气候变化领域集成服务门户(CCPortal): Hydrothermal carbon release to the ocean and atmosphere from the eastern equatorial Pacific during the last glacial termination

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DOI	10.1088/1748-9326/aafe28
	Hydrothermal carbon release to the ocean and atmosphere from the eastern equatorial Pacific during the last glacial termination
	Stott L.D.; Harazin K.M.; Quintana Krupinski N.B.
发表日期	2019
ISSN	17489318
卷号	14 期号:2
英文摘要	Arguably among the most globally impactful climate changes in Earth's past million years are the glacial terminations that punctuated the Pleistocene epoch. With the acquisition and analysis of marine and continental records, including ice cores, it is now clear that the Earth's climate was responding profoundly to changes in greenhouse gases that accompanied those glacial terminations. But the ultimate forcing responsible for the greenhouse gas variability remains elusive. The oceans must play a central role in any hypothesis that attempt to explain the systematic variations in pCO 2 because the Ocean is a giant carbon capacitor, regulating carbon entering and leaving the atmosphere. For a long time, geological processes that regulate fluxes of carbon to and from the oceans were thought to operate too slowly to account for any of the systematic variations in atmospheric pCO 2 that accompanied glacial cycles during the Pleistocene. Here we investigate the role that Earth's hydrothermal systems had in affecting the flux of carbon to the ocean and ultimately, the atmosphere during the last glacial termination. We document late glacial and deglacial intervals of anomalously old 14 C reservoir ages, large benthic-planktic foraminifera 14 C age differences, and increased deposition of hydrothermal metals in marine sediments from the eastern equatorial Pacific (EEP) that indicate a significant release of hydrothermal fluids entered the ocean at the last glacial termination. The large 14 C anomaly was accompanied by a ∼4-fold increase in Zn/Ca in both benthic and planktic foraminifera that reflects an increase in dissolved [Zn] throughout the water column. Foraminiferal B/Ca and Li/Ca results from these sites document deglacial declines in [] throughout the water column; these were accompanied by carbonate dissolution at water depths that today lie well above the calcite lysocline. Taken together, these results are strong evidence for an increased flux of hydrothermally-derived carbon through the EEP upwelling system at the last glacial termination that would have exchanged with the atmosphere and affected both Δ 14 C and pCO 2 . These data do not quantify the amount of carbon released to the atmosphere through the EEP upwelling system but indicate that geologic forcing must be incorporated into models that attempt to simulate the cyclic nature of glacial/interglacial climate variability. Importantly, these results underscore the need to put better constraints on the flux of carbon from geologic reservoirs that affect the global carbon budget. © 2019 The Author(s). Published by IOP Publishing Ltd.
英文关键词	glacial termination; hydrothermal carbon; pCO 2
语种	英语
scopus关键词	Budget control; Calcite; Carbon; Climate change; Climate models; Earth atmosphere; Greenhouse gases; Oceanography; Submarine geology; Eastern equatorial Pacific; Glacial terminations; Hydrothermal carbons; Hydrothermal system; Last glacial terminations; pCO2; Planktic foraminifera; Systematic variation; Glacial geology; atmosphere-ocean coupling; benthic foraminifera; calcite; carbon budget; carbon dioxide; carbon flux; climate change; dissolution; glacial-interglacial cycle; greenhouse gas; hydrothermal fluid; hydrothermal system; Last Glacial; late glacial; planktonic foraminifera; Pleistocene; Pacific Ocean; Pacific Ocean (Equatorial); Foraminifera
来源期刊	Environmental Research Letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/154688
作者单位	Department of Earth Sciences, University of Southern California, United States; Research School of Earth Sciences, Australian National University, Australia; Department of Geology, Lund University, Sweden
推荐引用方式 GB/T 7714	Stott L.D.,Harazin K.M.,Quintana Krupinski N.B.. Hydrothermal carbon release to the ocean and atmosphere from the eastern equatorial Pacific during the last glacial termination[J],2019,14(2).
APA	Stott L.D.,Harazin K.M.,&Quintana Krupinski N.B..(2019).Hydrothermal carbon release to the ocean and atmosphere from the eastern equatorial Pacific during the last glacial termination.Environmental Research Letters,14(2).
MLA	Stott L.D.,et al."Hydrothermal carbon release to the ocean and atmosphere from the eastern equatorial Pacific during the last glacial termination".Environmental Research Letters 14.2(2019).