大气科学Issue(5)：911-925,15.DOI:10.3878/j.issn.1006-9895.1411.14199
城市地表特征对京津冀地区夏季降水的影响研究
Impact of Urban Surface Characteristics on Summer Rainfall in the Beijing-Tianjin-Hebei Area
摘要
Abstract
Utilizing daily precipitation data from 24 meteorological stations and results from the Weather Research and Forecasting (WRF) model / Urban Canopy Model (UCM), the impact of urban surface characteristics on summer rainfall in the Beijing–Tianjin–Hebei area was investigated. Results indicated that precipitation at most sites in this region has reduced during the last 30 years, and those sites whose precipitation has reduced the most are mainly centered in the Beijing–Tianjin–Tangshan metropolis. Urbanization is one of the possible factors affecting the precipitation in the Beijing–Tianjin–Hebei area. Comparison of the model results from the control run and sensitivity run indicated that rainfall and rainfall frequency clearly decreased in the Beijing–Tianjin–Tangshan metropolis due to the urban surface. Meanwhile, an increase in rainfall and rainfall intensity was apparent downwind of the urban agglomeration; precipitation above 50 mm changed significantly due to the urban surface, and the contribution to the total could be more than 60%. The percentage of rainfall above 50 mm declined by 6%–20% in the Beijing–Tianjin–Tangshan metropolis, while it increased by 8% downwind. The diurnal structure of rainfall changed due to urbanization: precipitation in Beijing and Tangshan mainly reduced due to urbanization, and the increase downwind occurred mainly in daytime. The findings of this study suggest that the inhibition or enhancement of deep convection, as influenced by changes in latent heat flux and convective available potential energy due to the urban surface, may explain the changes in precipitation.关键词
京津冀/Weather Research and Forecasting model Urban Canopy Model/城市地表特征/城市化/降水Key words
Beijing-Tianjin-Hebei/Weather Research and Forecasting model/Urban Canopy Model/Urban surface characteristics/Urbanization/Precipitation分类
天文与地球科学引用本文复制引用
张珊,黄刚,王君,刘永,贾根锁,任改莎..城市地表特征对京津冀地区夏季降水的影响研究[J].大气科学,2015,(5):911-925,15.基金项目
国家重点基础研究发展计划（973计划）项目2011CB309704，全球变化研究国家重大科学研究计划项目2012CB955604，国家自然科学基金项目41425019、41275083、91337105，高原大气与环境四川省重点实验室开放课题PAEKL-2014-K2 （）
