Stabilization for the secondary species contribution to PM2.5 in the Pearl River Delta (PRD) over the past decade, China: A meta-analysis,
Stabilization for the secondary species contribution to PM2.5 in the Pearl River Delta (PRD) over the past decade, China: A meta-analysis,
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过去十年中国珠江三角洲（PRD）次要物种对 PM2.5 贡献的稳定性：一项荟萃分析
DOI：
10.1016/j.atmosenv.2020.117817
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发表时间：
2020
影响因子：
5
通讯作者：
Wang Xuemei
中科院分区：
文献类型：
--
作者：
Yan Fenghua;Chen Weihua;Jia Shiguo;Zhong Buqing;Yang Liming;Mao Jingying;Chang Ming;Shao Min;Yuan Bin;Situ Shuping;Wang Xinming;Chen Duohong;Wang Xuemei
细颗粒物（PM2.5）污染是中国人口稠密地区的大气环境问题之一。 PM2.5中次要物种的贡献已被广泛研究，但对珠江三角洲（PRD）次要物种的长期趋势和这一趋势的主要驱动因素的综合分析尚未探讨。因此，本研究旨在评估2000年至2019年20年间珠三角地区PM2.5的长期时间变化及其次生物种贡献。荟萃分析结果显示，2004年至2019年珠三角地区PM2.5年平均浓度为60.3±16.8μg/m3，总体每年下降3.9μg/m3。 2000-2019年观察到次要物种百分比：2000-2005年首先下降，然后在2005-2008年上升，随后在2008-2019年保持稳定。次生物种比例稳定在80%左右，其中次生有机气溶胶（SOA）和次生无机气溶胶（SIA，包括SO42−、NO3−和NH4+）在过去十年对PM2.5的贡献相同。 SOA 受到总氧化剂 (OX) 和挥发性有机化合物 (VOC) 排放浓度的影响。 SO42− 和 SO2 有所下降，SO2 排放量显着减少。 NO3−和NH4+分别与大气中NO2和NH3浓度呈正相关和负相关。除了目前的SO2和NOx控制外，珠三角还需要进一步采取措施，在更大范围内控制NH3和VOCs排放，以有效改善空气质量。
The fine particulate matter (PM2.5) pollution is one of the atmospheric environmental problems in densely populated areas of China. The secondary species contribution in PM2.5is extensively studied but the comprehensive analysis on the long-term trend of the secondary species and the main drivers of this trend in the Pearl River Delta (PRD) have not been explored. Therefore, this study aimed to evaluate the long-term temporal variation of PM2.5and its secondary species contribution in PRD for twenty years from 2000 to 2019. The results of the meta-analysis showed that the annual average concentration of PM2.5in the PRD was 60.3 ± 16.8 μg/m3and generally decreased by 3.9 μg/m3per year from 2004 to 2019. Three significant transitions in secondary species percentage were observed during 2000–2019: first declined in 2000–2005 before rose in 2005–2008 and followed by a stable period in 2008–2019. The percentage of secondary species stabilized at around 80%, of which secondary organic aerosol (SOA) and secondary inorganic aerosol (SIA, including SO42−, NO3−, and NH4+) had identical contributions to PM2.5over the past decade. SOA was affected by the concentration of total oxidant (OX) and volatile organic compounds (VOCs) emissions. SO42−and SO2have declined with significant reductions in SO2emissions. NO3−and NH4+were positively and negatively correlated with the atmospheric concentration of NO2and NH3, respectively. In addition to the current efforts on SO2and NOxcontrols, further measures are needed to control NH3and VOCs emissions over a larger area for PRD to effectively improve the air quality.