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OBPG Status Report

OBPG Status Report. Chuck McClain & Gene Feldman Ocean Biology Processing Group Leaders NASA Ocean Biogeochemistry Science Team Meeting April 11-13, 2006. Activities Since Last MODIS Science Team Mtg. MODIS/Aqua reprocessing 1.1 SeaWiFS Reprocessing 5.1 MODIS (Aqua & Terra) SST processing

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OBPG Status Report

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  1. OBPG Status Report Chuck McClain & Gene Feldman Ocean Biology Processing Group Leaders NASA Ocean Biogeochemistry Science Team Meeting April 11-13, 2006

  2. Activities Since Last MODIS Science Team Mtg. • MODIS/Aqua reprocessing 1.1 • SeaWiFS Reprocessing 5.1 • MODIS (Aqua & Terra) SST processing • MODIS/Aqua SST transition to OBPG completed • MODIS/Terra SST product testing completed & L-0 data copy from MODAPS underway • Evaluation products • Fluorescence Line Height – available • Calcite – evaluations ongoing (B. Balch) • MODIS/Aqua high resolution data processing • See poster by Patt, et al. • MODIS polarization modeling working group • Modeled polarization look-up table completed • Global processing test results “inconclusive” • SeaBASS • G. Fargion presentation

  3. MODIS 1.1 & SeaWiFS 5.1 Reprocessings • SeaWiFS (completed July 5)http://oceancolor.gsfc.nasa.gov/REPROCESSING/SeaWiFS/R5.1 • Switched to Thiuller solar spectrum (previously using Neckals & Labs) • Updated K(490) algorithm • Switch to TOMS V8 ozone products • Revised dimension of 9 km SMI maps • MODIS/Aqua (completed Aug. 4) http://oceancolor.gsfc.nasa.gov/REPROCESSING/Aqua/R1.1 • Modified time dependency of the radiometric calibration • Striping reduction through detector dependent radiometric correction • Updated K(490) algorithm • Switched to TOMS V8 ozone products • Revised dimension of 9 km SMI maps

  4. Activities Since Last MODIS Science Team Mtg.(Continued) • Algorithm evaluations • Chlorophyll-a workshop (J. Campbell presentation) • Nabileau-Antoine absorbing aerosol detection • Coccolithophore flag update (C. Brown) • M. Wang SWIR-based atmospheric correction & cloud masking schemes (initial phases) • Algorithm being incorporated into MODIS “HIRES” package • Spectral Optimization scheme implementation (Chesapeake Bay) • Collaboration with UMD/HPEL & U. Miami • Lee spectral Kd & quasi-analytical algorithms in SeaDAS • On-line statistics & time series • OCTS & CZCS reanalysis activities (REASoN-CAN) • Merged CZCS Level-1 data (removed duplicate data) • Nimbus-7 renavigation • OCTS time-dependent calibration revised • Merged SeaWiFS-MODIS chlorophyll-a processing • Aquarius processing

  5. Activities Since Last MODIS Science Team Mtg.(Continued) • NPP VIIRS: A continuing barrage of sensor, algorithm, and data system analyses and reviews • VIIRS sensor – W. Esaias presentation • SeaDAS • MODIS direct broadcast support • SeaDAS 4.9 release (March ’05) • >160 unique site downloads to 30 countries • Chesapeake Bay Program collaboration (consortium of state & federal agencies) • Real time products • Bay-specific algorithms • Incorporation of new processing capabilities • Spectral Optimization (TBD) • MODIS high resolution package • High resolution bands • SWIR-based atmospheric correction • NO2 correction • AERONET data for improved quality control (Smithsonian, CB tower, Smith Island-to be added)

  6. MODIS/Aqua & SeaWiFS Global Means Lwn’s (Deep Water Data Set: Common Bins) 412 nm 443 nm 490 nm SeaWiFS: 510 nm MODIS: 531 nm SeaWiFS-555 nm; MODIS-551 nm Dashed line: MODIS Solid line: SeaWiFS Deep-water: depth > 1000 m

  7. MODIS/Aqua & SeaWiFS Global MeanChlorophyll Time Series (Common Bins) Oligotrophic SeaWiFS: 0.066 MODIS: 0.056 Mesotrophic SeaWiFS: 0.25 MODIS: 0.24 Oligotrophic Ocean chl-a < 0.10 mg/m3 Mesotrophic Ocean 0.10 < chl-a < 1.0 mg/m3 Eutrophic Ocean 1.0 < chl-a < 10 mg/m3 Dashed line: MODIS Solid line: SeaWiFS Regimes based on SeaWiFS climatology Deep Water (>1000 m) SeaWiFS 0.17 MODIS 0.16 Eutrophic SeaWiFS: 2.16 MODIS: 2.38

  8. SeaWiFS Mean Global Lwn Spectra Chl-a: 0.064 0.17 0.25 2.16

  9. Refined MODIS/Aqua & SeaWiFS Global MeanChlorophyll Comparisons (Common Bins) • Revised in-band normalization algorithm plus new 3-band chlorophyll-a algorithms* * - In-band normalization scheme (Wang et al., 2001) - NOMAD-based (J. O’Reilly)

  10. MODIS/Aqua & SeaWiFS North & South PacificChlorophyll Time Series: Hemispheric Differences South Pacific, 45°S North Pacific, 45°N South Pacific, 45°S

  11. MODIS/Aqua Chlorophyll ValidationSatellite vs. In Situ Observations In Situ Statistics: • # Observations = 1293 • Range: 0.024-30.2 mg/m3 • Median ratio: 0.998 • (satellite/in situ) • Median abs. % diff: 26% In Situ Statistics: # Observations = 263 Range: 0.03-38 mg/m3 Median ratio: 1.08 (satellite/in situ) Median abs. % diff: 40.4%

  12. Lwn412 Lwn443 Lwn490 Lwn510 SeaWiFS Lwn555 Lwn670 In Situ SeaWiFS-In Situ Lwn* Match-up Comparisonshttp://seabass.gsfc.nasa.gov/matchup_results.html 412-555 Lwns: • Median ratios of satellite/in situ values all within 0.96-1.03 • Median abs. % diff less than 17% * Normalized water- leaving radiance mW/cm2µm str

  13. NO2 Sensitivity Analysis

  14. SeaWiFS & MODIS Reprocessing:If & When to Reprocess • Potential Improvements • In-band normalization update • NOMAD-based chlorophyll-a algorithms • 3-band or 4-band SeaWiFS algorithm? • Updated Rayleigh & aerosol tables • New absorbing aerosol flag • Revised coccolithophore flag thresholds • Products • Add FLH to MODIS archive suite? • Add Calcite to archive suite?

  15. OBPG Update Data Processing & Distribution

  16. Sea Surface Temperature • Approach • Aqua forward stream • Verify level-2 consistency • Binning methodology - distribute BEST quality data • GHRSST products - NASA-funded JPL activity • Aqua Mission reprocessing • Level-2/3 reprocessing for full mission complete • Full data product support on Ocean Color web and JPL-PODAAC (level-3) • MODAPS production and Goddard DAAC archive support ends when full mission available on Ocean Color web. • Transition completed March 1, 2006 for Aqua. • Repeat above steps for Terra/MODIS - underway

  17. Evaluation Products Currently, FLH and Merged MODIS/AQUA and Seawifs chlorophyll-a are being produced routinely and are available for distribution on the Level-3 web browser and ftp sites. Calcite product is being investigated. The table below shows the increase in coverage over the single mission product realized through the merging of the Aqua and SeaWiFS data sets. Day % increase over SeaWiFS = 52.8617 % increase over MODIS   = 60.0602 8-Day % increase over SeaWiFS = 20.5960 % increase over MODIS   = 24.0016 Month % increase over SeaWiFS = 4.68613 % increase over MODIS   = 5.10188 Year % increase over SeaWiFS = 0.902050 % increase over MODIS   = 0.856695

  18. Evaluation Products

  19. Evaluation Products FLH - Summer 2005

  20. Ocean Color Web Consolidated data access, information and services http://oceancolor.gsfc.nasa.gov/

  21. http://oceancolor.gsfc.nasa.gov/seadas/

  22. SeaDAS 1) Continued extensive user support predominantly via extremely active online forums (the SeaDAS-specific forum had over 1100 posts in 2005) 2) SeaDAS ported to the Macintosh OS X operating system; works on Panther (10.3) and Tiger (10.4) 3) Redesigned GUI and website are now much more user-friendly 4) New simple online installer and four SeaDAS ftp mirrors (Australia, Brazil, Japan, UK) 5) SeaDAS-lite option for display/analysis only (~50MB download) 6) Better mechanisms for syncing SeaDAS with production system.

  23. http://ocforum.gsfc.nasa.gov/forum/board_show.pl?bid=1 To Register: http://ocforum.gsfc.nasa.gov/forum/user_register.pl

  24. On-Line Mission Statisticshttp://oceancolor.gsfc.nasa.gov/cgi/smistats.pl

  25. Statistics Help Files

  26. Multi-Mission Browse and Order Page Showing Navigation Tools http://oceancolor.gsfc.nasa.gov/cgi/browse.pl?sen=am

  27. In addition to the web-based data distribution tool shown on the previous screen, there is an online repository for anonymous ftp downloads containing: 1 - the most recent 10 days of ALL MODIS/AQUA products, 2 - the complete Level-3 mission archive at multiple time/space resolutions

  28. http://oceancolor.gsfc.nasa.gov/ftp.html

  29. Ocean Color Data Distribution http://oceancolor.gsfc.nasa.gov/cgi/ocdist_stats.cgi

  30. SST Data Distribution

  31. OBPG Primary Tasks for Next Year • Complete MODIS/Terra SST processing transition from MODAPS (early summer) • Complete MODIS/Aqua HIRES module • Work on MODIS/Terra ocean color data quality • Continue analysis of VIIRS prelaunch test data & data system development • Finalize CZCS and OCTS L2 & L3 reprocessing • Continue preparations for Aquarius data processing

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