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夏季欧亚中高纬大气低频振荡的纬向传播特征

, PP. 1220-1230

Keywords: 10~30d低频振荡,欧亚中高纬度,传播特征,环流实体

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Abstract:

?基于NCEP/NCAR再分析资料,运用经验正交函数分解、线性回归和位相分析等方法,分析了夏季(5~8月)欧亚中高纬度地区主要低频周期的低频环流的纬向传播特征,并对其环流实体进行了探讨.分析结果表明,夏季欧亚中高纬度对流层中层(500hPa)的低频振荡周期主要集中在10~30d,该低频振荡同时存在明显的经向(向南)和纬向(向西)传播特征.着重分析其中的纬向传播特征后得出,其纬向平均传播速度约为9~10经度d-1.进一步分析表明,在东半球,北半球夏季极涡的最南端随10~30d的低频位相向西顺时针偏转.表征东半球大槽位置的5400,5500gpm等值线最南端,其随低频振荡位相亦有明显向西移动的特征.其中,5500gpm等值线最南端的移动速度也约为9~10经度d-1.此外,10~30d的低频冷空气也存在着随低频位相向西传播的特征.欧亚中高纬度低频振荡环流的向西传播是极涡向西顺时针旋转现象在低频尺度上的体现.与极涡或槽脊活动密切相连的冷空气即为夏季欧亚中高纬度10~30d低频振荡的环流实体.

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