近50年江苏省夏季高温热浪的时空分布特征分析

根据江苏省1955-2007年7-9月逐日最高气温资料,分别以日最高气温≥35℃的高温天数、持续3d、5d的高温过程、平均最高气温为指标,建立了各站点的高温日数、高温强度的时间序列。分析发现,该省20世纪90年代中后期以来处于一个偏热期,苏州等城市近几年高温次数明显增加,而西南区域南京等城市夏季的最高气温则有下降趋势;同时,运用小波分析方法对该省高温时空分布的周期性进行了分析,结果表明,江苏省年平均最高温度变化中5～6a的周期振荡在各地区中反映得比较明显。

Temporal and spatial feature analyses of summer high temperature and heat wave in Jiangsu Province in past 50 years

According to the data of daily top temperature from July to September 1955-2007 in Jiangsu Province,this paper established the time series of high-temperature days and high-temperature strength at various sites using indices of the number of days with temperature of thirty-five degree centigrade and above,high temperature process that lasted three and five days,and mean top temperature.The analysis showed that,Jiangsu Province is partial hot since the late 1990s,when the high-temperature days had increased significantly in cities of Suzhou et.al.in recent years,while in southwest areas of Jiangsu,such as the city of Nanjing,the highest temperature in summer has a trend of descending.This study also analyzed the periodicity of the high-temperature’s spatial and temporal distribution of the province using wavelet analysis.The research showed that,five-to-six year’s periodic oscillation of the annual mean highest temperature is apparent in Jiangsu Province.