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Ocean color results for MODIS Aqua: Collection 6 evaluation

Ocean color results for MODIS Aqua: Collection 6 evaluation. Gerhard Meister a,b a: Futuretech Corp. b: OBPG (Ocean Biology Processing Group) 11/25/09 MsWG, 12/02/09. Overview. Two types of test: temporal trend (AT for Aqua, ST for SeaWiFS) and scan angle dependence (AV for Aqua)

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Ocean color results for MODIS Aqua: Collection 6 evaluation

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  1. Ocean color results for MODIS Aqua: Collection 6 evaluation Gerhard Meistera,b a: Futuretech Corp. b: OBPG (Ocean Biology Processing Group) 11/25/09 MsWG, 12/02/09

  2. Overview • Two types of test: temporal trend (AT for Aqua, ST for SeaWiFS) and scan angle dependence (AV for Aqua) • Three LUTs will be compared: operational (V5.0.37.1b for coll. 6 code, AT42, AV09), standard collection 6 (V6.1.5.0, AT44, AV10) and ALT (V6.1.5.0_ALT, AT45, AV11) • AT44 shows improvement for band 14 (important for FLH), band 8 got worse • AV10 improves scan angle dependency for 547 at the end of the mission, but worse for 443 at the end • AT45 shows improvement at the end, but overall downward trend remains unchanged • Only a few selected plots will be shown here, all plots are available at oceancolor.gsfc.nasa.gov/ANALYSIS/global/

  3. Trends of chlor-a in olig. water:

  4. Trends of Rrs 547nm in olig. water:

  5. Trends of Rrs 443nm in olig. water:

  6. Trends of Rrs 412nm in olig. water:

  7. Trends of FLH bands (13 and 14):

  8. RVS for nLw 547nm (op.):

  9. RVS for nLw 547nm (coll. 6):

  10. RVS for nLw 443nm (op. and coll.6):

  11. RVS for nLw 412nm (op. and coll. 6):

  12. RVS for nLw 412nm (coll. 6 and ALT):

  13. RVS for AOT (op. and coll. 6):

  14. RVS for Angstrom (op. and coll. 6):

  15. Summary • Collection 6 LUT improves temporal trends for longer wavelengths (500-700nm); significant improvement for FLH • Collection 6 standard LUT increases trend seen for 412nm Rrs, ALT version provides only small improvement at the end of mission for temporal trend, significant improvement for RVS at end of mission • Striping is generally worse for collection 6 LUTs • Path forward: MCST will deliver collection 6 LUTs with detector trends using collection 5 methodology, OBPG will vicariously calibrate band 8 using SeaWiFS

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