The meromictic lakes and stratified marine basins of the Vestfold Hills, East Antarctica
Thirty-four permanently stratified water bodies were identified in a survey of the Vestfold Hills. Of these, 21 were lakes, six were seasonally isolated marine basins (SIMBs), and seven were marine basins with year round connection to the open ocean. The basins varied markedly in salinity (4 g l −1...
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Cambridge University Press (CUP)
1999
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Online Access: | http://dx.doi.org/10.1017/s0954102099000243 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102099000243 |
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crcambridgeupr:10.1017/s0954102099000243 2024-03-24T08:57:01+00:00 The meromictic lakes and stratified marine basins of the Vestfold Hills, East Antarctica Gibson, John A.E. 1999 http://dx.doi.org/10.1017/s0954102099000243 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102099000243 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Antarctic Science volume 11, issue 2, page 175-192 ISSN 0954-1020 1365-2079 Geology Ecology, Evolution, Behavior and Systematics Oceanography journal-article 1999 crcambridgeupr https://doi.org/10.1017/s0954102099000243 2024-02-26T15:35:23Z Thirty-four permanently stratified water bodies were identified in a survey of the Vestfold Hills. Of these, 21 were lakes, six were seasonally isolated marine basins (SIMBs), and seven were marine basins with year round connection to the open ocean. The basins varied markedly in salinity (4 g l −1 to 235 g l −1 ), temperature (−14°C to 24°C), depth (5 m to 110 m), area (3.6 ha to 146 ha) and surface level (−30 m to 29 m above sea level). The stratification in all the basins was maintained by increases in salinity. During winter, a thermohaline convection cell was present in all lakes and SIMBs directly beneath the ice cover. These cells were the result of brine exclusion from the forming ice, and increased in density throughout winter, penetrating progressively deeper into the lake. Minimum stability, and therefore the maximum likelihood of turnover, occurred at the time of maximum ice formation in spring. At the end of the period of ice formation, the convection cell broke down, and stratification of the surface water occurred. When the ice melted completely, lenses of relatively fresh water capped the lakes, which reduced the effect of wind mixing. Net meltwater input increased the stability of the meromictic basins, while periods of lower water level resulted in deeper penetration of the thermohaline convection cell, increasing the possibility of turnover and destratification. Article in Journal/Newspaper Antarc* Antarctic Science Antarctica East Antarctica Cambridge University Press East Antarctica Vestfold Hills Vestfold Antarctic Science 11 2 175 192 |
institution |
Open Polar |
collection |
Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
topic |
Geology Ecology, Evolution, Behavior and Systematics Oceanography |
spellingShingle |
Geology Ecology, Evolution, Behavior and Systematics Oceanography Gibson, John A.E. The meromictic lakes and stratified marine basins of the Vestfold Hills, East Antarctica |
topic_facet |
Geology Ecology, Evolution, Behavior and Systematics Oceanography |
description |
Thirty-four permanently stratified water bodies were identified in a survey of the Vestfold Hills. Of these, 21 were lakes, six were seasonally isolated marine basins (SIMBs), and seven were marine basins with year round connection to the open ocean. The basins varied markedly in salinity (4 g l −1 to 235 g l −1 ), temperature (−14°C to 24°C), depth (5 m to 110 m), area (3.6 ha to 146 ha) and surface level (−30 m to 29 m above sea level). The stratification in all the basins was maintained by increases in salinity. During winter, a thermohaline convection cell was present in all lakes and SIMBs directly beneath the ice cover. These cells were the result of brine exclusion from the forming ice, and increased in density throughout winter, penetrating progressively deeper into the lake. Minimum stability, and therefore the maximum likelihood of turnover, occurred at the time of maximum ice formation in spring. At the end of the period of ice formation, the convection cell broke down, and stratification of the surface water occurred. When the ice melted completely, lenses of relatively fresh water capped the lakes, which reduced the effect of wind mixing. Net meltwater input increased the stability of the meromictic basins, while periods of lower water level resulted in deeper penetration of the thermohaline convection cell, increasing the possibility of turnover and destratification. |
format |
Article in Journal/Newspaper |
author |
Gibson, John A.E. |
author_facet |
Gibson, John A.E. |
author_sort |
Gibson, John A.E. |
title |
The meromictic lakes and stratified marine basins of the Vestfold Hills, East Antarctica |
title_short |
The meromictic lakes and stratified marine basins of the Vestfold Hills, East Antarctica |
title_full |
The meromictic lakes and stratified marine basins of the Vestfold Hills, East Antarctica |
title_fullStr |
The meromictic lakes and stratified marine basins of the Vestfold Hills, East Antarctica |
title_full_unstemmed |
The meromictic lakes and stratified marine basins of the Vestfold Hills, East Antarctica |
title_sort |
meromictic lakes and stratified marine basins of the vestfold hills, east antarctica |
publisher |
Cambridge University Press (CUP) |
publishDate |
1999 |
url |
http://dx.doi.org/10.1017/s0954102099000243 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102099000243 |
geographic |
East Antarctica Vestfold Hills Vestfold |
geographic_facet |
East Antarctica Vestfold Hills Vestfold |
genre |
Antarc* Antarctic Science Antarctica East Antarctica |
genre_facet |
Antarc* Antarctic Science Antarctica East Antarctica |
op_source |
Antarctic Science volume 11, issue 2, page 175-192 ISSN 0954-1020 1365-2079 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1017/s0954102099000243 |
container_title |
Antarctic Science |
container_volume |
11 |
container_issue |
2 |
container_start_page |
175 |
op_container_end_page |
192 |
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1794405785091964928 |