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8th IOCCG Meeting in Florence, Italy (24-26 Feb 03)

Current Status of MODIS (Terra and Aqua) by Chuck Trees for the MODIS Team Members . 8th IOCCG Meeting in Florence, Italy (24-26 Feb 03). Brief MODIS History. Definition Panel 1984 Selection of Instrument, Instrument Team - 1989 Restructuring - 1992

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8th IOCCG Meeting in Florence, Italy (24-26 Feb 03)

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  1. Current Status of MODIS (Terra and Aqua) by Chuck Trees for the MODIS Team Members 8th IOCCG Meeting in Florence, Italy (24-26 Feb 03)

  2. Brief MODIS History • Definition Panel 1984 • Selection of Instrument, Instrument Team - 1989 • Restructuring - 1992 • MODIS-T out, PM MODIS-N in (6 MODIS-N’s) • Major budget reduction - 1997 • Addition of team member investigations • DIS rescope • 6 platforms reduced to 1st 2 - AM-1, PM-1 • LaunchTerra 12/1999 • Launch Aqua 5/2002 • Re-compete team in mid 2003

  3. TERRA MODIS NIGHTTIME 4mm SST MAY 2001 V 3.3.1 -2 5 10 15 20 25 30 35 Co MODIS/OCEAN GROUP GSFC, RSMAS

  4. MODIS SST Buoy and M-AERI retrieval StatisticsVersion 4.5 (new delivery)median = satellite - reference [MAERI or BUOY]BUOY M-AERI • SST - new coefficients • Median StdDev Number • of Points • Terra all 0.10 0.40 439 • Terra night 0.04 0.35 235 • Terra day 0.16 0.42 204 • Aqua all 0.06 0.40 105 • Aqua night 0.02 0.37 59 • Aqua day 0.11 0.45 46 • SST4 new coeffs, new formulation • Terra night 0.02 0.34 278 • Aqua night -0.01 0.31 52 • SST - new coefficients Median StdDev Number of Points • Terra all -0.07 0.48 11027 • Terra night 0.01 0.42 4387 • Terra day -0.14 0.51 6643 • Aqua all -0.05 0.48 3821 • Aqua night -0.10 0.43 1628 • Aqua day -0.01 0.51 2203 • SST4 new coeffs, new formulation • Terra night -0.05 0.41 4096 • Aqua night -0.10 0.39 1319

  5. AQUA, TERRA combined orbits nearly eliminate swath gapsComposite AQUA, TERRA SST Night Sept 29, 2002

  6. Nearly Complete Single Day Global CoverageComposite Night (MODIS-T, MODIS-A) Day, Night - (AMSR, TMI) Prototype Sept 29, 2002, 0.25O spatial resolution Kyle

  7. MODIS Ocean Products • MODIS Instruments: • Terra (1030 morning), • Aqua (1330 afternoon) • 40 products: • 4 SST, • 36 Ocean Color • Resolution: • Spatial: • Level 2 - 1km, ~2000km x 2000km; • Level 3 - 4km, 36km, 1 deg [all products are global] • Temporal Resolution: • Level 2 - 5 minute granule; • Level 3 - daily, 8 day week, monthly, yearly

  8. MODIS Ocean data products • There are 86 ocean parameters available in over 100 categories of MODIS Ocean data types archived by (and may be obtained from) the NASA Goddard Distributed Active Archive Center. • The three basic groupings of MODIS ocean data parameters are: • ocean color • sea surface temperature • ocean primary production • Ocean Parameter categories: • 36 Ocean Color parameters • 4 Sea Surface Temperature parameters • 8 Primary Productivity parameters • (including 2 Primary Production indices) • 38 Quality Control parameters.

  9. Future Data Releases • Next reprocessing Terra Collection 4 in May 2003 1. Calibration issues and discontinuities will be corrected for time period of Sept. 2001 - Dec 2002 • Next reprocessing (TERRA Collection 5) • New cross-scan normalization based on individual detectors. This improves detector gain stability across the scan, thereby improving stripe removal. • Sun glint correction using vector winds to improve the east-west adjacent swath edge consistency. • Ocean BRDF correction • Combined Terra and Aqua products

  10. TERRA Collection 4

  11. AQUA Collection 3

  12. Merged Terra, Aqua, SeaWiFS Chlor_a_2 January 19, 2003 full time series available in SeaWiFS 9km format http://jeager.gsfc.nasa.gov/browsetool/

  13. 2000 2001 2002 Valid period 305-800

  14. Comparison of MODIS Chlorophyll ProductsJune 2001Chlor_a_2 Chlor_a_3 (empirical) (semi-analytical) Note that Chlor_a_3 results are similar for northern subtropics, but higher north of 40o N and for upwelling areas, where it has adjusted to higher-nutrient effects.

  15. Independent Validation Study Gregg and Casey, in progress NODC + SeaBASS, L-3 4.6km Quality Level 0, 1 Chlor_a_2 virtually identical performance as for SeaWiFS r2 = 0.757 n=1.6K vs 0.759 n>4.5K Semi-analytic Chlor_a_3 shows improvement r2 = 0.784 Regional analysis is underway. Chlor-MODIS Chlor_a_2 Chlor_a_3 Watson Gregg & Nancy McCabe

  16. OCEAN PRODUCTIVITY from MODIS : A New Baseline Global average Validated data period Above: Mixed layer Ocean Production Index P2 Standard MODIS Product Collection 4 South Atlantic 10S° to 50°S Esaias et al. Poster: Compares Ocean Production using MODIS, SeaWiFS, different chlorophyll algorithms two production models MODIS Semi-analytic chlorophyll results in 2 x greater production in the key Southern Ocean regions, and phase differences, global total between 57 and 59 GT C. SeaWiFS/MODIS differences are relatively small. Antarctic, S of 50°S Terra ONPP time series using chlorophyll from SeaWiFS (green), MODIS Chlor_a_2(SeaWiFS analog) (black), Chlor_MODIS(red), MODIS Chlor_a_3 Semi-analytic chlorophyll(blue) for global and 2 SO regions.

  17. Weekly FLH

  18. Weekly Productivity (P1)

  19. (From Frank Hoge and Paul Lyon)

  20. FLH vs. chlorophyll FLH vs. CDOM

  21. Where to get data and more information Information locations: MODIS Oceans home page • http://modis-ocean.gsfc.nasa.gov MODIS Oceans QA Browse 36km Imagery (MQABI) • http://jeager.gsfc.nasa.gov/browsetool/ Select Terra collection 4 Useful links to documentation and related web pages • http://modis-ocean.gsfc.nasa.gov/doclinks.html Data Ordering locations: NASA GES DAAC WHOM (NASA - Goddard DAAC) http://daac.gsfc.nasa.gov/ • Select Ocean color ->MODIS->ocean EOS DATA GATEWAY EDG - http://modis.gsfc.nasa.gov/data/ordering.html

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