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Last Ice Age Millennial Scale Climate Changes Recorded in Huon Peninsula Corals

Published online by Cambridge University Press:  18 July 2016

Yusuke Yokoyama ,
Tezer M Esat ,
Kurt Lambeck  and
L Keith Fifield
Yusuke Yokoyama
Affiliation:
Research School of Earth Sciences, The Australian National University, Canberra, ACT 0200, Australia
Tezer M Esat
Affiliation:
Research School of Earth Sciences, The Australian National University, Canberra, ACT 0200, Australia Department of Geology, The Australian National University, Canberra, ACT 0200, Australia
Kurt Lambeck
Affiliation:
Research School of Earth Sciences, The Australian National University, Canberra, ACT 0200, Australia
L Keith Fifield
Affiliation:
Department of Nuclear Physics, Research School of Physical Sciences and Engineering, The Australian National University, Canberra, ACT 0200, Australia
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Abstract

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Uranium series and radiocarbon ages were measured in corals from the uplifted coral terraces of Huon Peninsula (HP), Papua New Guinea, to provide a calibration for the 14C time scale beyond 30 ka (kilo annum). Improved analytical procedures, and quantitative criteria for sample selection, helped discriminate diagenetically altered samples. The base-line of the calibration curve follows the trend of increasing divergence from calendar ages, as established by previous studies. Superimposed on this trend, four well-defined peaks of excess atmospheric radiocarbon were found ranging in magnitude from 100% to 700%, relative to current levels. They are related to episodes of sea-level rise and reef growth at HP. These peaks appear to be synchronous with Heinrich Events and concentrations of ice-rafted debris found in North Atlantic deep-sea cores. Relative timing of sea-level rise and atmospheric 14C excess imply the following sequence of events: An initial sea-level high is followed by a large increase in atmospheric 14C as the sea-level subsides. Over about 1800 years, the atmospheric radiocarbon drops to below present ambient levels. This cycle bears a close resemblance to ice-calving episodes of Dansgaard-Oeschger and Bond cycles and the slow-down or complete interruption of the North Atlantic thermohaline circulation. The increases in the atmospheric 14C levels are attributed to the cessation of the North Atlantic circulation.

Type
Comparison Records
Information
Radiocarbon , Volume 42 , Issue 3 , 2000 , pp. 383 - 401
Copyright
Copyright © 2000 The Arizona Board of Regents on behalf of the University of Arizona 

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