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近48年中国的季节变化与极端温度事件的联系

期刊名称：物理学报
时间：0
页码：150-150
语言：中文
分类：P425.42[天文地球—大气科学及气象学]
作者机构：[1]兰州大学大气科学学院,兰州730000, [2]国家气候中心气候研究开放实验室,北京100081
相关基金：国家自然科学基金（批准号：40875040 40930952）; 科技支撑项目（批准号：2007BAC29B01 2009BAC51B04）资助的课题
相关项目：季节变迁的非线性识别及其对全球增暖的响应

关键词：非线性相似度量方法, 季节变化, 极端温度, non-linear similarity method, seasonal changes, temperature extremes

中文摘要：

利用中国1961—2008年752个站点逐日温度、气压、相对湿度和降水量资料,采用非线性相似度量方法对中国四季进行了划分,对比分析了中国的8个区域与全国整体的季节变化.此外,研究了中国极端温度频次的年际变化,并通过相关分析和敏感性试验探讨了中国近48年四季变化与极端温度事件的联系.结果表明：1）随着全球变暖中国大部分地区春、夏季起始时间提前,持续时间延长;秋季起始时间变化不大,但持续时间延长;冬季起始时间推后,持续时间显著缩短.2）随着夏季延长,除华东以外中国大部分地区极端高温频次增加;随着冬季缩短,中国大部分地区极端低温频次下降,且下降趋势显著.3）极端高温和低温的存在及其年际变化是导致夏季、冬季持续日数变化的原因之一,也是导致夏季、冬季持续日数出现大幅波动的主要原因.

英文摘要：

With nonlinear similarity method, we divised the seasons for whole China on the basis of daily mean temperature, pressure, relative humidity and precipitation at 752 stations for the period 1961—2008, and analyze the seasonal division for eight regions of China and seasonal times. In addition, the relevant statistic data are established which contain the annual variation in frequency of extreme temperature in China. By combining these two research findings, their relationship over the past 48 years is found through correlation analysis and sensitivity test. The results show that：（1） in most areas of China, the spring and summer starting time move up, their durations are extended, autumn starting time changes a litter, and its duration is extended, while winter is pushed back the starting time, and its duration is shortened. （2） With the summer extending, the frequency of extreme high temperature is increased in most areas of China except East China, while the shortening of winter results in the frequency of extreme low temperature declining markedly. （3） The existence and the annual change of extreme high and low temperature are the reason why the lengths of summer and winter change, and they are also the main reason why the substantial fluctuations of the lengths of summer and winter take place.

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