【作者】 程炳岩； 周浩；

【Author】 CHENG Bingyan,ZHOU Hao(Chongqing Climate Center,Chongqing,401147,China)

【机构】 重庆市气候中心；

【摘要】 利用1961～2008年重庆冬季气温和美国NCEP/NCAR全球格点再分析资料,研究重庆冬季气温的气候特征及其与欧亚地区大气环流异常的关系。结果表明:近48年来重庆冬季气温上升趋势明显,变率达到0.14℃/10a,特别是近年来正处于偏暖时期。相关分析和合成分析发现,欧亚地区冬季大气环流异常与同期重庆气温存在密切的关系。欧亚大陆东北部和副热带地区是影响重庆冬季气温的关键区域。当这两个区域对流层高度场出现南北向"偶极子"型异常分布特征,重庆冬季气温将出显著的现异常变化。针对欧亚地区冬季高度场的"偶极子"型异常分布特征,定义用于诊断重庆冬季气温异常的影响因子。该因子与重庆冬季气温有显著的相关性,同时与欧亚和西太平洋遥相关型、北极涛动、亚洲区极涡、西太平洋副热带高压、青藏高原高度场等冬季的气候因子有紧密的联系。说明该因子能表征冬季欧亚地区乃至北半球大气环流异常对重庆冬季气温的影响。冬季欧亚大气环流的异常势必对重庆冬季气温有显著影响。更多还原

【Abstract】 The characteristic of winter temperature in Chongqing and its relationship with the atmospheric circulation abnormal in Eurasian region is analyzed by using the temperature data in Chongqing weather station and NCEP/NCAR reanalysis data.The results show that:(1) During the last 48 years,temperature of Chongqing has an obvious ascending trend with a changing rate of 0.14°C/10a.And now it is in a warm period.(2) According to the correlation and composite analysis,we found that the changing of winter temperature in Chongqing is close related with two key region,East-north part of Eurasian and subtropical region.When the dipole mode occurs during winter in upper troposphere of these two regions,obvious abnormal of winter temperature will occur in Chongqing.(3) An impact factor is defined to diagnosis the variation of winter temperature in Chongqing,This factor is connected with many climate systems in north hemisphere,such as the arctic oscillation,polar vortex,subtropical high,and teleconnection pattern of Eurasian and western pacific ocean etc.This factor has a good correlation with the winter temperature in Chongqing and it can reflect the influence of atmospheric circulation to the winter temperature in Chongqing.更多还原