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MIPAS middle atmosphere water vapor distributions

Maya Garcia-Comas(1), Manuel López-Puertas(1), Bernd Funke(1), Diego Bermejo-Pantaleón(1), Gabriele Stiller(2), Udo Grabowski(2) and Thomas von Clarmann(2)

(1) Instituto de Astrofísica de Andalucía-CSIC, Apdo. 3004, 18080 Granada, Spain
(2) Institut für Meteorologie und Klimaforschung, Postlach 36 40, 76021 Karlsruhe, Germany

Abstract

Water vapor is a key constituent of the middle atmosphere. It is involved in the ozone chemistry, it is the precursor of PSCs and NLCs, and it is an infrared cooler in the stratosphere. The Michelson Interferometer for Passive Atmospheric Sounding (MIPAS) onboard Envisat observes the H2O infrared emissions with high resolution up to the mesopause. We have derived water vapor abundance from MIPAS spectra using the IMK/IAA data processor, which includes the GRANADA non-LTE algorithm. That allows for accurate H2O retrievals in the atmospheric regions where its emissions are affected by non-LTE, i.e., above 50km and particularly in the polar summer. In this paper, we describe the information gained from MIPAS spectra about the non-LTE processes affecting the H2O infrared emissions, discuss its uncertainties and present preliminary MIPAS pole-to-pole distributions of water vapor retrieved from the stratosphere to the upper mesosphere. We pay special attention to its behavior in the polar summer mesosphere, where the presence of NLCs and particular dynamical events may perturb the H2O vertical distribution. We also compare our results with those from global circulation models and other independent measurements.

 

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