亚非副热带西风急流入口区位置及动能异常对中国华北盛夏年代际干旱的影响

魏建宁,张杰

Influence of the Position and Kinetic Energy Anomalies of the Inlet Region of the Asian-African Subtropical Westerly Jet on the Mid-Summer Interdecadal Drought in North China

Jianning WEI,Jie ZHANG

图9 1979 -2015年7月和8月动能的气候态（a, b）及其变化趋势（c, d）（彩色区， 单位: ×10-5 m2·s-2） 矢量为T-N波作用通量, 红线和黑线分别为1979 -1997年、 1997 -2015年20 m·s-1平均西风位置

Fig.9 Climatic state (color area) of kinetic energy （a, b） and the trend of energy change （c, d） in July and August from 1979 to 2015.Unit: ×10-5 m2·s-2.Vector is T-N wave flux, The red line and the black line are respectively the average position of 20 m·s-1 of the subtropical westerly jet from 1979 to 1997 and from 1997 to 2015