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Evaluation of Wind Vectors observed by ASCAT using Statistical Distributions ,[object Object],[object Object],[object Object],MetOp-A
Outline ,[object Object],[object Object],[object Object],[object Object],[object Object]
Monthly Report on Buoy Comparison by KNMI
Buoy Data for Comparison with ASCAT ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],NDBC NDBC TAO PIRATA KEO RAMA WHOI
Comparison of ASCAT Winds with Buoy Data ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Calculation of Global Statistics of ASCAT Wind Speeds and Directions ,[object Object],[object Object],[object Object],[object Object],[object Object]
ASCAT Global Wind Speed Histograms ,[object Object],[object Object],[object Object]
ECMWF Wind Speed Histograms ,[object Object]
Statistics of ASCAT Wind Speed Distribution ASCAT NWP
Statistics of ASCAT Wind Speed Distribution ASCAT NWP 12.5 km Product
ASCAT Wind Direction Histograms Left Swath,  Wind Speed Range: 7-9 m/s, Descending Paths WVC# 1-3 WVC# 4-6 WVC# 7-9 WVC# 10-12 WVC# 13-15 WVC# 16-18 WVC# 19-21 ECMWF ASCAT
Normalized ASCAT Wind Direction Histograms WVC# 1-3 WVC# 4-6 WVC# 7-9 WVC# 10-12 WVC# 13-15 WVC# 16-18 WVC# 19-21 Descending Ascending Normalized (ASCAT/NWP),   Left Swath,  Wind Speed Range: 7-9 m/s
Wind Speed Dependence of Normalized Wind Direction Histograms (Outer Cells) Normalized (ASCAT/NWP),   WVC#: 1-3 (Left Outer Swath) Descending Ascending 3-5 m/s 5-7 m/s 7-9 m/s 9-11 m/s 11-13 m/s 13-15 m/s
Wind Speed Dependence of Normalized Wind Direction Histograms (Mid Cells) Normalized (ASCAT/NWP),   WVC#: 10-12 (Left Mid Swath) Descending Ascending 3-5 m/s 5-7 m/s 7-9 m/s 9-11 m/s 11-13 m/s 13-15 m/s
Wind Speed Dependence of Normalized Wind Direction Histograms (Inner Cells) Normalized (ASCAT/NWP),   WVC#: 19-21 (Left Inner Swath) Descending Ascending 3-5 m/s 5-7 m/s 7-9 m/s 9-11 m/s 11-13 m/s 13-15 m/s
Applications to data  from Oceansat-II scatterometer Oceansat-II Scatteromter (OSCAT) Ku-band (13.51 GHz) Scanning dual pencil beam VV and HH pol 50 km resolution 1800 km swath
Comparison of  OSCAT  Winds with Buoy Data ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
OSCAT  Global Wind Speed Histograms ,[object Object],[object Object],[object Object]
ECMWF Wind Speed Histograms ,[object Object]
Statistics of  OSCAT  Wind Speed Distribution OSCAT Asc NWP OSCAT Dec ECMWF Asc ECMWF Dec
OSCAT  Wind Direction Histograms Left Swath,  Wind Speed Range: 7-9 m/s, Ascending Paths WVC# 1-3 WVC# 4-6 WVC# 7-9 WVC# 13-15 WVC# 16-18 WVC# 10-12 ECMWF OSCAT
Summary ,[object Object],[object Object],[object Object],[object Object],[object Object]
 
Comparison of wind speed
Residuals of Wind Speed and Direction
Residuals of Wind Speed and Direction   Binning wind speed = (U buoy  + U scat )/2
Dependence of Wind Speed Residual on Wave Parameter Significant Wave Height Inverse Wave Age Correlation Coefficient = 0.300 Correlation Coefficient = -0.311
Comparison of wind speed OSCAT
Residuals of Wind Speed and Direction   Binning wind speed = (U buoy  + U scat )/2 OSCAT
Statistics of  NSCAT  Wind Speed Distribution ASCAT ASCAT ASCAT ASCAT (Ebuchi,  J. Oceanogr ., 2000)
Statistics of  QSCAT  Wind Speed Distribution ASCAT ASCAT ASCAT ASCAT Ascending Descending
Histograms of  ERS-1  Wind Directions CMOD-4 CMOD-IFR2 (Ebuchi & Graber,  JGR , 1998)
Histograms of  NSCAT  Wind Directions (Ebuchi,  JGR , 1999)
Histograms of  QSCAT  Wind Directions (Ebuchi,  Proc. IGARSS 2000 , 2000)
Rough estimation of incidence angle error   ,[object Object],[object Object],[object Object],[object Object],[object Object]

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EVALUATIONS OF WIND VECTORS OBSERVED BY ASCAT USING STATISTICAL DISTRIBUTIONS

  • 1.
  • 2.
  • 3. Monthly Report on Buoy Comparison by KNMI
  • 4.
  • 5.
  • 6.
  • 7.
  • 8.
  • 9. Statistics of ASCAT Wind Speed Distribution ASCAT NWP
  • 10. Statistics of ASCAT Wind Speed Distribution ASCAT NWP 12.5 km Product
  • 11. ASCAT Wind Direction Histograms Left Swath, Wind Speed Range: 7-9 m/s, Descending Paths WVC# 1-3 WVC# 4-6 WVC# 7-9 WVC# 10-12 WVC# 13-15 WVC# 16-18 WVC# 19-21 ECMWF ASCAT
  • 12. Normalized ASCAT Wind Direction Histograms WVC# 1-3 WVC# 4-6 WVC# 7-9 WVC# 10-12 WVC# 13-15 WVC# 16-18 WVC# 19-21 Descending Ascending Normalized (ASCAT/NWP), Left Swath, Wind Speed Range: 7-9 m/s
  • 13. Wind Speed Dependence of Normalized Wind Direction Histograms (Outer Cells) Normalized (ASCAT/NWP), WVC#: 1-3 (Left Outer Swath) Descending Ascending 3-5 m/s 5-7 m/s 7-9 m/s 9-11 m/s 11-13 m/s 13-15 m/s
  • 14. Wind Speed Dependence of Normalized Wind Direction Histograms (Mid Cells) Normalized (ASCAT/NWP), WVC#: 10-12 (Left Mid Swath) Descending Ascending 3-5 m/s 5-7 m/s 7-9 m/s 9-11 m/s 11-13 m/s 13-15 m/s
  • 15. Wind Speed Dependence of Normalized Wind Direction Histograms (Inner Cells) Normalized (ASCAT/NWP), WVC#: 19-21 (Left Inner Swath) Descending Ascending 3-5 m/s 5-7 m/s 7-9 m/s 9-11 m/s 11-13 m/s 13-15 m/s
  • 16. Applications to data from Oceansat-II scatterometer Oceansat-II Scatteromter (OSCAT) Ku-band (13.51 GHz) Scanning dual pencil beam VV and HH pol 50 km resolution 1800 km swath
  • 17.
  • 18.
  • 19.
  • 20. Statistics of OSCAT Wind Speed Distribution OSCAT Asc NWP OSCAT Dec ECMWF Asc ECMWF Dec
  • 21. OSCAT Wind Direction Histograms Left Swath, Wind Speed Range: 7-9 m/s, Ascending Paths WVC# 1-3 WVC# 4-6 WVC# 7-9 WVC# 13-15 WVC# 16-18 WVC# 10-12 ECMWF OSCAT
  • 22.
  • 23.  
  • 25. Residuals of Wind Speed and Direction
  • 26. Residuals of Wind Speed and Direction Binning wind speed = (U buoy + U scat )/2
  • 27. Dependence of Wind Speed Residual on Wave Parameter Significant Wave Height Inverse Wave Age Correlation Coefficient = 0.300 Correlation Coefficient = -0.311
  • 28. Comparison of wind speed OSCAT
  • 29. Residuals of Wind Speed and Direction Binning wind speed = (U buoy + U scat )/2 OSCAT
  • 30. Statistics of NSCAT Wind Speed Distribution ASCAT ASCAT ASCAT ASCAT (Ebuchi, J. Oceanogr ., 2000)
  • 31. Statistics of QSCAT Wind Speed Distribution ASCAT ASCAT ASCAT ASCAT Ascending Descending
  • 32. Histograms of ERS-1 Wind Directions CMOD-4 CMOD-IFR2 (Ebuchi & Graber, JGR , 1998)
  • 33. Histograms of NSCAT Wind Directions (Ebuchi, JGR , 1999)
  • 34. Histograms of QSCAT Wind Directions (Ebuchi, Proc. IGARSS 2000 , 2000)
  • 35.