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Current Status of MODIS (Terra and Aqua) by Chuck Trees for the MODIS Team Members . 8th IOCCG Meeting in Florence, Italy (24-26 Feb 03). Brief MODIS History. Definition Panel 1984 Selection of Instrument, Instrument Team - 1989 Restructuring - 1992

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slide1

Current Status of MODIS

(Terra and Aqua)

by

Chuck Trees for the

MODIS Team Members

8th IOCCG Meeting in Florence, Italy

(24-26 Feb 03)

brief modis history
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
  • LaunchTerra 12/1999
  • Launch Aqua 5/2002
  • Re-compete team in mid 2003
slide3

TERRA MODIS NIGHTTIME 4mm SST

MAY 2001

V 3.3.1

-2 5 10 15 20 25 30 35

Co

MODIS/OCEAN GROUP

GSFC, RSMAS

slide4

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 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
  • SST - new coefficients

Median StdDev Number

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
aqua terra combined orbits nearly eliminate swath gaps composite aqua terra sst night sept 29 2002
AQUA, TERRA combined orbits nearly eliminate swath gapsComposite AQUA, TERRA SST Night Sept 29, 2002
slide6

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 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
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.
slide9

Future Data Releases

  • Next reprocessing Terra Collection 4 in May 2003

1. Calibration issues and discontinuities will be corrected for time period of Sept. 2001 - Dec 2002

  • Next reprocessing (TERRA Collection 5)
  • New cross-scan normalization based on individual detectors. This improves detector gain stability across the scan, thereby improving stripe removal.
  • Sun glint correction using vector winds to improve the east-west adjacent swath edge consistency.
  • Ocean BRDF correction
  • Combined Terra and Aqua products
slide12

Merged Terra, Aqua, SeaWiFS Chlor_a_2

January 19, 2003

full time series available in SeaWiFS 9km format

http://jeager.gsfc.nasa.gov/browsetool/

slide13

2000 2001 2002

Valid period 305-800

slide14

Comparison of MODIS Chlorophyll ProductsJune 2001Chlor_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.

slide16

Independent Validation Study

Gregg and Casey, in progress

NODC + SeaBASS, L-3 4.6km

Quality Level 0, 1

Chlor_a_2 virtually identical performance as for SeaWiFS

r2 = 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_2

Chlor_a_3

Watson Gregg & Nancy McCabe

slide19

OCEAN PRODUCTIVITY from MODIS : A New Baseline

Global average

Validated data period

Above: Mixed layer Ocean Production Index P2

Standard MODIS Product Collection 4

South Atlantic 10S° to 50°S

Esaias et al. Poster:

Compares Ocean Production using

MODIS, SeaWiFS,

different chlorophyll algorithms

two production models

MODIS 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.

Antarctic, S of 50°S

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.

slide23

FLH vs.

chlorophyll

FLH vs.

CDOM

where to get data and more information
Where to get data and more information

Information locations:

MODIS Oceans home page

  • http://modis-ocean.gsfc.nasa.gov

MODIS 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->ocean

EOS DATA GATEWAY EDG

- http://modis.gsfc.nasa.gov/data/ordering.html