# Presentation: 896360

## 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

**Notes:**
 monitoring harmful blooms from space gives coastal communities ability to take precautionary measures
 fishing bans
 beach closures
 image shows true color (top) and chlorophyll (bottom)  views of bloom in mouth of Mississippi
 similar information was used to monitor a red tide bloom off coast of Texas last fall

## 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

**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

## Activities Since Last MODIS Science Team Mtg.(Continued)

**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)

**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)

## MODIS/Aqua & SeaWiFS Global Means Lwn’s (Deep Water Data Set: Common Bins)

**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)

**MODIS/Aqua & SeaWiFS Global Mean**** ****Chlorophyll Time Series (Common Bins)**

- 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

- Oligotrophic
- SeaWiFS: 0.066
- MODIS:   0.056

- 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:
- 0.064

- 0.17

- 0.25

- 2.16

## 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)

|  | Deep | Oligo | Meso | Eutrophic |
| --- | --- | --- | --- | --- |
| MODIS | 0.160 | 0.052 | 0.231 | 2.107 |
| SeaWiFS | 0.167 | 0.060 | 0.240 | 2.133 |
| Ratio | 0.956 | 0.871 | 0.962 | 1.002 |

## MODIS/Aqua & SeaWiFS North & South PacificChlorophyll Time Series: Hemispheric Differences

**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: 0.03-38 mg/m****3**
**   ****Median ratio: 1.08**
**      ****(satellite/in situ)**
**   ****Median abs. % diff: 40.4%**

**In Situ Statistics:**
**   ****# Observations = 1293**
**   ****Range: 0.024-30.2 mg/m3**
**   ****Median ratio: 0.998**
**      ****(satellite/in situ)**
**   ****Median abs. % diff: 26%**

## SeaWiFS-In Situ Lwn* Match-up Comparisonshttp://seabass.gsfc.nasa.gov/matchup_results.html

- * Normalized water-
-    leaving radiance
-     mW/cm2 μm str

- 412-555 Lwns:
-  Median ratios of
- satellite/in situ values
- all within 0.96-1.03
-  Median abs. % diff
- less than 17%

## NO2 Sensitivity Analysis

**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 = 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

## Evaluation Products

## Evaluation Products

- FLH - Summer 2005

## Ocean Color 

- Web
- Consolidated
- data access, information
- and services

- http://oceancolor.gsfc.nasa.gov/

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

## 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.

## http://ocforum.gsfc.nasa.gov/forum/board_show.pl?bid=1

- _[http://ocforum.gsfc.nasa.gov/forum/board_show.pl?bid=1](http://ocforum.gsfc.nasa.gov/forum/board_show.pl?bid=1)_
- To Register: http://ocforum.gsfc.nasa.gov/forum/user_register.pl

## On-Line Mission Statisticshttp://oceancolor.gsfc.nasa.gov/cgi/smistats.pl

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

## Slide 25

## Statistics Help Files

**Statistics Help Files**

## Multi-Mission Browse and Order Page Showing Navigation Tools

**Multi-Mission Browse and Order Page Showing Navigation Tools**

- http://oceancolor.gsfc.nasa.gov/cgi/browse.pl?sen=am

## 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**

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

## Ocean Color Data Distribution

- http://oceancolor.gsfc.nasa.gov/cgi/ocdist_stats.cgi

## SST Data Distribution

## Slide 32

## 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