January temperature anomalies over Northeast China and precursors  

作　　者：LI Chao ZHANG QingYun 

机构地区：[1]International Center for Climate and Environment Sciences,Institute of Atmospheric Physics,Chinese Academy of Sciences [2]Graduate University of the Chinese Academy of Sciences [3]State Key Laboratory of Numerical Modeling for Atmospheric Sciences and Geophysical Fluid Dynamics,Institute of Atmospheric Physics,Chinese Academy of Sciences

出　　处：《Chinese Science Bulletin》2013年第6期671-677,共7页

基　　金：supported by the China Meteorological Administration Special Public Welfare Research Fund (GYHY201106015 and GYHY20090614);the National Basic Research Program of China (2009CB421401);the National Science and Technology Supporting Program of China (2009BAC51B02)

摘　　要：This paper analyzes the large-scale atmospheric circulation characteristics of anomalous cases of January temperatures that occurred in Northeast China during 1960-2008 and precursory oceanic conditions.The January monthly mean surface air temperature(SAT) anomalies and the duration of low temperature are used to define temperature anomaly cases.The anomalous cyclonic circulation over northeast Asia strengthens the northerly flow in cold Januarys,while the anomalous anticyclonic circulation weakens the northerly flow in the warm Januarys.The negative(positive) North Pacific sea surface temperature anomaly(SSTA) and increased(decreased) sea ice concentration in the Barents-Kara seas in the preceding month are probably linked to the cyclonic(anticyclonic) circulation pattern over northeast Asia in the cold(warm) cases.Further analyses indicate that the preceding oceanic conditions play distinct roles in the SAT anomalies over Northeast China on different time scales.Strong relationships exist between North Pacific SSTA and the SAT in Northeast China on the interannual time scale.On the other hand,the sea ice concentration is more closely associated with the interdecadal variations of SAT in Northeast China.This paper analyzes the large-scale atmospheric circulation characteristics of anomalous cases of January temperatures that oc- curred in Northeast China during 1960-2008 and precursory oceanic conditions. The January monthly mean surface air tempera- ture （SAT） anomalies and the duration of low temperature are used to define temperature anomaly cases. The anomalous cyclonic circulation over northeast Asia strengthens the northerly flow in cold Januarys, while the anomalous anticyclonic circulation weakens the northerly flow in the warm Januarys. The negative （positive） North Pacific sea surface temperature anomaly （SSTA） and increased （decreased） sea ice concentration in the Barents-Kara seas in the preceding month are probably linked to the cy- clonic （anticyclonic） circulation pattern over northeast Asia in the cold （warm） cases. Further analyses indicate that the preceding oceanic conditions play distinct roles in the SAT anomalies over Northeast China on different time scales. Strong relationships exist between North Pacific SSTA and the SAT in Northeast China on the interannual time scale. On the other hand, the sea ice concentration is more closely associated with the interdecadal variations of SAT in Northeast China.

关 键 词：中国东北地区 东北亚地区 温度异常 年际时间尺度 气旋性环流 前体 大气环流特征 海洋条件 

分 类 号：P423[天文地球—大气科学及气象学]