ENSO与中国夏季年际气候异常关系的年代际变化

朱益民; 杨修群; 陈晓颖; 赵珊珊; 孙旭光

ENSO与中国夏季年际气候异常关系的年代际变化

1.
中国科学院大气物理研究所大气科学和地球流体力学数值模拟国家重点实验室(LASG), 北京 100029;解放军理工大学气象学院, 江苏南京 211101
2.
南京大学灾害性天气气候研究所, 江苏南京210093
3.
解放军理工大学气象学院, 江苏南京 211101
4.
中国气象局国家气候中心, 北京 100081

基金项目: 国家自然科学基金项目(40233028,40425009,4045010);中国科学院大气物理研究所大气科学和地球流体力学数值模拟国家重点实验室(LASG)开放课题共同资助

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出版历程
- 收稿日期: 2005-11-04
- 修回日期: 2006-02-18

INTERDECADAL VARIATION OF THE RELATIONSHIP BETWEEN ENSO AND SUMMER INTERANNUAL CLIMATE VARIABILITY IN CHINA

1.
State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China;Institute of meteorology, PLA University of Science and Technology, Nanjing 211101, China
2.
Institute of Severe Weather and Climate, Nanjing University, Nanjing 210093, China
3.
Institute of meteorology, PLA University of Science and Technology, Nanjing 211101, China
4.
National Climate Center, China Meteorological Administration, Beijing 100081, China

摘要

摘要: 利用热带太平洋海表温度和中国降水和气温站点观测资料,通过滑动相关分析,揭示了ENSO与中国夏季年际气候异常关系的年代际变化事实。结果表明:ENSO与中国夏季年际气候异常的关系既有稳定的方面,又存在年代际变化特征。稳定的关系表现在:处于发展阶段的ENSO事件往往造成华北夏季降水偏少;处于衰减阶段的ENSO事件则易引起长江流域及江南地区夏季降水偏多。而二者关系的年代际变化表现在:1970年代中后期,处于发展阶段的ENSO事件引起的夏季降水异常在华南地区由偏少变为偏多,东北地区则由偏多变为偏少,而江淮地区偏多的现象不再明显,华北和东北夏季气温异常也由偏冷转变为偏暖,而华南则有偏冷趋势;处于衰减阶段的ENSO事件引起的夏季降水异常在华北地区由偏多变为偏少,江淮地区降水由偏少变为正常甚至偏多,华北夏季气温异常则由偏冷变为偏暖,长江流域和华南也有偏暖趋势。利用NCEP/NCAR再分析资料合成分析表明,在不同的年代际背景下ENSO引起的东亚中高纬度大气环流异常型发生了明显改变是ENSO和降水气温关系发生年代际变化的原因。
- ENSO /
- PDO /
- 夏季降水气温 /
- 年际异常 /
- 年代际变化
Abstract: Interdecadal variation of the relationships between ENSO and the summer interannual climate variability in China is investigate by using techniques of sliding correlation analysis with the tropical Pacific SSTA and the observed surface air temperature and precipitation from stations in China.The results indicate that there are stable and robust relations that the Northern China is dryer during the developing phase of ENSO while the Yangtze River valley is wetter during the decaying phase of ENSO.On the other hand,interdecadal variations of the relations are also found in other regions.Over the time both prior to the Pacificdecadal climate shift(before the late 1970's)and after it(after the late 1970's),during the developing phasesof ENSO the summer precipitation anomaly in South China changed from below to above normal,whereas that in Northeast China changed from above to below normal;the summer surface air temperature anomaly inNorth and Northeast China changed from cooling to warming,whereas that in South China changed tocooling;during the decaying phases of ENSO the North China changed from wetter to dryer while the HuaiRiver valley changed from dryer to normal;North China,Yangtze River valley and South China tend to bewarmer.Based on the composite analysis of the NCAR/NCEP reanalyze datasets,significant differences existing in ENSO-related atmospheric circulation anomaly in East Asia during pre-and post-shift periods maybe responsible for the interdecadal variation of relationships between ENSO and surface air temperature and precipitation in China.
- ENSO /
- PDO /
- summer precipitation and temperature /
- interannual variability /
- Interdecadal variation

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