武汉、合肥、南昌近40 a夏季高温变化特征及其与前期海温异常的可能联系

The duration of high temperature of Wuhan,Hefei and Nanchang in recent 40 years and its possible connection with SSTA

选取长江中下游城市武汉、合肥、南昌3站1970年～2009年近40 a夏季(6～8月)高温资料,分析3市夏季高温特征.3市夏季高温日数有增加的趋势,月平均气温也逐步上升,但月平均日照时数在减少.计算1970年～2009年武汉、合肥、南昌夏季高温日数与1、3、5月海表温度场相关系数,结果表明:若1月热带中太平洋、北印度洋海表温度偏高,则武汉、合肥、南昌夏季高温日数偏多,若3、5月热带中太平洋、北太平洋海表温度偏高,则武汉、合肥、南昌夏季高温日数偏多,反之亦然.

This paper mainly analyzes the feature of high temperature of three cities along the midstream and downstream of Changjiang River： Wuhan , Hefei and Nanchang according to nearly 40 years＇ statistics in summer （from June to August） from 1970 to 2009. There existes the rising trend of duration of high temperature days , with monthly average temprature rising and monthly average hours of sunshine declining. After the calculation of related coefficient,we can draw a conclusion that there is a connection between the sea surface temperature and the duration of high temperature in the three cities. If the temperature of tropical Pacific and North Indian Ocean is on the high side in January, then the duration of high temperature is longer in the three cities, while if that of tropical Pacific and North is on the high side in March and May , the duration of high temperature is longer than usual as well , vice versa.