摘要
本文基于上海市典型城市和乡村站2017年逐时气象观测数据,详细分析和深入阐述了晴朗微风、大风、强降水和极端高温等典型气象条件下城市热岛强度逐时变化特征。通过分析上海市微风和极端高温等气象事件长期变化趋势,讨论了城市热岛效应未来变化趋势。伴随日出日落,年平均和微风晴朗条件下城市热岛强度呈现出快速降低—稳定低值—快速增加—稳定高值周期性昼夜变化特征,其中微风晴朗条件下城市热岛强度日内变化可高达7℃,而大风、强降水和高温等极端事件下城市热岛强度呈现出不一样的逐时变化特征。随着风速降低和气候变暖,过去40 a上海市微风和极端高温天气日数呈现快速增加趋势,其势必会加剧上海市城市热岛强度及其不利影响。
In this paper,the study aims to elaborate the hourly variabilities of UHII in Shanghai under typical weather conditions such as sunny weak wind,strong wind,heavy rainfall and extreme high temperature events based on hourly air temperatures collected at typical urban and rural meteorological observation stations in 2017.Meanwhile,this study further discuss the future trend of UHII in Shanghai combining the long-term trends of the meteorological events of weak and extreme high temperature.From the sunrise to sunset,UHII experienced rapid decrease,stable low value,rapid increase and stable high value exhibiting the periodic diurnal variabilities.The diurnal variation of UHII is as high as 7℃under weak wind and sunny condition.However,different diurnal variations of UHII are observed under strong wind speed and precipitation,and extreme high temperature.With the decrease of wind speed and climate warming,weak wind and extreme high temperature is increasing rapidly in Shanghai in the past 40 years,which will inevitably aggravate UHII and increase the risk for urban populations.
作者
黄群芳
颜敏
HUANG Qunfang;YAN Min(College of Urban,Resources and Environmental Science,Jiangsu Second Normal University,Nanjing 210013,China)
出处
《气象科学》
北大核心
2022年第3期402-409,共8页
Journal of the Meteorological Sciences
基金
国家自然科学基金资助项目(41901198)。
关键词
城市热岛
气象条件
逐时变化
风速
上海
UHI
meteorological condition
hourly variability
wind speed
Shanghai
