1960-2012年中国东部冬季风时期极端降温事件的时空特征
投稿时间:2019-07-19  修订日期:2019-10-27  点此下载全文
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蔡倩 南京信息工程大学 气象灾害教育部重点实验室/气候与环境变化国际合作联合实验室/气象灾害预报预警与评估协同创新中心 1239960903@qq.com 
管兆勇 南京信息工程大学 气象灾害教育部重点实验室/气候与环境变化国际合作联合实验室/气象灾害预报预警与评估协同创新中心 guanzy@nuist.edu.cn 
徐蒙 南京信息工程大学 气象灾害教育部重点实验室/气候与环境变化国际合作联合实验室/气象灾害预报预警与评估协同创新中心  
基金项目:国家自然科学基金项目(面上项目,重点项目,重大项目)
中文摘要:利用1960-2013年中国753个站逐日日平均气温资料,对中国东部冬季风时期极端降温事件进行了定义,并研究了近53年中国东部冬季风时期极端降温事件的时空特征。结果发现,极端降温事件发生最频繁的地区位于东北南部、华北大部分地区和华中北部,华中南部则较少发生。过去的53个冬季风时期,中国东部极端降温事件普遍减少,且东北南部、华北南部和东部、华中北部以及华东北部的减少趋势最为明显,减小幅度可达0.4-0.8次/10a。此外,东北、华北和华中的极端降温事件发生频次分别在1980、1973、1969年出现了由多到少的突变。极端降温事件的强度也存在空间差异,其平均强度从北到南呈现出强-弱-较强的特点。这些结果有利于人们深刻认识近几十年我国极端事件的特征并为冷害防范决策提供科学依据。
中文关键词:中国东部  极端降温过程事件  时空特征  冬季风时期
 
Analysis of Temporal and Spatial Characteristics of Extreme Cooling Events in Winter Monsoon Period in Eastern China during 1960-2012
Abstract:Based on the daily mean temperature data of 753 stations in China from 1960 to 2013, the extreme cooling events in winter monsoon period over eastern China was defined and its temporal and spatial characteristics in eastern China in the recent 53 years were studied. Results showed that extreme cooling events occurred most frequently in the south of Northeast China, most part of North China and the north of Middle China and least in the south of Middle China. In the past 53 winter monsoon periods, extreme cooling events in eastern China were generally decreasing and the decreasing trends were most obvious in the south of Northeast China, southern and eastern parts of North China, northern parts of Middle China and East China with a reduction of 0.4-0.8 times per decade. In addition, the frequencies of extreme cooling events in Northeast China, North China, and Middle China experience a sudden decrease in 1980, 1973, and 1969, respectively. A spatial difference in the intensities of extreme cooling events was also found with a strong-weak-strong pattern of average intensities from north to south. These results are conducive to deepen people's understanding of the characteristics of extreme events in China in recent decades and provide a scientific basis for decision-making of chilling injury prevention.
keywords:Eastern China  Extreme cooling process events  Spatiotemporal characteristics  winter monsoon period
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