珠三角城市群热岛效应时空分布特征

The Temporal and Spatial Distribution of Heat Island Effect in the Pearl River Delta Urban Group

利用珠江三角洲地区城市群24个气象站近30年气温资料和NCEP格点气温资料,分析珠江三角洲的温度变化趋势及城镇化发展对温度场的影响程度。结果表明,珠三角地区温度上升趋势明显,20世纪90年代后期珠三角城市群热岛效应全面形成。珠三角都市群热岛强度呈明显的季节变化,冬季热岛强度最强,夏季最弱;空间上,珠三角热岛效应贡献主要来自中部城市群与沿海城市群,与近年来城市快速城镇化发展紧密相关。

Based on the observational daily surface air temperature in the Pearl River Delta town and the NCEP/NCAR reanalysis(Rl)data during 1985 to 2012,the characteristics of the annual and seasonal trend of temperatures and the variation of the annual mean temperature were analyzed.The results showed that during the last 28 years,temperature rose significantly and obvious urban heat island effect has been developed at the Pearl River Delta urban group since 1990s.The urban heat island intensity of the Pearl River Delta urban group has obvious seasonal variability that the strongest occurred in winter,but the weakest in summer.Spatially,the heat island effect was mosdy contributed from the center of city groups and coastal city groups,which closely correlated with rapid urbanization.