DOI: 10.5194/cp-10-591-2014
Scopus记录号: 2-s2.0-84897068436
论文题名: Pulses of enhanced north Pacific intermediate water ventilation from the Okhotsk Sea and Bering Sea during the last deglaciation
作者: Max L. ; Lembke-Jene L. ; Riethdorf J.-R. ; Tiedemann R. ; Nürnberg D. ; Kühn H. ; MacKensen A.
刊名: Climate of the Past
ISSN: 18149324
出版年: 2014
卷: 10, 期: 2 起始页码: 591
结束页码: 605
语种: 英语
Scopus关键词: carbon isotope
; deep water
; general circulation model
; Heinrich event
; intermediate water
; last deglaciation
; meridional circulation
; radiocarbon dating
; reconstruction
; stable isotope
; ventilation
; water depth
; Younger Dryas
; Bering Sea
; Pacific Ocean
; Pacific Ocean (Northwest)
; Sea of Okhotsk
英文摘要: Under modern conditions only North Pacific Intermediate Water is formed in the northwest Pacific Ocean. This situation might have changed in the past. Recent studies with general circulation models indicate a switch to deep-water formation in the northwest Pacific during Heinrich Stadial 1 (17.5-15.0 ka) of the last glacial termination. Reconstructions of past ventilation changes based on paleoceanographic proxy records are still insufficient to test whether a deglacial mode of deep-water formation in the North Pacific Ocean existed. Here we present deglacial ventilation records based on radiocarbon-derived ventilation ages in combination with epibenthic stable carbon isotopes from the northwest Pacific including the Okhotsk Sea and Bering Sea, the two potential source regions for past North Pacific ventilation changes. Evidence for most rigorous ventilation of the intermediate-depth North Pacific occurred during Heinrich Stadial 1 and the Younger Dryas, simultaneous to significant reductions in Atlantic Meridional Overturning Circulation. Concurrent changes in δ13C and ventilation ages point to the Okhotsk Sea as driver of millennial-scale changes in North Pacific Intermediate Water ventilation during the last deglaciation. Our records additionally indicate that changes in the δ13C intermediate-water (700-1750 m water depth) signature and radiocarbon-derived ventilation ages are in antiphase to those of the deep North Pacific Ocean (>2100 m water depth) during the last glacial termination. Thus, intermediate-and deep-water masses of the northwest Pacific have a differing ventilation history during the last deglaciation. © 2014 Author (s). Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/49293
Appears in Collections: 气候变化与战略
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Recommended Citation:
Max L.,Lembke-Jene L.,Riethdorf J.-R.,et al. Pulses of enhanced north Pacific intermediate water ventilation from the Okhotsk Sea and Bering Sea during the last deglaciation[J]. Climate of the Past,2014-01-01,10(2)