The behaviour of the Leeuwin Current offshore NW Australia during the last five glacial-interglacial cycles
Spooner, MI; De Deckker, P; Barrows, TT; Fifield, LK; patrick.dedeckker@anu.edu.au
2011
发表期刊GLOBAL AND PLANETARY CHANGE
ISSN0921-8181
卷号75期号:40606页码:119-132
摘要The Leeuwin Current is an anomalous eastern boundary current along the western Australian coast. To investigate its behaviour through time, we studied core MD002361 obtained from below the present-day pathway of the Leeuwin Current offshore the NW tip of Western Australia. Planktonic foraminifera assemblages, sea-surface temperature estimates reconstructed from those assemblages, together with the delta O-18 and delta C-13 signals of near-surface dwelling foraminifera (Globigerinoides ruber), were used to reconstruct the vertical structure of the water column for the past 500 ka. Our findings indicate that the Leeuwin Current was present along the western coastline of Australia even during glacial periods. During those times, there was a greater influence of South Indian Subtropical Water (STW) and South Indian Central Water (SICW) due to a 3-4 degrees northward migration of the Indonesian Throughflow Water/South Indian Central Water frontal system. This resulted in an overall 6-9 degrees C decrease in SST, paralleled by a thickening and greater homogeneity of the mixed layer. The increased influence of STW and SICW also suggests that the West Australian Current, which presently sits below the Leeuwin Current, was strengthened during the glacial periods and contributed to a weakening of the Leeuwin Current. Conversely, the Leeuwin Current was 'stronger' during interglacial periods due to a thicker component of Indonesian Throughflow Water sourced from the Indo Pacific Warm Pool. This was particularly the case during marine isotope stage 5.5 (MIS) and the 'super' interglacial MIS 11. (C) 2010 Elsevier B.V. All rights reserved.
部门归属[De Deckker, Patrick] Australian Natl Univ, Res Sch Earth Sci, Canberra, ACT 0200, Australia; [Spooner, Michelle I.] Australian Natl Univ, Dept Earth & Marine Sci, Canberra, ACT 0200, Australia; [Barrows, Timothy T.] Univ Exeter, Coll Life & Environm Sci, Exeter EX4 4RJ, Devon, England; [Fifield, L. Keith] Australian Natl Univ, Res Sch Phys & Engn, Dept Nucl Phys, Canberra, ACT 0200, Australia
关键词Thermocline Depth Glacial Interglacial Planktonic Foraminifera Sea-surface Temperature Mis 11
学科领域Geography, Physical ; Geosciences, Multidisciplinary
URL查看原文
收录类别sci
文献类型期刊论文
条目标识符http://ir.scsio.ac.cn/handle/344004/8379
专题海洋科技动态信息-印太暖池系统研究
通讯作者patrick.dedeckker@anu.edu.au
推荐引用方式
GB/T 7714
Spooner, MI,De Deckker, P,Barrows, TT,et al. The behaviour of the Leeuwin Current offshore NW Australia during the last five glacial-interglacial cycles[J]. GLOBAL AND PLANETARY CHANGE,2011,75(40606):119-132.
APA Spooner, MI,De Deckker, P,Barrows, TT,Fifield, LK,&patrick.dedeckker@anu.edu.au.(2011).The behaviour of the Leeuwin Current offshore NW Australia during the last five glacial-interglacial cycles.GLOBAL AND PLANETARY CHANGE,75(40606),119-132.
MLA Spooner, MI,et al."The behaviour of the Leeuwin Current offshore NW Australia during the last five glacial-interglacial cycles".GLOBAL AND PLANETARY CHANGE 75.40606(2011):119-132.
条目包含的文件
条目无相关文件。
个性服务
推荐该条目
保存到收藏夹
查看访问统计
导出为Endnote文件
相关权益政策
暂无数据
收藏/分享
所有评论 (0)
暂无评论
 

除非特别说明,本系统中所有内容都受版权保护,并保留所有权利。