CH4 and N2O photochemical lifetimes in the upper stratosphere - In situ estimates using SAMS data

Details CH4 and N2O photochemical lifetimes in the upper stratosphere - In situ estimates using SAMS data CH4 and N2O photochemical lifetimes in the upper stratosphere - In situ estimates using SAMS data

Apr 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991georl..18..677s&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 18, April 1991, p. 677-680.

Computer Science

Sound

4

Atmospheric Composition, Life (Durability), Methane, Nitrous Oxides, Photochemical Reactions, Stratosphere, Atmospheric Chemistry, Atmospheric Sounding, Black Body Radiation, Greenhouse Effect, Infrared Windows

Scientific paper

Upper stratospheric photochemical lifetimes are estimated in situ for CH4 and N2O for the first time, based on an analysis technique using 3 years of satellite measurements from the Stratospheric And Mesospheric Sounder (SAMS) instrument. The technique involves investigation of the time dependence of tracers injected into high northern latitudes in late winter and their subsequent photochemical decay during the dynamically quiescent summer stratosphere. Dynamical corrections are made for mean meridional circulation contributions. The lifetimes for N2O at 2 and 7 hPa (about 43 and about 35 km altitude) are found to be 1.7 and 8.3 months, respectively. For CH4, 0.6 (about 52 km altitude) and 2 hPa lifetimes are 3.3 and 3.4 months, respectively. These observed values are in good agreement with model calculations by Solomon et al. (1986).

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