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Oceanic Whitecaps: Good or Bad? - PowerPoint PPT Presentation

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Oceanic Whitecaps: Good or Bad?

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Presentation Transcript

  1. Bridging the Gap October 21 - 22 , 2000 Oceanic Whitecaps: Good or Bad? Magdalena Anguelova

  2. Good or Bad for Remote Sensing • The role of whitecaps • The characteristics of whitecaps • Judging the whitecaps

  3. Good or Bad for Remote Sensing • The role of whitecaps

  4. Climate Changes

  5. Consequences

  6. Climate Studies • ...know past climate changes well. • ...understand present climate better. • ...predict future climate changes accurately.

  7. UV Vis IR mW Satellite Remote Sensing Parameters; Instruments; EM spectrum:

  8. UV Vis IR mW SeaWiFS Ocean Color Winter 97/98 • Water color • Presence of organisms

  9. UV Vis IR mW MODIS Aerosol Concentration • Atmospheric reflection • Presence of aerosols

  10. UV Vis IR mW AVHRR Sea Surface Temperature • Thermal emission • Temperature changes

  11. UV Vis IR mW SSM/I Wind Speed • Thermal Emission • Roughness and foam

  12. 1 1 1 1 1 0 0 1 1 1 1 1 0 1 1 1 0 1 1 1 1 Use of Data

  13. Gross Features vs. Details • Understanding; • Experience.

  14. Instrument ST Top of the atmosphere AU Ts Ocean Ts Composite Signal AD SR SU +SU ST SR +AU +AD + Ts

  15. Good or Bad for Remote Sensing • The role of whitecaps • The characteristics of whitecaps • Judging the whitecaps

  16. Good or Bad for Remote Sensing • The characteristics of whitecaps

  17. Oceanic Whitecaps • White foamy patches on a windy day

  18. UV Vis IR mW The Foam • Air/water mixture; • Dry and wet foam; • Specific properties; • Changing throughout

  19. UV Vis IR mW Whitecaps in the Visible • Bright and white! • Excellent reflectors!

  20. UV Vis IR mW Whitecaps in the Infrared • Reflectance decreases; • Some thermal emission;

  21. UV Vis IR mW Whitecaps in Microwave • Poor reflectors • Excellent emitters!

  22. UV Vis IR mW Whitecaps Signature High Reflectivity High Emissivity So-so

  23. Good or Bad for Remote Sensing • The role of whitecaps • The characteristics of whitecaps • Judging the whitecaps

  24. Good or Bad for Remote Sensing • Judging the whitecaps

  25. SU  ST– ( SR +AU + Ts) +AD + Ts) SR +SU AU ST– ( +AD SR +AU +SU) +AD Ts ST– ( Ts ST– ( SR +AU +SU) +AD Desired Signal +AU +SU +AD ST SR + Ts

  26. Ocean Color Wind speed SST Aerosols The Judgment

  27. Conclusion • Whitecaps must be accounted for; • Know well their characteristics; Questions