| DOI: | 10.1130/G46546.1
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| 论文题名: | Regional and global signals in seawater δ18O records across the mid-Pleistocene transition |
| 作者: | Ford H.L.; Raymo M.E.
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| 刊名: | Geology
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| ISSN: | 917613
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| 出版年: | 2020
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| 卷: | 48, 期:2 | | 语种: | 英语
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| Scopus关键词: | Oceanography
; Seawater
; Deep-ocean circulation
; Global ice volume
; Global patterns
; High resolution
; Ice volumes
; Marine isotope stages
; North Pacific Ocean
; Ocean drilling programs
; Ice
; benthos
; glacial-interglacial cycle
; marine isotope stage
; oxygen isotope
; paleoceanography
; Pleistocene
; salinity
; seawater
; water chemistry
; Pacific Ocean
; Pacific Ocean (North)
; Uvigerina
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| 英文摘要: | High-resolution seawater δ18O records, derived from coupled Mg/Ca and benthic δ18O analyses, can be used to evaluate how global ice volume changed during the mid-Pleistocene transition (MPT, ca. 1250-600 ka). However, such seawater δ18O records are also influenced by regional hydrographic signals (i.e., salinity) and changes in deep-ocean circulation across the MPT, making it difficult to isolate the timing and magnitude of the global ice volume change. To explore regional and global patterns in seawater δ18O records, we reconstruct seawater δ18O from coupled Mg/Ca and δ18O analyses of Uvigerina spp. at Ocean Drilling Program Site 1208 in the North Pacific Ocean. Comparison of individual seawater δ18O records suggests that deep-ocean circulation reorganized and the formation properties (i.e., salinity) of deepocean water masses changed at ca. 900 ka, likely related to the transition to marine-based ice sheets in Antarctica. We also find that an increase in ice volume likely accompanied the shift in glacial-interglacial periodicity observed in benthic carbonate δ18O across the MPT, with increases in ice volume observed during Marine Isotope Stages 22 and 16. © 2019 The Authors. Gold Open Access: This paper is published under the terms of the CC-BY license. |
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| 资源类型: | 期刊论文
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| 标识符: | http://119.78.100.158/handle/2HF3EXSE/159443
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| Appears in Collections: | 气候变化与战略
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作者单位: | Lamont-Doherty Earth Observatory, Columbia University, Palisades, NY 10964, United States
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| Recommended Citation: | |
Ford H.L.,Raymo M.E.. Regional and global signals in seawater δ18O records across the mid-Pleistocene transition[J]. Geology,2020-01-01,48(2)
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