An improved method for mesospheric ice temperature retrieval from 850 cm-1 libration and 3200 cm-1 vibration bands

Details An improved method for mesospheric ice temperature retrieval from 850 cm-1 libration and 3200 cm-1 vibration bands An improved method for mesospheric ice temperature retrieval from 850 cm-1 libration and 3200 cm-1 vibration bands

Dec 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010agufmsa14a..07p&link_type=abstract

American Geophysical Union, Fall Meeting 2010, abstract #SA14A-07

Physics

[0305] Atmospheric Composition And Structure / Aerosols And Particles, [0321] Atmospheric Composition And Structure / Cloud/Radiation Interaction, [0320] Atmospheric Composition And Structure / Cloud Physics And Chemistry

Scientific paper

A new method for retrieval of the temperature of mesospheric ice using two different in physical nature spectral bands of water-ice - the rotation band near 850 cm-1 and the O-H vibration band at 3200 cm-1, is presented.. A set of reference spectra for the least squares fitting procedure is compiled from available in literature experimental temperature dependent optical constants for water-ice. The method is applied to observations made by the Atmospheric Chemistry Experiment Fourier Transform Spectrometer (ACE-FTS) instrument on board Scisat-1. About 100 ACE-FTS measurements of bright polar mesospheric clouds in July 2005 have been processed with the new method. The mean ice temperature for these clouds is found to be about 131K, which is 4K lower than the mean ice temperature of these clouds retrieved from the O-H vibration band alone. The estimated total uncertainty in the ice temperature retrievals using both rotation and vibration bands is 8K, or less. This is about 4K lower than the uncertainty of the method that uses the 3200 cm-1 band alone, due to a significant reduction of the fitting error.

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