生态学报2017，Vol.37Issue(3)：953-959,7.DOI:10.5846/stxb201509111878
北京市区车辆热排放及其对小气候的影响
The impact of vehicle emissions on microclimate in Beijing metropolis
摘要
Abstract
The urban heat island effect is worsening with the rapid urbanization of Beijing.Vehicle heat emissions are regarded as one of the most significant factors affecting the urban thermal environment.The intensity and scale of the impact of vehicle heat should not be ignored given the sharp increase in car ownership in recent years.Taking the region inside Beijing 5th ring road as the study area,this paper proposes a feasible method to calculate vehicle heat intensity through the data of transportation index,traffic density,road length,etc.The microclimate data were collected through field sampling at several typical sites.These temperature and humidity data were used to explore the quantitative relationship with vehicle heat intensity in the Beijing metropolis.The results show that vehicle heat intensity distributes in radial pattern in Beijing.The mean heat intensity ranges from 8.6 to 10.8 W/m2 and reaches 32.2-53.9 W/m2 inside the 3th ring road.The average vehicle heat intensity at daytime is 2-10 times the intensity at nighttime.The maximum value of vehicle heat appears in the mornings and evenings.Interestingly,the spatial pattern of vehicle heat has no significant difference between weekends and weekdays.The vehicle heat intensity at 8:00 a.m.shows a significant correlation with its temperature difference on main roads.The temperature amplification reaches 0.91 ℃/10 W/m2 at 8:00 a.m.At some points,we observe a significantly positive correlation between vehicle heat intensity and its temperature difference.We also notice a lag effect (10-20 min)of vehicle heat on temperature amplification.This study could provide useful information for the scientific planning of roads and urban landscapes.关键词
交通指数/交通密度/车辆排热强度/温差Key words
transportation index/traffic density/vehicle heat intensity/temperature difference引用本文复制引用
王业宁,孙然好,陈利顶..北京市区车辆热排放及其对小气候的影响[J].生态学报,2017,37(3):953-959,7.基金项目
国家自然科学基金项目(41471150,41230633) （41471150,41230633）
