Atmospheric Oceanic Planetary Physics University of Oxford Joint

Atmospheric, Oceanic & Planetary Physics, University of Oxford Joint p. T + H 2 O + O 3 Microwindows (part of WP 2100) A Dudhia MIPAS_SM PM 3 Paris 2 nd March 2004 Page 1

Joint p. T+H 2 O+O 3 Microwindows Atmospheric, Oceanic & Planetary Physics, University of Oxford 3 sets of 10 microwindows are being provided, each with different maximum widths: 1 cm-1 2 cm-1 and 3 cm-1 Previous Meeting: q 1 cm-1 MWs completed with LUTs & IGs q 2 cm-1 MWs completed, no LUTs or IGs yet q 3 cm-1 MWs still being selected (1 st 5 found so far) Current Status: q. All MWs selected, LUTs and IGs generated A Dudhia MIPAS_SM PM 3 Paris 2 nd March 2004 Page 2

Nominal Microwindows A Dudhia Atmospheric, Oceanic & Planetary Physics, University of Oxford MIPAS_SM PM 3 Paris 2 nd March 2004 Page 3

1 cm-1 Microwindows A Dudhia Atmospheric, Oceanic & Planetary Physics, University of Oxford MIPAS_SM PM 3 Paris 2 nd March 2004 Page 4

2 cm-1 Microwindows A Dudhia Atmospheric, Oceanic & Planetary Physics, University of Oxford MIPAS_SM PM 3 Paris 2 nd March 2004 Page 5

3 cm-1 Microwindows A Dudhia Atmospheric, Oceanic & Planetary Physics, University of Oxford MIPAS_SM PM 3 Paris 2 nd March 2004 Page 6

Current Retrieval Errors A Dudhia Atmospheric, Oceanic & Planetary Physics, University of Oxford MIPAS_SM PM 3 Paris 2 nd March 2004 Page 7

1 cm-1 Retrieval Errors A Dudhia Atmospheric, Oceanic & Planetary Physics, University of Oxford MIPAS_SM PM 3 Paris 2 nd March 2004 Page 8

2 cm-1 Retrieval Errors A Dudhia Atmospheric, Oceanic & Planetary Physics, University of Oxford MIPAS_SM PM 3 Paris 2 nd March 2004 Page 9

3 cm-1 Retrieval Errors A Dudhia Atmospheric, Oceanic & Planetary Physics, University of Oxford MIPAS_SM PM 3 Paris 2 nd March 2004 Page 10

Retrieved Information Set N. MW N. Pts %Use Info Old 14 8177 54 158 1 cm-1 10 4223 76 190 2 cm-1 10 7783 65 207 3 cm-1 10 13790 60 218 A Dudhia Atmospheric, Oceanic & Planetary Physics, University of Oxford MIPAS_SM PM 3 Paris 2 nd March 2004 Page 11

Information Growth A Dudhia Atmospheric, Oceanic & Planetary Physics, University of Oxford MIPAS_SM PM 3 Paris 2 nd March 2004 Page 12

Information Growth A Dudhia Atmospheric, Oceanic & Planetary Physics, University of Oxford MIPAS_SM PM 3 Paris 2 nd March 2004 Page 13

Information Growth A Dudhia Atmospheric, Oceanic & Planetary Physics, University of Oxford MIPAS_SM PM 3 Paris 2 nd March 2004 Page 14

Information Growth A Dudhia Atmospheric, Oceanic & Planetary Physics, University of Oxford MIPAS_SM PM 3 Paris 2 nd March 2004 Page 15

Information Growth A Dudhia Atmospheric, Oceanic & Planetary Physics, University of Oxford MIPAS_SM PM 3 Paris 2 nd March 2004 Page 16

Information Growth A Dudhia Atmospheric, Oceanic & Planetary Physics, University of Oxford MIPAS_SM PM 3 Paris 2 nd March 2004 Page 17

Information Growth A Dudhia Atmospheric, Oceanic & Planetary Physics, University of Oxford MIPAS_SM PM 3 Paris 2 nd March 2004 Page 18

Information Growth A Dudhia Atmospheric, Oceanic & Planetary Physics, University of Oxford MIPAS_SM PM 3 Paris 2 nd March 2004 Page 19

Information Growth A Dudhia Atmospheric, Oceanic & Planetary Physics, University of Oxford MIPAS_SM PM 3 Paris 2 nd March 2004 Page 20

Information Growth A Dudhia Atmospheric, Oceanic & Planetary Physics, University of Oxford MIPAS_SM PM 3 Paris 2 nd March 2004 Page 21

Joint p. T+H 2 O+O 3 Microwindows Atmospheric, Oceanic & Planetary Physics, University of Oxford Conclusion Ø Joint microwindows for p. T + H 2 O + O 3 significantly more ‘efficient’ in terms of accuracy per measurement or per microwindow than independent retrieval microwindows. Ø 2 cm-1 and 3 cm-1 max width microwindows very similar, but 1 cm-1 microwindows rather different. Ø Note, however, that these joint microwindows have been selected ignoring horizontal gradient errors (ie for GEOFITtype retrieval). A Dudhia MIPAS_SM PM 3 Paris 2 nd March 2004 Page 22

Atmospheric, Oceanic & Planetary Physics, University of Oxford Special Modes (part of WP 1400/2100) A Dudhia MIPAS_SM PM 3 Paris 2 nd March 2004 Page 23

Special Modes Atmospheric, Oceanic & Planetary Physics, University of Oxford Previously … q Selected Occupation Matrices for Key Species for Special Modes using existing MW datasets q 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) q. Selected Occupation Matrices for Additional Species for Special Modes using nominal mode 0. 025 cm-1 MW datasets A Dudhia MIPAS_SM PM 3 Paris 2 nd March 2004 Page 24

Special Modes Additional Species Atmospheric, Oceanic & Planetary Physics, University of Oxford PM 2 Conclusions ØSpecial 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 ØSpecial Modes at lower spectral resolution (S 4, S 6) may result in improved retrievals of minor species through improved S/N (particularly cross-section molecules) – not yet tested This Meeting: Ø test the second conclusion (for S 6 mode) A Dudhia MIPAS_SM PM 3 Paris 2 nd March 2004 Page 25

Special Modes Mode Description Atmospheric, Oceanic & Planetary Physics, University of Oxford Altitude Range [km] Vertical Resl. [km] Spectral Resl. [cm-1] S 1 Polar Chem. & Dynamics 7 -55 2 0. 025 S 2 Trop/Strat Exchange 5 -40 1. 5 0. 025 S 3 Aircraft Emissions 6 -40 1. 5 0. 025 S 4 Stratospheric Dynamics 8 -53 3 0. 1 S 5 Diurnal Changes 15 -60 3 0. 025 S 6 Upper Trop/Lower Strat 6 -35 2 0. 1 A Dudhia MIPAS_SM PM 3 Paris 2 nd March 2004 Page 26

S 6 Special Mode Atmospheric, Oceanic & Planetary Physics, University of Oxford Key Features 0. 1 cm-1 resolution instead of 0. 025 cm-1 Ø Expect factor 2 improvement in S/N 2 km vertical spacing instead of 3 km Ø 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. A Dudhia MIPAS_SM PM 3 Paris 2 nd March 2004 Page 27

S 6 Special Mode Atmospheric, Oceanic & Planetary Physics, University of Oxford Microwindow Selection Select dedicated microwindows for 6 key species and 7 major additional species: Cl. ONO 2, COF 2, CFC-11, CFC-12, HCFC-22, OCS and SF 6 (OCS replaces NH 3 from earlier part of study – see presentation from Alastair Burgess) Plots show comparison with nominal mode, and 0. 1 cm-1 microwindows selected for nominal mode spacing (‘LR’ – key species only) A Dudhia MIPAS_SM PM 3 Paris 2 nd March 2004 Page 28

S 6 Microwindows Key Species A Dudhia Atmospheric, Oceanic & Planetary Physics, University of Oxford MIPAS_SM PM 3 Paris 2 nd March 2004 Page 29

Nominal Microwindows A Dudhia Atmospheric, Oceanic & Planetary Physics, University of Oxford MIPAS_SM PM 3 Paris 2 nd March 2004 Page 30

S 6 Microwindows Minor Species A Dudhia Atmospheric, Oceanic & Planetary Physics, University of Oxford MIPAS_SM PM 3 Paris 2 nd March 2004 Page 31

TEM A Dudhia Atmospheric, Oceanic & Planetary Physics, University of Oxford MIPAS_SM PM 3 Paris 2 nd March 2004 Page 32

PRE A Dudhia Atmospheric, Oceanic & Planetary Physics, University of Oxford MIPAS_SM PM 3 Paris 2 nd March 2004 Page 33

CH 4 A Dudhia Atmospheric, Oceanic & Planetary Physics, University of Oxford MIPAS_SM PM 3 Paris 2 nd March 2004 Page 34

H 2 O A Dudhia Atmospheric, Oceanic & Planetary Physics, University of Oxford MIPAS_SM PM 3 Paris 2 nd March 2004 Page 35

HNO 3 A Dudhia Atmospheric, Oceanic & Planetary Physics, University of Oxford MIPAS_SM PM 3 Paris 2 nd March 2004 Page 36

N 2 O A Dudhia Atmospheric, Oceanic & Planetary Physics, University of Oxford MIPAS_SM PM 3 Paris 2 nd March 2004 Page 37

NO 2 A Dudhia Atmospheric, Oceanic & Planetary Physics, University of Oxford MIPAS_SM PM 3 Paris 2 nd March 2004 Page 38

O 3 A Dudhia Atmospheric, Oceanic & Planetary Physics, University of Oxford MIPAS_SM PM 3 Paris 2 nd March 2004 Page 39

Cl. ONO 2 A Dudhia Atmospheric, Oceanic & Planetary Physics, University of Oxford MIPAS_SM PM 3 Paris 2 nd March 2004 Page 40

COF 2 A Dudhia Atmospheric, Oceanic & Planetary Physics, University of Oxford MIPAS_SM PM 3 Paris 2 nd March 2004 Page 41

CFC-11 A Dudhia Atmospheric, Oceanic & Planetary Physics, University of Oxford MIPAS_SM PM 3 Paris 2 nd March 2004 Page 42

CFC-12 A Dudhia Atmospheric, Oceanic & Planetary Physics, University of Oxford MIPAS_SM PM 3 Paris 2 nd March 2004 Page 43

HCFC-22 A Dudhia Atmospheric, Oceanic & Planetary Physics, University of Oxford MIPAS_SM PM 3 Paris 2 nd March 2004 Page 44

OCS A Dudhia Atmospheric, Oceanic & Planetary Physics, University of Oxford MIPAS_SM PM 3 Paris 2 nd March 2004 Page 45

SF 6 A Dudhia Atmospheric, Oceanic & Planetary Physics, University of Oxford MIPAS_SM PM 3 Paris 2 nd March 2004 Page 46