長江三角洲城市群對夏季日降水特征

doi:10.3969/2012jms.00**

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長江三角洲城市群對夏季日降水特征
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                        10.3969/2012jms.00**
                    
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中圖分類號:P461.8
基金項(xiàng)目:國家重點(diǎn)基礎(chǔ)研究發(fā)展計(jì)劃（973計(jì)劃）項(xiàng)目（2010CB428504）

Simulation study of urbanization effects on summer daily precipitation over the Yangtze River Delta

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利用耦合了單層城市冠層模型UCM的中尺度模式WRF，探討了長江三角洲地區(qū)城市化對夏季日降水特征的影響。結(jié)果表明，WRF模式能較好地再現(xiàn)長三角地區(qū)2003—2007年夏季降水的空間分布, 比較成功地模擬出了降水中心的位置及強(qiáng)度。城市化使得長三角地區(qū)夏季降水日數(shù)減少了1～5 d，這種降水日數(shù)的減少主要是由于城市化使小雨日數(shù)減少引起。城市化增強(qiáng)了長三角大部分地區(qū)的日降水強(qiáng)度。進(jìn)一步對長三角地區(qū)4個(gè)典型城市群寧鎮(zhèn)揚(yáng)、蘇錫常、上海和杭州灣城市群進(jìn)行了夏季降水日變化分析，得出城市化對降水日變化的影響存在一定的區(qū)域差異。對于長三角整個(gè)大城市群，城市化對降水量、降水強(qiáng)度日峰值出現(xiàn)時(shí)刻以及降水強(qiáng)度日峰值大小無明顯影響，而使得降水量日峰值減少。城市化使得蘇錫常地區(qū)降水量日峰值略有增加，寧鎮(zhèn)揚(yáng)和上海地區(qū)降水量日峰值都減小，而杭州灣城市群區(qū)降水量日峰值出現(xiàn)時(shí)刻延后。城市化使得4個(gè)典型城市群降水強(qiáng)度日變化曲線形態(tài)發(fā)生改變，使得上海地區(qū)降水強(qiáng)度日峰值出現(xiàn)時(shí)刻延后，使得杭州灣城市群區(qū)夜雨增強(qiáng)。

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In this paper，the Weather Research and Forecasting（WRF）model coupled with a single-layer urban canopy model（UCM）is used to investigate the urbanization effects on summer daily precipitation over the Yangtze River Delta area. The results show that the WRF model can quite well reproduce the summer precipitation over the Yangtze River Delta area. The simulated spatial distribution and the intensity of the summer precipitation over a period of 5 years (2003—2007)agree well with the observation. Urbanization results in significant decrease in the rainfall days over the Yangtze River Delta area by 1-5 days. It is mainly caused by the reduction of the minor rainfall days. The daily rainfall intensity is increased over most part of Yangtze River Delta area. The analysis of the rainfall diurnal cycle of the four typical urban subgroups in Yangtze River Delta area shows that there exist some regional differences for the urbanization effects. For the whole Yangtze River Delta city group, urbanization has no significant effects on the occurrence times of the rainfall amount and rainfall intensity daily peak, but results in a decrease of daily peak of the rainfall amount. Urbanization results in a slight increase of daily peak of the rainfall amount over SXC area, but a decrease over NZY and SH area. The occurrence time of the rainfall amount daily peak is delayed over HZW area. Urbanization also changes the shapes of the rainfall intensity diurnal variation over the four typical city subgroups. It causes a delay of the occurrence time of the rainfall intensity daily peak in SH, an increase in the nocturnal rainfall intensity in HZW.

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敖翔宇,任雪娟,湯劍平,楊修群.長江三角洲城市群對夏季日降水特征.氣象科學(xué),2011,(4):451-459 AO Xiangyu ,REN Xuejuan, TANG Jianping, YANG Xiuqun. Simulation study of urbanization effects on summer daily precipitation over the Yangtze River Delta. Journal of the Meteorological Sciences,2011,(4):451-459

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收稿日期:2011-05-19
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抽查舔水白紧大视频,冲喜娘子超甜哒激情五月,亚洲黄色图片偷拍网站,亚洲三级黄片免费播放,91在线观看喷潮红桃,日韩精品在线观看一区二区,久久久久久久久久久久黄色片子,日产精品99久久久久久久久,欧洲亚洲另类图片小说