Changing Characteristics of Comfort Index of Human Body in Bengbu City in the Past 40 Years under the Background of Climate Change.

Based on the daily meteorological data of Bengbu City during 1981 - 2020, the changing characteristics of three elements needed for the calculation of the comfort index of human body ( CIHB) were discussed, and daily CIHB was classified and discussed. The results show that from 1981 to 2020, annual average temperature tended to increase significantly. Annual average wind speed and relative humidity showed a decreasing trend before 2011 but an increasing trend after 201 I. The duration of the four seasons in Bengbu City mainly rose in spring, reduced in winter, declined first and then increased in summer, and rose first and then decreased in autumn. As CIHB was at grades 1 and 9 ( the most uncomfortable), the three factors had different effects on them. For cold weather, the influence of relative humidity and wind speed on CIHB can not be ignored besides temperature. In hot weather, the influence of temperature was dominant, and the change of annual average temperature could well correspond to the change in the number of very hot days. In the context of climate warming, the number of cold days tended to decline generally, but it was larger in the years with fewer very cold days. Under the background of climate warming, there was no obvious change in the number of days of the overall comfort of human body. The number of hot days was closely related to the duration of summer, and the number of days of grade 8 rose significantly in the years with an increase in the duration of summer. [ABSTRACT FROM AUTHOR]