Atmospheric Chemistry and Physics Discussions www.atmos-chem-phys-discuss.net 1680-7367 1680-7375 9 3 2009 10.5194/acpd-9-13943-2009 http://www.atmos-chem-phys-discuss.net/9/13943/2009/ http://www.atmos-chem-phys-discuss.net/9/13943/2009/acpd-9-13943-2009.html http://www.atmos-chem-phys-discuss.net/9/13943/2009/acpd-9-13943-2009.pdf 13943 13997 2009-06-26 Daytime SABER/TIMED observations of water vapor in the mesosphere: retrieval approach and first results A. G. Feofilov artem-feofilov@cua-nasa-gsfc.info A. A. Kutepov W. D. Pesnell R. A. Goldberg B. T. Marshall L. L. Gordley M. García-Comas M. López-Puertas R. O. Manuilova V. A. Yankovsky S. V. Petelina J. M. Russell III The Catholic University of America, 620 Michigan Ave., Washington D.C. 20064, USA NASA Goddard Space Flight Center, Mailcode 674, Greenbelt Rd., Greenbelt, MD 20771, USA GATS Inc., 1164 Canon Blvd., Suite 101, Newport News, VA 23606, USA Instituto de Astrofísica de Andalucía (CSIC), C/Camino Bajo de Huetor, 50, Granada 18008, Spain Institute for Physics, St. Petersburg State University, Ulianovskaja, 1, St. Petersburg, 198904, Russia La Trobe University, Victoria, 3086, Australia Hampton University, Hampton, VA 23668, USA This paper describes a methodology for water vapor retrieval using 6.6 μm daytime broadband emissions measured by SABER, the limb scanning infrared radiometer on board the TIMED satellite. Particular attention is given to accounting for the non-local thermodynamic equilibrium (non-LTE) nature of the H₂O 6.6 μm emission in the mesosphere and lower thermosphere (MLT). The non-LTE H₂O (ν₂) vibrational level populations responsible for this emission depend on energy exchange processes within the H₂O vibrational system as well as on interactions with vibrationally excited states of the O₂, N₂, and CO₂ molecules. The paper analyzes current H₂O non-LTE models and, based on comparisons with the ACE-FTS satellite solar occultation measurements, suggests an update to the rate coefficients of the three most important processes that affect the H₂O(ν₂) populations in the MLT: a) the vibrational-vibrational (V–V) exchange between the H₂O and O₂ molecules; b) the vibrational-translational (V–T) process of the O₂(1) level quenching by collisions with atomic oxygen, and c) the V–T process of the H₂O(010) level quenching by collisions with N₂, O₂, and O. We demonstrate that applying the updated H₂O non-LTE model to the SABER radiances makes the retrieved H₂O vertical profiles in 50–85 km region consistent with climatological data and model predictions. 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