气候变化领域集成服务门户(CCPortal): Sensitivity of Holocene East Antarctic productivity to subdecadal variability set by sea ice

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DOI	10.1038/s41561-021-00816-y
	Sensitivity of Holocene East Antarctic productivity to subdecadal variability set by sea ice
	Johnson K.M.; McKay R.M.; Etourneau J.; Jiménez-Espejo F.J.; Albot A.; Riesselman C.R.; Bertler N.A.N.; Horgan H.J.; Crosta X.; Bendle J.; Ashley K.E.; Yamane M.; Yokoyama Y.; Pekar S.F.; Escutia C.; Dunbar R.B.
发表日期	2021
ISSN	1752-0894
卷号	14 期号:10
英文摘要	Antarctic sea-ice extent, primary productivity and ocean circulation represent interconnected systems that form important components of the global carbon cycle. Subdecadal to centennial-scale variability can influence the characteristics and interactions of these systems, but observational records are too short to evaluate the impacts of this variability over longer timescales. Here, we use a 170-m-long sediment core collected from Integrated Ocean Drilling Program Site U1357B, offshore Adélie Land, East Antarctica to disentangle the impacts of sea ice and subdecadal climate variability on phytoplankton bloom frequency over the last ~11,400 years. We apply X-ray computed tomography, Ice Proxy for the Southern Ocean with 25 carbon atoms, diatom, physical property and geochemical analyses to the core, which contains an annually resolved, continuously laminated archive of phytoplankton bloom events. Bloom events occurred annually to biennially through most of the Holocene, but became less frequent (~2–7 years) at ~4.5 ka when coastal sea ice intensified. We propose that coastal sea-ice intensification subdued annual sea-ice break-out, causing an increased sensitivity of sea-ice dynamics to subdecadal climate modes, leading to a subdecadal frequency of bloom events. Our data suggest that projected loss of coastal sea ice will impact the influence of subdecadal variability on Antarctic margin primary productivity, altering food webs and carbon-cycling processes at seasonal timescales. © 2021, The Author(s), under exclusive licence to Springer Nature Limited.
语种	英语
scopus关键词	circulation; climate; Holocene; Ocean Drilling Program; productivity; sea ice; Antarctica; East Antarctica; Southern Ocean
来源期刊	Nature Geoscience
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/250860
作者单位	GNS Science, Lower Hutt, New Zealand; Antarctic Research Centre, Victoria University of Wellington, Wellington, New Zealand; Andaluz Institute of Earth Sciences, CSIC-University of Granada, Granada, Spain; EPHE, PSL University, Paris, France; UMR 5805 EPOC CNRS, University of Bordeaux, Bordeaux, France; Biogeochemistry Center, JAMSTEC, Yokosuka, Japan; Department of Geology, University of Otago, Dunedin, New Zealand; Department of Marine Science, University of Otago, Dunedin, New Zealand; School of Geography, Earth, and Environmental Sciences, University of Birmingham, Birmingham, United Kingdom; Institute for Space–Earth Environmental Research (ISEE), Nagoya University, Nagoya, Japan; Analytical Center for Environmental Study, Atmosphere and Ocean Research Institute, University of Tokyo, Kashiwa, Japan; School of Earth and Environmental Sciences, City University of New York - Queens College, New York, NY, United States; School of Earth, Energy, and Environmental Sciences, Stanford University, Stanford, C...
推荐引用方式 GB/T 7714	Johnson K.M.,McKay R.M.,Etourneau J.,et al. Sensitivity of Holocene East Antarctic productivity to subdecadal variability set by sea ice[J],2021,14(10).
APA	Johnson K.M..,McKay R.M..,Etourneau J..,Jiménez-Espejo F.J..,Albot A..,...&Dunbar R.B..(2021).Sensitivity of Holocene East Antarctic productivity to subdecadal variability set by sea ice.Nature Geoscience,14(10).
MLA	Johnson K.M.,et al."Sensitivity of Holocene East Antarctic productivity to subdecadal variability set by sea ice".Nature Geoscience 14.10(2021).