【摘要】 分析了珠三角地区盛夏高温的特征及其主要影响因子,发现(1)珠三角的高温主要集中在盛夏,7月的高温日数最多,8月居第二;(2)珠三角盛夏高温日数有增加的趋势,并存在明显的年际和年代际变化,变化振幅大,从50年代开始到80年代末为相对偏少期,90年代以后有明显持续升高的趋势;(3)珠三角盛夏高温日数与降水之间呈负相关;(4)西太平洋副热带高压偏南偏西时,珠三角地区易出现异常高温天气;(5)当热带气旋逼近珠三角时,珠三角易出现高温;(6)近些年珠三角盛夏平均气温和极端最高气温的明显升高与城市热岛效应有一定的关系。更多还原

【Abstract】 By analyzing the characteristics of the summer high temperature and its impact factors in Pearl River Delta,the results show that(1)the high temperature days mainly concentrated in summer,most in July,August followed.(2)High temperature days is on the increase,with significant inter-annual and decadal variations.of which the variation amplitude is relatively less than normal from 1950s to 1980s,and the trend continues to rise significantly after 1990s.(3)High temperature days have a negative correlation with rainfall.(4)When the position of Western Pacific subtropical high is south west than usual or a tropical cyclone is approaching Pearl River Delta,the unusual high temperatures are prone to occur.(5)In recent years,there is a certain relationship between urban heat island effect and significantly increase of the average summer temperature and extreme maximum temperature.更多还原