DOI: 10.1002/2016JD026194
论文题名: Year-round optical properties and source characterization of Arctic organic carbon aerosols on the North Slope Alaska
作者: Barrett T.E. ; Sheesley R.J.
刊名: Journal of Geophysical Research: Atmospheres
ISSN: 2169897X
出版年: 2017
语种: 英语
英文关键词: Arctic
; Barrow
; Biogenic
; Fossil
; MAE
; Secondary organic aerosol
英文摘要: Long-term data on organic aerosol concentration and optical properties are needed in the Arctic to improve characterization of radiative forcing by atmospheric aerosols. This study presents the seasonal trends (summer 2012 to summer 2013) of organic carbon (OC) and water-soluble organic carbon (WSOC) along with optical properties of light-absorbing OC from a yearlong sampling campaign in Utqiag˙vik, AK. Ambient OC concentrations for the year range from 0.008 ± 0.002 μg m-3 to 0.95 ± 0.06 μg m-3 with peaks in late summer, early fall, and late winter. On average, WSOC accounted for 57 ± 11% of the total OC burden throughout the sampling campaign, which is consistent with previous WSOC values. In order to understand the potential radiative impacts of light-absorbing OC, the light absorption properties of WSOC were determined. Seasonal averaging revealed that the highest average mass absorption efficiency value of 1.54 ± 0.75 m2 g-1 was in the fall, with an annual range of 0.70 ± 0.44 to 1.54 ± 0.75 m2 g-1. To quantify the contributions of fossil and contemporary carbon sources to OC, radiocarbon abundance measurements were performed. For OC, fossil contributions were the greatest for select samples in the fall at 61.4 ± 9.8%, with contemporary contributions dominating OC in the spring and summer (68.9 ± 9.8% and 64.8 ± 9.8%, respectively). Back trajectories identified five major source regions to Utqiag˙vik throughout the year, with a marine influence from the Arctic Ocean potentially present in all seasons. All these results point to impact from primary and secondary sources of OC in the Arctic. ©2017. American Geophysical Union. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/62772
Appears in Collections: 影响、适应和脆弱性 气候减缓与适应
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作者单位: The Institute of Ecological, Earth, and Environmental Sciences Baylor University Waco, Texas USA; Department of Environmental Science Baylor University Waco, Texas USA
Recommended Citation:
Barrett T.E.,Sheesley R.J.. Year-round optical properties and source characterization of Arctic organic carbon aerosols on the North Slope Alaska[J]. Journal of Geophysical Research: Atmospheres,2017-01-01