惠州城市热岛效应变化特征

基于惠州城市和乡村1962-2008年逐日定时和2005-2008年逐日逐时的气温资料,利用统计分析软件SPSS和突变检验方法Mann-Kendall统计分析了惠州城市热岛效应的变化特征及对城市气温变化的影响。结果表明:(1)惠州城市热岛强度具有明显的季节、月和日变化特征,无明显的周变化特征;上半年城市热岛强度明显低于下半年,四季中秋季最高、春季最低;日间一般为负值而夜间为正值,城市热岛强度最大出现在秋冬季节的夜间,最小出现在冬季的午间。(2)惠州年和四季平均城市热岛强度呈逐年显著上升的趋势,城市热岛效应对城市气温上升具有明显作用,城市热岛效应是城市年平均气温日较差呈下降趋势的一个重要原因。

The Variation Characteristics of Urban Heat Island Effect in Huizhou

Based on the daily temperature data in Huizhou urban and rural from 1962 to 2008, the variation characteristics of the urban heat island (UHI) effect were analyzed. The results show that: (1) the UHI in Huizhou has obvious seasonal, monthly and daily variation characteristics, but no weekly variation characteristics. The UHI intensity in the first half of the year is obviously lower than in the second half of the year, and the highest in autumn and the lowest in spring. The UHI intensity is generally negative in daytime but positive in nighttime. (2) The yearly and seasonal UHI intensity show an significant increasing trend, and the UHI have obvious effects on temperature change, the UHI is an important reason that cause the decreasing of annual mean daily temperature range.