globalchange  > 影响、适应和脆弱性
DOI: 10.1002/2016JD025340
论文题名:
Hydroxy fatty acids in snow pit samples from Mount Tateyama in central Japan: Implications for atmospheric transport of microorganisms and plant waxes associated with Asian dust
作者: Tyagi P.; Kawamura K.; Bikkina S.; Mochizuki T.; Aoki K.
刊名: Journal of Geophysical Research: Atmospheres
ISSN: 2169897X
出版年: 2016
卷: 121, 期:22
起始页码: 641
结束页码: 660
语种: 英语
英文关键词: Gram-negative bacteria ; hydroxy fatty acids ; long-range transport ; plant waxes ; snowpack
Scopus关键词: air mass ; atmospheric transport ; concentration (composition) ; dust ; fatty acid ; long range transport ; metabolite ; outflow ; oxidation ; snowpack ; soil microorganism ; source apportionment ; wax ; China ; Taklimakan Desert ; Xinjiang Uygur ; Bacteria (microorganisms) ; Embryophyta ; Negibacteria
英文摘要: We report here the source apportionment of atmospheric soil microorganisms and higher plant metabolites based on chemical markers (hydroxy fatty acids: FAs) in the snowpack samples collected from Mount Tateyama in central Japan during spring 2009 (N = 6) and 2011 (N = 7). A homologous series of β-hydroxy FAs (C9–C20), constituents of Gram-negative bacteria (GNB), in snowpacks clearly suggest a long-range atmospheric transport of dust-associated bacteria followed by scavenging by snowflakes. Similarly, higher atmospheric abundances of α-(C16–C32) and ω-(C9–C30)-hydroxy FAs in the snow layers containing Asian dust revealed contributions from soil microbes and higher plant epicuticular waxes. Moreover, covariation between the concentrations of hydroxy FAs and water-soluble Ca2+ (dust tracer), together with calculated air mass backward trajectories, demonstrated their source regions such as the Taklamakan Desert, Gobi Desert, and Loess Plateau. A close match of molecular distributions of hydroxy FAs (with the predominance of ω- and β-isomers) is noteworthy between snowpack (present study) and springtime aerosols from Chichijima Island in the western North Pacific (WNP). This observation suggests a “below-cloud scavenging” of transported dust particles and associated soil microbes in the East Asian outflow by snowflakes. These distributions are, however, contrary to those observed in the fresh snow samples from Sapporo, northern Japan (predominance of α-hydroxy FAs), which could be explained by “in-cloud” microbial oxidation processes. This comparison, therefore, provides additional insights regarding the aeolian transport of soil microbes in the East Asian outflow to the WNP, which has not been available. ©2016. American Geophysical Union. All Rights Reserved.
资助项目: 1920405 ; 24221001
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/62797
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: Graduate School of Environmental Sciences, Hokkaido University, Sapporo, Japan; Institute of Low Temperature Science, Hokkaido University, Sapporo, Japan; Chubu Institute for Advanced Studies, Chubu University, Kasugai, Japan; Department of Environmental Science and Analytical Chemistry (ACES), Bolin Centre for Climate Research, Stockholm University, Stockholm, Sweden; Division of Environmental and Life Sciences, Department of Food and Nutritional Sciences, University of Shisuoka, Shizuoka, Japan; Department of Earth Sciences, Faculty of Sciences, University of Toyama, Toyama, Japan

Recommended Citation:
Tyagi P.,Kawamura K.,Bikkina S.,et al. Hydroxy fatty acids in snow pit samples from Mount Tateyama in central Japan: Implications for atmospheric transport of microorganisms and plant waxes associated with Asian dust[J]. Journal of Geophysical Research: Atmospheres,2016-01-01,121(22)
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