西安城市热岛效应对夏季高温的影响

随着全球变暖趋势的加剧及城市化的快速推进,城市夏季高温的危害越来越受到人们的重视。利用西安及其属县蓝田历年温度资料,对西安夏季高温及城市热岛效应对高温灾害的影响作了简要分析。结果表明:西安夏季高温期范围广,日数多,持续时间长,有明显的年、月际变化特征;西安极端高温事件强度有明显增强的特征;西安城市热岛效应有逐渐增强的趋势;西安夏季高温有发生时间提前及高温过程日数延长的特征,其主要原因是在全球变暖大的高温背景下,城市热岛效应的增强;西安城市高温主要受白天热岛效应的影响,且影响主要集中于春末夏初,作用超过10%。

The impact of urban heat island effect on high temperature in summer in Xi'an

With the globle warming development and big city's expend,the high-temperature disaster in summer in city is becoming evident.In this paper,we used the big city xi'an and his small county Lantian's temperature information to analysis the summer's high-temperature characters,with the ways of statistics、analysis and comparison.The results showed that: 1)high temperature in summer of Xi'an had the characters of wide range,more days,long duration and evident difference in years and months;2)the strength of extreme high-temperature events in Xi'an had a evident character of increase;3)the urban heat island of Xi'an had gradually strengthened in the recent 46 years;4)the main reasons of this character that the high temperature events appeared in advance and the process of high temperature extend to more days in Xi'an was that under the background of high temperature the urban heat island effect strengthened;5)the role of urban heat island affecting high temperature in Xi'an was mainly on the day,and was mainly in the late spring and early summer,and the effect of this role is more than 10%.