Division of Environment and Sustainability, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China.
Division of Environment and Sustainability, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China; Division of Mathematics, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China.
Sci Total Environ. 2019 Mar 25;658:744-752. doi: 10.1016/j.scitotenv.2018.12.205. Epub 2018 Dec 15.
In this study, the concept of air parcel residence time was raised and the APRT was investigated to study its potential application in air pollution prevention and control in the Pearl River Delta (PRD) region. The APRT in the PRD region was defined as the total period for which an air parcel stays within the PRD region. The Hybrid Single-Particle Lagrangian Integrated Trajectory (HYSPLIT) model was used to calculate the hourly APRT in 2012, 2014, and 2015 based on forward trajectories from 16,720 starting locations. The seasonal APRT results revealed that long APRT was mainly distributed in southern PRD in the summer half year, but in northeastern PRD in the winter half year. This is related to the prevailing wind directions in the summer and winter monsoons. Moreover, the comparison of APRT in different years revealed that the dispersion condition was relatively poor in fall in 2012 and throughout 2014 but was relatively favorable in 2015, which also corresponded to the pollutant concentrations. The APRT calculated from regional air pollution days indicated that the emission reduction strategy should be implemented in the key areas, namely the eastern and central Guangzhou, western Huizou, and the border between Foshan and Jiangmen, and the construction of new factories should not be allowed in these areas. Compared to the APRT, which was investigated to trace the air pollution source, population exposure to air parcels (PEAP) was investigated to orient the influence of path-and-time-weighted sources to population. Consequently, a high PEAP was found to be distributed mainly in the central Guangzhou and Shenzhen and scattered in other urban areas.
在本研究中，提出了空气包裹体停留时间的概念，并研究了 APRT，以研究其在珠江三角洲（PRD）地区空气污染防治中的潜在应用。PRD 地区的 APRT 定义为空气包裹体在 PRD 地区停留的总时间。使用混合单粒子拉格朗日综合轨迹（HYSPLIT）模型，根据从 16720 个起始位置出发的轨迹，计算了 2012 年、2014 年和 2015 年的每小时 APRT。季节 APRT 结果表明，长 APRT 主要分布在夏季半年的 PRD 南部，但在冬季半年则分布在 PRD 东北部。这与夏季和冬季季风的盛行风向有关。此外，不同年份 APRT 的比较表明，2012 年秋季和 2014 年全年的扩散条件较差，但 2015 年相对较好，这也与污染物浓度相对应。从区域空气污染日计算的 APRT 表明，应在关键地区实施减排战略，即广州东部和中部、惠州西部以及佛山和江门边界，并禁止在这些地区新建工厂。与调查空气污染源的 APRT 相比，研究了人口对空气包裹体的暴露（PEAP），以确定路径和时间加权源对人口的影响。结果发现，高 PEAP 主要分布在广州中部和深圳以及其他城市地区。
