2010年江苏省连续性高温特点及成因分析

利用江苏省常规气象观测资料、1961—2010年全省73个站的历史高温资料以及NCEAP 2.5×2.5再分析资料,分析总结了江苏省高温天气气候特点及2010年高温情况,并在此基础上重点对2010年连续高温天气特点及成因进行了分析。结果表明:江苏省高温日数以7月最多(占高温总日数的44.1%)、8月次之(占29.2%);空间分布上呈西南部地区多,东部沿海少的特点;2010年8月连续高温频发,过程间隔时间短,且区域性连续高温时段主要集中在8月份,较多年平均偏晚,部分市县最高气温创当地有气象资料以来的历史新高;盛夏期间前期赤道辐合带不活跃,不利于副高北抬,是造成该年出梅后区域性连续高温偏晚的一个重要原因;而8月份南亚高压脊线位置偏南,强盛的副高持续控制江苏省,加上台风北上活动影响少,致使该月连续性高温频发。连续高温期间副高能快速恢复增强,促使连续性高温过程频繁且间隔时间短。

Analysis on characteristic and cause of continuous high temperature of Jiangsu province in 2010

Based on the conventional observation data and historical high temperature data of 73 stations as well as the 2.5°×2.5° reanalysis data of NCEP/ NCAR, the climate characteristics of high temperature weather and the high temperature case of 2010 in Jiangsu have been summarized, particularly the regional continuous high-temperatures of 2010 has been analyzed. The results show that high temperature days of Jiangsu appeared most frequently in July (44.1% of the total number of days), followed by August (29.2%). There are more high temperature days in the southwest region and less ones in the east coast. In 2010, the regional continuous high temperature period concentrated on August, but it was later compared to previous years,and the interval is shorter. The highest temperature in some local cities and counties broke record of the weather data. The early equatorial convergence zone was not active and the subtropical high was not conducive to move to the north, which was the main reasons of later presence of regional continuous high-temperature.The stronger subtropical high sustaining control of Jiangsu in August, and less influence of typhoon resulted in frequent high-temperature. Enhanced subtropical high can be quickly recovered, which made continuous high-temperature more frequent and its interval shorter.