Evidence for CH4 7.6 μm non-local thermodynamic equilibrium emission in the mesosphere

Details Evidence for CH4 7.6 μm non-local thermodynamic equilibrium emission in the mesosphere Evidence for CH4 7.6 μm non-local thermodynamic equilibrium emission in the mesosphere

Feb 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005georl..3204805l&link_type=abstract

Geophysical Research Letters, Volume 32, Issue 4, CiteID L04805

Computer Science

Sound

4

Atmospheric Composition And Structure: Middle Atmosphere: Composition And Chemistry, Atmospheric Composition And Structure: Airglow And Aurora, Atmospheric Composition And Structure: Chemical Kinetic And Photochemical Properties

Scientific paper

We present unequivocal evidence for CH4 7.6 μm non-local thermodynamic equilibrium (non-LTE) mesospheric emissions as measured by the Michelson Interferometer for Passive Atmospheric Sounding (MIPAS) experiment on board the ESA Envisat satellite. We have employed non-LTE radiative transfer models, already used and validated in studies of other atmospheric gases, in order to quantify the magnitude and extent of the CH4 non-LTE deviation in the Earth's atmosphere. The observed daytime enhancement signatures apparent in the measured radiances cannot be attributed to enhanced daytime temperatures and/or CH4 abundance variations and are reproduced successfully with a dedicated CH4 non-LTE radiative transfer model. We conclude that, depending on the upper stratospheric/mesospheric temperature structure, the departure from LTE might commence at an altitude as low as 45 km, reaching limb radiance deviations of 20% at 60 km and quickly rising up to 60% at 70 km, for the 7.6 μm CH4 lines.

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