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Water Vapor Profiles from SCIAMACHY lunar occultation measurements

Faiza Azam(1), Klaus Bramstedt  (1), Alexei Rozanov(1), Heinrich Bovensmann(1) and John Burrows(1)

(1) Institute Of Environmental Physics, Otto-Hahn-Alle 1, D-28334 Bremen, Germany


The spectrometer SCIAMACHY (Scanning Imaging Absorption spectroMeter for Atmospheric ChartographY) on-board Envisat measures solar irradiances and the earthshine radiances from the UV to the NIR (240nm – 2380nm) spectral region in nadir, limb and solar/lunar occultation geometry yielding total columns as well as vertical profiles of atmospheric trace gases specially in the stratosphere.

SCIAMACHY lunar occultation measurements are performed in the southern hemisphere between 30° and 90° during local night time. In our study, using retrieval code Sciatran 3.0 as radiative transfer code as well as retrieval code (an optimal estimation scheme), for the first time the lunar occultation measurements are used to derive vertical profiles of stratospheric water vapor from 15 to 50 km in the NIR spectral range. Preliminary sensitivity studies and comparisons with satellite instruments are presented here. Lunar occultation water vapor profiles will improve the understanding of the physical and chemical processes in the Southern hemisphere.