Australasian monsoon response to Dansgaard-Oeschger event 21 and teleconnections to higher latitudes
Dansgaard-Oeschger (D-O) cycles were the most prominent, abrupt climate events of the last glacial period whose impact was most strongly felt in the high latitudes of the North Atlantic region. The climate links between the North Atlantic, the Asian and American tropics, and Antarctica during these...
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ftunivqespace:oai:espace.library.uq.edu.au:UQ:730253 2023-05-15T13:34:43+02:00 Australasian monsoon response to Dansgaard-Oeschger event 21 and teleconnections to higher latitudes Griffiths, Michael L. Drysdale, Russell N. Gagan, Michael K. Hellstrom, John C. Couchoud, Isabelle Ayliffe, Linda K. Vonhof, Hubert B. Hantoro, Wahyoe S. 2013-05-01 https://espace.library.uq.edu.au/view/UQ:730253 eng eng Elsevier BV doi:10.1016/j.epsl.2013.03.030 issn:0012-821X issn:1385-013X orcid:0000-0002-8279-323X Dansgaard-Oeschger event 21 Indonesia Monsoon Speleothem Teleconnections 1901 Earth and Planetary Sciences (miscellaneous) 1906 Geochemistry and Petrology 1908 Geophysics 1912 Space and Planetary Science Journal Article 2013 ftunivqespace https://doi.org/10.1016/j.epsl.2013.03.030 2020-08-06T08:38:38Z Dansgaard-Oeschger (D-O) cycles were the most prominent, abrupt climate events of the last glacial period whose impact was most strongly felt in the high latitudes of the North Atlantic region. The climate links between the North Atlantic, the Asian and American tropics, and Antarctica during these cycles are well documented. However, the potential role of the Indo-Pacific Warm Pool and Australasian monsoon system in propagating climate impacts across the hemispheres is still unclear. Here, we use tandem measurements of oxygen isotopes in calcite and fluid inclusions, as well as carbon-isotope ratios, from multiple stalagmites from Liang Luar Cave, Flores (southern Indonesia) to examine the monsoon response to D-O event number 21 (~87,000-84,000 years ago), the longest and warmest event recorded in Greenland ice cores. The record shows that there was a rapid decline in monsoon rainfall in Indonesia during D-O21 warming in Greenland and cooling in Antarctica. At around the same time, the East Asian monsoon was intensified, indicating that the intertropical convergence zone (ITCZ) shifted abruptly to the north during this event. Our record also shows that there was a 2-3°C increase in local air temperature, which would have acted to increase primary productivity and promote the generation of soil carbon for methanogenesis. Therefore, our findings indicate that ITCZ positioning in tropical Australasia-through its influence on large-scale oceanic-atmospheric circulation-played a key role in transmitting the abrupt climate signal between the hemispheres, thereby facilitating the rapid rise of atmospheric CO and CH concentrations during D-O21 that ultimately led to global warming and the demise of the MIS5b stadial. Article in Journal/Newspaper Antarc* Antarctica Greenland Greenland ice cores North Atlantic The University of Queensland: UQ eSpace Greenland Pacific Earth and Planetary Science Letters 369-370 294 304 |
institution |
Open Polar |
collection |
The University of Queensland: UQ eSpace |
op_collection_id |
ftunivqespace |
language |
English |
topic |
Dansgaard-Oeschger event 21 Indonesia Monsoon Speleothem Teleconnections 1901 Earth and Planetary Sciences (miscellaneous) 1906 Geochemistry and Petrology 1908 Geophysics 1912 Space and Planetary Science |
spellingShingle |
Dansgaard-Oeschger event 21 Indonesia Monsoon Speleothem Teleconnections 1901 Earth and Planetary Sciences (miscellaneous) 1906 Geochemistry and Petrology 1908 Geophysics 1912 Space and Planetary Science Griffiths, Michael L. Drysdale, Russell N. Gagan, Michael K. Hellstrom, John C. Couchoud, Isabelle Ayliffe, Linda K. Vonhof, Hubert B. Hantoro, Wahyoe S. Australasian monsoon response to Dansgaard-Oeschger event 21 and teleconnections to higher latitudes |
topic_facet |
Dansgaard-Oeschger event 21 Indonesia Monsoon Speleothem Teleconnections 1901 Earth and Planetary Sciences (miscellaneous) 1906 Geochemistry and Petrology 1908 Geophysics 1912 Space and Planetary Science |
description |
Dansgaard-Oeschger (D-O) cycles were the most prominent, abrupt climate events of the last glacial period whose impact was most strongly felt in the high latitudes of the North Atlantic region. The climate links between the North Atlantic, the Asian and American tropics, and Antarctica during these cycles are well documented. However, the potential role of the Indo-Pacific Warm Pool and Australasian monsoon system in propagating climate impacts across the hemispheres is still unclear. Here, we use tandem measurements of oxygen isotopes in calcite and fluid inclusions, as well as carbon-isotope ratios, from multiple stalagmites from Liang Luar Cave, Flores (southern Indonesia) to examine the monsoon response to D-O event number 21 (~87,000-84,000 years ago), the longest and warmest event recorded in Greenland ice cores. The record shows that there was a rapid decline in monsoon rainfall in Indonesia during D-O21 warming in Greenland and cooling in Antarctica. At around the same time, the East Asian monsoon was intensified, indicating that the intertropical convergence zone (ITCZ) shifted abruptly to the north during this event. Our record also shows that there was a 2-3°C increase in local air temperature, which would have acted to increase primary productivity and promote the generation of soil carbon for methanogenesis. Therefore, our findings indicate that ITCZ positioning in tropical Australasia-through its influence on large-scale oceanic-atmospheric circulation-played a key role in transmitting the abrupt climate signal between the hemispheres, thereby facilitating the rapid rise of atmospheric CO and CH concentrations during D-O21 that ultimately led to global warming and the demise of the MIS5b stadial. |
format |
Article in Journal/Newspaper |
author |
Griffiths, Michael L. Drysdale, Russell N. Gagan, Michael K. Hellstrom, John C. Couchoud, Isabelle Ayliffe, Linda K. Vonhof, Hubert B. Hantoro, Wahyoe S. |
author_facet |
Griffiths, Michael L. Drysdale, Russell N. Gagan, Michael K. Hellstrom, John C. Couchoud, Isabelle Ayliffe, Linda K. Vonhof, Hubert B. Hantoro, Wahyoe S. |
author_sort |
Griffiths, Michael L. |
title |
Australasian monsoon response to Dansgaard-Oeschger event 21 and teleconnections to higher latitudes |
title_short |
Australasian monsoon response to Dansgaard-Oeschger event 21 and teleconnections to higher latitudes |
title_full |
Australasian monsoon response to Dansgaard-Oeschger event 21 and teleconnections to higher latitudes |
title_fullStr |
Australasian monsoon response to Dansgaard-Oeschger event 21 and teleconnections to higher latitudes |
title_full_unstemmed |
Australasian monsoon response to Dansgaard-Oeschger event 21 and teleconnections to higher latitudes |
title_sort |
australasian monsoon response to dansgaard-oeschger event 21 and teleconnections to higher latitudes |
publisher |
Elsevier BV |
publishDate |
2013 |
url |
https://espace.library.uq.edu.au/view/UQ:730253 |
geographic |
Greenland Pacific |
geographic_facet |
Greenland Pacific |
genre |
Antarc* Antarctica Greenland Greenland ice cores North Atlantic |
genre_facet |
Antarc* Antarctica Greenland Greenland ice cores North Atlantic |
op_relation |
doi:10.1016/j.epsl.2013.03.030 issn:0012-821X issn:1385-013X orcid:0000-0002-8279-323X |
op_doi |
https://doi.org/10.1016/j.epsl.2013.03.030 |
container_title |
Earth and Planetary Science Letters |
container_volume |
369-370 |
container_start_page |
294 |
op_container_end_page |
304 |
_version_ |
1766056541313564672 |