Physics
Scientific paper
Oct 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992georl..19.1927k&link_type=abstract
Geophysical Research Letters (ISSN 0094-8276), vol. 19, no. 19, p. 1927-1930.
Physics
80
Atmospheric Circulation, Ozone Depletion, Stratospheric Warming, Tropical Regions, Volcanoes, Infrared Absorption, Infrared Radiation, Philippines, Radiant Cooling
Scientific paper
Stratospheric aerosol from Mount Pinatubo heated the tropical lower stratosphere by about 0.3 K/day mainly due to absorption of terrestrial infrared radiation. This heating was dissipated by: (1) an observed increase in stratospheric temperatures, which enhanced the radiation cooling; (2) additional mean upward motion, observed for the aerosol cloud, which led to adiabatic cooling; and (3) reductions in ozone concentrations resulting from enhanced upward motions. Each of these processes operated on a different time scale: maximum temperatures were observed after about 90 days; maximum ozone losses of about -1.5 ppm occurred after 140 days when the enhanced vertical velocities effectively lifted the ozone profile by about 2 km. We believe this shows that ozone plays an important role in buffering vertical motion in the tropical lower stratosphere, and hence the residual Brewer Dobson circulation of the whole stratosphere.
Kinne Stefan
Prather Michael J.
Toon Brian O.
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