气候变化领域集成服务门户(CCPortal): Peroxyacetyl nitrate (PAN) in the border of Beijing, Tianjin and Hebei of China: Concentration, source apportionment and photochemical pollution assessment

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DOI	10.1016/j.atmosres.2020.105106
	Peroxyacetyl nitrate (PAN) in the border of Beijing, Tianjin and Hebei of China: Concentration, source apportionment and photochemical pollution assessment
	Wei W.; Zang J.; Wang X.; Cheng S.
发表日期	2020
ISSN	0169-8095
卷号	246
英文摘要	A one-year observation of atmospheric peroxyacetyl nitrate (PAN) in the border of Beijing-Tianjin-Hebei (BTH) was conducted during 2018–2019 to assess the photochemical pollution in this region. PAN daily average was 2.23, 3.72, 5.34 and 2.44 ppb(v) in October, January, April and July. The higher PAN here compared to previous studies on urban Beijing implies the deterioration of photochemical pollution in BTH region. High positive correlation between PAN and CO in October and January points to the important role of tropospheric accumulation in PAN level in fall and winter; while ΔO3/ΔPAN analysis implies that the photochemical pollution was more aged in this border than in urban Beijing, and more aged in October than in April. Based on the calculations of PAN photochemical formation and thermal decomposition, PAN yield rate was determined, 0.20, 0.07, 0.47 and 0.08 ppt·s−1 for daily average, 0.87, 0.32, 0.95 and 0.93 ppt·s−1 for daily maximum, respectively in October, January, April, and July. Local photochemical pollutions still existed in the border of BTH in non-winter seasons. Potential source contribution function analysis (PSCF) found that the grids that most potentially contribute to high PAN appeared around the border site in July, 50–100 km away in direction of southwest in January, both around this site and along the southern trajectory clusters in October and April. Transport of PAN from South Hebei and Tianjin to Beijing could be seen in non-summer seasons. Regression analyses further quantified the contribution of regional transport to PAN in the border, roughly 65% (April and October), 93% (January) and 48% (July) at noon time. Finally, the comparison in PAN during 12:00–16:00 under various winds explores the more severe photochemical pollutions in South Hebei and Tianjin compared to Beijing in non-summer seasons, but the same level of photochemical pollutions in various cities of BTH in summer. © 2020 Elsevier B.V.
关键词	Decomposition Deterioration Nitrates Peroxides Photochemical forming Regression analysis Peroxyacetyl nitrates Photochemical pollution Positive correlations Potential source contribution function Regional transport Source apportionment Summer season Winter seasons Air pollution atmospheric pollution concentration (composition)nitrate photochemistry source apportionment troposphere urban pollution Beijing [China]China Hebei Tianjin
语种	英语
来源机构	Atmospheric Research
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/132353
推荐引用方式 GB/T 7714	Wei W.,Zang J.,Wang X.,et al. Peroxyacetyl nitrate (PAN) in the border of Beijing, Tianjin and Hebei of China: Concentration, source apportionment and photochemical pollution assessment[J]. Atmospheric Research,2020,246.
APA	Wei W.,Zang J.,Wang X.,&Cheng S..(2020).Peroxyacetyl nitrate (PAN) in the border of Beijing, Tianjin and Hebei of China: Concentration, source apportionment and photochemical pollution assessment.,246.
MLA	Wei W.,et al."Peroxyacetyl nitrate (PAN) in the border of Beijing, Tianjin and Hebei of China: Concentration, source apportionment and photochemical pollution assessment".246(2020).