A comparison of observed (HALOE) and modeled (CCM2) methane and stratospheric water vapor

Details A comparison of observed (HALOE) and modeled (CCM2) methane and stratospheric water vapor A comparison of observed (HALOE) and modeled (CCM2) methane and stratospheric water vapor

Jul 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993georl..20.1419m&link_type=abstract

Geophysical Research Letters (ISSN 0094-8276), vol. 20, no. 14, p. 1419-1422.

Physics

11

Atmospheric Models, Halogens, Methane, Stratosphere, Upper Atmosphere Research Satellite (Uars), Water Vapor, Climate, Experiment Design

Scientific paper

Recent measurements (21 September-15 October 1992) of methane and water vapor by the Halogen Occultation Experiment (HALOE) on the Upper Atmosphere Research Satellite (UARS) are compared with model results for the same season from a troposphere-middle atmosphere version of the National Center for Atmospheric Research (NCAR) Community Climate Model (CCM2). Several important features of the two constituent fields are well reproduced by the CCM2, despite the use of simplified methane photochemistry in the CCM2 and some notable differences between the model's zonal mean circulation and climatology. Observed features simulated by the model include the following: 1) subsidence over a deep layer in the Southern Hemisphere polar vortex; 2) widespread dehydration in the polar vortex; and 3) existence of a region of low water vapor mixing ratios extending from the Antarctic into the Northern Hemisphere tropics, which suggests that Antarctic dehydration contributes to midlatitude and tropical dryness in the stratosphere.

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