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Joint pT + H2O + O3 Microwindows (part of WP2100)

This document provides information on the joint microwindows for measuring pT, H2O, and O3 gases. It includes the selection process, retrieval errors, and retrieved information. The document also discusses special modes and their impact on accuracy.

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Joint pT + H2O + O3 Microwindows (part of WP2100)

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  1. Joint pT + H2O + O3 Microwindows (part of WP2100) Page 1

  2. Joint pT+H2O+O3 Microwindows 3 sets of 10 microwindows are being provided, each with different maximum widths: 1cm-1 2cm-1 and 3cm-1 Previous Meeting: • 1cm-1 MWs completed with LUTs & IGs • 2cm-1 MWscompleted, no LUTs or IGs yet • 3cm-1 MWsstill being selected (1st 5 found so far) Current Status: • All MWs selected, LUTs and IGs generated Page 2

  3. Nominal Microwindows Page 3

  4. 1cm-1 Microwindows Page 4

  5. 2cm-1 Microwindows Page 5

  6. 3cm-1 Microwindows Page 6

  7. Current Retrieval Errors Page 7

  8. 1cm-1 Retrieval Errors Page 8

  9. 2cm-1 Retrieval Errors Page 9

  10. 3cm-1 Retrieval Errors Page 10

  11. Retrieved Information Page 11

  12. Information Growth Page 12

  13. Information Growth Page 13

  14. Information Growth Page 14

  15. Information Growth Page 15

  16. Information Growth Page 16

  17. Information Growth Page 17

  18. Information Growth Page 18

  19. Information Growth Page 19

  20. Information Growth Page 20

  21. Information Growth Page 21

  22. Joint pT+H2O+O3 Microwindows Conclusion • Joint microwindows for pT + H2O + O3 significantly more ‘efficient’ in terms of accuracy per measurement or per microwindow than independent retrieval microwindows. • 2cm-1 and 3cm-1 max width microwindows very similar, but 1cm-1 microwindows rather different. • Note, however, that these joint microwindows have been selected ignoring horizontal gradient errors (ie for GEOFIT-type retrieval). Page 22

  23. Special Modes (part of WP1400/2100) Page 23

  24. Special Modes • Previously … • Selected Occupation Matrices for Key Species for Special Modes using existing MW datasets • Selected Occupation Matrices for Additional Species for Nominal Mode using dedicated MW datasets Results in Survey of Existing Algorithms for the Selection of Auxiliary Data (Aug 2003) Last Meeting (Nov 2004) • Selected Occupation Matrices for Additional Species for Special Modes using nominal mode 0.025cm-1 MW datasets Page 24

  25. Special Modes Additional Species • PM2 Conclusions • Special Modes at normal spectral resolution are generally at higher vertical sampling than nominal mode resulting in worse retrievals of minor species unless retrieval grid is reduced • Special Modes at lower spectral resolution (S4,S6) may result in improved retrievals of minor species through improved S/N (particularly cross-section molecules) – not yet tested This Meeting: • test the second conclusion (for S6 mode) Page 25

  26. Special Modes Page 26

  27. S6 Special Mode Key Features 0.1cm-1 resolution instead of 0.025cm-1 • Expect factor 2 improvement in S/N 2km vertical spacing instead of 3km • Expect factor √(2/3) reduction in S/N (neglecting FOV) Overall, not clear whether these will be better or worse accuracy than nominal mode retrievals. Page 27

  28. S6 Special Mode Microwindow Selection Select dedicated microwindows for 6 key species and 7 major additional species: ClONO2, COF2, CFC-11, CFC-12, HCFC-22, OCS and SF6 (OCS replaces NH3 from earlier part of study – see presentation from Alastair Burgess) Plots show comparison with nominal mode, and 0.1cm-1 microwindows selected for nominal mode spacing (‘LR’ – key species only) Page 28

  29. S6 Microwindows Key Species Page 29

  30. Nominal Microwindows Page 30

  31. S6 Microwindows Minor Species Page 31

  32. TEM Page 32

  33. PRE Page 33

  34. CH4 Page 34

  35. H2O Page 35

  36. HNO3 Page 36

  37. N2O Page 37

  38. NO2 Page 38

  39. O3 Page 39

  40. ClONO2 Page 40

  41. COF2 Page 41

  42. CFC-11 Page 42

  43. CFC-12 Page 43

  44. HCFC-22 Page 44

  45. OCS Page 45

  46. SF6 Page 46

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