气候变化领域集成服务门户(CCPortal): Molecular characterization of organic aerosol in the Himalayas: insight from ultra-high-resolution mass spectrometry

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DOI	10.5194/acp-19-1115-2019
	Molecular characterization of organic aerosol in the Himalayas: insight from ultra-high-resolution mass spectrometry
	An, Yanqing; Xu, Jianzhong; Feng, Lin; Zhang, Xinghua; Liu, Yanmei; Kang, Shichang; Jiang, Bin; Liao, Yuhong
发表日期	2019
ISSN	1680-7316
EISSN	1680-7324
卷号	19 期号:2
英文摘要	An increased trend in aerosol concentration has been observed in the Himalayas in recent years, but the understanding of the chemical composition and sources of aerosol remains poorly understood. In this study, molecular chemical composition of water-soluble organic matter (WSOM) from two filter samples collected during two high aerosol loading periods (denoted as P1 and P2) at a high-altitude station (Qomolangma Station, QOMS; 4276 m a.s.l.) in the northern Himalayas was identified using electrospray ionization Fourier transform ion cyclotron resonance mass spectrometry (ESI-FTICR MS). More than 4000 molecular formulas were identified in each filter sample which were classified into two compound groups (CHO and CHON) based on their elemental composition, with both accounting for nearly equal contributions in number (45 %-55 %). The relative abundance weighted mole ratio of O/C-w for P1 and P2 was 0.43 and 0.39, respectively, and the weighted double bond equivalents (DBEw), an index for the saturation of organic molecules, were 7.12 and 7.87, respectively. Although the O/C-w mole ratio was comparable for CHO and CHON compounds, the DBEw was significantly higher in CHON compounds than CHO compounds. More than 50% molecular formulas in the Van Krevelen (VK) diagram (H/C vs. O/C) were located in 1-1.5 (H/C) and 0.2-0.6 (O/C) regions, suggesting potential lignin-like compounds. The distributions of CHO and CHON compounds in the VK diagram, DBE vs. number of C atoms, and other diagnostic diagrams showed high similarities among each other, suggesting their similar source and/or atmospheric processes. Many formulas formed from biogenic volatile organic compounds (e.g., ozonolysis of alpha-pinene products) and biomass-burning-emitted compounds (e.g., phenolic compounds) were found in the WSOM, suggesting the important contribution of these two sources in the Himalayas. The high DBE and high fraction of nitrogen-containing aerosol can potentially impact aerosol light absorption in this remote region. Further comprehensive study is needed due to the complexity of organic aerosol and limited molecular number identified in this study.
学科领域	Environmental Sciences & Ecology; Meteorology & Atmospheric Sciences
语种	英语
WOS研究方向	Environmental Sciences ; Meteorology & Atmospheric Sciences
来源期刊	ATMOSPHERIC CHEMISTRY AND PHYSICS
来源机构	中国科学院西北生态环境资源研究院
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/112045
作者单位	Chinese Acad Sci, State Key Lab Cryospher Sci, Northwest Inst Ecoenvironm & Resources, Lanzhou 730000, Gansu, Peoples R China
推荐引用方式 GB/T 7714	An, Yanqing,Xu, Jianzhong,Feng, Lin,et al. Molecular characterization of organic aerosol in the Himalayas: insight from ultra-high-resolution mass spectrometry[J]. 中国科学院西北生态环境资源研究院,2019,19(2).
APA	An, Yanqing.,Xu, Jianzhong.,Feng, Lin.,Zhang, Xinghua.,Liu, Yanmei.,...&Liao, Yuhong.(2019).Molecular characterization of organic aerosol in the Himalayas: insight from ultra-high-resolution mass spectrometry.ATMOSPHERIC CHEMISTRY AND PHYSICS,19(2).
MLA	An, Yanqing,et al."Molecular characterization of organic aerosol in the Himalayas: insight from ultra-high-resolution mass spectrometry".ATMOSPHERIC CHEMISTRY AND PHYSICS 19.2(2019).