大气科学2017，Vol.41Issue(4)：869-881,13.DOI:10.3878/j.issn.1006-9895.1612.16228
冬季南极涛动对欧亚大陆地表气温的影响
Influence of the Antarctic Oscillation on Surface Air Temperature over the Eurasian Continent during Boreal Winter
摘要
Abstract
Based on the NCEP/NCAR daily reanalysis data over the period from 1962 to 2011,this study reveals the relationship between Antarctic Oscillation (AAO) and surface air temperature over the Eurasian continent during the boreal winter.The linear regression results show that after filtering out the E1 Nino-Southern Oscillation (ENSO) signal,the AAO in January is significantly and positively correlated with the air temperature over the Eurasian continent in February.When a stronger AAO occurs in January,positive geopotential height anomaly appears over the southeastern Pacific and enhances the subtropical high in the southern Hemisphere.Furthermore,it extends northward to the eastern Pacific and persists from January to February,which acts as the key circulation in the inter-hemispheric interaction.In February,the eastern Pacific geopotential height anomaly tilts northward with altitude and anchors over southwestern America in the upper troposphere,which is right at the entrance of the climatological North Atlantic storm track.The geopotential height anomaly at southwestern America is positively correlated with the transient eddy activities over the northwestern Mediterranean Sea,which can trigger a negative geopotential height anomaly over the Scandinavian.Due to the downstream dispersion of wave energy originated from the Scandinavian geopotential height anomaly,positive anomaly develops to the west of the Lake Baikal and the negative phase of the Scandinavian pattern forms with increased westerlies around 60°N.The increased westerlies can suppress the southward invasion of cold air and thus are favorable for the development and maintenance of above-normal temperature over Eurasian continent,and vice versa.关键词
南极涛动/地表气温/高频瞬变涡动反馈强迫/波作用通量Key words
Antarctic Oscillation/Surface air temperature/High-frequency transient eddy feedback forcing/Wave activity flux分类
天文与地球科学引用本文复制引用
张乐英,徐海明,施宁..冬季南极涛动对欧亚大陆地表气温的影响[J].大气科学,2017,41(4):869-881,13.基金项目
国家自然科学基金项目41575057、 41575077、 41490643,江苏省333高层次人才培养工程BRA2015290,江苏省高校自然科学研究重大项目15KJA170004,江苏省研究生创新计划项目KYLX15-0860 National Natural Science Foundation of China (NSFC) (Grants 41575057,41575077,41490643),"333" Project of Jiangsu Province (Grant BRA2015290),Natural Science Foundation of High Education of Jiangsu Province (Grant 15KJA170004),Innovation Project for Graduate Student of Jiangsu Province (Grant KYLX15-0860) （NSFC）
