Enhanced upwelling in the eastern equatorial Pacific at the last five glacial terminations

bin Shaari, Hasrizal; Yamamoto, Masanobu; Irino, Tomohisa

doi:10.1016/j.palaeo.2013.03.022


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Enhanced upwelling in the eastern equatorial Pacific at the last five glacial terminations

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Please use this identifier to cite or link to this item:http://hdl.handle.net/2115/53618

Title:	Enhanced upwelling in the eastern equatorial Pacific at the last five glacial terminations
Authors:	bin Shaari, Hasrizal Browse this author
	Yamamoto, Masanobu Browse this author →KAKEN DB
	Irino, Tomohisa Browse this author →KAKEN DB
Keywords:	TEX86
	UK37 '
	Eastern equatorial Pacific
	Upwelling
	Deglaciation
Issue Date:	15-Sep-2013
Publisher:	Elsevier Science B.V.
Journal Title:	Palaeogeography palaeoclimatology palaeoecology
Volume:	386
Start Page:	8
End Page:	15
Publisher DOI:	10.1016/j.palaeo.2013.03.022
Abstract:	TEX86H- and UK37′-derived paleotemperatures, and isoprenoid glycerol dialkyl glycerol tetraether (GDGT), and alkenone concentrations were examined for ODP Site 1239 in the eastern equatorial Pacific (EEP) for the last 430 kyr. We propose that the difference between TEX86H- and UK37′-derived temperatures (∆T) and the abundance ratio of GDGTs to alkenones (GDGT/alkenone ratio) are potential upwelling indices which show consistent results with other upwelling indices. The ∆T and GDGT/alkenone ratio were maximal during the last five deglaciations, suggesting intensified upwelling. The intensification of upwelling in the EEP coincided with those at the Peru margin and in the Southern Ocean. This coincidence suggests that the reorganization of the Southern Hemisphere atmospheric circulation induced the intensification of the subtropical high-pressure cell, causing stronger southeast trade winds along the west coast of South America and the southern westerlies over the Southern Ocean, enhancing upwelling in both regions.
Rights:	Copyright © 2013 Elsevier B.V. All rights reserved.
Relation:	http://www.sciencedirect.com/science/article/pii/S0031018213001600#
Type:	article (author version)
URI:	http://hdl.handle.net/2115/53618
Appears in Collections:	環境科学院・地球環境科学研究院 (Graduate School of Environmental Science / Faculty of Environmental Earth Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 山本正伸

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