气候变化领域集成服务门户(CCPortal): Airborne bacteria confirm the pristine nature of the Southern Ocean boundary layer

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DOI	10.1073/pnas.2000134117
	Airborne bacteria confirm the pristine nature of the Southern Ocean boundary layer
	Uetake J.; Hill T.C.J.; Moore K.A.; DeMott P.J.; Protat A.; Kreidenweis S.M.
发表日期	2020
ISSN	0027-8424
起始页码	13275
结束页码	13282
卷号	117 期号:24
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.
英文关键词	Bioaerosol; Marine aerosol; Southern ocean
语种	英语
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
来源期刊	Proceedings of the National Academy of Sciences of the United States of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/160919
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
推荐引用方式 GB/T 7714	Uetake J.,Hill T.C.J.,Moore K.A.,et al. Airborne bacteria confirm the pristine nature of the Southern Ocean boundary layer[J],2020,117(24).
APA	Uetake J.,Hill T.C.J.,Moore K.A.,DeMott P.J.,Protat A.,&Kreidenweis S.M..(2020).Airborne bacteria confirm the pristine nature of the Southern Ocean boundary layer.Proceedings of the National Academy of Sciences of the United States of America,117(24).
MLA	Uetake J.,et al."Airborne bacteria confirm the pristine nature of the Southern Ocean boundary layer".Proceedings of the National Academy of Sciences of the United States of America 117.24(2020).