研究报告

  • 张丽,李磊,张立杰,谭明艳,钟雪平.深圳市局地PM2.5污染事件的时空特征及典型背景环流分析[J].环境科学学报,2018,38(1):41-51

  • 深圳市局地PM2.5污染事件的时空特征及典型背景环流分析
  • Spatial-temporal characteristics of the local PM2.5 pollution episodes in Shenzhen and analysis on background circulation of typical samples
  • 基金项目:国家重点研发计划项目(No.2016YFC0203600);广东省气象局科研项目(No.2016B37)
  • 作者
  • 单位
  • 张丽
  • 1. 深圳市气象局, 深圳 518040;2. 深圳市国家气候观象台, 深圳 518040
  • 李磊
  • 1. 深圳市气象局, 深圳 518040;2. 深圳市国家气候观象台, 深圳 518040
  • 张立杰
  • 1. 深圳市气象局, 深圳 518040;2. 深圳市国家气候观象台, 深圳 518040
  • 谭明艳
  • 1. 深圳市气象局, 深圳 518040;2. 深圳市国家气候观象台, 深圳 518040
  • 钟雪平
  • 1. 深圳市气象局, 深圳 518040;2. 深圳市国家气候观象台, 深圳 518040
  • 摘要:利用深圳及周边地区22个环保监测站的PM2.5小时数据、深圳市152个高密度(2.5 km×2.5 km)自动气象站及3部边界层风廓线仪的探测数据,分析了深圳市局地PM2.5污染事件的时空变化特征及其背景环流特征.结果表明:深圳市西北角和东北角是局地PM2.5污染最频繁的2个区域,局地污染事件发生次数约占总污染事件次数的40%,每日夜间至次日凌晨是局地污染高发期.各个季节局地PM2.5污染发生的大尺度环流形势不同,春季为变性高压脊配合西南低槽发展型,夏季为热带气旋外围环流影响型,秋季为副高控制下的弱高压脊型,冬季主要为冷锋前、弱高压脊或均压场控制型.局地海-陆、丘陵-平原热力差异造成的局地环流易导致地面弱风和局地辐合的出现,成为诱发局地PM2.5污染的直接原因.
  • Abstract:By using the PM2.5 data from the 22 atmospheric environment monitoring stations in and around Shenzhen along with the meteorological data from 152 auto weather stations and 3 boundary profilers, the spatial-temporal characteristics of the local PM2.5 pollution (LPP) episodes in Shenzhen and the background circulation of some typical samples are analyzed. The analysis shows that:①The numbers of the LPP episodes recorded in the northwest and the northeast areas of Shenzhen are more then those in the other areas, and almost 40% of the PM2.5 pollution cases in these areas can be classified as LPP episodes. Most of the LPP episodes are recorded during the period of from night to the next morning. ②The LPP episodes are caused by different large-scale background circulations in different seasons, which are transformed high pressure ridge in spring, outer circulation of tropical cyclone in summer, weak high pressure ridge controlled by subtropical high pressure area in autumn and cold front, weak high pressure ridge or uniform pressure in winter. ③The thermal differences between the sea and the land, or, between the mountain and the plain are likely to trigger the local convergences and weak wind conditions, which consequently are likely to cause LPP episodes.

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