北京最高和最低气温的非对称变化
THE ASYMMETRIC TREND OF CHANGE IN MAXIMUM AND MINMUM TEMPERATURE IN BEIJING
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摘要: 运用1940年以来北京各个月历年逐日最高和最低气温以及年平均气温资料,研究其总变化趋势和年际变化,结果表明:1月份最低气温的线性增加率为4.08℃/100a;7月份最高气温以-0.245℃/100a的递减率线性降低.其结果导致日较差减小.另外揭示了对研究全球增暖有重要意义的事实:1940年代增暖主要在白天,1980年代增暖主要在夜间.Abstract: The maximum. minimum and mean temperature in Beijing since 1940 are selected.The general trend of change in these temperatures and the interannual change of temperatures are studied in this paper.The consequences are shown as follows:the linear rate of increase in minimum temperature in January is equal to 4.08℃/100a;the maximum temperature in July decrease with a linear rate -0.245℃/100a.So the diurnal temperature range (DTR) become small.In addition, a fact which is important for reserching on global warming has been discovered:the temperature warming occurs mainly in day time in 1940s;and the temperature increases in the night in 1980s.
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