Impact of Spectroscopic Parameter Archive on Second Generation Vertical Sounders Radiance Simulation: the GEISA/IASI Database as an example

Transcription

1 Impact of Spectroscopic Parameter Archive on Second Generation Vertical Sounders Radiance Simulation: the GEISA/IASI Database as an example N. Jacquinet-Husson, N.A. Scott, A. Chédin, R. Armante et co-authors des laboratoires participants à la mise à jour de GEISA/IASI Laboratoire de Météorologie Dynamique Atmospheric Radiation Analysis Group Ecole Polytechnique 91128, Palaiseau, France

2 PRESENTATION CONTENT I. GEISA and GEISA/IASI-03 overview II. III. IV. GEISA/IASI-03 line transition parameters update impact illustration: H 2 O as an example Assessment of the GEISA/IASI spectroscopic data quality through comparisons with other public database archives GEISA-03 distribution and access

3 I GEISA-03 and GEISA/IASI-03 OVERVIEW

4 The GEISA spectroscopic database in the ARA/LMD tools

5 GEISA-03 OVERVIEW N. JACQUINET-HUSSON, et al. The 1997 spectroscopic GEISA databank JQSRT, 62, pp , 1999 N. JACQUINET-HUSSON, N.A. SCOTT, A. CHEDIN, AND A.A. CHURSIN The GEISA spectroscopic database system revisited for IASI direct radiative transfer modelling Atmospheric and Oceanic Optics. Vol.16, No.3, pp , 2003 N. JACQUINET-HUSSON, N. A. SCOTT, K. GARCERAN, R. ARMANTE, A. CHÉDIN The 2003 Edition of GEISA: A spectroscopic database system for the second generation vertical sounders radiance simulation Proceedings of the XIIIth International TOVS Study Conference (ITSC XIII) - Sainte-Adèle, Canada, 24 Octobre 24 Novembre 2003.

6 The GEISA-2003 system

7 GEISA-03 line transition parameters sub-database Content summary Molecule # Transitions Molecule # Transitions H2O CO O N2O CO CH O NO SO NO NH PH HNO OH HF 107 HCl 533 HBr 1294 HI 806 ClO 7230 OCS H2CO 2701 C2H CH3D C2H C2H GeH4 824 HCN 2550 C3H Spectral range: 0 35,877 cm -1 Total # transitions : 1,668,371

8 GEISA-03 IR cross-sections sub-database overview 23 molecular species already archived in GEISA CFC-11, CFC-12, CFC-13, CFC-14, HCFC-22, HFC-32, CFC-113, CFC-114, CFC-115, HCFC-123, HCFC-124, HFC-125, HFC-134, HFC-134a, HCFC-141b, HCFC-142b, HFC-143a, HFC-152a, HCFC-225ca, HCFC-225cb, N2O5, SF6, ClONO2 12 molecular species newly archived in GEISA-03 C2F6 Perfluoroethane C3H8 Propane C2H6 ethane C2H2 acetylene C2H4 ethene SF5CF3 trifluoromethyl sulfur pentafluoride CHF2CH2F (HFC-143) CCl4 C4F8 HNO4 HCH-365mfc HCFC-21

9 ! "! # $ %! Spectral range nm 11 molecular species 164 T,P sets 12,958,953 entries BU: Bremen University Molecular Spectroscopy and Chemical Kinetics Group J. Orphal BIRA/IASB: Belgium Institute for Space Aeronomy A.C. Vandaele RAL/MSF: Rutherford Appleton Laboratory Molecular Spectroscopy Facility Spectroscopy Group K.M. Smith

10 GEISA-03 aerosols sub-database A Database on atmospheric aerosols from LITMS Rublev (1994) The software package and database OPAC (Optical Properties of Aerosols and Clouds) (Hess et al., 1998) The Global Aerosol Data Set: GADS Koepke et al. (1997)

11 GEISA/IASI-03 database overview

12 GEISA/IASI database general context Extraction of GEISA-03 between 599 & 3001 cm -1 Total # entries: 702,550 Individual spectral lines spectroscopic parameters sub-database 14 molecules (53 isotopic species): H 2 O, CO 2, O 3, N 2 O, CO, CH 4, O 2, NO, SO 2, NO 2, HNO 3, OCS, C 2 H 2, N 2 IR absorption cross-sections sub-database (mainly CFC s) 6 molecular species: CFC-11, CFC-12, CFC-14, CCl 4, N 2 O 5, HCFC-22 Microphysical and optical properties of Basic Atmospheric aerosol components sub-database (similar with the GEISA-03 one) Continuous update Related with: CNES/EUMETSAT EPS mission IASI measurement capabilities assessment ISSWG (IASI Sounding Science Working Group) Associated interest for AIRS

13 GEISA/IASI-03 line transition parameters subdatabase content summary Molecule Code Isotopes # Transitions h2o co o n2o co ch (ch3d) o no so no hno ocs c2h n Spectral range: cm -1 Total : 702, molecules 53 isotopic species

14 Fields of the format for line transition parameters in GEISA-03 Fortran format descriptor

15 II GEISA/IASI-03 line transition parameters update impact illustration: H2O as an example

16 H 2 O GEISA/IASI-03 update and alternative archive Toth s (2000, 2002) cm -1 (2003 update) RAL/ EUMETSAT cm -1 (Alternative archive) Log intensity ( cm.molecule -1 ) New data for GIA-03 Log intensity ( cm.molecule -1 ) New data for GIA Wavenumber ( cm -1 ) Wavenumber (cm -1 ) (GIA: GEISA/IASI)

17 H2O update in GEISA/IASI-03: TOTH VS RAL 250 H2O RAL / geisa+toth air broadened halfwidth differences : HWdif = [ HW(RAL) - HW(GS+TOT) ] in percent 100 H2O RAL / geisa+toth Intensity differences : Idif = [ I(RAL) - I(GS+TOT) ] in percent HWdif (%) Idif (%) Frequency (cm-1) Frequency (cm-1)

18 IASI Stransac-2000 simulations with RAL or TOTH s H2O spectroscopy CAMEX (HIS) 29/09/94

19 III ASSESSMENT OF THE GEISA/IASI SPECTROSCOPIC DATA QUALITY Trough comparisons with other public database archives

20 Data bases involved in comparisons GEISA/IASI-03 Jacquinet-Husson et al. J. Quant. Spectrosc. Radiat. Transfer 95 (2005) MIPAS Dedicated Spectroscopic Database Flaud et al. J. Atm. And Ocean Optics, 16 (2003) HITRAN-04 Rothman et al. J. Quant. Spectrosc. Radiat. Transfer 96 (2005) Molecular species selected for comparisons, i.e.: H2O, CO2, O3, N2O, CO, CH4

21 MIPAS Dedicated Spectroscopic Database

22 Spectroscopic data involved in comparisons 3 spectral bands: B m ( cm -1 ) B m ( cm -1 ) B m ( cm -1 )

23 GEISA/IASI-03 AND MIPAS spectroscopic databases content difference evaluations

24 EXAMPLE of EVALUATION OF THE DIFFERENCES FOR INTENSITIES: molecule O 3

25 EXAMPLE of EVALUATION OF THE DIFFERENCES FOR COLLISION HALF -WIDTHS: moleculeco 2

26 Evaluation of the Impact of Spectroscopic Archive Differences on IASI Direct Radiative Transfer Simulations! "#

27 IASI 4A-2000 Band-1 Simulation TIGR-2000 Tropical

28 IASI 4A-2000 Band-1 Simulation TIGR-2000 Mean latitude 2

29 IASI 4A-2000 Simulation TIGR-2000 Polar 1 Band-1

30 IASI 4A-2000 Band-2 Simulation TIGR-2000 Mean latitude 1

31 IASI 4A-2000 Band-2 Simulation TIGR-2000 Polar 2

32 IASI 4A-2000 Band-3 Simulation TIGR-2000 Tropical

33 IASI 4A-2000 Band-3 Simulation TIGR-2000 Mean latitude 2

34 Remaining spectroscopy related problems (non exhaustive list) Some conclusions of validation exercises, using e.g. : the 4A-00/LMD Model, in the case of IASI radiative transfer modeling 1. The water vapour spectroscopic parameters: still need to be validated; 2. The water vapour continuum: more tuning to be done when more validation data (especially with high water vapor content) become available; 3. The freons bands at 850 and 920 cm -1 : refine the temperature dependence; 4. O 3 in the 9.6 micron region: the spectroscopic parameters still need to be validated; 5. Some CO2 Q branches: further improvement/tuning of the line mixing

35 15 m CO 2 Band

36 IASI sounding modelling and 15 m channels selection c

37 IV GEISA-03 distribution and access ftp : new GEISA-03 data for lines, cross sections and aerosols : different formats available including the HITRAN-00 and HITRAN- 04 formats for the line sub-databases associated management tools Web: complete new technical documentation on the web site

38 GEISA and GEISA/IASI Operational Use (3) First access GEISA and GEISA and registerme

39 ACKNOWLEDGMENTS to CNES and EUMETSAT for their Encouragements and Supports