Status: this preprint has been withdrawn by the authors.
Molecular Characterization of Organosulfates in Arctic Ocean and
Antarctic atmospheric aerosols
Yuqing Ye,Zhouqing Xie,Ming Zhu,and Xinming Wang
Abstract. Organic aerosols are ubiquitous components of atmospheric aerosols. Organosulfate aerosols have been detected in the Arctic Ocean atmosphere and may play an important role in the radiative balance in Polar Regions. Aerosol samples from the Arctic Ocean and Antarctic atmosphere during 2014/2015 CHINARE were analysed by ultrahigh resolution mass spectrometry coupled with negative ion mode electrospray ionization (ESI(-)-UHRMS). Hundreds of organic compounds were detected and tentatively determined by their formulas, including organosulfates (OSs), nitrooxy-organosulfates (NOSs), organonitrates (ONs) and oxygenated hydrocarbons (OxyCs). The number of OSs/NOSs accounted for 28–32 % of the total number of detected molecules at polar sites and ONs were 28–40 %. Organic compounds of Arctic Ocean and Antarctic aerosols had high oxidation states for carbon and a large percentage of high molecular weight formulas; this indicated that aged organic aerosols likely comprise a significant part of the polar atmosphere. We hypothesized that highly oxidized HMW compounds tend to be transported to the polar area from stratospheric reservoirs. Dramatic differences of the molecular characteristics were observed when we compared aerosol samples between polar sites and Guangzhou sites, reflecting the different oxidation mechanisms and atmospheric transmission. The polar sites contained higher fractions of OSs/NOSs and lower fractions of ONs than the Guangzhou sites did; this indicated that the oxidation of NOx was weaker in the polar region. Observing that the fraction and oxidation states of polycyclic aromatic OSs/NOSs polar regions were similar to the Guangzhou urban area but not the rural area implied an anthropogenic influence on OSs/NOSs in remote polar areas. In addition, the contribution of potential precursors (anthropogenic and biogenic volatile organic compounds) to OS and NOS formation as well as the effects of nss-SO4 aerosols, pH and RH on OS formation in polar areas were discussed. Our study presents the first overview of OSs and ONs in the Arctic Ocean and Antarctic atmosphere and promotes the understanding of their characteristics and sources.
This preprint has been withdrawn.
Received: 28 Apr 2019 – Discussion started: 06 May 2019
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Latest update: 07 Nov 2024
Yuqing Ye
Institute of Polar Environment & Anhui Key Laboratory of Polar Environment and Global Change, School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, China
Zhouqing Xie
Institute of Polar Environment & Anhui Key Laboratory of Polar Environment and Global Change, School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, China
Center for Excellence in Urban Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, Fujian 361021, China
Ming Zhu
State Key Laboratory of Organic Geochemistry and Guangdong Key Laboratory of Environmental Protection and Resources Utilization, Guangzhou, 510640, China
State Key Laboratory of Organic Geochemistry and Guangdong Key Laboratory of Environmental Protection and Resources Utilization, Guangzhou, 510640, China
Aerosol samples from the Arctic Ocean and Antarctic atmosphere were analysed by ultrahigh resolution mass spectrometry coupled with negative ion mode electrospray ionization. Hundreds of organic compounds, including organosulfates, nitrooxy-organosulfates, organonitrates and oxygenated hydrocarbons, were detected. Our study presents the first overview of OSs and ONs in the polar regions and promotes the understanding of their characteristics and sources.
Aerosol samples from the Arctic Ocean and Antarctic atmosphere were analysed by ultrahigh...