2022年长江中下游夏季异常干旱高温事件之环流异常特征

郝立生, 马宁, 何丽烨

Circulation anomalies characteritics of the abnormal drought and high temperature event in the middle and lower reaches of the Yangtze River in summer of 2022

HAO Lisheng, MA Ning, HE Liye

图9 正常年份（a）与2022年（b）8月高、中和低纬度环流异常协同作用示意图 [“+、-”号代表500 hPa高度场正负距平（填色区，单位：dagpm）中心位置， 高纬地区箭头线代表EAP（TNF）的传播方向；低纬地区箭头线代表BSISO信号传播方向，沿线上的椭圆圈代表其传播时激发出的异常环流情况；588 dagpm线是副高外围轮廓线]

Fig.9 Schematic diagram of the synergistic effect of high， middle and low latitude circulation anomalies in August in normal years （a） and 2022 （b） （“+， -” represents the centers of 500 hPa height positive and negative anomaly （the color shaded， Unit： dagpm）， and the arrow line at high latitudes represents the propagation direction of the EAP （TNF）； and the arrow line at low latitudes represents the propagation direction of the BSISO signal， and the ellipse along the line represents the anomalous circulation excited by its propagation； the contour 588 dagpm is the outer contour of the subtropical high）