 October 2006

  2. Satellite Data WGNE-22 Meeting, Boulder 24-27 October 2006

  3. Satellite Flux Groups WGNE-22 Meeting, Boulder 24-27 October 2006

  4. Gridded Satellite Flux Characteristics WGNE-22 Meeting, Boulder 24-27 October 2006

  5. Satellite Processing Scheme Data Collection Satellite / Models / In-situ • Satellite Measurements Data Analysis; Method and algorithm for Data Processing; Collocation Calibration / Validation : Wind; Humidity, Air Sea Temperatures Interaction ocean-atmosphere; Parametrization Turbulent Flux Calculations Objective Methods Flux Fields and Error Characteristics Numerical Simulations; Ocean Dynamic Impact and Process Studies WGNE-22 Meeting, Boulder 24-27 October 2006

  6. Latent Heat Flux : 1995 - 2000 WGNE-22 Meeting, Boulder 24-27 October 2006

  7. Sensible Heat Flux : 1995 - 2000 WGNE-22 Meeting, Boulder 24-27 October 2006

  8. Wind Stress : 1995 - 2000 WGNE-22 Meeting, Boulder 24-27 October 2006

  9. Accuracy Issue : Difference Sources • Raw data • Calibration / Validation Procedures • Spatial and Temporal Resolutions • Estimation of basic variables : Winds, Humidity, Sea Surface and Air Temperatures • Analysis Methods • Flux Algorithms • … In-situ / satellite Differences WGNE-22 Meeting, Boulder 24-27 October 2006

  10. Error related to the Retrieval Winds :Wind Stress Climatology from ERS-1/2 and QuikSCAT ERS : 1992 - 2001 QuikSCAT: 1999 - 2005 WGNE-22 Meeting, Boulder 24-27 October 2006

  11. Improvement of the Remotely Sensed Winds • Calibration / Validation • Inverse and Direct models (algorithms) • Parameters : Wind conditions, Sea State, Current, Rain, Stability; • Empirical correction • … Buoy / Satellite Data ERS-1ERS-2QuikSCAT ERA40 WGNE-22 Meeting, Boulder 24-27 October 2006

  12. Error related to the Objective Method Satellite Sampling Scheme • Use of simulated satellite data from buoy measurements or from ECMWF analysis • Temporal Sampling Impact : • <X> : Time - Averaged surface parameter from Hourly Buoy Data • <X’> : Time - Averaged surface parameter from Hourly Buoy Data close to satellite passes • Rms of <X> - <X’> WGNE-22 Meeting, Boulder 24-27 October 2006

  13. NDBC Buoy / Satellite Comparisons WGNE-22 Meeting, Boulder 24-27 October 2006

  14. TAO PIRATA Buoy / Satellite Comparisons WGNE-22 Meeting, Boulder 24-27 October 2006

  15. ODAS Buoy / Satellite Comparisons WGNE-22 Meeting, Boulder 24-27 October 2006

  16. Comparison Buoy /ECMWF / Satellite Winds Tropical Ocean : 10°S – 10°N ERS-1 ERS-2 ECMWF WGNE-22 Meeting, Boulder 24-27 October 2006

  17. Latitudinal Structures over the Atlantic Ocean during : 1995 – 2000 SHF LHF  WGNE-22 Meeting, Boulder 24-27 October 2006

  18. Monthly Structures over the Atlantic Ocean during : 1995 – 2000 LHF SHF  WGNE-22 Meeting, Boulder 24-27 October 2006

  19. Three Sensitivity Experiments Reference = EXP1 TForced with daily fluxes of 1994 to 1999 derived from ECMWF analysis. - SST - relaxed toward the climatology of Reynolds & Smith 1994 (RS94) - SSS - relaxed toward Levitus (1994) b - Spin-up forced during 10 years with daily mean ECMWF (1994 –1996) Second = EXP2 TForced substituting ECMWF latent heat flux by daily satellite estimates during the period 1996-1998. His initial state correspond to the EXP1 state at December 31, 1995. Third = EXP3 TForced substituting the daily satellite stress wind and latent heat flux to ECMWF estimates during the period 1996-1998. His initial state is same than EXP2. WGNE-22 Meeting, Boulder 24-27 October 2006

  20. Accuracy Issue : Forcing OGCM EXP1 X – SST RS94 and Y— Exps’ SST RS94 — Reynolds and Smith (1994) EXP2 EXP3 –— EXP1 –— EXP2 –— EXP3 … RS94 WGNE-22 Meeting, Boulder 24-27 October 2006 EXP1

  21. Summary / Perspectives / Questions(1) • 15 years of satellite fluxes are available • Resolutions • Spatial : 1°; 0.5°; 0.25°; 0.125° • Temporal : 6h; 12h; daily; Weekly; monthly, Climatology • Satellite and buoy flux estimates compare well • Satellite fluxes exhibt similar features • Satellite and model fluxes • Similar large patterns • Significant difference in magnitude WGNE-22 Meeting, Boulder 24-27 October 2006

  22. Summary / Perspectives / Questions(2) • Reprocessing of Surface Wind since 1992 (earlier?) • Re-analysis of satellite fluxes since 1992(earlier?) • Including Radiative Fluxes • Impact Analysis • MERCATOR Proposal : 50 year ocean circulation re-analysis • MERSEA project • Calculation of Blended products in near real and delayed time • Numerical Simulations using Blended data (Circulation and wave models) • Characterization of NWP and Satellite differences at global and regional scales • Archiving, Distribution, and facilities • Using New data : exp. METOP / ASCAT WGNE-22 Meeting, Boulder 24-27 October 2006

  23. Summary / Perspectives / Questions(3) How can we meet the perspectives • For operatonal Oceanography • E.U. projects : MERSEA • GMES : ? • Seaflux • Others? WGNE-22 Meeting, Boulder 24-27 October 2006

More Related