To analyze the effects of the North Atlantic Oscillation(NAO)on winter climate in northeastern China in re-cent decades,CN05.1 high-resolution grid point temperature data,NCEP/NCAR reanalysis data,and NAO index from 1969 to 2019 are used.The influence of NAO on winter temperature in northeastern China was analyzed by Empirical Orthogonal Function,correlation analysis and composite analysis.The results show that:(1)There is a close relation-ship between winter temperature and NAO in northeastern China,that is,when the winter NAO is positive,the winter temperature in northeastern China is higher,and vice versa.(2)The winter NAO can propagate to East Asia through fluctuations,thus affecting the East Asian winter atmospheric circulation.The North Atlantic region is a strong disper-sion region for wave activity fluxes,and there is an eastward propagation path for the horizontal wave action in this strong dispersion region,which propagates southward to the North African region and then northward to the western Asian re-gion,and then to the East Asian region and southward to the Pacific region.(3)The NAO anomaly in winter will affect the winter temperature in northeastern China by affecting the tropospheric circulation factors.Specifically,when the North Atlantic oscillation is a positive anomaly,the influence leads to a geopotential height positive anomaly over north-ern East Asia,and the East Asian winter monsoon weakens.At this time,there is an anticyclone circulation in the mid-dle and lower troposphere,which is dominated by subsidence,resulting in warmer temperatures in the northeast of Chi-na,while the opposite is true when the North Atlantic Oscillation is a negative anomaly.
North Atlantic OscillationNortheastern Chinawinter temperatureclimate changetemporal and spatial variation
NETL
NSTL
万方数据
