Dissolved gases in perennially ice-covered lakes of the McMurdo Dry Valleys, Antarctica
Measurements of dissolved N 2 , O 2 , Ar, C O2 , and CH 4 were made in perennially ice-covered Lake Hoare. Results confirm previous reports that O 2 concentrations in the upper water column exceed atmospheric equilibrium and that N 2 and Ar are supersaturated throughout the water column. The mean su...
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Online Access: | http://dx.doi.org/10.1017/s0954102098000170 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102098000170 |
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crcambridgeupr:10.1017/s0954102098000170 2024-03-03T08:38:53+00:00 Dissolved gases in perennially ice-covered lakes of the McMurdo Dry Valleys, Antarctica Andersen, D.T. Mckay, C.P. Wharton, R.A. 1998 http://dx.doi.org/10.1017/s0954102098000170 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102098000170 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Antarctic Science volume 10, issue 2, page 124-133 ISSN 0954-1020 1365-2079 Geology Ecology, Evolution, Behavior and Systematics Oceanography journal-article 1998 crcambridgeupr https://doi.org/10.1017/s0954102098000170 2024-02-08T08:36:23Z Measurements of dissolved N 2 , O 2 , Ar, C O2 , and CH 4 were made in perennially ice-covered Lake Hoare. Results confirm previous reports that O 2 concentrations in the upper water column exceed atmospheric equilibrium and that N 2 and Ar are supersaturated throughout the water column. The mean supersaturation of N 2 was found to be 2.0 (±0.37) and Ar was 3.8 (±1.1). The ratios of N 2 /Ar (20.3 ±3.8), and O 2 /Ar (22.5 ±4.0) at the ice-water interface are consistent with those previously measured, suggesting that bubble formation is the main process for removing gas from the lake. However, the saturations of N 2 and Ar greatly exceed those previously predicted for degassing by bubble formation only at the ice-water interface. The data support the hypothesis that removal of gas by bubbles occurs in the water column to a depth of 11 m in Lake Hoare. CO 2 concentration increases from near zero at the ice-water interface to 80–100 times saturation at and below the chemocline at c . 28 m. There is considerable variability in the gas concentrations throughout the water column; samples separated in depth by one metre may vary by more than 50% in gas content. It is likely that this phenomenon results from the lack of turbulent mixing in the water column. Methane ( c . 2 μg 1 −1 ) was detected below the chemocline and immediately above the sediment/water interface at a depth of 30 m. Samples from lakes Vanda, Joyce, and Miers, also show supersaturations of O 2 , N 2 , and Ar at levels similar to levels found in Lake Hoare. Article in Journal/Newspaper Antarc* Antarctic Science Antarctica McMurdo Dry Valleys Cambridge University Press McMurdo Dry Valleys Miers ENVELOPE(163.850,163.850,-78.100,-78.100) Vanda ENVELOPE(161.550,161.550,-77.533,-77.533) Hoare ENVELOPE(162.850,162.850,-77.633,-77.633) Lake Hoare ENVELOPE(162.850,162.850,-77.633,-77.633) Antarctic Science 10 2 124 133 |
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 Andersen, D.T. Mckay, C.P. Wharton, R.A. Dissolved gases in perennially ice-covered lakes of the McMurdo Dry Valleys, Antarctica |
topic_facet |
Geology Ecology, Evolution, Behavior and Systematics Oceanography |
description |
Measurements of dissolved N 2 , O 2 , Ar, C O2 , and CH 4 were made in perennially ice-covered Lake Hoare. Results confirm previous reports that O 2 concentrations in the upper water column exceed atmospheric equilibrium and that N 2 and Ar are supersaturated throughout the water column. The mean supersaturation of N 2 was found to be 2.0 (±0.37) and Ar was 3.8 (±1.1). The ratios of N 2 /Ar (20.3 ±3.8), and O 2 /Ar (22.5 ±4.0) at the ice-water interface are consistent with those previously measured, suggesting that bubble formation is the main process for removing gas from the lake. However, the saturations of N 2 and Ar greatly exceed those previously predicted for degassing by bubble formation only at the ice-water interface. The data support the hypothesis that removal of gas by bubbles occurs in the water column to a depth of 11 m in Lake Hoare. CO 2 concentration increases from near zero at the ice-water interface to 80–100 times saturation at and below the chemocline at c . 28 m. There is considerable variability in the gas concentrations throughout the water column; samples separated in depth by one metre may vary by more than 50% in gas content. It is likely that this phenomenon results from the lack of turbulent mixing in the water column. Methane ( c . 2 μg 1 −1 ) was detected below the chemocline and immediately above the sediment/water interface at a depth of 30 m. Samples from lakes Vanda, Joyce, and Miers, also show supersaturations of O 2 , N 2 , and Ar at levels similar to levels found in Lake Hoare. |
format |
Article in Journal/Newspaper |
author |
Andersen, D.T. Mckay, C.P. Wharton, R.A. |
author_facet |
Andersen, D.T. Mckay, C.P. Wharton, R.A. |
author_sort |
Andersen, D.T. |
title |
Dissolved gases in perennially ice-covered lakes of the McMurdo Dry Valleys, Antarctica |
title_short |
Dissolved gases in perennially ice-covered lakes of the McMurdo Dry Valleys, Antarctica |
title_full |
Dissolved gases in perennially ice-covered lakes of the McMurdo Dry Valleys, Antarctica |
title_fullStr |
Dissolved gases in perennially ice-covered lakes of the McMurdo Dry Valleys, Antarctica |
title_full_unstemmed |
Dissolved gases in perennially ice-covered lakes of the McMurdo Dry Valleys, Antarctica |
title_sort |
dissolved gases in perennially ice-covered lakes of the mcmurdo dry valleys, antarctica |
publisher |
Cambridge University Press (CUP) |
publishDate |
1998 |
url |
http://dx.doi.org/10.1017/s0954102098000170 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102098000170 |
long_lat |
ENVELOPE(163.850,163.850,-78.100,-78.100) ENVELOPE(161.550,161.550,-77.533,-77.533) ENVELOPE(162.850,162.850,-77.633,-77.633) ENVELOPE(162.850,162.850,-77.633,-77.633) |
geographic |
McMurdo Dry Valleys Miers Vanda Hoare Lake Hoare |
geographic_facet |
McMurdo Dry Valleys Miers Vanda Hoare Lake Hoare |
genre |
Antarc* Antarctic Science Antarctica McMurdo Dry Valleys |
genre_facet |
Antarc* Antarctic Science Antarctica McMurdo Dry Valleys |
op_source |
Antarctic Science volume 10, issue 2, page 124-133 ISSN 0954-1020 1365-2079 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1017/s0954102098000170 |
container_title |
Antarctic Science |
container_volume |
10 |
container_issue |
2 |
container_start_page |
124 |
op_container_end_page |
133 |
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1792507359189270528 |