Source-receptor relationships for PM2.5 during typical pollution episodes in the Pearl River Delta city cluster, China.
Source-receptor relationships for PM2.5 during typical pollution episodes in the Pearl River Delta city cluster, China.
复制标题
DOI：
10.1016/j.scitotenv.2017.03.255
复制
发表时间：
2017-10
期刊：
影响因子：
--
通讯作者：
Yiming Liu;Yingying Hong;Q. Fan;Xuemei Wang;P. Chan;Xiaoyang Chen;Anqi Lai;Mingjie Wang
中科院分区：
文献类型：
--
作者：
Yiming Liu;Yingying Hong;Q. Fan;Xuemei Wang;P. Chan;Xiaoyang Chen;Anqi Lai;Mingjie Wang
珠江三角洲位于华南季风区，污染日数可分为“西部型”、“中部型”和“东部型”，相对比例分别为67%、24%和9%。利用这一分类系统，选择了三个典型的污染事件，使用WRF-Chem模式进行数值模拟。采用PM2. 5及其前体物人为排放源敏感性分析方法，对珠三角9个城市PM2. 5的源-受体关系进行了研究。在“西风型”的情况下，珠江三角洲地区受一个偏东的高压系统控制。珠三角西部地区的PM2. 5浓度高于东部地区，珠三角东部地区城市的排放贡献较大。在珠三角城市群内，惠州、东莞和深圳的PM2.5主要来自本地排放，而其他城市的PM2.5则主要来自对外交通。在“东方型”的情况下，珠江三角洲受台风苏力影响，盛行西风。珠三角西部地区城市的排放对PM2.5浓度的影响最大。江门和佛山的PM2.5主要来自本地排放。至于“中央型”的情况，珠江三角洲地区是在一个低风速的均匀气压场控制下。各城市PM2.5浓度主要由本地排放造成。总体而言，风对珠三角地区PM2. 5的输送和空间分布起着重要作用。理想情况下，地方政府建立联防联控措施，减少区域大气污染，尤其是“西部型”污染，是明智之举。
Located in the Southern China monsoon region, pollution days in Pearl River Delta (PRD) were classified into “Western type”, “Central type” or “Eastern type”, with a relative percentage of 67%, 24% and 9%, respectively. Using this classification system, three typical pollution events were selected for numerical simulations using the WRF-Chem model. The source sensitivity method for anthropogenic emissions of PM2.5and its precursors was applied to identify the source-receptor relationships for PM2.5among 9 cities in PRD. For “Western type” case, the PRD region was under control of a high-pressure system with easterly prevailing winds. The PM2.5concentrations in the western PRD region were higher than those in the eastern region, with emissions from cities in the eastern PRD region having higher contributions. Within the PRD's urban cluster, PM2.5in Huizhou, Dongguan and Shenzhen was mainly derived from local emissions, whereas the PM2.5in the other cities was primarily derived from external transport. For “Eastern type” case, the PRD was influenced by Typhoon Soulik with westerly prevailing winds. Emissions from cities in the western PRD region had the highest impacts on the overall PM2.5concentration. PM2.5in Jiangmen and Foshan was primarily derived from local emissions. Regarding “Central type” case, the PRD region was under control of a uniform pressure field with low wind speed. PM2.5concentrations of each city were primarily caused by local emissions. Overall, wind flows played a significant role in the transport and spatial distribution of PM2.5across the PRD region. Ideally, local governments would be wise to establish joint prevention and control measures to reduce regional atmospheric pollution, especially for “Western type” pollution.