气候变化领域集成服务门户(CCPortal): Late quaternary sea-ice and sedimentary redox conditions in the eastern Bering Sea – Implications for ventilation of the mid-depth North Pacific and an Atlantic-Pacific seesaw mechanism

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DOI	10.1016/j.quascirev.2020.106549
	Late quaternary sea-ice and sedimentary redox conditions in the eastern Bering Sea – Implications for ventilation of the mid-depth North Pacific and an Atlantic-Pacific seesaw mechanism
	Detlef H.; Sosdian S.M.; Belt S.T.; Smik L.; Lear C.H.; Kender S.; Pearce C.; Hall I.R.
发表日期	2020
ISSN	0277-3791
卷号	248
英文摘要	On glacial-interglacial and millennial timescales, sea ice is an important player in the circulation and primary productivity of high latitude oceans, affecting regional and global biogeochemical cycling. In the modern North Pacific, brine rejection during sea-ice freezing in the Sea of Okhotsk drives the formation of North Pacific Intermediate Water (NPIW) that ventilates the North Pacific Ocean at 300 m–1000 m water depth. Glacial intervals of the late Quaternary, however, experienced a deepening of glacial NPIW to at least 2000 m, with the strongest ventilation observed during cold stadial conditions of the last deglaciation. However, the origin of the shifts in NPIW ventilation is poorly understood. Numerical simulations suggest an atmospheric teleconnection between the North Atlantic and the North Pacific, in response to a slowdown or shutdown of the Atlantic meridional overturning circulation. This leads to a build-up of salinity in the North Pacific surface ocean, triggering deep ventilation. Alternatively, increased sea-ice formation in the North Pacific and its marginal seas may have caused strengthened overturning in response to enhanced brine rejection. Here we use a multi-proxy approach to explore sea-ice dynamics, sedimentary redox chemistry, and benthic ecology at Integrated Ocean Drilling Program Site U1343 in the eastern Bering Sea across the last 40 ka. Our results suggest that brine rejection from enhanced sea-ice formation during early Heinrich Stadial 1 locally weakened the halocline, aiding in the initiation of deep overturning. Additionally, deglacial sea-ice retreat likely contributed to increased primary productivity and expansion of mid-depth hypoxia at Site U1343 during interstadial conditions, confirming a vital role of sea ice in the deglacial North Pacific carbon cycle. © 2020 Elsevier Ltd
英文关键词	Bering Sea; Foraminiferal assemblages; Foraminiferal geochemistry; Late Quaternary; Marine biomarkers; Northern Pacific; NPIW; Paleoceanography; U/Mn
语种	英语
scopus关键词	Glacial geology; Oceanography; Photosynthesis; Phytoplankton; Sedimentology; Ventilation; Atlantic meridional overturning circulations; Benthic ecologies; Biogeochemical cycling; Eastern bering seas; Integrated ocean drilling programs; North Pacific Ocean; Primary productivity; Sea ice formations; Sea ice; glacial-interglacial cycle; glacier retreat; Heinrich event; intermediate water; last deglaciation; Ocean Drilling Program; Quaternary; redox conditions; sea ice; spatiotemporal analysis; teleconnection; Atlantic Ocean; Atlantic Ocean (North); Bering Sea; Pacific Ocean; Pacific Ocean; Sea of Okhotsk
来源期刊	Quaternary Science Reviews
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/151288
作者单位	Department of Geoscience, Aarhus University, Høegh-Guldbergs Gade 2, Aarhus C, 8000, Denmark; Arctic Research Centre, Aarhus University, Ny Munkegade 114, Aarhus C, 8000, Denmark; School of Earth and Ocean Sciences Cardiff University, Main Building, Park Place, Cardiff, CF10 3AT, United Kingdom; School of Geography, Earth and Environmental Sciences, University of Plymouth, Plymouth, PL4 8AA, United Kingdom; University of Exeter, Camborne School of Mines, Penryn, Cornwall, TR10 9FE, United Kingdom
推荐引用方式 GB/T 7714	Detlef H.,Sosdian S.M.,Belt S.T.,等. Late quaternary sea-ice and sedimentary redox conditions in the eastern Bering Sea – Implications for ventilation of the mid-depth North Pacific and an Atlantic-Pacific seesaw mechanism[J],2020,248.
APA	Detlef H..,Sosdian S.M..,Belt S.T..,Smik L..,Lear C.H..,...&Hall I.R..(2020).Late quaternary sea-ice and sedimentary redox conditions in the eastern Bering Sea – Implications for ventilation of the mid-depth North Pacific and an Atlantic-Pacific seesaw mechanism.Quaternary Science Reviews,248.
MLA	Detlef H.,et al."Late quaternary sea-ice and sedimentary redox conditions in the eastern Bering Sea – Implications for ventilation of the mid-depth North Pacific and an Atlantic-Pacific seesaw mechanism".Quaternary Science Reviews 248(2020).