Physics
Scientific paper
Mar 1993
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993angeo..11..204s&link_type=abstract
Annales Geophysicae (ISSN 0992-7689), vol. 11, no. 2-3, p. 204-215.
Physics
17
Atmospheric Moisture, Paleoclimatology, Tropical Meteorology, Troposphere, Atmospheric Models, Atmospheric Temperature, Humidity, Snow, Water Vapor
Scientific paper
Average tropical sea surface temperatures during the last major glaciation may have been no more than about 1 C cooler than at present, while snow lines on high peaks may have descended 1 km, suggesting a drop in temperature of about 5 C in the mid-troposphere. This feature is likely to be characteristic, since the tropical atmosphere cannot sustain large horizontal temperature gradients. This implies that during the last glaciation the lapse rate in the lower half of the tropical troposphere was about 20 percent greater than at present. A reduction in the radiative cooling rate at these levels is required for such a reduction in static stability. A radiative-convective model with a physical parameterization for tropical convection is used to determine that only a significant increase in relative humidity in the middle and upper troposphere can cause the necessary increase in the lapse rate in the lower troposphere.
Lindzen Richard S.
Sun De-Zheng
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