Evidence for N2O ν3 4.5 μm non-local thermodynamic equilibrium emission in the atmosphere

Details Evidence for N2O ν3 4.5 μm non-local thermodynamic equilibrium emission in the atmosphere Evidence for N2O ν3 4.5 μm non-local thermodynamic equilibrium emission in the atmosphere

Jan 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007georl..3402825l&link_type=abstract

Geophysical Research Letters, Volume 34, Issue 2, CiteID L02825

Physics

3

Atmospheric Composition And Structure: Middle Atmosphere: Composition And Chemistry, Atmospheric Composition And Structure: Radiation: Transmission And Scattering, Atmospheric Processes: Remote Sensing, Atmospheric Processes: Radiative Processes

Scientific paper

We present a clear evidence for N2O 4.5 μm non-local thermodynamic equilibrium (non-LTE) emissions in the daylight stratosphere and mesosphere from measurements by the MIPAS experiment on board Envisat. We have used non-LTE radiative transfer models in order to quantify the magnitude and extent of the non-LTE deviation of N2O(001) in the Earth's atmosphere. The departure from LTE in N2O during daytime commences at altitudes around 40-50 km, but have significant effects (10%) on daytime limb radiance down to tangent heights of 20 km. The enhancement increases rapidly with altitude, being 20-80% at 50 km, and reaching factors of 2-8 in the lower mesosphere. This study shows that the enhancement is mainly produced by absorption of solar radiation by N2O at 4.5 μm and by V-V collisions with N2(1). Non-LTE effects are also significant at nighttime, where LTE calculations overpredict N2O radiances by 10-20% at 40-55 km tangent heights.

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