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air temperature changes over the Tibetan Plateau and Other Regions in the Same Latitudes and the Role of Ozone Depletion

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Acta meteorologica Sinica 2009年第3期23卷 290-299页

作者：张人禾周顺武 State Key Laboratory of Severe Weather (LaSW) Chinese Academy of Meteorological Sciences Jiangsu Key Laboratory of Metrological Disaster Nanjing University of Information Sciences and Technology

Using radiosonde and satellite observations, we investigated the trends of air temperature changes over the Tibetan Plateau （TP） in comparison with those over other regions in the same latitudes from 1979 to 2002. It is shown that Over the TP, the trends of air temperature changes in the upper troposphere to lower stratosphere were out of phase with those in the lower to middle troposphere. air temperature decreased and a decreasing trend appeared in the upper troposphere to lower stratosphere. The amplitude of the annual or seasonal mean temperature decreases over the TP was larger than that over the whole globe. In the lower to middle troposphere over the TP, temperature increased, and the increasing trend was stronger than that over the non-plateau regions in the same latitudes in the eastern part of China. Meanwhile, an analysis of the satellite observed ozone data in the same period of 1979-2002 shows that over the TP, the total ozone amount declined in all seasons, and the ozone depleted the most compared with the situations in other regions in the same latitudes. It is proposed that the difference between the ozone depletion over the TP and that over other regions in the same latitudes may lead to the difference in air temperature changes. Because of the aggravated depletion of ozone over the TP, less （more） ultraviolet radiation was absorbed in the upper troposphere to lower stratosphere （lower to middle troposphere） over the TP, which favored a stronger cooling in the upper troposphere to lower stratosphere, and an intenser heating in the lower to middle troposphere over the TP. Therefore, the comparatively more depletion of ozone over the TP is possibly a reason for the difference between the air temperature changes over the TP and those over other regions in the same latitudes.

关键词： the Tibetan Plateau air temperature changes ozone depletion

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