Towards a process-based understanding of Holocene polar climate change. Using glacier-fed lake sediments from Arctic Svalbard and Antarctic South Georgia
Earth`s polar regions are undergoing dramatic changes due to ongoing climate change as demonstrated by increasing temperatures, collapsing ice shelves, Arctic sea ice loss and rapid glacier retreat. Driving an accelerating rise in global sea level, this amplified regional response may have devastati...
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The University of Bergen
2016
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ftunivbergen:oai:bora.uib.no:1956/12040 2023-05-15T14:02:51+02:00 Towards a process-based understanding of Holocene polar climate change. Using glacier-fed lake sediments from Arctic Svalbard and Antarctic South Georgia Bilt, Willem van der 2016-05-03 application/pdf https://hdl.handle.net/1956/12040 eng eng The University of Bergen Paper I: Glacier-fed lakes as paleoenvironmental archives. Submitted Manuscript. This article is not available in BORA. Paper II: Mapping sediment–landform assemblages to constrain lacustrine sedimentation in a glacier-fed lake catchment in northwest Spitsbergen. The article is available in BORA at: http://hdl.handle.net/ 1956/11773 Paper III: Reconstruction of glacier variability from lake sediments reveals dynamic Holocene climate in Svalbard. The article is available in BORA at: http://hdl.handle.net/1956/ 10934 Paper IV: Alkenone-based reconstructions reveal four-phase Holocene temperature evolution for High Arctic Svalbard. Submitted Manuscript. This article is not available in BORA. Paper V: South Georgia glacier fluctuations during the past millennium reveal medieval retreat and inter-hemispheric Little Ice Age. Submitted Manuscript. This article is not available in BORA. https://hdl.handle.net/1956/12040 Copyright the author. All rights reserved. Doctoral thesis 2016 ftunivbergen 2023-03-14T17:41:11Z Earth`s polar regions are undergoing dramatic changes due to ongoing climate change as demonstrated by increasing temperatures, collapsing ice shelves, Arctic sea ice loss and rapid glacier retreat. Driving an accelerating rise in global sea level, this amplified regional response may have devastating global socio-economic consequences in the foreseeable future. Yet the causes and range of polar climate variability remain poorly understood as observational records are short and fragmentary, while climate proxy timeseries remain scarce and often lack resolution. More detailed and longer paleoclimate archives are urgently needed to allow assessment of the full envelope of natural polar climate variability. This would allow us to contextualise ongoing warming and help improve policy scenarios, in effect using the past as the key to both present and future. Glaciers are sensitive recorders of climate variability as demonstrated by their response to ongoing global change. In addition to changes in size, this response is also captured by variations in glacial erosion in alpine glacier systems. The finest constituent of this process, known as glacial flour, is suspended in meltwater streams and may be deposited in downstream lakes. Hence, the bottom sediments of such glacier-fed lakes are continuous archives of past glacier activity and thus represent prime targets for paleoclimate studies. In this thesis, the paleoclimatic potential of glacier-fed lake sediments is harnessed to improve our understanding of past polar climate change. To this end, sensitive sites on Arctic Svalbard and Antarctic South Georgia, in the pathways of major regional circulation patterns, were targeted. Emphasis is placed on the present Holocene interglacial as it is characterised by climatic boundary conditions that are similar to the present. A targeted multi-proxy approach, concentrating on geomorphological mapping, sediment fingerprinting, paleothermometry and advanced numerical techniques, was employed to enhance the potential of ... Doctoral or Postdoctoral Thesis Antarc* Antarctic Arctic Arctic Climate change glacier Ice Shelves Sea ice Svalbard University of Bergen: Bergen Open Research Archive (BORA-UiB) Antarctic Arctic Svalbard |
institution |
Open Polar |
collection |
University of Bergen: Bergen Open Research Archive (BORA-UiB) |
op_collection_id |
ftunivbergen |
language |
English |
description |
Earth`s polar regions are undergoing dramatic changes due to ongoing climate change as demonstrated by increasing temperatures, collapsing ice shelves, Arctic sea ice loss and rapid glacier retreat. Driving an accelerating rise in global sea level, this amplified regional response may have devastating global socio-economic consequences in the foreseeable future. Yet the causes and range of polar climate variability remain poorly understood as observational records are short and fragmentary, while climate proxy timeseries remain scarce and often lack resolution. More detailed and longer paleoclimate archives are urgently needed to allow assessment of the full envelope of natural polar climate variability. This would allow us to contextualise ongoing warming and help improve policy scenarios, in effect using the past as the key to both present and future. Glaciers are sensitive recorders of climate variability as demonstrated by their response to ongoing global change. In addition to changes in size, this response is also captured by variations in glacial erosion in alpine glacier systems. The finest constituent of this process, known as glacial flour, is suspended in meltwater streams and may be deposited in downstream lakes. Hence, the bottom sediments of such glacier-fed lakes are continuous archives of past glacier activity and thus represent prime targets for paleoclimate studies. In this thesis, the paleoclimatic potential of glacier-fed lake sediments is harnessed to improve our understanding of past polar climate change. To this end, sensitive sites on Arctic Svalbard and Antarctic South Georgia, in the pathways of major regional circulation patterns, were targeted. Emphasis is placed on the present Holocene interglacial as it is characterised by climatic boundary conditions that are similar to the present. A targeted multi-proxy approach, concentrating on geomorphological mapping, sediment fingerprinting, paleothermometry and advanced numerical techniques, was employed to enhance the potential of ... |
format |
Doctoral or Postdoctoral Thesis |
author |
Bilt, Willem van der |
spellingShingle |
Bilt, Willem van der Towards a process-based understanding of Holocene polar climate change. Using glacier-fed lake sediments from Arctic Svalbard and Antarctic South Georgia |
author_facet |
Bilt, Willem van der |
author_sort |
Bilt, Willem van der |
title |
Towards a process-based understanding of Holocene polar climate change. Using glacier-fed lake sediments from Arctic Svalbard and Antarctic South Georgia |
title_short |
Towards a process-based understanding of Holocene polar climate change. Using glacier-fed lake sediments from Arctic Svalbard and Antarctic South Georgia |
title_full |
Towards a process-based understanding of Holocene polar climate change. Using glacier-fed lake sediments from Arctic Svalbard and Antarctic South Georgia |
title_fullStr |
Towards a process-based understanding of Holocene polar climate change. Using glacier-fed lake sediments from Arctic Svalbard and Antarctic South Georgia |
title_full_unstemmed |
Towards a process-based understanding of Holocene polar climate change. Using glacier-fed lake sediments from Arctic Svalbard and Antarctic South Georgia |
title_sort |
towards a process-based understanding of holocene polar climate change. using glacier-fed lake sediments from arctic svalbard and antarctic south georgia |
publisher |
The University of Bergen |
publishDate |
2016 |
url |
https://hdl.handle.net/1956/12040 |
geographic |
Antarctic Arctic Svalbard |
geographic_facet |
Antarctic Arctic Svalbard |
genre |
Antarc* Antarctic Arctic Arctic Climate change glacier Ice Shelves Sea ice Svalbard |
genre_facet |
Antarc* Antarctic Arctic Arctic Climate change glacier Ice Shelves Sea ice Svalbard |
op_relation |
Paper I: Glacier-fed lakes as paleoenvironmental archives. Submitted Manuscript. This article is not available in BORA. Paper II: Mapping sediment–landform assemblages to constrain lacustrine sedimentation in a glacier-fed lake catchment in northwest Spitsbergen. The article is available in BORA at: http://hdl.handle.net/ 1956/11773 Paper III: Reconstruction of glacier variability from lake sediments reveals dynamic Holocene climate in Svalbard. The article is available in BORA at: http://hdl.handle.net/1956/ 10934 Paper IV: Alkenone-based reconstructions reveal four-phase Holocene temperature evolution for High Arctic Svalbard. Submitted Manuscript. This article is not available in BORA. Paper V: South Georgia glacier fluctuations during the past millennium reveal medieval retreat and inter-hemispheric Little Ice Age. Submitted Manuscript. This article is not available in BORA. https://hdl.handle.net/1956/12040 |
op_rights |
Copyright the author. All rights reserved. |
_version_ |
1766273264950181888 |