Urbanization Impacts on the Summer Heavy Rainfall Climatology over the Eastern United States

Earth Interactions

DevNiyogi¹ 

关键词: Atmosphere–land interaction;    Climate change;    Hydrometeorology;    Mesoscale processes;    Regional effects;    Climate variability;   

DOI  :  10.1175/EI-D-15-0045.1

学科分类：地球科学(综合)

来源: American Geophysical Union

【 摘 要 】

AbstractThe relationship between rainfall characteristics and urbanization over the eastern United States was examined by analyzing four datasets: daily rainfall in 4593 surface stations over the last 50 years (1958–2008), a high-resolution gridded rainfall product, reanalysis wind data, and a proxy for urban land use (gridded human population data). Results indicate that summer monthly rainfall amounts show an increasing trend in urbanized regions. The frequency of heavy rainfall events has a potential positive bias toward urbanized regions. Most notably, consistent with case studies for individual cities, the climatology of rainfall amounts downwind of urban–rural boundaries shows a significant increasing trend. Analysis of heavy (90th percentile) and extreme (99.5th percentile) rainfall events indicated decreasing trends of heavy rainfall events and a possible increasing trend for extreme rainfall event frequency over urban areas. Results indicate that the urbanization impact was more pronounced in the...

【 授权许可】

Unknown