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ACSPO Ver 1.3 test -- Compared to Ver 1.10 -- Data: Jan. 6 – Feb. 1

ACSPO Ver 1.3 test -- Compared to Ver 1.10 -- Data: Jan. 6 – Feb. 1. Xingming Liang. Daytime. Ch4 histogram in daytime. M-O biases are comparable in v1.30 and v1.10 largest difference is for NOAA18 (in v1.30 reduced by 0.05 K) RSD is a little smaller in V1.3 than V1.1, but

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ACSPO Ver 1.3 test -- Compared to Ver 1.10 -- Data: Jan. 6 – Feb. 1

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  1. ACSPO Ver 1.3 test-- Compared to Ver 1.10 -- Data: Jan. 6 – Feb. 1 Xingming Liang

  2. Daytime

  3. Ch4 histogram in daytime • M-O biases are comparable in v1.30 and v1.10 • largest difference is for NOAA18 (in v1.30 reduced by 0.05 K) • RSD is a little smaller in V1.3 than V1.1, but • NOBS significantly decreases (20%)

  4. Ch5 histogram in daytime The same patterns as in Ch4

  5. SST histogram in daytime • SST Biases are more consistent cross-platform in V1.30 than in V1.10 • All SST biases wrt Reynolds are positive during daytime as expected • The SST biases increase: • +0.3K for NOAA-16; +0.1 K for MetOp-A; • +0.12 K for NOAA-17; +0.02 K for NOAA-19. • The SST biases decrease by -0.05 K for NOAA-18. • Same as M-O biases’ analysis, RSD is a little smaller in V1.3 than V1.1 • NOBS significantly decreases (20%)

  6. Ch4 M-O bias distribution in daytime (V1.1)

  7. Ch4 M-O bias distribution in daytime (V1.3) • The number of hot spots is significantly smaller in V1.3 than V1.1 • On the other hand, a lot of good pixels in ambient clear-sky areas are also removed by new version. • These patterns are also observed in Ch5.

  8. SST bias distribution in daytime (V1.1)

  9. SST bias distribution in daytime (V1.3) • The number of cold spots is significantly reduced in V1.3 than V1.1 • On the other hand, a lot of good pixels in ambient clear-sky area are also removed by new version.

  10. Almost all parameters’ dependencies of SST biases are more consistent & flatter for all platforms in V1.3

  11. Dependencies of M-O Biases: Comparable in v1.3 and v1.1

  12. Nighttime

  13. Ch3B histogram in nighttime • NOBS in V1.3 is slightly reduced in nighttime compared to V1.1 • M-O biases and RSDs are comparable between V1.3 than V1.1

  14. Ch4 and Ch5 histograms in nighttime: Same patterns as in Ch3B

  15. SST histograms in daytime • All biases in v1.3 are consistently negative at night • The SST Biases are more consistent in V1.3 than V1.1. • NOAA-16: Welcome back to family • The SST biases increase: • +0.7K for NOAA-16; +0.07 K for MetOp-A; • +0.12 K for NOAA-17; +0.12 K for NOAA-18; +0.08 K for NOAA-19.

  16. M-O bias distribution in nighttime for Ch3B and Ch4 Comparable between V1.3 and V1.1

  17. M-O bias distribution in nighttime for Ch5 • Comparable between V1.3 and V1.1 • Why are there so large amount of hot spots in Ch5? (Non-linear water vapor absorption in Ch5?..)

  18. SST bias distribution in nighttime (V1.1)

  19. SST bias distribution in nighttime (V1.3) • The cold spots are largely reduced in V1.3. • The cold spots in SZA boundary are also largely removed (is it based on physical consideration?)

  20. Almost all parameters’ dependencies are more consistent & flatter for all platforms in V1.3

  21. Parameters’ dependencies for M-O bias are comparable or better in V1.3

  22. Parameters’ dependencies for M-O bias are comparable or better in V1.3

  23. Time series

  24. Nighttime

  25. V1.1 Comparable

  26. V1.3

  27. V1.1

  28. V1.3 NOAA-16 comes back to family

  29. V1.1 Comparable

  30. V1.3

  31. V1.1 Comparable

  32. V1.3

  33. V1.1

  34. V1.3 NOBS is slightly reduced in V1.3 compared to V1.1

  35. Daytime

  36. V1.1

  37. V1.3 SST biases is more consistent in V1.3

  38. V1.1

  39. V1.3 Daytime NOBS significantly reduced in V1.3

  40. Back-up

  41. V1.3

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