Late-glacial glacier events in southernmost South America: A blend of 'northern'and 'southern' hemispheric climatic signals?
This paper examines new geomorphological, chronological and modelling data on glacier fluctuations in southernmost South America in latitudes 46–55°S during the last glacial–interglacial transition. Establishing leads and lags between the northern and southern hemispheres and between southern mid-la...
Published in: | Geografiska Annaler: Series A, Physical Geography |
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Main Authors: | , , , , , |
Other Authors: | , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Wiley-Blackwell
2005
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Subjects: | |
Online Access: | http://hdl.handle.net/1893/16848 https://doi.org/10.1111/j.0435-3676.2005.00259.x http://dspace.stir.ac.uk/bitstream/1893/16848/1/Sugden%20et%20al%20273.pdf |
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ftunivstirling:oai:dspace.stir.ac.uk:1893/16848 |
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record_format |
openpolar |
institution |
Open Polar |
collection |
University of Stirling: Stirling Digital Research Repository |
op_collection_id |
ftunivstirling |
language |
English |
topic |
Patagonia glacier fluctuations Last Glacial Maximum Antarctic Cold Reversal late glacial bipolar seesaw Antarctic circumpolar wave Climatic changes Glaciology |
spellingShingle |
Patagonia glacier fluctuations Last Glacial Maximum Antarctic Cold Reversal late glacial bipolar seesaw Antarctic circumpolar wave Climatic changes Glaciology Sugden, David E Bentley, Michael J Fogwill, Chris Hulton, Nicholas R J McCulloch, Robert Purves, Ross Late-glacial glacier events in southernmost South America: A blend of 'northern'and 'southern' hemispheric climatic signals? |
topic_facet |
Patagonia glacier fluctuations Last Glacial Maximum Antarctic Cold Reversal late glacial bipolar seesaw Antarctic circumpolar wave Climatic changes Glaciology |
description |
This paper examines new geomorphological, chronological and modelling data on glacier fluctuations in southernmost South America in latitudes 46–55°S during the last glacial–interglacial transition. Establishing leads and lags between the northern and southern hemispheres and between southern mid-latitudes and Antarctica is key to an appreciation of the mechanisms and resilience of global climate. This is particularly important in the southern hemisphere where there is a paucity of empirical data. The overall structure of the last glacial cycle in Patagonia has a northern hemisphere signal. Glaciers reached or approached their Last Glacial Maxima on two or more occasions at 25–23 ka (calendar) and there was a third less extensive advance at 17.5 ka. Deglaciation occurred in two steps at 17.5 ka and at 11.4 ka. This structure is the same as that recognized in the northern hemisphere and taking place in spite of glacier advances occurring at a time of high southern hemisphere summer insolation and deglaciation at a time of decreasing summer insolation. The implication is that at orbital time scales the ‘northern’ signal dominates any southern hemisphere signal. During deglaciation, at a millennial scale, the glacier fluctuations mirror an antiphase ‘southern’ climatic signal as revealed in Antarctic ice cores. There is a glacier advance coincident with the Antarctic Cold Reversal at 15.3– 12.2 ka. Furthermore, deglaciation begins in the middle of the Younger Dryas. The implication is that, during the last glacial–interglacial transition, southernmost South America was under the influence of sea surface temperatures, sea ice and southern westerlies responding to conditions in the ‘southern’ Antarctic domain. Such asynchrony may reflect a situation whereby, during deglaciation, the world is more sensitized to fluctuations in the oceanic thermohaline circulation, perhaps related to the bipolar seesaw, than at orbital timescales. |
author2 |
University of Edinburgh Durham University University of Sydney Biological and Environmental Sciences ETH Zurich orcid:0000-0001-5542-3703 |
format |
Article in Journal/Newspaper |
author |
Sugden, David E Bentley, Michael J Fogwill, Chris Hulton, Nicholas R J McCulloch, Robert Purves, Ross |
author_facet |
Sugden, David E Bentley, Michael J Fogwill, Chris Hulton, Nicholas R J McCulloch, Robert Purves, Ross |
author_sort |
Sugden, David E |
title |
Late-glacial glacier events in southernmost South America: A blend of 'northern'and 'southern' hemispheric climatic signals? |
title_short |
Late-glacial glacier events in southernmost South America: A blend of 'northern'and 'southern' hemispheric climatic signals? |
title_full |
Late-glacial glacier events in southernmost South America: A blend of 'northern'and 'southern' hemispheric climatic signals? |
title_fullStr |
Late-glacial glacier events in southernmost South America: A blend of 'northern'and 'southern' hemispheric climatic signals? |
title_full_unstemmed |
Late-glacial glacier events in southernmost South America: A blend of 'northern'and 'southern' hemispheric climatic signals? |
title_sort |
late-glacial glacier events in southernmost south america: a blend of 'northern'and 'southern' hemispheric climatic signals? |
publisher |
Wiley-Blackwell |
publishDate |
2005 |
url |
http://hdl.handle.net/1893/16848 https://doi.org/10.1111/j.0435-3676.2005.00259.x http://dspace.stir.ac.uk/bitstream/1893/16848/1/Sugden%20et%20al%20273.pdf |
geographic |
Antarctic Patagonia The Antarctic |
geographic_facet |
Antarctic Patagonia The Antarctic |
genre |
Antarc* Antarctic Antarctica Sea ice |
genre_facet |
Antarc* Antarctic Antarctica Sea ice |
op_relation |
Sugden DE, Bentley MJ, Fogwill C, Hulton NRJ, McCulloch R & Purves R (2005) Late-glacial glacier events in southernmost South America: A blend of 'northern'and 'southern' hemispheric climatic signals?. Geografiska Annaler: Series A, Physical Geography, 87 (2), pp. 273-288. https://doi.org/10.1111/j.0435-3676.2005.00259.x http://hdl.handle.net/1893/16848 doi:10.1111/j.0435-3676.2005.00259.x WOS:000230361200002 2-s2.0-21344448177 716499 http://dspace.stir.ac.uk/bitstream/1893/16848/1/Sugden%20et%20al%20273.pdf |
op_rights |
The publisher does not allow this work to be made publicly available in this Repository. Please use the Request a Copy feature at the foot of the Repository record to request a copy directly from the author. You can only request a copy if you wish to use this work for your own research or private study. http://www.rioxx.net/licenses/under-embargo-all-rights-reserved 2999-12-31 [Sugden et al 273.pdf] The publisher does not allow this work to be made publicly available in this Repository therefore there is an embargo on the full text of the work. |
op_doi |
https://doi.org/10.1111/j.0435-3676.2005.00259.x |
container_title |
Geografiska Annaler: Series A, Physical Geography |
container_volume |
87 |
container_issue |
2 |
container_start_page |
273 |
op_container_end_page |
288 |
_version_ |
1766277172481228800 |
spelling |
ftunivstirling:oai:dspace.stir.ac.uk:1893/16848 2023-05-15T14:05:21+02:00 Late-glacial glacier events in southernmost South America: A blend of 'northern'and 'southern' hemispheric climatic signals? Sugden, David E Bentley, Michael J Fogwill, Chris Hulton, Nicholas R J McCulloch, Robert Purves, Ross University of Edinburgh Durham University University of Sydney Biological and Environmental Sciences ETH Zurich orcid:0000-0001-5542-3703 2005-06 application/pdf http://hdl.handle.net/1893/16848 https://doi.org/10.1111/j.0435-3676.2005.00259.x http://dspace.stir.ac.uk/bitstream/1893/16848/1/Sugden%20et%20al%20273.pdf en eng Wiley-Blackwell Sugden DE, Bentley MJ, Fogwill C, Hulton NRJ, McCulloch R & Purves R (2005) Late-glacial glacier events in southernmost South America: A blend of 'northern'and 'southern' hemispheric climatic signals?. Geografiska Annaler: Series A, Physical Geography, 87 (2), pp. 273-288. https://doi.org/10.1111/j.0435-3676.2005.00259.x http://hdl.handle.net/1893/16848 doi:10.1111/j.0435-3676.2005.00259.x WOS:000230361200002 2-s2.0-21344448177 716499 http://dspace.stir.ac.uk/bitstream/1893/16848/1/Sugden%20et%20al%20273.pdf The publisher does not allow this work to be made publicly available in this Repository. Please use the Request a Copy feature at the foot of the Repository record to request a copy directly from the author. You can only request a copy if you wish to use this work for your own research or private study. http://www.rioxx.net/licenses/under-embargo-all-rights-reserved 2999-12-31 [Sugden et al 273.pdf] The publisher does not allow this work to be made publicly available in this Repository therefore there is an embargo on the full text of the work. Patagonia glacier fluctuations Last Glacial Maximum Antarctic Cold Reversal late glacial bipolar seesaw Antarctic circumpolar wave Climatic changes Glaciology Journal Article VoR - Version of Record 2005 ftunivstirling https://doi.org/10.1111/j.0435-3676.2005.00259.x 2022-06-13T18:41:58Z This paper examines new geomorphological, chronological and modelling data on glacier fluctuations in southernmost South America in latitudes 46–55°S during the last glacial–interglacial transition. Establishing leads and lags between the northern and southern hemispheres and between southern mid-latitudes and Antarctica is key to an appreciation of the mechanisms and resilience of global climate. This is particularly important in the southern hemisphere where there is a paucity of empirical data. The overall structure of the last glacial cycle in Patagonia has a northern hemisphere signal. Glaciers reached or approached their Last Glacial Maxima on two or more occasions at 25–23 ka (calendar) and there was a third less extensive advance at 17.5 ka. Deglaciation occurred in two steps at 17.5 ka and at 11.4 ka. This structure is the same as that recognized in the northern hemisphere and taking place in spite of glacier advances occurring at a time of high southern hemisphere summer insolation and deglaciation at a time of decreasing summer insolation. The implication is that at orbital time scales the ‘northern’ signal dominates any southern hemisphere signal. During deglaciation, at a millennial scale, the glacier fluctuations mirror an antiphase ‘southern’ climatic signal as revealed in Antarctic ice cores. There is a glacier advance coincident with the Antarctic Cold Reversal at 15.3– 12.2 ka. Furthermore, deglaciation begins in the middle of the Younger Dryas. The implication is that, during the last glacial–interglacial transition, southernmost South America was under the influence of sea surface temperatures, sea ice and southern westerlies responding to conditions in the ‘southern’ Antarctic domain. Such asynchrony may reflect a situation whereby, during deglaciation, the world is more sensitized to fluctuations in the oceanic thermohaline circulation, perhaps related to the bipolar seesaw, than at orbital timescales. Article in Journal/Newspaper Antarc* Antarctic Antarctica Sea ice University of Stirling: Stirling Digital Research Repository Antarctic Patagonia The Antarctic Geografiska Annaler: Series A, Physical Geography 87 2 273 288 |