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Ocean color and SST data product validation

Ocean color and SST data product validation. NASA Ocean Biology Processing Group Goddard Space Flight Center, Greenbelt, Maryland, USA SeaDAS Training Material. Ocean color level-2 match-ups using SeaBASS data. SeaWiFS Sept 1997 - Present. MODIS-Aqua July 2002 - Present.

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Ocean color and SST data product validation

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  1. Ocean color and SST data product validation NASA Ocean Biology Processing Group Goddard Space Flight Center, Greenbelt, Maryland, USA SeaDAS Training Material SeaDAS Training ~ NASA Ocean Biology Processing Group

  2. Ocean color level-2 match-ups using SeaBASS data SeaWiFSSept 1997 - Present MODIS-AquaJuly 2002 - Present color key: valid matchexcluded “match-up” defined as: (1) in situ measurement collected within +/- 3 hours of satellite overpass (2) 5x5 satellite pixel box centered on in situ lat/lon target (3) homogeneity and sensor/solar geometry tests applied (4) filtered median of valid (non-flagged) pixels, if >50% remain SeaDAS Training ~ NASA Ocean Biology Processing Group

  3. Comparison of coincident satellite and in situ nLw() MODIS-Aqua SeaWiFS SeaDAS Training ~ NASA Ocean Biology Processing Group

  4. Comparison of coincident satellite and in situ Chl MODIS-Aqua SeaWiFS Bailey and Werdell, Rem. Sens. Environ.102, 12-23 (2006) http://seabass.gsfc.nasa.gov/matchup_results.html SeaDAS Training ~ NASA Ocean Biology Processing Group

  5. Ocean color level-3 validation • Level-2 match-ups are sparse and do not provide detailed temporal (e.g., seasonal) or spatial (e.g., latitudinal, along scan, across detectors) statistics. • Level-3 sensor-to-sensor comparisons provide some insight into such temporal and spatial behavior. • Data are prepared by … • binning globally at selected spatial resolution (4.6 or 9-km) • binned at equal time intervals (4- or 8-days from the start of each consecutive 32-day period) • identifying common bins for both sensors Chl, 9-km 8-day common deep-water bins April-2006 MODIS-Aqua SeaWiFS 0.01 mg m-3 1 mg m-3 SeaDAS Training ~ NASA Ocean Biology Processing Group

  6. Definition of Level-3 trophic subsets deep water (depth > 1000 m) oligotrophic (Chl < 0.1 mg m-3) eutrophic (1 < Chl < 10 mg m-3) mesotrophic (0.1 < Chl < 1 mg m-3) SeaDAS Training ~ NASA Ocean Biology Processing Group

  7. nLw() temporal trends deep water, 4-day composites MODIS-Aqua SeaWiFS 412 nm 412 nm 443 nm 443 nm 488 nm 490 nm 510 nm 531 nm 555 nm 551 nm 1998 2006 2003 2006 SeaDAS Training ~ NASA Ocean Biology Processing Group

  8. Comparison of relative temporal stability of nLw() deep water, 4-day composites, common bins MODIS-Aqua SeaWiFS SeaDAS Training ~ NASA Ocean Biology Processing Group

  9. MODIS-Aqua / SeaWiFS ratio trends oligotrophic mesotrophic eutrophic nLw() ratios Chl ratios SeaDAS Training ~ NASA Ocean Biology Processing Group

  10. oligotrophic mesotrophic eutrophic Comparison of spectral distribution trends MODIS-Aqua & SeaWiFS mean nLw() SeaDAS Training ~ NASA Ocean Biology Processing Group

  11. Seasonal Chl images MODIS-Aqua SeaWiFS Winter 2004 Winter 2004 Summer 2004 Summer 2004 • 0.01-64 mg m-3 SeaDAS Training ~ NASA Ocean Biology Processing Group

  12. SST validation buoy measurements SeaDAS Training ~ NASA Ocean Biology Processing Group

  13. References Ocean color level-2 match-ups http://seabass.gsfc.nasa.gov/matchup_results.html S.W. Bailey and P.J. Werdell, Rem. Sens. Environ.102, 12-23 (2006) Ocean color level-3 validation B.A. Franz et al., Proc. SPIE 5882, 304-316 (2005) SST validation and match-up database K.A. Kilpatrick et al., J. Geophys. Res. 106, 9179-9197 (2001) SeaDAS Training ~ NASA Ocean Biology Processing Group

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