EVALUATIONS OF WIND VECTORS OBSERVED BY ASCAT USING STATISTICAL DISTRIBUTIONS

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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]

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]

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

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

3. Monthly Report on Buoy Comparison by KNMI

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.

24. Comparison of wind speed

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.

EVALUATIONS OF WIND VECTORS OBSERVED BY ASCAT USING STATISTICAL DISTRIBUTIONS

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