冬季北大西洋涛动对青藏高原水汽输送的影响

Effect of North Atlantic Oscillation on water vapor transport over the Tibetan Plateau in winter

基于1979—2014年欧洲中期天气预报中心全球大气再分析数据集(ERA-Interim)资料,分析冬季青藏高原(以下简称高原)水汽分布及输送特点,并探讨北大西洋涛动(NAO)对冬季高原水汽输送的影响。结果表明,冬季高原主体水汽分布特征呈南湿北干的形势,且高原主体区域东、西边界的水汽输送量与北大西洋涛动密切相关,NAO指数与西边界呈现正相关,与东边界呈现负相关。NAO对高原边界地区水汽输送的影响要强于高原主体区域,尤其NAO与高原西南及东南两区域的四个边界的水汽输送均有显著相关关系。

Based on the ERA-Interim reanalysis data from 1979 to 2014,the water vapor distribution and transport characteristics of the Tibetan Plateau(TP) in winter are analyzed,and the influence of the North Atlantic Oscillation(NAO) on the winter water vapor transport over the TP is discussed.The results show that the distribution characteristics of water vapor in the main part of the plateau in winter are wet in the south and dry in the north,and the water vapor transport in the eastern and western boundaries of the main region of the plateau is closely related to the NAO,and the NAO index is positively correlated with the western boundary,negatively correlated with the eastern border.The influence of NAO on water vapor transport in the plateau boundary area is stronger than that in the main region of the plateau.Especially for the southwestern and southeastern of the TP,NAO has a significant correlation with the water vapor transport at the four boundaries of these two regions.