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EVALUATION OF GEISA CONTENTS

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Presentation on theme: "EVALUATION OF GEISA CONTENTS"— Presentation transcript:

1 EVALUATION OF GEISA CONTENTS
TITAN EARTH (CASSINI-HUYGENS 29/01/06) (MSG-2 25/01/06) EARTH and MetOp/IASI ( Infrared Atmospheric sounder Interferometer ) 42 co-Authors -16 Laboratorise IASI on metop since October 19th Launch IASI level 1 cal/val activities GEISA/IASI used as the reference spectroscopic database Radiative Transfer Model (4A) will be used for validation Scott & Chédin, J.Appl.Met (1981); 4A-OP, NOVELTIS GEISA/IASI EFFECTIVE USE The GEISA/IASI database is an extraction (spectral range cm-1) of the GEISA Spectroscopic database. It has been developed and is maintained with the purpose of assessing the IASI measurements capabilities, in the frame of the EUMETSAT European Polar System (EPS) preparation, by simulating high resolution radiances and/or using experimental data. Assessment of GEISA contents through comparison with other public spectroscopic databases (IASI brightness temperature difference simulations) Impact of individual spectroscopic parameters evaluation (K) Simulation with GEISA-03 (upper curve) Impact of replacement of HITRAN-04 or MIPAS PF3.2 H2O data in GEISA-03(differences (K) in lower curves), with associated standard IASI noise at T=280 K. Air broadened half-widths evaluation Impact of replacement of HITRAN-04 or HITRAN-06 H2O air broadened half-widths in GEISA-03 Intensity evaluation Impact of replacement of HITRAN-04 or HITRAN-06 H2O intensities in GEISA-03 TITAN and Cassini-Huygens/CIRS (Composite INfraRed Spectrometer) Assessment of GEISA-08 edition updated molecular species* for CIRS obervation modelisations * Selected molecular species: CO2, C2H2, C2H6, HCN, HC3N, C4H2, C3H4, C2H4, C2HD, C6H6 HC3N NEW LINE LIST cm-1 GEISA 03 line list Courtesy of A. Jolly DETECTION OF C2HD C2HD 5 No C2HD HC3N C6H6 CO2 New molecule in GEISA-08 Courtesy of A. Coustenis CIRS OBSERVATIONS MODELISATION HCN C2H2 C3H8 With GEISA-08 HCN C2H2 C3H8 HC15N With GEISA-03 References: A. Jolly et al. « New infrared Intensities and extensive line list for the HC3N bending modes, J. Mol. Spectrosc. 242, 1, pp 46-54, March 07 A. Coustenis et al. « Detection of C2H2 and D/H ratio on Titan. Icarus, in Press (2008) A. Coustenis et al. Titan trace gaseous composition from CIRS: three years into the Cassini-Huygens mission. In preparation

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