Underestimates of O3 9.6 micron heating rates as a cause of the cold bias in the low tropical stratosphere of GCMs

Details Underestimates of O3 9.6 micron heating rates as a cause of the cold bias in the low tropical stratosphere of GCMs Underestimates of O3 9.6 micron heating rates as a cause of the cold bias in the low tropical stratosphere of GCMs

Aug 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992angeo..10..619p&link_type=abstract

Annales Geophysicae (ISSN 0992-7689), vol. 10, no. 8, Aug. 1992, p. 619-624. Research supported by Freie Universitaet Berlin.

Physics

4

Atmospheric General Circulation Models, Middle Atmosphere, Ozone, Stratosphere, Tropical Regions, Climatology, Radiative Heat Transfer, Tropopause

Scientific paper

General circulation models (GCMs) which include the middle atmosphere show a cold bias in the low tropical stratosphere; the zonal-mean temperature minimum is around 10 K lower than the observed climatology, and the tropopause is too high. Evidence is presented that this could arise because of inadequate energy absorption by O3 at 9.6 microns. This is suggested by the results of modifying a GCM, which led to a decrease in the upwelling radiative flux at the tropopause. It is supported by the calculated changes in radiative heating rates when the energy input into the low stratosphere is reduced, and by the response of a fixed dynamical heating model to this flux change. It is proposed that an important topic of research is to develop accurate models of the 9.6 microns bands in the lower stratosphere.

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