Late Quaternary environmental history of Taylor Valley, southern Victoria Land, Antarctica, reconstructed by a multidisciplinary study of lake sediments
In the unglaciated areas of Antarctica, lake sediments act as archives of the regional environmental and climatic history. In most cases, the records are restricted to the Holocene. Amongst the few exceptions are lakes in the McMurdo Dry Valleys, southern Victoria Land, which are known to have remai...
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ftubkoeln:oai:USBKOELN.ub.uni-koeln.de:2809 2024-06-02T07:56:15+00:00 Late Quaternary environmental history of Taylor Valley, southern Victoria Land, Antarctica, reconstructed by a multidisciplinary study of lake sediments Ortlepp, Sabrina 2009 application/pdf https://kups.ub.uni-koeln.de/2809/ https://kups.ub.uni-koeln.de/2809/1/Dissertation_Ortlepp.pdf eng eng https://kups.ub.uni-koeln.de/2809/1/Dissertation_Ortlepp.pdf Ortlepp, Sabrina (2009). Late Quaternary environmental history of Taylor Valley, southern Victoria Land, Antarctica, reconstructed by a multidisciplinary study of lake sediments. PhD thesis, Universität zu Köln. ddc:550 doc-type:doctoralThesis publishedVersion Text 2009 ftubkoeln 2024-05-06T11:06:51Z In the unglaciated areas of Antarctica, lake sediments act as archives of the regional environmental and climatic history. In most cases, the records are restricted to the Holocene. Amongst the few exceptions are lakes in the McMurdo Dry Valleys, southern Victoria Land, which are known to have remained mostly ice-free during the Last Glacial Maximum. Within the scope of an U.S.-American-German expedition in austral summer 2002/2003, several sediment cores were recovered from the three major lakes in the Taylor Valley: lakes Fryxell, Hoare, and Bonney. In order to reconstruct the late Quaternary regional environmental and climate history, sedimentological, biogeochemical, mineralogical, and chronological investigations were conducted on the sediment sequences recovered from Lake Hoare (core Lz1020) and East Lake Bonney (core Lz1023) within the scope of this thesis. Sediment cores from Lake Hoare with a maximum length of 2.3 m mainly consist of coarse-grained material and penetrate back into the late Weichselian, when Taylor Valley was occupied by the large proglacial Lake Washburn. This lake was dammed by the advanced Ross Sea ice sheet at the valley outlet and was mainly fed by meltwater of the ice sheet. During the Pleistocene-Holocene transition, enhanced evaporation led to a significant lake level drop of Lake Washburn. The Lake Hoare record additionally shows that in course of this event, Lake Washburn desiccated to a very low level, with subaerial conditions at the coring site of Lz1020. After the final retreat of the Ross Sea ice sheet during the early Holocene, Taylor Valley was occupied by remnants of Lake Washburn. Environmental conditions comparable to those of today, with an advanced Canada Glacier separating lakes Hoare and Fryxell, established during the Mid-Holocene. A 2.7 m long core recovered from East Lake Bonney mainly consists of a halite crust. Variations in the properties of the salt crystals and of clastic components embedded in the salts imply environmental changes over time. New ... Doctoral or Postdoctoral Thesis Antarc* Antarctica Canada Glacier glacier* Ice Sheet McMurdo Dry Valleys Ross Sea Sea ice Victoria Land Cologne University: KUPS Austral Ross Sea Victoria Land McMurdo Dry Valleys Canada Taylor Valley ENVELOPE(163.000,163.000,-77.617,-77.617) Bonney ENVELOPE(162.417,162.417,-77.717,-77.717) Fryxell ENVELOPE(163.183,163.183,-77.617,-77.617) Hoare ENVELOPE(162.850,162.850,-77.633,-77.633) Lake Bonney ENVELOPE(-25.588,-25.588,-80.361,-80.361) Washburn ENVELOPE(-86.133,-86.133,-77.617,-77.617) Lake Hoare ENVELOPE(162.850,162.850,-77.633,-77.633) Canada Glacier ENVELOPE(162.983,162.983,-77.617,-77.617) East Lake ENVELOPE(-100.456,-100.456,58.219,58.219) |
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Open Polar |
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Cologne University: KUPS |
op_collection_id |
ftubkoeln |
language |
English |
topic |
ddc:550 |
spellingShingle |
ddc:550 Ortlepp, Sabrina Late Quaternary environmental history of Taylor Valley, southern Victoria Land, Antarctica, reconstructed by a multidisciplinary study of lake sediments |
topic_facet |
ddc:550 |
description |
In the unglaciated areas of Antarctica, lake sediments act as archives of the regional environmental and climatic history. In most cases, the records are restricted to the Holocene. Amongst the few exceptions are lakes in the McMurdo Dry Valleys, southern Victoria Land, which are known to have remained mostly ice-free during the Last Glacial Maximum. Within the scope of an U.S.-American-German expedition in austral summer 2002/2003, several sediment cores were recovered from the three major lakes in the Taylor Valley: lakes Fryxell, Hoare, and Bonney. In order to reconstruct the late Quaternary regional environmental and climate history, sedimentological, biogeochemical, mineralogical, and chronological investigations were conducted on the sediment sequences recovered from Lake Hoare (core Lz1020) and East Lake Bonney (core Lz1023) within the scope of this thesis. Sediment cores from Lake Hoare with a maximum length of 2.3 m mainly consist of coarse-grained material and penetrate back into the late Weichselian, when Taylor Valley was occupied by the large proglacial Lake Washburn. This lake was dammed by the advanced Ross Sea ice sheet at the valley outlet and was mainly fed by meltwater of the ice sheet. During the Pleistocene-Holocene transition, enhanced evaporation led to a significant lake level drop of Lake Washburn. The Lake Hoare record additionally shows that in course of this event, Lake Washburn desiccated to a very low level, with subaerial conditions at the coring site of Lz1020. After the final retreat of the Ross Sea ice sheet during the early Holocene, Taylor Valley was occupied by remnants of Lake Washburn. Environmental conditions comparable to those of today, with an advanced Canada Glacier separating lakes Hoare and Fryxell, established during the Mid-Holocene. A 2.7 m long core recovered from East Lake Bonney mainly consists of a halite crust. Variations in the properties of the salt crystals and of clastic components embedded in the salts imply environmental changes over time. New ... |
format |
Doctoral or Postdoctoral Thesis |
author |
Ortlepp, Sabrina |
author_facet |
Ortlepp, Sabrina |
author_sort |
Ortlepp, Sabrina |
title |
Late Quaternary environmental history of Taylor Valley, southern Victoria Land, Antarctica, reconstructed by a multidisciplinary study of lake sediments |
title_short |
Late Quaternary environmental history of Taylor Valley, southern Victoria Land, Antarctica, reconstructed by a multidisciplinary study of lake sediments |
title_full |
Late Quaternary environmental history of Taylor Valley, southern Victoria Land, Antarctica, reconstructed by a multidisciplinary study of lake sediments |
title_fullStr |
Late Quaternary environmental history of Taylor Valley, southern Victoria Land, Antarctica, reconstructed by a multidisciplinary study of lake sediments |
title_full_unstemmed |
Late Quaternary environmental history of Taylor Valley, southern Victoria Land, Antarctica, reconstructed by a multidisciplinary study of lake sediments |
title_sort |
late quaternary environmental history of taylor valley, southern victoria land, antarctica, reconstructed by a multidisciplinary study of lake sediments |
publishDate |
2009 |
url |
https://kups.ub.uni-koeln.de/2809/ https://kups.ub.uni-koeln.de/2809/1/Dissertation_Ortlepp.pdf |
long_lat |
ENVELOPE(163.000,163.000,-77.617,-77.617) ENVELOPE(162.417,162.417,-77.717,-77.717) ENVELOPE(163.183,163.183,-77.617,-77.617) ENVELOPE(162.850,162.850,-77.633,-77.633) ENVELOPE(-25.588,-25.588,-80.361,-80.361) ENVELOPE(-86.133,-86.133,-77.617,-77.617) ENVELOPE(162.850,162.850,-77.633,-77.633) ENVELOPE(162.983,162.983,-77.617,-77.617) ENVELOPE(-100.456,-100.456,58.219,58.219) |
geographic |
Austral Ross Sea Victoria Land McMurdo Dry Valleys Canada Taylor Valley Bonney Fryxell Hoare Lake Bonney Washburn Lake Hoare Canada Glacier East Lake |
geographic_facet |
Austral Ross Sea Victoria Land McMurdo Dry Valleys Canada Taylor Valley Bonney Fryxell Hoare Lake Bonney Washburn Lake Hoare Canada Glacier East Lake |
genre |
Antarc* Antarctica Canada Glacier glacier* Ice Sheet McMurdo Dry Valleys Ross Sea Sea ice Victoria Land |
genre_facet |
Antarc* Antarctica Canada Glacier glacier* Ice Sheet McMurdo Dry Valleys Ross Sea Sea ice Victoria Land |
op_relation |
https://kups.ub.uni-koeln.de/2809/1/Dissertation_Ortlepp.pdf Ortlepp, Sabrina (2009). Late Quaternary environmental history of Taylor Valley, southern Victoria Land, Antarctica, reconstructed by a multidisciplinary study of lake sediments. PhD thesis, Universität zu Köln. |
_version_ |
1800754532754391040 |