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 (super 14) C time scale beyond 30 ka (kilo annum). Improved analytical procedures, and quantitative criteria for sample selection, h...
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ftunivarizonaojs:oai:journals.uair.arizona.edu:article/3830 2023-05-15T17:28:36+02:00 Last Ice Age millennial scale climate changes recorded in Huon Peninsula corals. Yokoyama, Yusuke Esat, Tezer M Lambeck, Kurt Fifield, L Keith 2000-01-01 application/pdf https://journals.uair.arizona.edu/index.php/radiocarbon/article/view/3830 eng eng Radiocarbon https://journals.uair.arizona.edu/index.php/radiocarbon/article/view/3830/3255 https://journals.uair.arizona.edu/index.php/radiocarbon/article/view/3830 Radiocarbon; Vol 42, No 3 (2000); 383-401 0033-8222 Huon Peninsula;Papua;Heinrich events;Dansgaard Oeschger cycles;Papua New Guinea;terraces;reefs;sea level changes;Th U;climate change;Atlantic Ocean;North Atlantic;calibration;atmosphere;Australasia;last glacial maximum;Pleistocene;upper Pleistocene;Cenozoic;Quaternary;C 14;carbon;isotopes;radioactive isotopes;absolute age info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Peer-reviewed Article 2000 ftunivarizonaojs 2020-11-14T16:10:02Z 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 (super 14) C 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 (super 14) C excess imply the following sequence of events: An initial sea-level high is followed by a large increase in atmospheric (super 14) C 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 (super 14) C levels are attributed to the cessation of the North Atlantic circulation. Article in Journal/Newspaper North Atlantic North atlantic Thermohaline circulation Journals at the University of Arizona Huon ENVELOPE(-57.998,-57.998,-63.367,-63.367) |
institution |
Open Polar |
collection |
Journals at the University of Arizona |
op_collection_id |
ftunivarizonaojs |
language |
English |
topic |
Huon Peninsula;Papua;Heinrich events;Dansgaard Oeschger cycles;Papua New Guinea;terraces;reefs;sea level changes;Th U;climate change;Atlantic Ocean;North Atlantic;calibration;atmosphere;Australasia;last glacial maximum;Pleistocene;upper Pleistocene;Cenozoic;Quaternary;C 14;carbon;isotopes;radioactive isotopes;absolute age |
spellingShingle |
Huon Peninsula;Papua;Heinrich events;Dansgaard Oeschger cycles;Papua New Guinea;terraces;reefs;sea level changes;Th U;climate change;Atlantic Ocean;North Atlantic;calibration;atmosphere;Australasia;last glacial maximum;Pleistocene;upper Pleistocene;Cenozoic;Quaternary;C 14;carbon;isotopes;radioactive isotopes;absolute age Yokoyama, Yusuke Esat, Tezer M Lambeck, Kurt Fifield, L Keith Last Ice Age millennial scale climate changes recorded in Huon Peninsula corals. |
topic_facet |
Huon Peninsula;Papua;Heinrich events;Dansgaard Oeschger cycles;Papua New Guinea;terraces;reefs;sea level changes;Th U;climate change;Atlantic Ocean;North Atlantic;calibration;atmosphere;Australasia;last glacial maximum;Pleistocene;upper Pleistocene;Cenozoic;Quaternary;C 14;carbon;isotopes;radioactive isotopes;absolute age |
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 (super 14) C 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 (super 14) C excess imply the following sequence of events: An initial sea-level high is followed by a large increase in atmospheric (super 14) C 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 (super 14) C levels are attributed to the cessation of the North Atlantic circulation. |
format |
Article in Journal/Newspaper |
author |
Yokoyama, Yusuke Esat, Tezer M Lambeck, Kurt Fifield, L Keith |
author_facet |
Yokoyama, Yusuke Esat, Tezer M 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 |
Radiocarbon |
publishDate |
2000 |
url |
https://journals.uair.arizona.edu/index.php/radiocarbon/article/view/3830 |
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; Vol 42, No 3 (2000); 383-401 0033-8222 |
op_relation |
https://journals.uair.arizona.edu/index.php/radiocarbon/article/view/3830/3255 https://journals.uair.arizona.edu/index.php/radiocarbon/article/view/3830 |
_version_ |
1766121365954363392 |