2013年我国南方持续性高温天气及副热带高压异常维持的成因分析

本文利用NCEP再分析资料和逐日台站观测资料研究了2013年夏季我国南方地区持续高温天气时期内西太平洋副热带高压（以下简称西太副高）的异常特征，指出西太副高西伸、北抬并异常维持是导致南方地区罕见高温天气发生的直接原因，探究了影响其异常的中高纬环流及热带系统的活动，特别是对该年夏季热带环流，包括越赤道气流、赤道辐合带（Intertropical Convergence Zone，简称ITCZ）的异常，以及登陆台风异常集中等情况作了进一步分析，为深入研究持续高温的成因提供了一定的基础。

An Analysis on the Formation of the Heat Wave in Southern China and Its Relation to the Anomalous Western Pacific Subtropical High in the Summer of 2013

The NCEP reanalysis data and observational data are exploited to reveal the characteristics of the Western Pacific Subtropical High (WPSH) and its influence on the persistent heat wave that affected a vast area of southern China in the summer of 2013. The hot spell was mainly and directly caused by the influence of anomalies in the WPSH. In the present study, the features of the westward extension and northward shift of the WPSH and its persistency are studied; the anomalous atmospheric circulations over the mid- to high latitudes and over the tropics are also investigated. In particular, the influence of tropical circulation systems, such as the cross-equator flows, Intertropical Convergence Zone, and typhoon activities, are further examined. Results of the present study are helpful for better understanding of the formation of persistent heat waves in southern China.