SST from MODIS AQUA and TERRA

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SST from MODIS AQUA and TERRA

• Kay Kilpatrick, Ed Kearns, Bob Evans, and Peter
  Minnett
• Rosenstiel School of Marine and Atmospheric
  Science
• University of Miami
• MODIS Science Team Meeting
• Baltimore, MD. July 2004

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Sea Surface temperature Cal/ValMODIS AQUA and
TERRAMODAPS/DAAC archived Products
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TERRA global cal/val stats
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AQUA global cal/cal stats
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Aggregate stats

• Aggregate globally distributed matchups for each
  sensor ,quantify and validate the existing code
  and production of Seasurface temperature at
  MODAPS
• The instruments continue to perform very well
  relative to in-situ measurements. Time series
  show no obvious trends and residuals are stable
  in time and latitude. (see poster)
• Statistics are comparable to those of the AVHRR
  Pathfinder SST. Comparisons of collocated
  retrievals with AMSR and ATSR, TMI are also very
  good.
• Analysis with respect to mirror side and sat
  zenith angle suggest further improvements are
  possible to improve accuracy and reduce
  uncertainty.

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TERRA 11-12um SST cal/valMirror side and Sat
zenith angle
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TERRA SST 4.5 coefficients

• Terra residuals show a classic V shape as a
  function of Zenith angle. Suggesting a small
  error in the in the atmospheric/4th term of the
  algorithm. Apex of the V is a nadir at the
  expected -0.05- -0.1 oC skin-bulk offset.
• Sensor measures skin temperature and is expected
  to generally be colder than the buoys.
• Two mirror sides appear to behave in a similar
  manner.

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AQUA MODIS Buoy M-AERI matchups
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AQUA MODIS Buoy M-AERI matchups highest
quality
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AQUA 11-12um SST cal/valmirror side and Sat
zenith angle
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AQUA SST 4.5 coefficients

• AQUAs two mirror sides do not behave the same.
• Classic V pattern of residuals with satellite
  zenith angle is not present.
• Results suggest that small RVS remains as there
  is a suggestion of a slope across the scan. (AQUA
  MCST RVS based on pre-launch data, TERRA based on
  closed Door on orbit data)
• Nadir values are near Zero rather than the
  expected -0.05- -0.1.

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AQUA coefficients 4.5

• Examination of AQUA low water vapor regime d31-32
  lt0.7 suggest a more flat line with a hint of a
  V with respect to sat zenith angle with on
  offset at -0.1. At Nadir for both mirror sides.
• The fact that trends are only present in high
  water vapor regimes suggest that the RVS problem
  maybe restricted to band 32 only, as it is only
  in these conditions that band 32 comes into play
  thru the band 31-32 difference term.
• In low WV band 31 dominated.
• More matchups in high latitude cold dry
  atmospheres are needed to confirm results.

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Plans for SST collection 5

• Revised coeffficeints sst and sst4
• Revised l1b emmissive LUT for oceans thermal and
  mid and ir bands?
• Better RVS corrections
• L1b schedule 9/10/04 TERRA, AQUA 12/3/04
• Schedule TERRA 2/1/05, AQUA 5/1/05
• Decision trees better cloud flagging
• use of sst4 as first guess at night) more for the
  ocean talk.