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Comparison of AATSR SST with other sensors

Comparison of AATSR SST with other sensors. David Ridley Marianne Edwards Space Research Centre University of Leicester. Comparison with global datasets. Comparison of global monthly mean AATSR SST data with:- ATSR-2 AVHRR MODIS ECMWF TMI

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Comparison of AATSR SST with other sensors

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  1. Comparison of AATSR SST with other sensors David Ridley Marianne Edwards Space Research Centre University of Leicester

  2. Comparison with global datasets • Comparison of global monthly mean AATSR SST data with:- • ATSR-2 • AVHRR • MODIS • ECMWF • TMI • To date, comparisons performed between AATSR data and MODIS, ECMWF and TMI for September 2002 • Data compared are monthly means, at half degree resolution • AATSR data used: spatially averaged product, dual view SST retrieval, all available data

  3. Methodology • Difference images produced to find areas of discrepancy for more detailed analysis. • Time series analysis.

  4. AATSR vs ECMWF Sept 2002 ECMWF: 2.5 degree • Mean global difference: -0.05 deg K • Mean absolute difference: 0.88 deg K • Standard deviation: 1.43 deg K • Tropical region (+/- 30 degrees) • Mean difference: -0.40 deg K • Standard deviation: 0.88 deg K • Percentage of values between +/- 0.6 deg K: 54.82

  5. AATSR vs TMI Sept 2002 TMI data: 0.25 degree Binned to half degree for comparison • Mean global difference: -0.38 deg K (TMI warmer) • Mean absolute difference: 0.50 deg K • Standard deviation: 0.55 deg K • Tropical region (+/- 30 degrees) • Mean difference: -0.42 deg K • Standard deviation: 0.50 deg K • Percentage of values between +/- 0.6 deg K: 68.48

  6. AATSR vs MODIS Sept 2002 • Mean global difference: -0.41deg K (MODIS warmer) • Standard deviation: 0.75 deg K • Tropical region (+/- 30 degrees) • Mean difference: -0.41 deg K • Standard deviation: 0.51 deg K • Percentage of values between +/- 0.6 deg K: 65.63 MODIS: 36km, SST from 11 micron day/night

  7. Conclusions • Preliminary results - comparisons performed for AATSR data and SST from ECMWF analyses, MODIS and TMI data, for September 2002 • Difficult to see patterns with one month’s data. More data and processing needed, including comparisons with AVHRR and ATSR-2. • Further investigations needed. • How accurate are TMI and MODIS against buoy data? • Spot checks using precision radiometers

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