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陈芳丽, 黎伟标. 北半球大气遥相关型冬夏差异及其与温度场关系的探讨[J]. 大气科学, 2009, 33(3): 513-523. DOI: 10.3878/j.issn.1006-9895.2009.03.09
引用本文: 陈芳丽, 黎伟标. 北半球大气遥相关型冬夏差异及其与温度场关系的探讨[J]. 大气科学, 2009, 33(3): 513-523. DOI: 10.3878/j.issn.1006-9895.2009.03.09
CHEN Fangli, LI Weibiao. Difference of the Atmospheric Teleconnection Patterns between Winter and Summer over the Northern Hemisphere and Its Relation with the Air Temperature Fields[J]. Chinese Journal of Atmospheric Sciences, 2009, 33(3): 513-523. DOI: 10.3878/j.issn.1006-9895.2009.03.09
Citation: CHEN Fangli, LI Weibiao. Difference of the Atmospheric Teleconnection Patterns between Winter and Summer over the Northern Hemisphere and Its Relation with the Air Temperature Fields[J]. Chinese Journal of Atmospheric Sciences, 2009, 33(3): 513-523. DOI: 10.3878/j.issn.1006-9895.2009.03.09

北半球大气遥相关型冬夏差异及其与温度场关系的探讨

Difference of the Atmospheric Teleconnection Patterns between Winter and Summer over the Northern Hemisphere and Its Relation with the Air Temperature Fields

  • 摘要: 利用55年的NCEP/NCAR再分析资料, 采用合成分析等方法探讨了冬、 夏季北半球大气遥相关型的差异及其与温度场的关系。主要结果有: 北半球冬、 夏季典型的大气遥相关型具有很大的差异, 且大气遥相关路径的偏折与温度场的变化有密切的关系。北半球冬季, 呈经向型分布特征的大气遥相关路径在温度纬向梯度正负号发生改变处发生偏折; 而在北半球夏季, 由于温度场分布呈现纬向特征, 遥相关路径不易产生南北向的偏折, 从而使得异常中心基本上沿纬圈分布, 呈明显的纬向特征。此外, 由于冬季等温线南北起伏明显的区域往往位于东西方向海陆交界处, 因此冬季大气遥相关路径往往在东西向海陆交界处发生偏折。

     

    Abstract: The different features of the atmospheric teleconnection patterns between winter and summer over the Northern Hemisphere (NH) and their relations with the air temperature fields are studied using the 55 years NCEP/NCAR reanalysis data. It is found that there are obvious differences in the routes of the atmospheric teleconnection between winter and summer over the NH. The teleconnection route in winter exhibits meridional features while the teleconnection route is noticeably zonal in summer. Results also show that the deflection of teleconnection route is closely related to the zonal air temperature gradient. The teleconnection route deflects when the zonal air temperature gradient is zero, which may results in the difference of the teleconnection routes between winter and summer over the NH.

     

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