Last Ice Age Millennial Scale Climate Changes Recorded in Huon Peninsula Corals
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 dis...
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ftanucanberra:oai:digitalcollections.anu.edu.au:1885/90885 2023-05-15T17:29:13+02:00 Last Ice Age Millennial Scale Climate Changes Recorded in Huon Peninsula Corals Yokoyama, Yusuke Esat, Tezer Lambeck, Kurt Fifield, L Keith 2015-12-13T23:20:49Z http://hdl.handle.net/1885/90885 unknown University of Arizona 0033-8222 http://hdl.handle.net/1885/90885 Radiocarbon Keywords: carbon 14 coral ice sea water uranium paleoclimate radiocarbon dating uranium series dating age determination article atmospheric diffusion calibration nonhuman Papua New Guinea sea Journal article 2015 ftanucanberra 2015-12-21T23:57:54Z 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. Article in Journal/Newspaper North Atlantic North atlantic Thermohaline circulation Australian National University: ANU Digital Collections Huon ENVELOPE(-57.998,-57.998,-63.367,-63.367) |
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Australian National University: ANU Digital Collections |
op_collection_id |
ftanucanberra |
language |
unknown |
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Keywords: carbon 14 coral ice sea water uranium paleoclimate radiocarbon dating uranium series dating age determination article atmospheric diffusion calibration nonhuman Papua New Guinea sea |
spellingShingle |
Keywords: carbon 14 coral ice sea water uranium paleoclimate radiocarbon dating uranium series dating age determination article atmospheric diffusion calibration nonhuman Papua New Guinea sea Yokoyama, Yusuke Esat, Tezer Lambeck, Kurt Fifield, L Keith Last Ice Age Millennial Scale Climate Changes Recorded in Huon Peninsula Corals |
topic_facet |
Keywords: carbon 14 coral ice sea water uranium paleoclimate radiocarbon dating uranium series dating age determination article atmospheric diffusion calibration nonhuman Papua New Guinea sea |
description |
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. |
format |
Article in Journal/Newspaper |
author |
Yokoyama, Yusuke Esat, Tezer Lambeck, Kurt Fifield, L Keith |
author_facet |
Yokoyama, Yusuke Esat, Tezer Lambeck, Kurt Fifield, L Keith |
author_sort |
Yokoyama, Yusuke |
title |
Last Ice Age Millennial Scale Climate Changes Recorded in Huon Peninsula Corals |
title_short |
Last Ice Age Millennial Scale Climate Changes Recorded in Huon Peninsula Corals |
title_full |
Last Ice Age Millennial Scale Climate Changes Recorded in Huon Peninsula Corals |
title_fullStr |
Last Ice Age Millennial Scale Climate Changes Recorded in Huon Peninsula Corals |
title_full_unstemmed |
Last Ice Age Millennial Scale Climate Changes Recorded in Huon Peninsula Corals |
title_sort |
last ice age millennial scale climate changes recorded in huon peninsula corals |
publisher |
University of Arizona |
publishDate |
2015 |
url |
http://hdl.handle.net/1885/90885 |
long_lat |
ENVELOPE(-57.998,-57.998,-63.367,-63.367) |
geographic |
Huon |
geographic_facet |
Huon |
genre |
North Atlantic North atlantic Thermohaline circulation |
genre_facet |
North Atlantic North atlantic Thermohaline circulation |
op_source |
Radiocarbon |
op_relation |
0033-8222 http://hdl.handle.net/1885/90885 |
_version_ |
1766122869827305472 |