期刊
GEOPHYSICAL RESEARCH LETTERS
卷 44, 期 13, 页码 6940-6950出版社
AMER GEOPHYSICAL UNION
DOI: 10.1002/2017GL074084
关键词
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资金
- National Natural Science Foundation of China [41671035, 41371068]
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDA05090204]
- U.S. Department of Energy Office of Science Biological and Environmental Research (BER) as part of the Regional and Global Climate Modeling program
- DOE [DE-AC05-76RL01830]
The urban agglomeration of Yangtze River Delta (YRD) is emblematic of China's rapid urbanization during the past decades. Based on homogenized daily maximum and minimum temperature data, the contributions of urbanization to trends of summer extreme temperature indices (ETIs) in YRD are evaluated. Dynamically classifying the observational stations into urban and rural, this study presents unexplored changes in temperature extremes during the past four decades in YRD and quantifies the amplification of the positive trends in ETIs by the urban heat island effect. Overall, urbanization contributes to more than one third of the increase of intensity of extreme heat events in the region, which is comparable to the contribution of greenhouse gases. Compared to rural stations, more notable shifts to the right in the probability distribution of temperature and ETIs are found in urban stations. The rapid urbanization in YRD has resulted in large increases in the risk of heat extremes.
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