Response of surface water masses and circulation to late Quaternary climate change east of New Zealand

被引:111
作者
Weaver, PPE
Carter, L
Neil, HL
机构
[1] Southampton Oceanog Ctr, Southampton SO14 3ZH, Hants, England
[2] Natl Inst Water & Atmosphere, Wellington, New Zealand
来源
PALEOCEANOGRAPHY | 1998年 / 13卷 / 01期
关键词
D O I
10.1029/97PA02982
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
A series of cores from east of New Zealand have been examined to determine the Daleoceanographic history of the late Quaternary in the SW Pacific using planktonic foraminiferal data. Distinct shifts of species carl be seen between glacial and interglacial times especially south of Chatham Rise east of South Island. Foraminiferal fragmentation ratios and benthic/planktonic foraminiferal ratios both show increased dissolution during glacials, especially isotope stage 2 to the south of Chatham Rise. The present-day Subtropical Convergence appears to be tied to the Chatham Rise at 44 degrees S, but during glacial times this rise separated cold water to the south from much warmer water to the north, with an associated strong thermal gradient across the rise; We estimate that this gradient could have presented as much as an 8 degrees C temperature change across 4 degrees of latitude during the maximum of the last ice age, There is only weak evidence of the: Younger Dryas cool event, but there is a clear climatic optimum between 8 and 6.4 ka with temperatures 1 degrees-2 degrees C higher than the present day. The marine changes compare well with vegetational changes on both South and North Island.
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页码:70 / 83
页数:14
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