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Oceanic Whitecaps: Good or Bad?

Bridging the Gap October 21 - 22 , 2000. Oceanic Whitecaps: Good or Bad?. Magdalena Anguelova. Good or Bad for Remote Sensing. The role of whitecaps The characteristics of whitecaps Judging the whitecaps. Good or Bad for Remote Sensing. The role of whitecaps. Climate Changes.

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Oceanic Whitecaps: Good or Bad?

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  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

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