Limnology, sedimentology, and hydrology of a jökulhlaup into a meromictic High Arctic lake
A large ice-dammed lake drained catastrophically into Lake Tuborg, Ellesmere Island, beginning on 25 July 2003. Limnological, sedimentological, and hydrological parameters were recorded before, during, and after this event. For several weeks prior to the jökulhlaup, water overtopped the ice-dammed l...
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crcansciencepubl:10.1139/e06-125 2024-05-19T07:35:46+00:00 Limnology, sedimentology, and hydrology of a jökulhlaup into a meromictic High Arctic lake Lewis, Ted Francus, Pierre Bradley, Raymond S 2007 http://dx.doi.org/10.1139/e06-125 http://www.nrcresearchpress.com/doi/pdf/10.1139/e06-125 en eng Canadian Science Publishing http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining Canadian Journal of Earth Sciences volume 44, issue 6, page 791-806 ISSN 0008-4077 1480-3313 journal-article 2007 crcansciencepubl https://doi.org/10.1139/e06-125 2024-05-02T06:51:27Z A large ice-dammed lake drained catastrophically into Lake Tuborg, Ellesmere Island, beginning on 25 July 2003. Limnological, sedimentological, and hydrological parameters were recorded before, during, and after this event. For several weeks prior to the jökulhlaup, water overtopped the ice-dammed lake and flowed into Lake Tuborg's freshwater basin. A shallow sill separates the freshwater basin from a larger, deeper basin containing ~25 PSU (practical salinity units) salt water. The sill blocked underflows from entering the saltwater basin before the jökulhlaup. The ice-dammed lake drained completely and catastrophically when englacial or subglacial conduits developed, and a glacier portal formed 980 m from the Lake Tuborg shore, marking the beginning of the jökulhlaup. The level of Lake Tuborg increased by 7.6 m in 84 h. This jökulhlaup is the largest known to have occurred in the High Arctic, and the largest witnessed in Canada since 1947. Strata of very cold water flowed above the chemocline for about 14 km, from the sill to the southwest end of the lake. The cold strata turbulently mixed with underlying salt water, allowing for saltwater flocculation of suspended sediment, causing rapid settling. The saltwater layer very slightly freshened and cooled. Close to the sill, near-surface sediments derived from the jökulhlaup are coarse and laminated; however, no erosion occurred toward the distal end of the lake, where a fining upward unit with a coarse base was deposited. Article in Journal/Newspaper Arctic Ellesmere Island glacier* Canadian Science Publishing Canadian Journal of Earth Sciences 44 6 791 806 |
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Open Polar |
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Canadian Science Publishing |
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crcansciencepubl |
language |
English |
description |
A large ice-dammed lake drained catastrophically into Lake Tuborg, Ellesmere Island, beginning on 25 July 2003. Limnological, sedimentological, and hydrological parameters were recorded before, during, and after this event. For several weeks prior to the jökulhlaup, water overtopped the ice-dammed lake and flowed into Lake Tuborg's freshwater basin. A shallow sill separates the freshwater basin from a larger, deeper basin containing ~25 PSU (practical salinity units) salt water. The sill blocked underflows from entering the saltwater basin before the jökulhlaup. The ice-dammed lake drained completely and catastrophically when englacial or subglacial conduits developed, and a glacier portal formed 980 m from the Lake Tuborg shore, marking the beginning of the jökulhlaup. The level of Lake Tuborg increased by 7.6 m in 84 h. This jökulhlaup is the largest known to have occurred in the High Arctic, and the largest witnessed in Canada since 1947. Strata of very cold water flowed above the chemocline for about 14 km, from the sill to the southwest end of the lake. The cold strata turbulently mixed with underlying salt water, allowing for saltwater flocculation of suspended sediment, causing rapid settling. The saltwater layer very slightly freshened and cooled. Close to the sill, near-surface sediments derived from the jökulhlaup are coarse and laminated; however, no erosion occurred toward the distal end of the lake, where a fining upward unit with a coarse base was deposited. |
format |
Article in Journal/Newspaper |
author |
Lewis, Ted Francus, Pierre Bradley, Raymond S |
spellingShingle |
Lewis, Ted Francus, Pierre Bradley, Raymond S Limnology, sedimentology, and hydrology of a jökulhlaup into a meromictic High Arctic lake |
author_facet |
Lewis, Ted Francus, Pierre Bradley, Raymond S |
author_sort |
Lewis, Ted |
title |
Limnology, sedimentology, and hydrology of a jökulhlaup into a meromictic High Arctic lake |
title_short |
Limnology, sedimentology, and hydrology of a jökulhlaup into a meromictic High Arctic lake |
title_full |
Limnology, sedimentology, and hydrology of a jökulhlaup into a meromictic High Arctic lake |
title_fullStr |
Limnology, sedimentology, and hydrology of a jökulhlaup into a meromictic High Arctic lake |
title_full_unstemmed |
Limnology, sedimentology, and hydrology of a jökulhlaup into a meromictic High Arctic lake |
title_sort |
limnology, sedimentology, and hydrology of a jökulhlaup into a meromictic high arctic lake |
publisher |
Canadian Science Publishing |
publishDate |
2007 |
url |
http://dx.doi.org/10.1139/e06-125 http://www.nrcresearchpress.com/doi/pdf/10.1139/e06-125 |
genre |
Arctic Ellesmere Island glacier* |
genre_facet |
Arctic Ellesmere Island glacier* |
op_source |
Canadian Journal of Earth Sciences volume 44, issue 6, page 791-806 ISSN 0008-4077 1480-3313 |
op_rights |
http://www.nrcresearchpress.com/page/about/CorporateTextAndDataMining |
op_doi |
https://doi.org/10.1139/e06-125 |
container_title |
Canadian Journal of Earth Sciences |
container_volume |
44 |
container_issue |
6 |
container_start_page |
791 |
op_container_end_page |
806 |
_version_ |
1799474784194527232 |