globalchange  > 过去全球变化的重建
DOI: 10.1016/j.quascirev.2017.03.012
Scopus记录号: 2-s2.0-85016146550
论文题名:
Penultimate and last glacial oceanographic variations in the Bering Sea on millennial timescales: Links to North Atlantic climate
作者: Ovsepyan E.A.; Ivanova E.V.; Lembke-Jene L.; Max L.; Tiedemann R.; Nürnberg D.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2017
卷: 163
起始页码: 135
结束页码: 151
语种: 英语
英文关键词: Benthic and planktic foraminifera ; Bering Sea ; Glacial terminations ; Intermediate-water ventilation ; Millennial-scale variability ; Paleoproductivity ; Penultimate and last glacial ; Sea ice ; Teleconnections
Scopus关键词: Ice ; Sea ice ; Submarine geology ; Surface waters ; Bering sea ; Glacial terminations ; Intermediate waters ; Last glacial ; Millennial-scale variability ; Paleoproductivity ; Planktic foraminifera ; Teleconnections ; Glacial geology ; Foraminifera
英文摘要: We present high-resolution multi-proxy records from a marine sediment core (SO201-2-85KL) from the western Bering Sea to assess orbital- and millennial-scale paleoceanographic conditions during two last glacial intervals, including both terminations. Based on changes in foraminiferal assemblages, grain-size content and previously published TOC and δ13C records, we reconstruct variations in sea-surface biological productivity, intermediate-water oxygenation and sea-ice conditions during the last 180 kyr. Our data demonstrate remarkable differences between the penultimate (MIS 6) and last (MIS 4-2) glacial. Relatively high sea surface bioproductivity and reduced sea-ice cover are reconstructed for the penultimate glacial interval, whereas low bioproductivity and expanded sea-ice cover appear to be typical for the last glacial. Millennial-scale changes in intermediate water ventilation are inferred from faunal records for the middle part of the penultimate glacial. High-amplitude environmental variability during the penultimate glacial time in the Bering Sea resembles the well-known Dansgaard-Oeschger oscillations, and roughly corresponds to similar rapid climatic fluctuations found in North Atlantic records. The Termination II and I intervals display a similar succession of high-bioproductivity events, being more pronounced during the penultimate glacial-interglacial transition, probably due to the different orbital configuration. During the late phase of Termination II, two short intervals, characterized by high sea surface bioproductivity and low oxygen content of bottom waters, resemble the Bølling and Allerød warmings, whereas an episode with low bioproductivity occurs in between, similar to the Older Dryas. Our results provide support for a close circumpolar coupling between high-latitude environments on millennial timescales at least since the penultimate glacial. © 2017 Elsevier Ltd
资助项目: The authors thank H.A. Bauch and I.O. Murdmaa for useful comments and fruitful discussions, Natalia Grechikhina, Lisa Schönborn and Andreas Mackensen are thanked for technical assistance in counting terrigenous grains from 0.25 to 1 mm fraction and for stable isotope analyses, respectively. We are grateful to Aline Govin and another anonymous reviewer for constructive comments and suggestions. This work was supported by the Otto-Schmidt Laboratory for Polar and Marine Research (OSL fellowship program), Russian Foundation for Basic Research grant (no. 16-35-60063), German Federal Ministry for Education and Research (BMBF) grant (SIGEPAX, no. 03F0704A), AWI funding and the national Helmholtz REKLIM initiative.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/59262
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作者单位: P.P. Shirshov Institute of Oceanology Russian Academy of Sciences, 36 Nakhimovsky Prospekt, Moscow, Russian Federation; Alfred-Wegener-Institut, Helmholtz-Zentrum für Polar- und Meeresforschung, Am Handelshafen 12, Bremerhaven, Germany; GEOMAR, Helmholtz-Zentrum für Ozeanforschung Kiel, Wischhofstr. 1–3, Kiel, Germany

Recommended Citation:
Ovsepyan E.A.,Ivanova E.V.,Lembke-Jene L.,et al. Penultimate and last glacial oceanographic variations in the Bering Sea on millennial timescales: Links to North Atlantic climate[J]. Quaternary Science Reviews,2017-01-01,163
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