HR: 0800h
AN: A21C-0876    [Abstracts]
TI: A Potential Impact on the Chemical Composition in the Marine Boundary Layer in the Arctic Ocean by Ship Emissions
AU: * xie, z
EM: zqxie@umich.edu
AF: Institute of Polar Environment, School of Earth and Space Sciences, University of Science and Technology of China, Jinzhai Road 96, Hefei, AH 230026 China
AU: * xie, z
EM: zqxie@umich.edu
AF: Department of Geological Sciences, The University of Michigan, C.C. Little Building,1100 N. University, Ann Arbor, MI 48109 United States
AU: Wang, X
EM: xmwang@gig.cas.cn
AF: State Key Laboratory of organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Wushan, Guangzhou, GD 510640 China
AU: Blum, J D
EM: jdblum@umich.edu
AF: Department of Geological Sciences, The University of Michigan, C.C. Little Building,1100 N. University, Ann Arbor, MI 48109 United States
AU: Sun, L
EM: slg@ustc.edu.cn
AF: Institute of Polar Environment, School of Earth and Space Sciences, University of Science and Technology of China, Jinzhai Road 96, Hefei, AH 230026 China
AB: Samples of aerosols in the marine boundary layer (MBL) of the Arctic Ocean were collected aboard R/V ­(°)Xuelong­ñ during the summer on the Second Chinese Arctic Research Expedition (July-September, 2003). Chemical compositions including major and trace elements and polycyclic aromatic hydrocarbons (PAHs) in aerosol particles were analyzed. Results showed that significant amounts of S, Fe, V and Ni are emitted from ship diesel engines and contaminate the ambient air. The total amount of Fe, which plays a significant role in the ocean ­(°)biological pump­ñ, emitted from ships in the Arctic is estimated at 4.33­A106 kg yr-1. Sulfur emitted into the atmosphere may be transformed to sulfur acid and result in a chlorine depletion in sea-salt. Because the global inventory of sulfur from ship exhausts is large and halogens may have important consequences in possible tropospheric ozone destruction, the role of ships in effecting halogen depression in sea-salt should be evaluated. For organic compounds, 17 PAHs including Fluoranthene, Phenanthrene, Chrysene, Indeno[123-cd]pyrene, Pyrene, Benzo[b]fluoranthene, Benzo[ghi]pyrene, Naphthalene, Benzo[a]anthracene, Benzo[k]fluoranthene, Coronene, Fluorene, Benzo[a]pyrene, Acenaphthene, Anthracene, Dibenzo[a,h]anthracene and Acenaphthylene were detected. The average levels of subspecies of PAHs in ambient air ranged from 0.003 to 0.089 ng/m3. Among the 17 PAHs, fluoranthene had a relative high level, while the level of acenaphthylene was relative low. The aerosols contaminated by the ship, which were commonly excluded in previous investigations, thus provide an opportunity to investigate and understand the role of ship emissions in the atmospheric chemistry of the marine boundary layer, especially in the Arctic Ocean.
DE: 0345 Pollution: urban and regional (0305, 0478, 4251)
DE: 0365 Troposphere: composition and chemistry
DE: 0368 Troposphere: constituent transport and chemistry
DE: 0432 Contaminant and organic biogeochemistry (0792)
DE: 0478 Pollution: urban, regional and global (0345, 4251)
SC: Atmospheric Sciences [A]
MN: Fall Meeting 2005