Insights into characteristics, sources, and evolution of submicron aerosols during harvest seasons in the Yangtze River delta region, China

被引：110

作者：

Zhang, Y. J. ^{[1
,2
]}

Tang, L. L. ^{[1
,2
]}

Wang, Z. ^{[1
]}

Yu, H. X. ^{[3
]}

Sun, Y. L. ^{[4
]}

Liu, D. ^{[5
]}

Qin, W. ^{[2
]}

Canonaco, F. ^{[6
]}

Prevot, A. S. H. ^{[6
]}

Zhang, H. L. ^{[7
]}

Zhou, H. C. ^{[1
]}

机构：

[1] Nanjing Univ Informat Sci & Technol, Sch Environm Sci & Engn, Jiangsu Key Lab Atmospher Environm Monitoring & P, Nanjing 210044, Jiangsu, Peoples R China

[2] Jiangsu Environm Monitoring Ctr, Nanjing 210036, Jiangsu, Peoples R China

[3] Nanjing Univ, Sch Environm, State Key Lab Pollut Control & Resource Reuse, Nanjing 210093, Jiangsu, Peoples R China

[4] Chinese Acad Sci, Inst Atmospher Phys, State Key Lab Atmospher Boundary Layer Phys & Atm, Beijing 100029, Peoples R China

[5] Univ Manchester, Ctr Atmospher Sci, Sch Earth Atmospher & Environm Sci, Manchester M13 9PL, Lancs, England

[6] Paul Scherrer Inst, Lab Atmospher Chem, CH-5232 Villigen, Switzerland

[7] Handix LLC, Boulder, CO USA

来源：

ATMOSPHERIC CHEMISTRY AND PHYSICS | 2015年 / 15卷 / 03期

基金：

中国国家自然科学基金;

关键词：

MASS-SPECTROMETER DATA; RESOLVED CHEMICAL-CHARACTERIZATION; BIOMASS BURNING CONTRIBUTION; OXYGENATED ORGANIC AEROSOLS; URBAN SUPERSITE T0; NEW-YORK-CITY; SOURCE APPORTIONMENT; MEXICO-CITY; QUANTITATIVE-DETERMINATION; MULTILINEAR ENGINE;

D O I：

10.5194/acp-15-1331-2015

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Atmospheric submicron particulate matter (PM1) is one of the most significant pollution components in China. Despite its current popularity in the studies of aerosol chemistry, the characteristics, sources and evolution of atmospheric PM1 species are still poorly understood in China, particularly for the two harvest seasons, namely, the summer wheat harvest and autumn rice harvest. An Aerodyne Aerosol Chemical Speciation Monitor (ACSM) was deployed for online monitoring of PM1 components during summer and autumn harvest seasons in urban Nanjing, in the Yangtze River delta (YRD) region of China. PM1 components were shown to be dominated by organic aerosol (OA, 39 and 41 %) and nitrate (23 and 20 %) during the harvest seasons (the summer and autumn harvest). Positive matrix factorization (PMF) analysis of the ACSM OA mass spectra resolved four OA factors: hydrocarbon-like mixed with cooking-related OA (HOA + COA), fresh biomass-burning OA (BBOA), oxidized biomass-burning-influenced OA (OOA-BB), and highly oxidized OA (OOA); in particular the oxidized BBOA contributes similar to 80% of the total BBOA loadings. Both fresh and oxidized BBOA exhibited apparent diurnal cycles with peak concentration at night, when the high ambient relative humidity and low temperature facilitated the partitioning of semi-volatile organic species into the particle phase. The fresh BBOA concentrations for the harvests are estimated as BBOA = 15.1 x (m/z 60-0.26% x OA), where m/z (mass-to-charge ratio) 60 is a marker for levoglucosan-like species. The (BBOA + OOA-BB)/Delta CO, (Delta CO is the CO minus background CO), decreases as a function of f(44) (fraction of m/z 44 in OA signal), which might indicate that BBOA was oxidized to less volatile OOA, e.g., more aged and low volatility OOA (LV-OOA) during the aging process. Analysis of air mass back trajectories indicates that the high BB pollutant concentrations are linked to the air masses from the western (summer harvest) and southern (autumn harvest) areas.

引用

页码：1331 / 1349

页数：19

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