摘要
统计整理了河南省开封市近50年极端最高温度、极端最低温度等气候要素变化情况。运用滑动平均算法和小波算法结合分析,揭示了开封地区极端温度多时间尺度的复杂结构,并分析了极端温度变化的周期。得到以下结论:开封市极端最高温度变化具有5年、13年左右的显著周期,而极端最低气温则以7年左右的周期最显著。研究还发现:年极端温度气候的变化特征具有地域特殊性,与全球变暖的趋势不一致。极端高温在年际尺度上均表现出以降温为主要特征的变化趋势,年极端最低气温则表现出升温为主要特征的变化趋势,气温在比以前更小的范围变动。
Based on the data of daily temperature from year 1960 to 2005, some climatic indexes are made including extremely maximum temperature, extremely minimum temperature. With moving average algorithm and wavelet algorithm the multi-time scale complex structure of climatic change is revealed, the periodic changes of extreme climate change are analyzed. The major conclusions are summarized as follows： the period of extreme maximum climatic change in Kaifeng city has 5 and 13 years periods and extreme minimum climatic change has 7 years periods. And the variation of extreme climatic change in Kaifeng city is rational, which is different from the trend of the global warming. The annual extreme maximum temperature is obviously falling, and the annual extreme minimum temperature is obviously ascending. So it means the temperature has changed in less than previous scope. In other words, the extreme air temperature event reduces and occurrence degree gets down.
出处
《辽宁工程技术大学学报（自然科学版）》
CAS
北大核心
2009年第A02期178-180,共3页
Journal of Liaoning Technical University (Natural Science)
基金
辽宁工程技术大学科研立项“城市气候变化特征及污染气象分析”(Y200800803)
