Millennial-scale climate changes on South Georgia, Southern Ocean
Abstract The location of South Georgia (54°S, 36°W) makes it a suitable site for the study of the climatic connections between temperate and polar environments in the Southern Hemisphere. Because the mass balance of the small cirque glaciers on South Georgia primarily responds to changes in summer t...
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Cambridge University Press (CUP)
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Online Access: | http://dx.doi.org/10.1016/s0033-5894(03)00036-x http://api.elsevier.com/content/article/PII:S003358940300036X?httpAccept=text/xml http://api.elsevier.com/content/article/PII:S003358940300036X?httpAccept=text/plain https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S003358940001214X |
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crcambridgeupr:10.1016/s0033-5894(03)00036-x 2024-06-23T07:55:01+00:00 Millennial-scale climate changes on South Georgia, Southern Ocean Rosqvist, Gunhild C. Schuber, Pernilla 2003 http://dx.doi.org/10.1016/s0033-5894(03)00036-x http://api.elsevier.com/content/article/PII:S003358940300036X?httpAccept=text/xml http://api.elsevier.com/content/article/PII:S003358940300036X?httpAccept=text/plain https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S003358940001214X en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Quaternary Research volume 59, issue 3, page 470-475 ISSN 0033-5894 1096-0287 journal-article 2003 crcambridgeupr https://doi.org/10.1016/s0033-5894(03)00036-x 2024-05-29T08:09:57Z Abstract The location of South Georgia (54°S, 36°W) makes it a suitable site for the study of the climatic connections between temperate and polar environments in the Southern Hemisphere. Because the mass balance of the small cirque glaciers on South Georgia primarily responds to changes in summer temperature they can provide records of changes in the South Atlantic Ocean and atmospheric circulation. We use grey scale density, weight-loss-on-ignition, and grain size analyses to show that the proportion of glacially eroded sediments to organic sediments in Block Lake was highly variable during the last 7400 cal yr B.P. We expect that the glacial signal is clearly detectable above noise originating from nonglacial processes and assume that an increase in glacigenic sediment deposition in Block Lake has followed Holocene glacier advances. We interpret proglacial lake sediment sequences in terms of summer climate warming and cooling events. Prominent millennial-scale features include cooling events between 7200 and 7000, 5200 and 4400, and 2400 and 1600 cal yr B.P. and after 1000 cal yr B.P. Comparison with other terrestrial and marine records reveals that the South Georgian record captures all the important changes in Southern Hemisphere Holocene climate. Our results reveal a tentative coupling between climate changes in the South Atlantic and North Atlantic because the documented temperature changes on South Georgia are anti-phased to those in the North Atlantic. Article in Journal/Newspaper North Atlantic South Atlantic Ocean Southern Ocean Cambridge University Press Block Lake ENVELOPE(-36.717,-36.717,-54.167,-54.167) Southern Ocean Quaternary Research 59 3 470 475 |
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Open Polar |
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Cambridge University Press |
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crcambridgeupr |
language |
English |
description |
Abstract The location of South Georgia (54°S, 36°W) makes it a suitable site for the study of the climatic connections between temperate and polar environments in the Southern Hemisphere. Because the mass balance of the small cirque glaciers on South Georgia primarily responds to changes in summer temperature they can provide records of changes in the South Atlantic Ocean and atmospheric circulation. We use grey scale density, weight-loss-on-ignition, and grain size analyses to show that the proportion of glacially eroded sediments to organic sediments in Block Lake was highly variable during the last 7400 cal yr B.P. We expect that the glacial signal is clearly detectable above noise originating from nonglacial processes and assume that an increase in glacigenic sediment deposition in Block Lake has followed Holocene glacier advances. We interpret proglacial lake sediment sequences in terms of summer climate warming and cooling events. Prominent millennial-scale features include cooling events between 7200 and 7000, 5200 and 4400, and 2400 and 1600 cal yr B.P. and after 1000 cal yr B.P. Comparison with other terrestrial and marine records reveals that the South Georgian record captures all the important changes in Southern Hemisphere Holocene climate. Our results reveal a tentative coupling between climate changes in the South Atlantic and North Atlantic because the documented temperature changes on South Georgia are anti-phased to those in the North Atlantic. |
format |
Article in Journal/Newspaper |
author |
Rosqvist, Gunhild C. Schuber, Pernilla |
spellingShingle |
Rosqvist, Gunhild C. Schuber, Pernilla Millennial-scale climate changes on South Georgia, Southern Ocean |
author_facet |
Rosqvist, Gunhild C. Schuber, Pernilla |
author_sort |
Rosqvist, Gunhild C. |
title |
Millennial-scale climate changes on South Georgia, Southern Ocean |
title_short |
Millennial-scale climate changes on South Georgia, Southern Ocean |
title_full |
Millennial-scale climate changes on South Georgia, Southern Ocean |
title_fullStr |
Millennial-scale climate changes on South Georgia, Southern Ocean |
title_full_unstemmed |
Millennial-scale climate changes on South Georgia, Southern Ocean |
title_sort |
millennial-scale climate changes on south georgia, southern ocean |
publisher |
Cambridge University Press (CUP) |
publishDate |
2003 |
url |
http://dx.doi.org/10.1016/s0033-5894(03)00036-x http://api.elsevier.com/content/article/PII:S003358940300036X?httpAccept=text/xml http://api.elsevier.com/content/article/PII:S003358940300036X?httpAccept=text/plain https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S003358940001214X |
long_lat |
ENVELOPE(-36.717,-36.717,-54.167,-54.167) |
geographic |
Block Lake Southern Ocean |
geographic_facet |
Block Lake Southern Ocean |
genre |
North Atlantic South Atlantic Ocean Southern Ocean |
genre_facet |
North Atlantic South Atlantic Ocean Southern Ocean |
op_source |
Quaternary Research volume 59, issue 3, page 470-475 ISSN 0033-5894 1096-0287 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1016/s0033-5894(03)00036-x |
container_title |
Quaternary Research |
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59 |
container_issue |
3 |
container_start_page |
470 |
op_container_end_page |
475 |
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1802647405549584384 |