DOI: 10.1016/j.gloplacha.2016.08.001
论文题名: Interglacial/glacial changes in coccolith-rich deposition in the SW Pacific Ocean: An analogue for a warmer world?
作者: Duncan B. ; Carter L. ; Dunbar G. ; Bostock H. ; Neil H. ; Scott G. ; Hayward B.W. ; Sabaa A.
刊名: Global and Planetary Change
ISSN: 0921-8181
出版年: 2016
卷: 144 起始页码: 252
结束页码: 262
语种: 英语
英文关键词: Coccolithophores
; Interglacial/glacial change
; Productivity
; Southwest Pacific Ocean
Scopus关键词: Atmospheric temperature
; Deposition
; Glacial geology
; Nutrients
; Productivity
; Sediments
; Submarine geology
; Surface waters
; Tropics
; Coccolithophores
; Environmental proxies
; Environmental reconstruction
; Interglacial/glacial change
; Ocean drilling programs
; Pacific ocean
; Phytoplankton productions
; Satellite observations
; Oceanography
; Foraminifera
; Haptophyceae
英文摘要: Satellite observations of middle to high latitudes show that modern ocean warming is accompanied by increased frequency and poleward expansion of coccolithophore blooms. However, the outcomes of such events and their causal processes are unclear. In this study, marine sediment cores are used to investigate past coccolithophore production north and south of the Subtropical Front. Calcareous pelagites from subtropical waters off northernmost New Zealand (site P71) and from subantarctic waters on Campbell Plateau (Ocean Drilling Program [ODP] site 1120C) record marked changes in pelagite deposition. At both locations, foraminiferal-rich sediments dominate glacial periods whereas coccolith-rich sediments characterise specific interglacial periods. Sediment grain size has been used to determine relative abundances of coccoliths and foraminifers. Results show coccoliths prevailed around certain Marine Isotope Stage (MIS) transitions, at MIS 7b/a and MIS 2/1 at P71, and at MIS 6/5e at ODP 1120C. Palaeo-environmental proxies suggest that coccolithophore production and deposition at P71 reflect enhanced nutrient availability associated with intense winter mixing in the subtropical Tasman Sea. An increased inflow of that warm, micronutrient-bearing subtropical water in concert with upper ocean thermal stratification in late spring/summer, led to peak phytoplankton production. At ODP 1120C during MIS 6/5e, an increased inflow of subtropical water, warm sea surface temperatures and a thermally stratified upper ocean also favoured coccolithophore production. These palaeo-environmental reconstructions together with model simulations suggest that (i) future subtropical coccolithophore production at P71 is unlikely to reach abundances recorded during MIS 7b/a but (ii) future subantarctic production is likely to dominate sedimentation over Campbell Plateau as modern conditions trend towards those prevalent during MIS 5e. © 2016 Elsevier B.V. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84981719107&doi=10.1016%2fj.gloplacha.2016.08.001&partnerID=40&md5=eb80d74e2779c8d04f225e3f8301bed2
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/11636
Appears in Collections: 全球变化的国际研究计划 气候变化与战略
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作者单位: Antarctic Research Centre, Victoria University of Wellington, P.O. Box 600, Wellington, New Zealand
Recommended Citation:
Duncan B.,Carter L.,Dunbar G.,et al. Interglacial/glacial changes in coccolith-rich deposition in the SW Pacific Ocean: An analogue for a warmer world?[J]. Global and Planetary Change,2016-01-01,144.