南京城区夏季低层逆温对人体舒适状况影响初探

Influence of Low-Level Inversion on Human Body Discomfort at Nanjing City Proper in Summer

利用 2 0 0 0年夏季南京城区地面气象要素和低层探空资料 ,分析了该年夏季南京城区早、晚低层逆温的频率、厚度和强度变化特征 ,着重从统计角度定量研究了逆温的厚度、强度与城区地面温度、相对湿度变化的关系及对人体舒适状况的影响。结果表明 :低层逆温对城区地面温湿变化及其幅度影响较大 ,当 0 7时有逆温层时 ,0 8时至 1 4时的温度增加幅度变大 ,相对湿度减小幅度也变大 ,人体不适指数增加幅度变大 ;当 1 9时有逆温层时 ,2 0时至 2 3时温度减小幅度变小 ,相对湿度增加幅度也变小 ,人体不适指数减小幅度变小 。

Based on the ground-level meteorological data and low-level sonde data from July to August,2000 in Nanjing,the characteristics of thickness and intensity of low-level inversion (LLINV) are discussed,especially on their relations to urban surface temperature and relative humidity variation as well as their influence on body discomfort status.The result shows that there exists a distinct influence of LLINV on urban surface temperature,relative humidity,and their scope.The early LLINV reinforces the gain in temperature and the abatement in relative humidity from 08:00 to 14:00.On the contrary,the late LLINV cripples the abatement in temperature and the gain in relative humidity from 20:00 to 23:00.In addition,the index of body discomfort will be enhanced when LLINV appears.Finally,the regression equation on the intensity of LLINV and the body discomfort index is established,which provides a new way for quantificational prediction of the body discomfort index in operational weather service.