DOI: 10.1016/j.epsl.2018.04.024
Scopus记录号: 2-s2.0-85046348002
论文题名: Ocean and atmosphere teleconnections modulate east tropical Pacific productivity at late to middle Pleistocene terminations
作者: Diz P. ; Hernández-Almeida I. ; Bernárdez P. ; Pérez-Arlucea M. ; Hall I.R.
刊名: Earth and Planetary Science Letters
ISSN: 0012821X
出版年: 2018
卷: 493 起始页码: 82
结束页码: 91
语种: 英语
英文关键词: benthic foraminifera
; East Equatorial Pacific
; Intertropical Convergence Zone
; paleoproductivity
; Pleistocene terminations
; teleconnections
Scopus关键词: Carbon dioxide
; Earth atmosphere
; Nutrients
; Benthic foraminifera
; Equatorial Pacific
; Intertropical convergence zone
; Paleoproductivity
; Pleistocene
; Teleconnections
; Glacial geology
; air-sea interaction
; benthic foraminifera
; climate variation
; intertropical convergence zone
; paleoceanography
; paleoclimate
; paleoproductivity
; Pleistocene
; proxy climate record
; teleconnection
; Pacific Ocean
; Pacific Ocean (East)
; Pacific Ocean (Equatorial)
; Pacific Ocean (Tropical)
; Foraminifera
英文摘要: The modern Eastern Equatorial Pacific (EEP) is a key oceanographic region for regulating the Earth's climate system, accounting for between 5–10% of global marine production whilst also representing a major source of carbon dioxide efflux to the atmosphere. Changes in ocean dynamics linked to the nutrient supply from the Southern Ocean have been suggested to have played a dominant role in regulating EEP productivity over glacial–interglacial timescales of the past 500 ka. Yet, the full extent of the climate and oceanic teleconnections and the mechanisms promoting the observed increase of productivity occurring at glacial terminations remain poorly understood. Here we present multi-proxy, micropaleontological, geochemical and sedimentological records from the easternmost EEP to infer changes in atmospheric patterns and oceanic processes potentially influencing regional primary productivity over glacial–interglacial cycles of the mid-late Pleistocene (∼0–650 ka). These proxy data support a leading role for the north–south migration of the Intertropical Convergence Zone (ITCZ) in shaping past productivity variability in the EEP. Productivity increases during glacial periods and notably peaks at major and “extra” glacial terminations (those occurring 1–2 precession cycles after some major terminations) coincident with the inferred southernmost position of the ITCZ. The comparison of our reconstructions with proxy records of climate variability suggests the intensification of related extratropical atmospheric and oceanic teleconnections during deglaciation events. These processes may have re-activated the supply of southern sourced nutrients to the EEP, potentially contributing to enhanced productivity in the EEP and thus counterbalancing the oceanic carbon dioxide outgassing at glacial terminations. © 2018 Elsevier B.V. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/109871
Appears in Collections: 影响、适应和脆弱性 气候变化事实与影响
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作者单位: Dept. Marine Geosciences, Faculty of Sciences, University of Vigo36310, Spain; Geological Institute, Department of Earth Science, ETH, Zürich, 8092, Switzerland; School of Earth and Ocean Sciences, Cardiff UniversityCF10 3AT, United Kingdom
Recommended Citation:
Diz P.,Hernández-Almeida I.,Bernárdez P.,et al. Ocean and atmosphere teleconnections modulate east tropical Pacific productivity at late to middle Pleistocene terminations[J]. Earth and Planetary Science Letters,2018-01-01,493