Inter-hemispheric linkages in climate change: paleo-perspectives for future climate change
The Pole-Equator-Pole (PEP) projects of the PANASH (Paleoclimates of the Northern and Southern Hemisphere) programme have significantly advanced our understanding of past climate change on a global basis and helped to integrate paleo-science across regions and research disciplines. PANASH science al...
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ftanucanberra:oai:openresearch-repository.anu.edu.au:1885/22882 2024-01-14T10:02:21+01:00 Inter-hemispheric linkages in climate change: paleo-perspectives for future climate change Shulmeister, J Rodbell, D.T. Gagan, Michael Seltzer, G O http://hdl.handle.net/1885/22882 https://openresearch-repository.anu.edu.au/bitstream/1885/22882/5/Pub-43.Shulmeister_Climatpast_2006.pdf.jpg https://openresearch-repository.anu.edu.au/bitstream/1885/22882/7/01_Shulmeister_Inter-hemispheric_linkages_in_2006.pdf.jpg unknown Copernicus GmbH 1814-9324 http://hdl.handle.net/1885/22882 https://openresearch-repository.anu.edu.au/bitstream/1885/22882/5/Pub-43.Shulmeister_Climatpast_2006.pdf.jpg https://openresearch-repository.anu.edu.au/bitstream/1885/22882/7/01_Shulmeister_Inter-hemispheric_linkages_in_2006.pdf.jpg Climate of the Past Keywords: climate change climate oscillation deglaciation El Nino-Southern Oscillation glaciation Holocene ice sheet Northern Hemisphere Southern Hemisphere teleconnection Andes Antarctica South America Journal article ftanucanberra 2023-12-15T09:34:19Z The Pole-Equator-Pole (PEP) projects of the PANASH (Paleoclimates of the Northern and Southern Hemisphere) programme have significantly advanced our understanding of past climate change on a global basis and helped to integrate paleo-science across regions and research disciplines. PANASH science allows us to constrain predictions for future climate change and to contribute to the management of consequent environmental changes. We identify three broad areas where PEP science makes key contributions. 1. The pattern of global changes. Knowing the exact timing of glacial advances (synchronous or otherwise) during the last glaciation is critical to understanding interhemispheric links in climate. Work in PEPI demonstrated that the tropical Andes in South America were deglaciated earlier than the Northern Hemisphere (NH) and that an extended warming began there ca. 21 000 cal years BP. The general pattern is consistent with Antarctica and has now been replicated from studies in Southern Hemisphere (SH) regions of the PEPII transect. That significant deglaciation of SH alpine systems and Antarctica led deglaciation of NH ice sheets may reflect either i) faster response times in alpine systems and Antarctica, ii) regional moisture patterns that influenced glacier mass balance, or iii) a SH temperature forcing that led changes in the NH. This highlights the limitations of current understanding and the need for further fundamental paleoclimate research. 2. Changes in modes of operation of oscillatory climate systems. Work across all the PEP transects has led to the recognition that the El Niño Southern Oscillation (ENSO) phenomenon has changed markedly through time. It now appears that ENSO operated during the last glacial termination and during the early Holocene, but that precipitation teleconnections even within the Pacific Basin were turned down, or off. In the modern ENSO phenomenon both inter-annual and seven year periodicities are present, with the inter-annual signal dominant. Paleo-data demonstrate that the ... Article in Journal/Newspaper Antarc* Antarctica Ice Sheet Australian National University: ANU Digital Collections Pacific |
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Open Polar |
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Australian National University: ANU Digital Collections |
op_collection_id |
ftanucanberra |
language |
unknown |
topic |
Keywords: climate change climate oscillation deglaciation El Nino-Southern Oscillation glaciation Holocene ice sheet Northern Hemisphere Southern Hemisphere teleconnection Andes Antarctica South America |
spellingShingle |
Keywords: climate change climate oscillation deglaciation El Nino-Southern Oscillation glaciation Holocene ice sheet Northern Hemisphere Southern Hemisphere teleconnection Andes Antarctica South America Shulmeister, J Rodbell, D.T. Gagan, Michael Seltzer, G O Inter-hemispheric linkages in climate change: paleo-perspectives for future climate change |
topic_facet |
Keywords: climate change climate oscillation deglaciation El Nino-Southern Oscillation glaciation Holocene ice sheet Northern Hemisphere Southern Hemisphere teleconnection Andes Antarctica South America |
description |
The Pole-Equator-Pole (PEP) projects of the PANASH (Paleoclimates of the Northern and Southern Hemisphere) programme have significantly advanced our understanding of past climate change on a global basis and helped to integrate paleo-science across regions and research disciplines. PANASH science allows us to constrain predictions for future climate change and to contribute to the management of consequent environmental changes. We identify three broad areas where PEP science makes key contributions. 1. The pattern of global changes. Knowing the exact timing of glacial advances (synchronous or otherwise) during the last glaciation is critical to understanding interhemispheric links in climate. Work in PEPI demonstrated that the tropical Andes in South America were deglaciated earlier than the Northern Hemisphere (NH) and that an extended warming began there ca. 21 000 cal years BP. The general pattern is consistent with Antarctica and has now been replicated from studies in Southern Hemisphere (SH) regions of the PEPII transect. That significant deglaciation of SH alpine systems and Antarctica led deglaciation of NH ice sheets may reflect either i) faster response times in alpine systems and Antarctica, ii) regional moisture patterns that influenced glacier mass balance, or iii) a SH temperature forcing that led changes in the NH. This highlights the limitations of current understanding and the need for further fundamental paleoclimate research. 2. Changes in modes of operation of oscillatory climate systems. Work across all the PEP transects has led to the recognition that the El Niño Southern Oscillation (ENSO) phenomenon has changed markedly through time. It now appears that ENSO operated during the last glacial termination and during the early Holocene, but that precipitation teleconnections even within the Pacific Basin were turned down, or off. In the modern ENSO phenomenon both inter-annual and seven year periodicities are present, with the inter-annual signal dominant. Paleo-data demonstrate that the ... |
format |
Article in Journal/Newspaper |
author |
Shulmeister, J Rodbell, D.T. Gagan, Michael Seltzer, G O |
author_facet |
Shulmeister, J Rodbell, D.T. Gagan, Michael Seltzer, G O |
author_sort |
Shulmeister, J |
title |
Inter-hemispheric linkages in climate change: paleo-perspectives for future climate change |
title_short |
Inter-hemispheric linkages in climate change: paleo-perspectives for future climate change |
title_full |
Inter-hemispheric linkages in climate change: paleo-perspectives for future climate change |
title_fullStr |
Inter-hemispheric linkages in climate change: paleo-perspectives for future climate change |
title_full_unstemmed |
Inter-hemispheric linkages in climate change: paleo-perspectives for future climate change |
title_sort |
inter-hemispheric linkages in climate change: paleo-perspectives for future climate change |
publisher |
Copernicus GmbH |
url |
http://hdl.handle.net/1885/22882 https://openresearch-repository.anu.edu.au/bitstream/1885/22882/5/Pub-43.Shulmeister_Climatpast_2006.pdf.jpg https://openresearch-repository.anu.edu.au/bitstream/1885/22882/7/01_Shulmeister_Inter-hemispheric_linkages_in_2006.pdf.jpg |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
Antarc* Antarctica Ice Sheet |
genre_facet |
Antarc* Antarctica Ice Sheet |
op_source |
Climate of the Past |
op_relation |
1814-9324 http://hdl.handle.net/1885/22882 https://openresearch-repository.anu.edu.au/bitstream/1885/22882/5/Pub-43.Shulmeister_Climatpast_2006.pdf.jpg https://openresearch-repository.anu.edu.au/bitstream/1885/22882/7/01_Shulmeister_Inter-hemispheric_linkages_in_2006.pdf.jpg |
_version_ |
1788057339094368256 |