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 14 C time scale beyond 30 ka (kilo annum). Improved analytical procedures, and quantitative criteria for sample selection, helped di...
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Online Access: | http://dx.doi.org/10.1017/s0033822200030320 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0033822200030320 |
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crcambridgeupr:10.1017/s0033822200030320 2024-03-03T08:47:00+00:00 Last Ice Age Millennial Scale Climate Changes Recorded in Huon Peninsula Corals Yokoyama, Yusuke Esat, Tezer M Lambeck, Kurt Keith Fifield, L 2000 http://dx.doi.org/10.1017/s0033822200030320 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0033822200030320 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Radiocarbon volume 42, issue 3, page 383-401 ISSN 0033-8222 1945-5755 General Earth and Planetary Sciences Archeology journal-article 2000 crcambridgeupr https://doi.org/10.1017/s0033822200030320 2024-02-08T08:34:57Z 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 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 14 C excess imply the following sequence of events: An initial sea-level high is followed by a large increase in atmospheric 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 14 C levels are attributed to the cessation of the North Atlantic circulation. Article in Journal/Newspaper North Atlantic North atlantic Thermohaline circulation Cambridge University Press Huon ENVELOPE(-57.998,-57.998,-63.367,-63.367) Radiocarbon 42 3 383 401 |
institution |
Open Polar |
collection |
Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
topic |
General Earth and Planetary Sciences Archeology |
spellingShingle |
General Earth and Planetary Sciences Archeology Yokoyama, Yusuke Esat, Tezer M Lambeck, Kurt Keith Fifield, L Last Ice Age Millennial Scale Climate Changes Recorded in Huon Peninsula Corals |
topic_facet |
General Earth and Planetary Sciences Archeology |
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 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 14 C excess imply the following sequence of events: An initial sea-level high is followed by a large increase in atmospheric 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 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 Keith Fifield, L |
author_facet |
Yokoyama, Yusuke Esat, Tezer M Lambeck, Kurt Keith Fifield, L |
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 |
Cambridge University Press (CUP) |
publishDate |
2000 |
url |
http://dx.doi.org/10.1017/s0033822200030320 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0033822200030320 |
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 volume 42, issue 3, page 383-401 ISSN 0033-8222 1945-5755 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1017/s0033822200030320 |
container_title |
Radiocarbon |
container_volume |
42 |
container_issue |
3 |
container_start_page |
383 |
op_container_end_page |
401 |
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1792503129776848896 |