报告题目：Increased heat risk in wet climate induced by urban humid heat（《Nature》文章）
时间：2023年5月12日（周五）8:30-10:00
报告地点：腾讯会议804-1645-5634
报告人：Keer Zhang
主持人：王伟副教授
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报告人简介：
张可儿，2019年毕业于中山大学获得学士学位，2022年于耶鲁大学获得硕士学位，现为耶鲁大学在读博士生。主要从事城市气候和边界层气象的数值模拟研究，研究成果发表在Nature等期刊。
报告简介：Cities are generally warmer than their adjacent rural land, a phenomenon known as the urban heat island (UHI). Often accompanying the UHI effect is another phenomenon called the urban dry island (UDI), whereby the humidity of urban land is lower than that of the surrounding rural land. The UHI exacerbates heat stress on urban residents, whereas the UDI may instead provide relief because the human body can cope with hot conditions better at lower humidity through perspiration. The relative balance between the UHI and the UDI-as measured by changes in the wet-bulb temperature (Tw)-is a key yet largely unknown determinant of human heat stress in urban climates. We find that Tw is reduced in cities in dry and moderately wet climates, where the UDI more than offsets the UHI, but increased in wet climates (summer precipitation of more than 570 millimetres). Our results arise from analysis of urban and rural weather station data across the world and calculations with an urban climate model. In wet climates, the urban daytime Tw is 0.17 ± 0.14 degrees Celsius (mean ± 1 standard deviation) higher than rural Tw in the summer, primarily because of a weaker dynamic mixing in urban air. This Tw increment is small, but because of the high background Tw in wet climates, it is enough to cause two to six extra dangerous heat-stress days per summer for urban residents under current climate conditions. The risk of extreme humid heat is projected to increase in the future, and these urban effects may further amplify the risk.
2023年5月10日