globalchange  > 气候减缓与适应
DOI: 10.1002/2017JD027696
Scopus记录号: 2-s2.0-85043603285
论文题名:
Near-Surface Refractory Black Carbon Observations in the Atmosphere and Snow in the McMurdo Dry Valleys, Antarctica, and Potential Impacts of Foehn Winds
作者: Khan A.L.; McMeeking G.R.; Schwarz J.P.; Xian P.; Welch K.A.; Berry Lyons W.; McKnight D.M.
刊名: Journal of Geophysical Research: Atmospheres
ISSN: 2169897X
出版年: 2018
卷: 123, 期:5
起始页码: 2877
结束页码: 2887
语种: 英语
英文关键词: aerosols ; Antarctica ; refractory black carbon ; snow
英文摘要: Measurements of light-absorbing particles in the boundary layer of the high southern latitudes are scarce, particularly in the McMurdo Dry Valleys (MDV), Antarctica. During the 2013–2014 austral summer near-surface boundary layer refractory black carbon (rBC) aerosols were measured in air by a single-particle soot photometer (SP2) at multiple locations in the MDV. Near-continuous rBC atmospheric measurements were collected at Lake Hoare Camp (LH) over 2 months and for several hours at more remote locations away from established field camps. We investigated periods dominated by both upvalley and downvalley winds to explore the causes of differences in rBC concentrations and size distributions. Snow samples were also collected in a 1 m pit on a glacier near the camp. The range of concentrations rBC in snow was 0.3–1.2 ± 0.3 μg-rBC/L-H2O, and total organic carbon was 0.3–1.4 ± 0.3 mg/L. The rBC concentrations measured in this snow pit are not sufficient to reduce surface albedo; however, there is potential for accumulation of rBC on snow and ice surfaces at low elevation throughout the MDV, which were not measured as part of this study. At LH, the average background rBC mass aerosol concentrations were 1.3 ng/m3. rBC aerosol mass concentrations were slightly lower, 0.09–1.3 ng/m3, at the most remote sites in the MDV. Concentration spikes as high as 200 ng/m3 were observed at LH, associated with local activities. During a foehn wind event, the average rBC mass concentration increased to 30–50 ng/m3. Here we show that the rBC increase could be due to resuspension of locally produced BC from generators, rocket toilets, and helicopters, which may remain on the soil surface until redistributed during high wind events. Quantification of local production and long-range atmospheric transport of rBC to the MDV is necessary for understanding the impacts of this species on regional climate. ©2018. American Geophysical Union. All Rights Reserved.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/114268
Appears in Collections:气候减缓与适应

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作者单位: Department of Civil and Environmental Engineering and Institute of Arctic and Alpine Research, University of Colorado Boulder, Boulder, CO, United States; National Snow and Ice Data Center, Cooperative Institute for Research in Environmental Sciences, University of Colorado Boulder, Boulder, CO, United States; Handix Scientific, Boulder, CO, United States; National Oceanic and Atmospheric Administration, Boulder, CO, United States; Aerosol and Radiation Section of the Marine Meteorology Division, Naval Research Laboratory, Monterey, CA, United States; Byrd Polar and Climate Research Center, Ohio State University, Columbus, OH, United States

Recommended Citation:
Khan A.L.,McMeeking G.R.,Schwarz J.P.,et al. Near-Surface Refractory Black Carbon Observations in the Atmosphere and Snow in the McMurdo Dry Valleys, Antarctica, and Potential Impacts of Foehn Winds[J]. Journal of Geophysical Research: Atmospheres,2018-01-01,123(5)
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