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The Effects of the Trans-Regional Transport of PM2.5 on a Heavy Haze Event in the Pearl River Delta in January 2015

1
College of Oceanic and Atmospheric Sciences, Ocean University of China, Qingdao 266100, China
2
State Key Laboratory of Atmospheric Boundary Layer Physics and Atmospheric Chemistry, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China
3
State Key Laboratory of Severe Weather & Key Laboratory of Atmospheric Chemistry of CMA, Chinese Academy of Meteorological Sciences, Beijing 100081, China
4
College of Environment Science and Engineering, Ocean University of China, Qingdao 266100, China
*
Author to whom correspondence should be addressed.
Atmosphere 2019, 10(5), 237; https://doi.org/10.3390/atmos10050237
Received: 22 March 2019 / Revised: 21 April 2019 / Accepted: 29 April 2019 / Published: 1 May 2019
(This article belongs to the Section Air Quality)
PDF [2552 KB, uploaded 1 May 2019]

Abstract

The Pearl River Delta (PRD), a region with the fastest economic development and urbanization in China, sometimes has severe haze pollution caused by fine particulate matter (PM2.5). From October to April of the following year, the PRD is influenced by northerly winds, which can bring pollutants from upwind polluted regions. However, the ways that pollutants are transmitted and the contributions of trans-regional inputs are not yet clear. Observational analysis and numerical simulations are applied to explore the effect of PM2.5 trans-regional transport during a heavy haze event occurring from 14 to 25 January 2015. The results show that northerly winds resulted in an increase in the PM2.5 concentration in the northern PRD one day earlier than in the southern PRD. The main transport path of PM2.5 was located at an altitude of 0.1 to 0.7 km; the maximum total transport intensity below 3 km was 9.7 × 103 μg·m−2·s−1; and the near-surface concentration increased by 13.7 to 34.4 μg/m3 by trans-regional transport, which accounted for 56.5% of the contribution rate on average. Southerly winds could also bring a polluted air mass from the sea to the coast, causing more severe haze in coastal regions blocked by mountains, although the overall effect is reduced pollution.
Keywords: Pearl River Delta (PRD); haze; WRF-Chem; trans-regional transport Pearl River Delta (PRD); haze; WRF-Chem; trans-regional transport
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).

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Chen, Q.; Sheng, L.; Gao, Y.; Miao, Y.; Hai, S.; Gao, S.; Gao, Y. The Effects of the Trans-Regional Transport of PM2.5 on a Heavy Haze Event in the Pearl River Delta in January 2015. Atmosphere 2019, 10, 237.

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