DOI: 10.1016/j.quascirev.2013.09.022
Scopus记录号: 2-s2.0-84887208783
论文题名: Biological and climatic consequences of a cold, stratified, high latitude ocean
作者: Hays J.D. ; Martinson D.G. ; Morley J.J.
刊名: Quaternary Science Reviews
ISSN: 2773791
出版年: 2013
卷: 82 起始页码: 78
结束页码: 92
语种: 英语
英文关键词: Biological pump
; Deep sea cores
; Flux
; Glacial ocean
; Holocene
; North Pacific
; Ocean carbon sequestration
; Pleistocene
; Radiolaria
; Sea of Okhotsk
; Stratification
Scopus关键词: Biological pumps
; Deep sea
; Glacial ocean
; Holocenes
; North Pacific
; Ocean carbon sequestration
; Pleistocene
; Radiolaria
; Sea of Okhotsk
; Carbon dioxide
; Fluxes
; Nutrients
; Oceanography
; Sea ice
; Thermal stratification
; Glacial geology
; air-sea interaction
; alkalinity
; biological pump
; carbon dioxide
; carbon sequestration
; cold air
; concentration (composition)
; gas exchange
; glacial environment
; Holocene
; latitude
; marine environment
; Pleistocene
; protozoan
; sea ice
; Pacific Ocean
; Pacific Ocean (North)
; Sea of Okhotsk
英文摘要: The flux from deep- and shallow-living radiolarian assemblages provides evidence of a glacial, high latitude, cold ocean stratification that increased biological pump efficiency and promoted ocean carbon sequestration. Greater deep (>200m) than shallow-living (<200m) radiolarian assemblage flux characterizes glacial North Pacific (>45° N) sediments with the deep-living Cycladophora davisiana dominant (>24%). By contrast modern radiolarian flux consists primarily of shallow-living species (C.davisiana <10%). Clues to the cause of this unusual glacial radiolarian flux come from the presently, strongly stratified Sea of Okhotsk. Here beneath a thin nutrient depleted mixed layer radiolarian and zooplankton faunas conform to the sea's physical stratification with lower concentrations of both in a Cold (-1.5 to 1°C) Intermediate Layer (CIL) (20-125m) and higher concentrations in waters between 200 and 500m (Nimmergut and Abelmann, 2002). This biological stratification generates a radiolarian flux echoing that of the glacial northwest Pacific with C.davisiana 26% of total flux. Widespread C.davisiana percentages (>20%) in high latitude (>45°) glacial sediments of both hemispheres is evidence that these oceans were capped with an Okhotsk-Like Stratification (O-LS). O-LS provides mechanisms to (1) strip nutrients from surface waters depriving the deep-ocean of preformed nutrients, increasing biological pump efficiency and (2) deepen carbon re-mineralization increasing deep-ocean alkalinity. Both may have contributed to lower glacial atmospheric CO2 concentrations. O-LS would also have amplified glacial climatic cycles by promoting the spread of high latitude sea ice in winter as occurs in the Sea of Okhotsk today, and reducing gas exchange between ocean and atmosphere in summer. © 2013 Elsevier Ltd. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60443
Appears in Collections: 过去全球变化的重建
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作者单位: Columbia University, Lamont Doherty Earth Observatory, P.O. Box 1000 Palisades, NY 10964, United States; Lamont Doherty Earth Observatory, Dept of Earth and Environmental Sciences, Columbia University, United States; Lamont Doherty Earth Observatory, United States
Recommended Citation:
Hays J.D.,Martinson D.G.,Morley J.J.. Biological and climatic consequences of a cold, stratified, high latitude ocean[J]. Quaternary Science Reviews,2013-01-01,82