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Page 1 GHRSST-PP 8 th Science Team Meeting, Melbourne, 18 th May 2007 ATSR-2/AATSR Overlap Analysis Gary Corlett AATSR Validation Scientist.

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Presentation on theme: "Page 1 GHRSST-PP 8 th Science Team Meeting, Melbourne, 18 th May 2007 ATSR-2/AATSR Overlap Analysis Gary Corlett AATSR Validation Scientist."— Presentation transcript:

1 Page 1 GHRSST-PP 8 th Science Team Meeting, Melbourne, 18 th May 2007 ATSR-2/AATSR Overlap Analysis Gary Corlett AATSR Validation Scientist

2 Page 2 GHRSST-PP 8 th Science Team Meeting, Melbourne, 18 th May 2007 Spectral Profiles

3 Page 3 GHRSST-PP 8 th Science Team Meeting, Melbourne, 18 th May 2007 Simulated Bias: Centre of Swath From Owen Embury (university of Edinburgh)

4 Page 4 GHRSST-PP 8 th Science Team Meeting, Melbourne, 18 th May 2007 Compare AATSR and ATSR-2 BTs: Case 1 Nadir View Forward View

5 Page 5 GHRSST-PP 8 th Science Team Meeting, Melbourne, 18 th May 2007 Compare AATSR and ATSR-2 BTs: Case 2 Nadir View Forward View

6 Page 6 GHRSST-PP 8 th Science Team Meeting, Melbourne, 18 th May 2007 Compare AATSR and ATSR-2 BTs: Case 2 Nadir View Forward View

7 Page 7 GHRSST-PP 8 th Science Team Meeting, Melbourne, 18 th May 2007

8 Page 8 GHRSST-PP 8 th Science Team Meeting, Melbourne, 18 th May 2007

9 Page 9 GHRSST-PP 8 th Science Team Meeting, Melbourne, 18 th May 2007

10 Page 10 GHRSST-PP 8 th Science Team Meeting, Melbourne, 18 th May 2007

11 Page 11 GHRSST-PP 8 th Science Team Meeting, Melbourne, 18 th May 2007

12 Page 12 GHRSST-PP 8 th Science Team Meeting, Melbourne, 18 th May 2007

13 Page 13 GHRSST-PP 8 th Science Team Meeting, Melbourne, 18 th May 2007 Effect of 12 micron BT offset AATSR SkinAATSR Bulk Match-upsNBiasSt. Dev.% ±0.3NBiasSt. Dev.% ±0.3 Day D2 UC N/A Night D2 UC N/A Night D3 UC N/A Day D2 UC* N/A Night D2 UC* N/A Night D3 UC* N/A Match-up data from Anne O’Carroll (Met Office) UC: December 2005 Case C coefficients; UC*: December 2005 Case C coefficients K added to all 12 micron BTs

14 Page 14 GHRSST-PP 8 th Science Team Meeting, Melbourne, 18 th May 2007 Correct AATSR or ATSR-2 ? AATSR BulkATSR-2 Match-upsBias (K) Night D2 (A) Night D3 (A) Night D2 (B) Night D3 (B)+0.16 Match-up data from Anne O’Carroll (Met Office) A: +0.2 K offset applied to AATSR BTs B: -0.2 K offset applied to ATSR-2 BTs

15 Page 15 GHRSST-PP 8 th Science Team Meeting, Melbourne, 18 th May 2007 Summary & Conclusions  Calibration offset seen between AATSR and ATSR-2 12 μm clear-sky sea BTs ATS_MET_2P and AT2_MET_2P products analysed Validation results suggest AATSR is incorrect RAL to analyse flight-spare FPA Long-wavelength out-of-band leakage is suspected Modelled by Dave Smith (RAL); to be tested by Edinburgh  The bottom line for GHRSST-PP users D3 SST estimates are ~ K too warm Retrieval is dependant on 3.7 µm channel D2 SST estimates are ~ K too cold Owing to opposite retrieval bias Will be factored into updated SSES


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