Cold and Warm Extreme Events in Shijiazhuang and Climate Warming
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Abstract:
Using daily air temperature data of Shijiazhuang from 1955 to 2002,the thresholds of extrema are estimated in terms of the 95th and the 5th percentiles,and the temperature extrema are identified. Analysis of cold and warm extreme events occurred in 2002 in Shijiazhuang shows that the above-mentioned schemes can effectively identify temperature extrema. The calculated temperature trend rates show that the climate in Shijiazhuang had obviously warming trends. With the climate warming,the continual and record-broken high temperature events increased;the cold period tended to shorten,cold days to decrease and warm days to increase. The relation of temperature extreme events and climate warming in Shijiazhuang is studied by using the correlative analysis method. The decrease of extreme cold days was most obvious. The urbanization effect enhanced climate-warming rates in the urban area,and especially the variation of the daily lowest temperature was most evident. The increasing/decreasing of warm/cold events was quicker in the urban area than in suburb. Under the background of climate warming,the decrease of cold events in winter and their potential impacts on human being must be paid special attention.
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Clc Number:
P467
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Supported by:Beijing E-Tiller Technology Development Co., Ltd.
Supported by:Beijing E-Tiller Technology Development Co., Ltd.