城市化对长江三角洲区域降水的可能影响  

Possible effects of urbanization on regional precipitation over Yangtze River Delta area

作　　者：林恒[1] 孙鉴泞[1,2] 

机构地区：[1]南京大学大气科学学院,南京210023 [2]江苏省气候变化协同创新中心,南京210023

出　　处：《南京大学学报（自然科学版）》2014年第6期792-799,共8页Journal of Nanjing University（Natural Science）

基　　金：国家重点基础研究发展计划(973计划)(2010CB428501)

摘　　要：本文利用我国中东部地区115个测站1960—2005年的逐日降水资料,分析了城市化对我国长江三角洲地区降水的可能影响.以中东部地区为背景,对比分析了长江三角洲地区与背景区域的年降水变化趋势,结果都呈现增长趋势,长江三角洲地区的年降水量增长速度明显快于背景区域的年降水量增长速度.同时分析了两个区域不同季节和不同强度的降水变化特征,结果表明:春、秋两季降水都减少,春季长江三角洲地区降水减少速度慢,而秋季长江三角洲地区降水减少速度快;整个中东部地区小雨的年降水量减少,中雨、大雨和暴雨的年降水量增加,长江三角洲地区小雨的年降水量略有增加,中雨、大雨和暴雨年降水量的增长速度明显高于整个中东部地区.结合降水天数的变化情况,说明降水强度加大是长江三角洲地区降水增加的主要原因,这可能与该地区的快速城市化进程有关.In this paper,the daily precipitation data of the 115 stations in Middle East China from 1960 to 2005 are used to analyze the possible effects of urbanization on regional precipitation,especially on the Yangtze River Delta area.The annual precipitation increases in the two regions.But the increment in Yangtze River Delta area is obviously faster than in Middle East China.The rainfall variability for different seasons and different densities in the two regions are also analyzed.In spring and autumn,the precipitation decreases in the two regions.Compared to the Middle East China,the precipitation in Yangtze River Delta area decreases slower in spring,but it decreases faster in autumn.The annual precipitation of light rain decreases in Middle East China,while the annual precipitation of moderate rain,large rain,and heavy rain increases in this region.On the other hand,the annual precipitation for each level increases in Yangtze River Delta area,and the increment for moderate rain,large rain,and heavy rain are significantly faster than in Middle East China.Evidences show that the faster increment of rainfall in Yangtze River Delta area is due to the enhancement of rainfall intensity.The reason may be contributed to the fast urbanization in this area.

关 键 词：城市化 降水 长江三角洲 中国中东部地区 

分 类 号：P457.6[天文地球—大气科学及气象学]