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Validation of Chlorophyll Fluorescence Derived from MERIS on the West Coast of Canada

Validation of Chlorophyll Fluorescence Derived from MERIS on the West Coast of Canada. Jim Gower and Stephanie King IOS, Sidney BC, Canada gowerj@pac.dfo-mpo.gc.ca MERIS Users Workshop, Nov 10-13 2003 ESRIN, Frascati, Italy. MERIS image data received Vancouver Island, west coast Canada.

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Validation of Chlorophyll Fluorescence Derived from MERIS on the West Coast of Canada

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  1. Validation of Chlorophyll Fluorescence Derived from MERIS on the West Coast of Canada Jim Gower and Stephanie King IOS, Sidney BC, Canada gowerj@pac.dfo-mpo.gc.ca MERIS Users Workshop, Nov 10-13 2003 ESRIN, Frascati, Italy

  2. MERIS image data receivedVancouver Island, west coast Canada • 50 L1 RR images in 2002, starting May 17 • 50 L1 RR images in 2003 to end August • Latest to Oct 2 • 100/157 possible, about 40 “usable” • Level 2: 42 in 2002, 10 in 2003 to Aug 31 • FR data for only 9 dates (8 usable)

  3. Above-surface reflectance spectra observed off Vancouver Island with the IOS spectrometer. 1 and 16 mg.m-3 chlorophyll. MERIS bands 1 to 12 plotted

  4. MERIS bands (Web)

  5. MERIS FLH from L1 August 14 2002

  6. MODIS fluorescence Aug 14, 2002 Level 2 data

  7. Seawifs chlorophyll image 14 Aug 2002 (IOS web)

  8. “True” (2,5,7) Algal 1MERIS FR data 28 June 2003

  9. FLH (7,8,9) RTI (8,9,10)MERIS FR data 28 June 2003

  10. Variation of Fluorescence with Chlorophyll Concentration (C) Solid line: Fluorescence = 0.15 C / (1+0.2 C) compared to Babin et al. (1996) dashed line. (0.2 C is ratio of absorption of fluorescence by chlorophyll to absorption by pure water).

  11. Comparison of MERIS FLH with IOS cruise 2002-30 (August 25 to 27 2002) surface extracted chlorophyll at stations in Juan de Fuca Strait and off Vancouver Island

  12. Surface extracted chlorophylls from all of the IOS cruise 0302 stations from Feb 24th to Feb 28th compared with Meris FLH for Feb. 24th and 27th, 2003 (waters off Vancouver Island, Canada)

  13. MERIS FLH / Surface data comparisonsFLH=a+bC/(1+0.2C)

  14. Best fit of MERIS FLH with Chlorophyll in 6 data sets model

  15. MERIS Algal 1 (top) and FLH (bottom) Sept 21 2002

  16. MERIS FLH, Sept 21 2002 with regions A to H

  17. A: VI coastal

  18. B: west lobe

  19. C: east lobe

  20. D: Washington coast

  21. E: Saanich Inlet

  22. F: Fraser Plume

  23. G: Strait of Georgia

  24. Characteristic vectors derived from area B (120 by 120) of Sept 21 2002 L1 RR data (Wei Yan)

  25. MERIS MODIS MERIS sees 1.39 +/- .10 times MODIS. Expect 1.35 due to band locations.Range is 0.4 compared to 0.25, W.m-2.mm-1.ster-1

  26. Reduced resolution (1200m) Full resolution (300m) MERIS FLH images, comparing full and reduced resolutions in part of the July 10 2002 scene

  27. Comparing full and reduced resolution MERIS FLH in part of the July 10 2002 scene

  28. Conclusions • Fluorescence patterns show up well along the BC coast • Fluorescence signal is reasonably consistent with surface chlorophyll • MODIS/MERIS ratio = 1.35. • FR data should be useful for biomass mapping in inlets, especially for small, intense events. • Modified MERIS bands should be used to study the 650 to 720 spectral region

  29. MERIS observations with a modified spectral band set (AO 612) This is a major capability of MERIS which has yet to be adequately demonstrated MERIS can bring added resolution to the 660 to 720 nm chlorophyll fluorescence/absorption/red edge region of the spectrum, providing brief periods of global coverage. Disruption of the standard observations would be no worse than occur regularly for meteor showers and equipment/logistic failures. MODIS, the alternative satellite sensor, lacks this ability.

  30. Spectral band positions and widths providing contiguous coverage of the wavelength range 650 to 723.5 nm with a resolution of 7.5 to 10 nm. Two days of global data required for each of Jan/Feb and July/Aug. MERIS altered band set (AO612)

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