Patagonian dust, Agulhas Current, and Antarctic ice- rafted debris contributions to the South Atlantic Ocean over the past 150,000 years

doi:10.1073/pnas.2402120121

NIGPAS OpenIR

	Patagonian dust, Agulhas Current, and Antarctic ice- rafted debris contributions to the South Atlantic Ocean over the past 150,000 years
通讯作者	Barkley, Anne E.([email protected]) ; Winckler, Gisela([email protected]) ; Kaplan, Michael R.([email protected]) ; Goldstein, Steven L.([email protected])
	Barkley, Anne E.1,2; Winckler, Gisela 2,3; Recasens, Cristina 2; Kaplan, Michael R.2; Koffman, Bess G.4; Calabozo, Fernando 5; Middleton, Jennifer L.2; Anderson, Robert F.2,3; Cai, Yue 6,7; Bolge, Louise 2
	2024-07-30
发表期刊	PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
ISSN	0027-8424
卷号	121 期号:31 页码:12
摘要	Disentangling inputs of aeolian dust, ice- rafted debris (IRD), and eroded continental detritus delivered by ocean currents to marine sediments provide important insights into Earth System processes and climate. This study uses Sr-Nd-Pb isotope ratios of the continent- derived (lithogenic) fraction in deep- sea core TN057-6 from the subantarctic Southern Ocean southwest of Africa over the past 150,000 y to identify source regions and quantify their relative contributions and fluxes utilizing a mixing model set in a Bayesian framework. The data are compared with proxies from parallel core Ocean Drilling Program Site 1090 and newly presented data from potential South America aeolian dust source areas (PSAs), allowing for an integrated investigation into atmospheric, oceanic, and cryospheric dynamics. PSA inputs varied on glacial/interglacial timescales, with southern South American sources dominating up to 88% of the lithogenic fraction (mainly Patagonia, which provided up to 68%) during cold periods, while southern African sources were more important during interglacials. During the warmer Marine Isotope Stage (MIS) 3 of the last glacial period, lithogenic fluxes were twice that of colder MIS2 and MIS4 at times, and showed unique isotope ratios best explained by Antarctic- derived IRD, likely from the Weddell Sea. The IRD intrusions contributed up to 41% at times and followed Antarctic millennial warming events that raised temperatures, causing instability of icesheet margins. High IRD was synchronous with increased bioavailable iron, nutrient utilization, high biological productivity, and decreased atmospheric CO2. Overall, TN057-6 sediments record systematic Southern Hemisphere climate shifts and cryospheric changes that impacted biogeochemical cycling on both glacial/interglacial and subglacial timescales.
关键词	ice- rafted debris dust Southern Ocean provenance climate
DOI	10.1073/pnas.2402120121
收录类别	SCI
语种	英语
关键词[WOS]	LAST GLACIAL MAXIMUM ; DOME C ; TERRIGENOUS SEDIMENT ; ISOTOPIC CONSTRAINTS ; EAST ANTARCTICA ; NORTH-ATLANTIC ; WEDDELL SEA ; GRAIN-SIZE ; PROVENANCE ; ND
资助项目	Lamont Postdoctoral Fellowship ; Vetlesen Foundation ; Swiss NSF Postdoctoral Fellowship ; LDEO Climate Center ; NASA- GISS ; NSF Postdoctoral Fellowship[OPP 1204050] ; NSF[OCE 0823507] ; Storke Endowment of the Department of Earth and Environmental Sciences, Columbia University
WOS研究方向	Science & Technology - Other Topics
WOS类目	Multidisciplinary Sciences
WOS记录号	WOS:001348568400001
项目资助者	Lamont Postdoctoral Fellowship ; Vetlesen Foundation ; Swiss NSF Postdoctoral Fellowship ; LDEO Climate Center ; NASA- GISS ; NSF Postdoctoral Fellowship ; NSF ; Storke Endowment of the Department of Earth and Environmental Sciences, Columbia University
出版者	NATL ACAD SCIENCES
文献类型	期刊论文
条目标识符	http://ir.nigpas.ac.cn/handle/332004/44536
专题	中国科学院南京地质古生物研究所
通讯作者	Barkley, Anne E.; Winckler, Gisela; Kaplan, Michael R.; Goldstein, Steven L.
作者单位	1.US EPA, Ctr Publ Hlth & Environm Assessment, Off Res & Dev, Washington, DC 20004 USA 2.Columbia Univ, Div Geochem, Lamont Doherty Earth Observ, Palisades, NY 10964 USA 3.Columbia Univ, Dept Earth & Environm Sci, New York, NY 10027 USA 4.Colby Coll, Dept Geol, Waterville, ME 04901 USA 5.Ctr Invest Ciencias Tierra, Ciudad Univ,X5016CGA, Cordoba, Argentina 6.Chinese Acad Sci, Nanjing Inst Geol & Palaeontol, Nanjing 210008, Peoples R China 7.Chinese Acad Sci, Ctr Excellence Life & Paleoenvironment, Nanjing 210008, Peoples R China 8.Carl von Ossietzky Univ Oldenburg, Marine Isotope Geochem, Inst Chem & Biol Marine Environm, D-26129 Oldenburg, Germany 9.Northumbria Univ, Dept Geog & Environm Sci, Newcastle Upon Tyne NE1 8ST, England
推荐引用方式 GB/T 7714	Barkley, Anne E.,Winckler, Gisela,Recasens, Cristina,et al. Patagonian dust, Agulhas Current, and Antarctic ice- rafted debris contributions to the South Atlantic Ocean over the past 150,000 years[J]. PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,2024,121(31):12.
APA	Barkley, Anne E..,Winckler, Gisela.,Recasens, Cristina.,Kaplan, Michael R..,Koffman, Bess G..,...&Goldstein, Steven L..(2024).Patagonian dust, Agulhas Current, and Antarctic ice- rafted debris contributions to the South Atlantic Ocean over the past 150,000 years.PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA,121(31),12.
MLA	Barkley, Anne E.,et al."Patagonian dust, Agulhas Current, and Antarctic ice- rafted debris contributions to the South Atlantic Ocean over the past 150,000 years".PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA 121.31(2024):12.