globalchange  > 气候变化与战略
DOI: 10.1073/pnas.2000134117
论文题名:
Airborne bacteria confirm the pristine nature of the Southern Ocean boundary layer
作者: Uetake J.; Hill T.C.J.; Moore K.A.; DeMott P.J.; Protat A.; Kreidenweis S.M.
刊名: Proceedings of the National Academy of Sciences of the United States of America
ISSN: 0027-8424
出版年: 2020
卷: 117, 期:24
起始页码: 13275
结束页码: 13282
语种: 英语
英文关键词: Bioaerosol ; Marine aerosol ; Southern ocean
Scopus关键词: aerosol ; airborne bacterium ; Antarctica ; article ; boundary layer ; latitude ; microbial community ; nonhuman ; Northern Hemisphere ; nutrient ; protein fingerprinting ; sea ; Southern Ocean ; summer ; taxonomy ; aerosol ; bacterium ; classification ; genetics ; geography ; isolation and purification ; microbiology ; microflora ; sea ; temperature ; sea water ; Aerosols ; Air Microbiology ; Antarctic Regions ; Bacteria ; Geography ; Microbiota ; Oceans and Seas ; Seawater ; Temperature
英文摘要: Microorganisms are ubiquitous and highly diverse in the atmosphere. Despite the potential impacts of airborne bacteria found in the lower atmosphere over the Southern Ocean (SO) on the ecology of Antarctica and on marine cloud phase, no previous region-wide assessment of bioaerosols over the SO has been reported. We conducted bacterial profiling of boundary layer shipboard aerosol samples obtained during an Austral summer research voyage, spanning 42.8 to 66.5°S. Contrary to findings over global subtropical regions and the Northern Hemisphere, where transport of microorganisms from continents often controls airborne communities, the great majority of the bacteria detected in our sampleswere marine, based on taxonomy, back trajectories, and source tracking analysis. Further, the beta diversity of airborne bacterial communities varied with latitude and temperature, but not with other meteorological variables. Limited meridional airborne transport restricts southward community dispersal, isolating Antarctica and inhibiting microorganism and nutrient deposition from lower latitudes to these same regions. A consequence and implication for this region's marine boundary layer and the clouds that overtop it is that it is truly pristine, free from continental and anthropogenic influences, with the ocean as the dominant source controlling low-level concentrations of cloud condensation nuclei and ice nucleating particles. © 2020 National Academy of Sciences. 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/164169
Appears in Collections:气候变化与战略

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作者单位: Uetake, J., Department of Atmospheric Sciences, Colorado State University, Fort Collins, CO 80523-1371, United States; Hill, T.C.J., Department of Atmospheric Sciences, Colorado State University, Fort Collins, CO 80523-1371, United States; Moore, K.A., Department of Atmospheric Sciences, Colorado State University, Fort Collins, CO 80523-1371, United States; DeMott, P.J., Department of Atmospheric Sciences, Colorado State University, Fort Collins, CO 80523-1371, United States; Protat, A., Research and Development, Australian Bureau of Meteorology, Melbourne, VIC 3008, Australia; Kreidenweis, S.M., Research and Development, Australian Bureau of Meteorology, Melbourne, VIC 3008, Australia

Recommended Citation:
Uetake J.,Hill T.C.J.,Moore K.A.,et al. Airborne bacteria confirm the pristine nature of the Southern Ocean boundary layer[J]. Proceedings of the National Academy of Sciences of the United States of America,2020-01-01,117(24)
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