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 -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

MODIS 1.1 & SeaWiFS 5.1 Reprocessings SeaWiFS (completed July 5) -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) -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

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

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 NO 2 correction AERONET data for improved quality control (Smithsonian, CB tower, Smith Island-to be added)

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

MODIS/Aqua & SeaWiFS Global Mean Chlorophyll Time Series (Common Bins) Oligotrophic Ocean chl-a < 0.10 mg/m 3 Mesotrophic Ocean 0.10 < chl-a < 1.0 mg/m 3 Eutrophic Ocean 1.0 < chl-a < 10 mg/m 3 Oligotrophic SeaWiFS: MODIS: Mesotrophic SeaWiFS: 0.25 MODIS: 0.24 Eutrophic SeaWiFS: 2.16 MODIS: 2.38 Dashed line: MODIS Solid line: SeaWiFS Regimes based on SeaWiFS climatology Deep Water (>1000 m) SeaWiFS 0.17 MODIS 0.16

SeaWiFS Mean Global Lwn Spectra Chl-a:

Refined MODIS/Aqua & SeaWiFS Global Mean Chlorophyll 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) DeepOligoMesoEutrophic MODIS SeaWiFS Ratio

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

MODIS/Aqua Chlorophyll Validation Satellite vs. In Situ Observations In Situ Statistics: # Observations = 263 Range: mg/m 3 Median ratio: 1.08 (satellite/in situ) Median abs. % diff: 40.4% In Situ Statistics: # Observations = 1293 Range: mg/m3 Median ratio: (satellite/in situ) Median abs. % diff: 26%

SeaWiFS-In Situ Lwn* Match-up Comparisons * Normalized water- leaving radiance mW/cm 2 µm str Lwn412Lwn443 Lwn490Lwn510 Lwn555Lwn670 SeaWiFS In Situ Lwns: Median ratios of satellite/in situ values all within Median abs. % diff less than 17%

NO 2 Sensitivity Analysis

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?

OBPG Update Data Processing & Distribution

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

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 = % increase over MODIS = Day% increase over SeaWiFS = % increase over MODIS = Month% increase over SeaWiFS = % increase over MODIS = Year% increase over SeaWiFS = % increase over MODIS =

Evaluation Products

FLH - Summer 2005

Ocean Color Web Consolidated data access, information and services

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.

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On-Line Mission Statistics

Statistics Help Files

Multi-Mission Browse and Order Page Showing Navigation Tools

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

Ocean Color Data Distribution

SST Data Distribution

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