Limnology of Garrow Lake, NWT, Canada
ABSTRACT Garrow Lake (area 418 ha, greatest depth 47 m), Little Cornwallis Island, NWT, Canada, is the northernmost recorded hypersaline meromictic lake, Covered 11 months annually with ice up to 2.4 m thick and internally stratified, its waters at 20 m reach temperatures of 9.1°C from solar heating...
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Cambridge University Press (CUP)
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crcambridgeupr:10.1017/s0032247400008044 2024-03-03T08:43:43+00:00 Limnology of Garrow Lake, NWT, Canada Dickman, M. Ouellet, M. 1987 http://dx.doi.org/10.1017/s0032247400008044 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0032247400008044 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Polar Record volume 23, issue 146, page 531-549 ISSN 0032-2474 1475-3057 General Earth and Planetary Sciences Ecology Geography, Planning and Development journal-article 1987 crcambridgeupr https://doi.org/10.1017/s0032247400008044 2024-02-08T08:34:00Z ABSTRACT Garrow Lake (area 418 ha, greatest depth 47 m), Little Cornwallis Island, NWT, Canada, is the northernmost recorded hypersaline meromictic lake, Covered 11 months annually with ice up to 2.4 m thick and internally stratified, its waters at 20 m reach temperatures of 9.1°C from solar heating throughout the year. Salinity varies from less than 0.01% at the surface to over 75% at the bottom. Isostatic uplift isolated the lake from the sea about 3000 BP. Isotope dating indicates that the bottom water has been unmixed for nearly 2500 years. An advancing permafrost wedge appears to have forced brine from pores in rock strata below the watershed into a talik (chimney) in the lake centre. From November 1981 the lake has received approximately 100 tonnes/hr of mine tailings rich in lead and zinc. Dissolved oxygen introduced along with the slurry may be important in reducing anaerobic photosynthetic bacteria. Biotic diversity is low. Only one vertebrate, Myoxocephalus quadricornis (four-horned sculpin), occurs in the lake. The zooplankton consists of only one species, Limnocalanus macruras phytoplankton includes 51 taxa dominated by flagellates. Article in Journal/Newspaper Cornwallis Island Ice permafrost Polar Record wedge* Cambridge University Press Canada Talik ENVELOPE(146.601,146.601,59.667,59.667) Cornwallis ENVELOPE(-54.464,-54.464,-61.072,-61.072) Little Cornwallis Island ENVELOPE(-96.502,-96.502,75.502,75.502) Cornwallis Island ENVELOPE(-95.001,-95.001,75.135,75.135) Polar Record 23 146 531 549 |
institution |
Open Polar |
collection |
Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
topic |
General Earth and Planetary Sciences Ecology Geography, Planning and Development |
spellingShingle |
General Earth and Planetary Sciences Ecology Geography, Planning and Development Dickman, M. Ouellet, M. Limnology of Garrow Lake, NWT, Canada |
topic_facet |
General Earth and Planetary Sciences Ecology Geography, Planning and Development |
description |
ABSTRACT Garrow Lake (area 418 ha, greatest depth 47 m), Little Cornwallis Island, NWT, Canada, is the northernmost recorded hypersaline meromictic lake, Covered 11 months annually with ice up to 2.4 m thick and internally stratified, its waters at 20 m reach temperatures of 9.1°C from solar heating throughout the year. Salinity varies from less than 0.01% at the surface to over 75% at the bottom. Isostatic uplift isolated the lake from the sea about 3000 BP. Isotope dating indicates that the bottom water has been unmixed for nearly 2500 years. An advancing permafrost wedge appears to have forced brine from pores in rock strata below the watershed into a talik (chimney) in the lake centre. From November 1981 the lake has received approximately 100 tonnes/hr of mine tailings rich in lead and zinc. Dissolved oxygen introduced along with the slurry may be important in reducing anaerobic photosynthetic bacteria. Biotic diversity is low. Only one vertebrate, Myoxocephalus quadricornis (four-horned sculpin), occurs in the lake. The zooplankton consists of only one species, Limnocalanus macruras phytoplankton includes 51 taxa dominated by flagellates. |
format |
Article in Journal/Newspaper |
author |
Dickman, M. Ouellet, M. |
author_facet |
Dickman, M. Ouellet, M. |
author_sort |
Dickman, M. |
title |
Limnology of Garrow Lake, NWT, Canada |
title_short |
Limnology of Garrow Lake, NWT, Canada |
title_full |
Limnology of Garrow Lake, NWT, Canada |
title_fullStr |
Limnology of Garrow Lake, NWT, Canada |
title_full_unstemmed |
Limnology of Garrow Lake, NWT, Canada |
title_sort |
limnology of garrow lake, nwt, canada |
publisher |
Cambridge University Press (CUP) |
publishDate |
1987 |
url |
http://dx.doi.org/10.1017/s0032247400008044 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0032247400008044 |
long_lat |
ENVELOPE(146.601,146.601,59.667,59.667) ENVELOPE(-54.464,-54.464,-61.072,-61.072) ENVELOPE(-96.502,-96.502,75.502,75.502) ENVELOPE(-95.001,-95.001,75.135,75.135) |
geographic |
Canada Talik Cornwallis Little Cornwallis Island Cornwallis Island |
geographic_facet |
Canada Talik Cornwallis Little Cornwallis Island Cornwallis Island |
genre |
Cornwallis Island Ice permafrost Polar Record wedge* |
genre_facet |
Cornwallis Island Ice permafrost Polar Record wedge* |
op_source |
Polar Record volume 23, issue 146, page 531-549 ISSN 0032-2474 1475-3057 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1017/s0032247400008044 |
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Polar Record |
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23 |
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146 |
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531 |
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549 |
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1792499165979213824 |