Late Glacial mountain glacier culmination in Arctic Norway prior to the Younger Dryas
Climate changes during the Late Glacial period (LG; 15-11 ka) as recorded in Greenland and Antarctic ice cores show a bipolar pattern. Between 14.5 ka and 13 ka ago, the northern latitudes experienced the Bølling/Allerød (BA) warm period, while southern records feature the Antarctic Cold Reversal (A...
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Online Access: | https://hdl.handle.net/11250/2754479 https://doi.org/10.1016/j.quascirev.2020.106461 |
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ftunivbergen:oai:bora.uib.no:11250/2754479 2023-05-15T14:08:48+02:00 Late Glacial mountain glacier culmination in Arctic Norway prior to the Younger Dryas Wittmeier, Hella Elisa Schaefer, Joerg M. Bakke, Jostein Rupper, Summer Paasche, Øyvind Schwartz, Roseanne Finkel, Robert C. 2020 application/pdf https://hdl.handle.net/11250/2754479 https://doi.org/10.1016/j.quascirev.2020.106461 eng eng Elsevier Norges forskningsråd: 267719 urn:issn:0277-3791 https://hdl.handle.net/11250/2754479 https://doi.org/10.1016/j.quascirev.2020.106461 cristin:1833727 Quaternary Science Reviews. 2020, 245, 106461. Navngivelse 4.0 Internasjonal http://creativecommons.org/licenses/by/4.0/deed.no Copyright the authors. 106461 Quaternary Science Reviews 245 Journal article Peer reviewed 2020 ftunivbergen https://doi.org/10.1016/j.quascirev.2020.106461 2023-03-14T17:43:59Z Climate changes during the Late Glacial period (LG; 15-11 ka) as recorded in Greenland and Antarctic ice cores show a bipolar pattern. Between 14.5 ka and 13 ka ago, the northern latitudes experienced the Bølling/Allerød (BA) warm period, while southern records feature the Antarctic Cold Reversal (ACR). Between 12.9 ka and 11.7 ka ago, the north was under the Younger Dryas (YD) cold spell while southern latitude temperature rose in parallel to atmospheric CO2 concentrations. While the southern hemisphere pattern is well documented in mountain glacier moraine records from New Zealand and Patagonia, in northern mid-latitudes and the Arctic, the LG glacier culmination has been connected to the YD stadial, apparently confirming the bipolar pattern. We present a geomorphic map of mountain glaciers in Arctic Norway, a cosmogenic nuclide chronology from 71 moraine boulders from the LG and the Holocene, and first-order glacier modeling experiments. The model and dating results show that the studied mountain glaciers are most sensitive to summer-temperature change, that their response to those changes is highly correlated to a wider region and that these mountain glaciers in Arctic Norway reached their maximum LG extent about 14 ka ago, prior to the YD. Following considerable retreat through the first part of the YD, glaciers re-stabilized in the mid-YD and showed slower oscillatory retreat through the latter part of the YD. We compare this glacier pattern to updated earlier glacier records in the wider Arctic and North Atlantic region and propose a pattern of coherent glacier response to climate changes during this interval. The LG results from Arctic glaciers show consistency to the glacier record from New Zealand and Patagonia. This first-order interhemispheric coherency of LG mountain glacier fluctuations driven mainly by summer temperature would support the view that the bipolar seesaw was primarily a northern winter phenomenon during the LG period, and the YD in particular. More similar experiments need to be ... Article in Journal/Newspaper Antarc* Antarctic Arctic glacier glacier Greenland North Atlantic University of Bergen: Bergen Open Research Archive (BORA-UiB) Antarctic Arctic Glacial Mountain ENVELOPE(-129.454,-129.454,58.250,58.250) Greenland New Zealand Norway Patagonia The Antarctic Quaternary Science Reviews 245 106461 |
institution |
Open Polar |
collection |
University of Bergen: Bergen Open Research Archive (BORA-UiB) |
op_collection_id |
ftunivbergen |
language |
English |
description |
Climate changes during the Late Glacial period (LG; 15-11 ka) as recorded in Greenland and Antarctic ice cores show a bipolar pattern. Between 14.5 ka and 13 ka ago, the northern latitudes experienced the Bølling/Allerød (BA) warm period, while southern records feature the Antarctic Cold Reversal (ACR). Between 12.9 ka and 11.7 ka ago, the north was under the Younger Dryas (YD) cold spell while southern latitude temperature rose in parallel to atmospheric CO2 concentrations. While the southern hemisphere pattern is well documented in mountain glacier moraine records from New Zealand and Patagonia, in northern mid-latitudes and the Arctic, the LG glacier culmination has been connected to the YD stadial, apparently confirming the bipolar pattern. We present a geomorphic map of mountain glaciers in Arctic Norway, a cosmogenic nuclide chronology from 71 moraine boulders from the LG and the Holocene, and first-order glacier modeling experiments. The model and dating results show that the studied mountain glaciers are most sensitive to summer-temperature change, that their response to those changes is highly correlated to a wider region and that these mountain glaciers in Arctic Norway reached their maximum LG extent about 14 ka ago, prior to the YD. Following considerable retreat through the first part of the YD, glaciers re-stabilized in the mid-YD and showed slower oscillatory retreat through the latter part of the YD. We compare this glacier pattern to updated earlier glacier records in the wider Arctic and North Atlantic region and propose a pattern of coherent glacier response to climate changes during this interval. The LG results from Arctic glaciers show consistency to the glacier record from New Zealand and Patagonia. This first-order interhemispheric coherency of LG mountain glacier fluctuations driven mainly by summer temperature would support the view that the bipolar seesaw was primarily a northern winter phenomenon during the LG period, and the YD in particular. More similar experiments need to be ... |
format |
Article in Journal/Newspaper |
author |
Wittmeier, Hella Elisa Schaefer, Joerg M. Bakke, Jostein Rupper, Summer Paasche, Øyvind Schwartz, Roseanne Finkel, Robert C. |
spellingShingle |
Wittmeier, Hella Elisa Schaefer, Joerg M. Bakke, Jostein Rupper, Summer Paasche, Øyvind Schwartz, Roseanne Finkel, Robert C. Late Glacial mountain glacier culmination in Arctic Norway prior to the Younger Dryas |
author_facet |
Wittmeier, Hella Elisa Schaefer, Joerg M. Bakke, Jostein Rupper, Summer Paasche, Øyvind Schwartz, Roseanne Finkel, Robert C. |
author_sort |
Wittmeier, Hella Elisa |
title |
Late Glacial mountain glacier culmination in Arctic Norway prior to the Younger Dryas |
title_short |
Late Glacial mountain glacier culmination in Arctic Norway prior to the Younger Dryas |
title_full |
Late Glacial mountain glacier culmination in Arctic Norway prior to the Younger Dryas |
title_fullStr |
Late Glacial mountain glacier culmination in Arctic Norway prior to the Younger Dryas |
title_full_unstemmed |
Late Glacial mountain glacier culmination in Arctic Norway prior to the Younger Dryas |
title_sort |
late glacial mountain glacier culmination in arctic norway prior to the younger dryas |
publisher |
Elsevier |
publishDate |
2020 |
url |
https://hdl.handle.net/11250/2754479 https://doi.org/10.1016/j.quascirev.2020.106461 |
long_lat |
ENVELOPE(-129.454,-129.454,58.250,58.250) |
geographic |
Antarctic Arctic Glacial Mountain Greenland New Zealand Norway Patagonia The Antarctic |
geographic_facet |
Antarctic Arctic Glacial Mountain Greenland New Zealand Norway Patagonia The Antarctic |
genre |
Antarc* Antarctic Arctic glacier glacier Greenland North Atlantic |
genre_facet |
Antarc* Antarctic Arctic glacier glacier Greenland North Atlantic |
op_source |
106461 Quaternary Science Reviews 245 |
op_relation |
Norges forskningsråd: 267719 urn:issn:0277-3791 https://hdl.handle.net/11250/2754479 https://doi.org/10.1016/j.quascirev.2020.106461 cristin:1833727 Quaternary Science Reviews. 2020, 245, 106461. |
op_rights |
Navngivelse 4.0 Internasjonal http://creativecommons.org/licenses/by/4.0/deed.no Copyright the authors. |
op_doi |
https://doi.org/10.1016/j.quascirev.2020.106461 |
container_title |
Quaternary Science Reviews |
container_volume |
245 |
container_start_page |
106461 |
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1766280828880420864 |