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Differences Between ASCAT, OSCAT and QuikSCAT Derived Vorticity Mark A. Bourassa and Heather Holbach Center for Ocean-Atmospheric Prediction Studies  & Department of Earth, Ocean and Atmospheric Science The Florida State University
Motivations & Approach ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Heather Holbach Mark Bourassa
Examples from the same day IGARSS 2009 IGARSS 2009 Vorticity  (10 -5  s -1 ) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],OSCAT 01Z ASCAT 12Z QSCAT 06Z
Methodology ,[object Object],[object Object],Heather Holbach Mark Bourassa ,[object Object],[object Object],[object Object],[object Object],[object Object],Ringsize 1 Ringsize 4 Ringsize 2
Methodology Heather Holbach Mark Bourassa ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Scatterometer Data ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Heather Holbach Mark Bourassa
Example of Smoothing: ASCAT 50km  averaging 100km  averaging Vorticity  (10 -5  s -1 ) Heather Holbach Mark Bourassa
Example of Smoothing: QSCAT  50km averaging 100km averaging Vorticity  (10 -5  s -1 ) Heather Holbach Mark Bourassa
Example of Smoothing: OSCAT  Vorticity  (10 -5  s -1 ) Heather Holbach Mark Bourassa 100km averaging 200km averaging
Probability Density of Vorticity (Atlantic, 40-60N) Vorticity  (10 -4  s -1 ) d Probability / d Vorticity (10 4  s) Heather Holbach Mark Bourassa
Vorticity Spectra (50km averages; 40-60N, 52-10W) Wavelength  (km) 2000  1000  750  500  250  150  100  75  50 10 -9 10 -10 10 -11 10 -12 Spectra Amplitude  (s -2 ) Heather Holbach Mark Bourassa
Probability Density of Vorticity (Atlantic, 40-60N) d Probability / d Vorticity (10 4  s) Vorticity  (10 -4  s -1 ) Heather Holbach Mark Bourassa The data density is very important for determining accurate vorticity ,[object Object],[object Object]
Tropics (10S-10N and 25W-17W d Probability / d Vorticity (10 4  s) Vorticity  (10 -4  s -1 ) Heather Holbach Mark Bourassa
Conclusions ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],Heather Holbach Mark Bourassa
Differences Between ASCAT, OSCAT and QuikSCAT Derived Vorticity IGARSS 2009 Heather Holbach and Mark A. Bourassa  Center for Ocean-Atmospheric Prediction Studies  & Department of Earth, Ocean and Atmospheric Science The Florida State University
Vorticity Spectra (100km averages) 10 -9 10 -10 10 -11 10 -12 Spectra Amplitude  (s -2 ) Wavelength  (km) 2000  1000  750  500  250  150  100  75  50 10 -13 Heather Holbach Mark Bourassa

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Bourassa_Vorticity_IGARSS.ppt

  • 1. Differences Between ASCAT, OSCAT and QuikSCAT Derived Vorticity Mark A. Bourassa and Heather Holbach Center for Ocean-Atmospheric Prediction Studies & Department of Earth, Ocean and Atmospheric Science The Florida State University
  • 2.
  • 3.
  • 4.
  • 5.
  • 6.
  • 7. Example of Smoothing: ASCAT 50km averaging 100km averaging Vorticity (10 -5 s -1 ) Heather Holbach Mark Bourassa
  • 8. Example of Smoothing: QSCAT 50km averaging 100km averaging Vorticity (10 -5 s -1 ) Heather Holbach Mark Bourassa
  • 9. Example of Smoothing: OSCAT Vorticity (10 -5 s -1 ) Heather Holbach Mark Bourassa 100km averaging 200km averaging
  • 10. Probability Density of Vorticity (Atlantic, 40-60N) Vorticity (10 -4 s -1 ) d Probability / d Vorticity (10 4 s) Heather Holbach Mark Bourassa
  • 11. Vorticity Spectra (50km averages; 40-60N, 52-10W) Wavelength (km) 2000 1000 750 500 250 150 100 75 50 10 -9 10 -10 10 -11 10 -12 Spectra Amplitude (s -2 ) Heather Holbach Mark Bourassa
  • 12.
  • 13. Tropics (10S-10N and 25W-17W d Probability / d Vorticity (10 4 s) Vorticity (10 -4 s -1 ) Heather Holbach Mark Bourassa
  • 14.
  • 15. Differences Between ASCAT, OSCAT and QuikSCAT Derived Vorticity IGARSS 2009 Heather Holbach and Mark A. Bourassa Center for Ocean-Atmospheric Prediction Studies & Department of Earth, Ocean and Atmospheric Science The Florida State University
  • 16. Vorticity Spectra (100km averages) 10 -9 10 -10 10 -11 10 -12 Spectra Amplitude (s -2 ) Wavelength (km) 2000 1000 750 500 250 150 100 75 50 10 -13 Heather Holbach Mark Bourassa