Effect of Large-scale Circulation Anomalies on Summer Rainfall over the Yangtze River Basin: Tropical vs. Extratropical

温带气旋 反气旋 气候学 异常(物理) 地质学 对流层 纬度 中纬度 构造盆地 古生物学 大地测量学 凝聚态物理 物理
作者
Xinyu Li,Riyu Lu,Xidong Wang
出处
期刊:Journal of Climate [American Meteorological Society]
卷期号:36 (13): 4571-4587 被引量:1
标识
DOI:10.1175/jcli-d-22-0717.1
摘要

Abstract This study investigates the tropical and extratropical circulation anomalies that directly affect the summer rainfall over the Yangtze River basin (YRB). In the lower troposphere, the tropical circulation anomalies that enhance the YRB rainfall manifest as an anticyclonic anomaly over the tropical western North Pacific (WNP) and the extratropical circulation anomalies are characterized by northeasterly anomalies to the north of the YRB. It is found that the heavier the YRB rainfall, the more necessary the cooperation between the tropical WNP anticyclonic anomaly and the midlatitude northeasterly anomalies, and compared to the tropical WNP anticyclonic anomaly, the midlatitude northeasterly anomalies can more efficiently induce the YRB rainfall. Further results indicate that the tropical WNP anticyclonic anomaly exhibits notable quasi-biweekly feature and provides a favorable background for the enhanced YRB rainfall. By contrast, the northeasterly anomalies are dominated by synoptic variability. Furthermore, there are significant precursor signals for the lower-tropospheric northeasterly anomalies. These signals manifest as the eastward propagation of two wave trains in the upper troposphere: a midlatitude one and a high-latitude one, which tend to be independent. The midlatitude one originates around the Mediterranean Sea and propagates eastward along the Asian westerly jet. The high-latitude one propagates over the high-latitude Eurasian continent, from Europe eastward to Lake Baikal and then southeastward to East Asia.
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