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

摘要: A series of cores from east New Zealand have been examined to determine the paleoceanographic history late Quaternary in SW Pacific using planktonic foraminiferal data. Distinct shifts species can be seen between glacial and interglacial times especially south Chatham Rise South Island. Foraminiferal fragmentation ratios benthic/planktonic both show increased dissolution during glacials, isotope stage 2 Rise. The present-day Subtropical Convergence appears tied at 44°S, but this rise separated cold water much warmer north, with an associated strong thermal gradient across rise. We estimate that could presented as 8°C temperature change 4° latitude maximum last ice age. There is only weak evidence Younger Dryas cool event, there a clear climatic optimum 8 6.4 ka temperatures 1°–2°C higher than present day. marine changes compare well vegetational on North