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OBPG Status Report

The Ocean Biology Processing Group (OBPG) leaders, Chuck McClain and Gene Feldman, provided a comprehensive update during the Carbon Cycle & Ecosystems Joint Science Team Meeting on May 1, 2008. Key topics included mission support for SeaWiFS, MODIS/Aqua, and MODIS/Terra, addressing historical data, sensor performance, and recent telemetry issues. The report highlighted the impact of orbit drift on calibration, proposed updates to algorithms, new product candidates, and recent refereed publications on ocean color radiometry and vicarious calibration techniques.

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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 Carbon Cycle & Ecosystems Joint Science Team Meeting Ocean Breakout Session May 1, 2008

  2. OBPG Data Set & Mission Support Activities • SeaWiFS • MODIS/Aqua: Ocean Color & SST* • MODIS/Terra: Ocean Color & SST* • NPP/VIIRS: Ocean Color & SST • Sensor & EDR algorithm performance • Launch in 2010 • Aquarius (data system): Launch in 2010 • Historical data • CZCS • OCTS • Sensor & mission concept development • Ocean Radiometer for Carbon Assessment (ORCA) • Aerosols, Clouds, Ecology (ACE) *Primarily data processing & distribution

  3. SeaWiFS • Internal telemetry anomaly on Spacecraft on Dec. 31, 2007 • Resulted in loss of GPS and attitude data in downlinked data stream. • SeaWiFS instrument unaffected • Data could not be processed • GeoEYE recovery plan • Switch to the B-side computer: imaging on March 11 for 1 day. • Spurious GPS position caused the spacecraft safehold. • Return to "nominal" imaging operations was restored on April 4 and continues. • Current status • The GPS receiver has intermittent autonomous resets • Results in time shifts in the data stream & navigation failures • Approximately 30% of the GAC orbits affected • Discussions underway with GeoEye to identify source of problem • Option for 1 year of GAC exercised on April 12. • The NOAA data buy for HRPT coverage of U.S. coastal waters not being renewed. • Orbit drift impacting calibration (presumably thermal sensitivity) • Effects evident in lunar calibration

  4. SeaWiFS Orbit Drift

  5. Reprocessing: Primary Improvements • CZCS, OCTS, SeaWiFS, MODIS (Terra & Aqua) • Revise band centers & related algorithms • E.g., MODIS 551 nm band center to 547 nm • Switch to K(490) based on Morel or Lee • Update aerosol models based on AERONET analyses • NO2 corrections using global NO2 satellite products • MODIS/Terra • Updated on-board calibration • SeaWiFS-based vicarious calibration of polarization & RVS • Franz presentation later provides details • MODIS/Aqua • Updated on-board calibration • SeaWiFS • Revised prelaunch and lunar calibrations • Expand glint and straylight masks • Update PAR and calcite algorithms Candidate new products: POC (Stramski) PAR (Frouin): MODIS Lwn(678): MODIS FLH: MODIS Euphotic depth (Lee) Kpar (Morel)

  6. OBPG Refereed Publications • Eplee, R. E., F. S. Patt, R. A. Barnes, and C. R. McClain, SeaWiFS long-term solar diffuser reflectance and sensor signal-to-noise analyses, Appl. Opt., 46(5), 762-773, 2007. • Franz, B. A., S. W. Bailey, P. J. Werdell, and C. R. McClain, Sensor-independent approach to the vicarious calibration of satellite ocean color radiometry, Appl. Opt., 46(22), 5068-5082, 2007. • Ahmad, Z., C. R. McClain, J. R. Herman, B. A. Franz, E. J. Kwaitkowska, W. D. Robinson, E. J. Bucsela, and M. Tzortziou, Atmospheric correction of NO2 in retrieving water-leaving reflectances from the SeaWiFS and MODIS measurements, Appl. Opt., 46(26), 6504-6512, 2007. • Werdell, P. J., S. W. Bailey, B. A. Franz, A. Morel, C. R. McClain, and S. B. Hooker, The on-orbit vicarious calibration of ocean color sensors using a sea surface reflectance model, Appl. Opt., 46(23), 5649-5666, 2007. • Eplee, R. E., Jr., F. S. Patt, B. A. Franz, S. W. Bailey, G. Meister, C. R. McClain, SeaWiFS on-orbit gain and detector calibrations: impact on ocean products, Appl. Opt., 46(27). 6733-6750, 2007. • Gordon, H. R., B. A. Franz, Remote sensing of ocean color: Assessment of the water-leaving radiance bidirectional effects on the atmospheric diffuse transmittance for SeaWiFS and MODIS intercomparisons, Remote Sens. Environ., 112, 2677-2685, 2008. • Bailey, S. W., S. B. Hooker, D. Antoine, B. A. Franz, and P. J. Werdell, Sources and assumptions for the vicarious calibration of ocean color satellite observations, Appl. Opt. 47, 2035-2045, 2008. • Franz, B. A., E. J. Kwiatkowska, G. Meister, and C. R. McClain, Moderate Resolution Imaging Spectroradiometer on Terra: Limitations for Ocean Color Applications, J. Appl. Remote Sens., in press.

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