8th ioccg meeting in florence, italy (24-26 feb 03) current status of modis (terra and aqua) by...
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8th IOCCG Meeting in Florence, Italy
(24-26 Feb 03)
Current Status of MODIS (Terra and Aqua)
byChuck Trees for the
MODIS Team Members
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
• Launch Terra 12/1999• Launch Aqua 5/2002
• Re-compete team in mid 2003
TERRA MODIS NIGHTTIME 4m SST
MODIS/OCEAN GROUPGSFC, RSMAS
-2 5 10 15 20 25 30 35Co
MAY 2001 V 3.3.1
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 StdDevNumber
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
• 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
AQUA, TERRA combined orbits nearly eliminate swath gaps
Composite AQUA, TERRA SST Night Sept 29, 2002
Nearly Complete Single Day Global CoverageComposite Night (MODIS-T, MODIS-A)
Day, Night - (AMSR, TMI) Prototype Sept 29, 2002, 0.25O spatial resolution
Kyle
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
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.
•Next reprocessing (TERRA Collection 5)
•Combined Terra and Aqua products
1. New cross-scan normalization based on individual detectors. This improves detector gain stability across the scan, thereby improving stripe removal.
2. Sun glint correction using vector winds to improve the east-west adjacent swath edge consistency.
3. Ocean BRDF correction
•Next reprocessing Terra Collection 4 in May 2003 1. Calibration issues and discontinuities will be corrected
for time period of Sept. 2001 - Dec 2002
Future Data Releases
TERRA Collection 4
AQUA Collection 3
Merged Terra, Aqua, SeaWiFS Chlor_a_2January 19, 2003full time series available in SeaWiFS 9km formathttp://jeager.gsfc.nasa.gov/browsetool/
2000 2001 2002
Valid period 305-800
Comparison of MODIS Chlorophyll Products
June 2001 Chlor_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.
Comparison between Chlor_a_3 SemiAnalytic and OC4v4 algorithms for Chlorophyll a for the Antarctic and
Southern California Bight upwelling zone
Note the large negative bias for the SeaWiFS algorithm and the improved performance for the semi-analytic Chlor_a_3 algorithm compared to in situobservations
Southern CaliforniaBight
AntarcticSemi-analytic
AntarcticSeaWiFS
Independent Validation StudyGregg and Casey, in progress
NODC + SeaBASS, L-3 4.6kmQuality Level 0, 1
Chlor_a_2 virtually identical performance as for SeaWiFSr2 = 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_3
Chlor_a_2
Watson Gregg & Nancy McCabe
OCEAN PRODUCTIVITY from MODIS : A New Baseline
Validated data period
Esaias et al. Poster:Compares Ocean Production using MODIS, SeaWiFS, different chlorophyll algorithms two production modelsMODIS 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.
Above: Mixed layer Ocean Production Index P2Standard MODIS Product Collection 4
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.
Global average
South Atlantic 10S° to 50°S
Antarctic, S of 50°S
Weekly FLH
Weekly Productivity (P1)
(From Frank Hoge and Paul Lyon)
FLH vs. chlorophyll
FLH vs. CDOM
Where to get data and more informationInformation locations:MODIS Oceans home page
– http://modis-ocean.gsfc.nasa.govMODIS 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->oceanEOS DATA GATEWAY EDG
- http://modis.gsfc.nasa.gov/data/ordering.html