Comparison of AATSR SST with other sensors - PowerPoint PPT Presentation

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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