Atmospheric Measurement Techniques Discussions
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10.5194/amtd-3-203-2010
http://www.atmos-meas-tech-discuss.net/3/203/2010/
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http://www.atmos-meas-tech-discuss.net/3/203/2010/amtd-3-203-2010.pdf
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2010-01-15
Water vapour profiles from SCIAMACHY solar occultation measurements derived with an onion peeling approach
S. Noël
stefan.noel@iup.physik.uni-bremen.de
K. Bramstedt
A. Rozanov
H. Bovensmann
J. P. Burrows
Institute of Environmental Physics, University of Bremen, FB 1, P.O. Box 330440, 28334 Bremen, Germany
A new retrieval method has been developed to derive water vapour number
density profiles from solar occultation measurements of the SCanning Imaging
Absorption spectroMeter for Atmospheric CHartographY (SCIAMACHY).
This method is intentionally kept simple and based on a combination of an
onion peeling approach with a modified DOAS (Differential Optical Absorption
Spectroscopy) fit in the wavelength region around 940 nm.
Reasonable resulting water vapour profiles are currently obtained in the
altitude range 15–45 km.
Comparisons of the SCIAMACHY profiles with water vapour data provided by the
Atmospheric Chemistry Explorer Fourier Transform Spectrometer (ACE-FTS) show
an average agreement within about 5% between 20 and 45 km.
SCIAMACHY water vapour data tend to be systematically higher than ACE-FTS.
These results are in principal confirmed by comparisons with water vapour
profiles derived from model data of the European Centre for Medium Range
Weather Forecasts (ECMWF), although ECMWF concentrations are systematicly
lower than both corresponding SCIAMACHY and ACE-FTS data at all altitudes.
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