Atmospheric Chemistry and Physics www.atmos-chem-phys.net 1680-7316 1680-7324 9 24 2009 10.5194/acp-9-9433-2009 http://www.atmos-chem-phys.net/9/9433/2009/ http://www.atmos-chem-phys.net/9/9433/2009/acp-9-9433-2009.html http://www.atmos-chem-phys.net/9/9433/2009/acp-9-9433-2009.pdf 9433 9447 2009-12-15 H₂¹⁶O and HDO measurements with IASI/MetOp H. Herbin herve.herbin@univ-lille1.fr D. Hurtmans C. Clerbaux L. Clarisse P.-F. Coheur Spectroscopie de l'Atmosphère, Service de Chimie Quantique et de Photophysique, Université Libre de Bruxelles, Brussels, Belgium UPMC Univ. Paris 06; Université Versailles St-Quentin; CNRS/INSU, LATMOS-IPSL, Paris, France now at: Laboratoire d'Optique Atmosphérique, Université des Sciences et Technologies de Lille, 59655 Villeneuve d'Ascq cedex, France respectively Research Associate and Scientific Research Worker with the F.N.R.S., Belgium In this paper we analyze distributions of water vapour isotopologues in the troposphere using infrared spectra recorded by the Infrared Atmospheric Sounding Interferometer (IASI), which operates onboard the Metop satellite in nadir geometry. The simultaneous uncorrelated retrievals of H₂¹⁶O and HDO are performed on radiance measurements using a line-by-line radiative transfer model and an inversion procedure based on the Optimal Estimation Method (OEM). The characterizations of the retrieved products in terms of vertical sensitivity and error budgets show that IASI measurements contain up to 6 independent pieces of information on the vertical distribution of H₂¹⁶O and up to 3.5 for HDO from the surface up to the upper troposphere (0–20 km). Although the purpose of the paper is not validation, a restricted comparison with sonde measurements shows that the retrieved H₂¹⁶O profiles capture the seasonal/latitudinal variations of the water content, with good accuracy in the lowest layer but with larger uncertainties higher in the free and upper troposphere. Our results then demonstrate the ability of the IASI instrument to monitor atmospheric isotopologic water vapour distributions and to provide information on the partitioning of HDO as compared to H₂¹⁶O. The derivation of the &delta;_<i>D</i> is challenging and associated with large errors in the uncorrelated retrieval approach chosen here. 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