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ATSR-2/AATSR Overlap Analysis

ATSR-2/AATSR Overlap Analysis. Gary Corlett AATSR Validation Scientist. Spectral Profiles. Simulated Bias: Centre of Swath. From Owen Embury (university of Edinburgh). Compare AATSR and ATSR-2 BTs: Case 1. Nadir View. Forward View. Compare AATSR and ATSR-2 BTs: Case 2. Nadir View.

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ATSR-2/AATSR Overlap Analysis

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  1. ATSR-2/AATSR Overlap Analysis Gary Corlett AATSR Validation Scientist

  2. Spectral Profiles

  3. Simulated Bias: Centre of Swath From Owen Embury (university of Edinburgh)

  4. Compare AATSR and ATSR-2 BTs: Case 1 Nadir View Forward View

  5. Compare AATSR and ATSR-2 BTs: Case 2 Nadir View Forward View

  6. Compare AATSR and ATSR-2 BTs: Case 2 Nadir View Forward View

  7. Effect of 12 micron BT offset UC: December 2005 Case C coefficients; UC*: December 2005 Case C coefficients + 0.2 K added to all 12 micron BTs Match-up data from Anne O’Carroll (Met Office)

  8. Correct AATSR or ATSR-2 ? A: +0.2 K offset applied to AATSR BTs B: -0.2 K offset applied to ATSR-2 BTs Match-up data from Anne O’Carroll (Met Office)

  9. 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 ~ + 0.05 K too warm • Retrieval is dependant on 3.7 µm channel • D2 SST estimates are ~ - 0.04 K too cold • Owing to opposite retrieval bias • Will be factored into updated SSES

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