Chemistry and stratification of Antarctic meltwater ponds II: Inland ponds in the McMurdo Dry Valleys, Victoria Land
Meltwater ponds in the Victoria Valley and in the Labyrinth at the head of the Wright Valley of Victoria Land were sampled in January (summer) and October (late winter) of 2004 to establish their geochemistry and stratification, and to compare this with that of coastal meltwater ponds at a similar l...
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Language: | English |
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Online Access: | http://dx.doi.org/10.1017/s0954102006000575 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102006000575 |
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crcambridgeupr:10.1017/s0954102006000575 2024-03-03T08:38:23+00:00 Chemistry and stratification of Antarctic meltwater ponds II: Inland ponds in the McMurdo Dry Valleys, Victoria Land Healy, M. Webster-Brown, J.G. Brown, K.L. Lane, V. 2006 http://dx.doi.org/10.1017/s0954102006000575 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102006000575 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Antarctic Science volume 18, issue 4, page 525-533 ISSN 0954-1020 1365-2079 Geology Ecology, Evolution, Behavior and Systematics Oceanography journal-article 2006 crcambridgeupr https://doi.org/10.1017/s0954102006000575 2024-02-08T08:48:29Z Meltwater ponds in the Victoria Valley and in the Labyrinth at the head of the Wright Valley of Victoria Land were sampled in January (summer) and October (late winter) of 2004 to establish their geochemistry and stratification, and to compare this with that of coastal meltwater ponds at a similar latitude near Bratina Island. In summer, vertical profiles were measured in 14 ponds; 10 were thermally stratified (maximum ΔT = 11.5°C) and 12 demonstrated a conductivity increase (∼25x) in the lowest 10–20 cm of the water column. When 11 of these ponds were resampled in October, the ice columns were stratified with respect to conductivity and five ponds had highly saline (up to 148 mS cm −1 ), oxygenated basal brines present under the ice. Basal brines and summer melt waters were Na-Cl dominated, and Victoria Valley pond meltwaters were enriched in Ca relative to the Labyrinth ponds. Early gypsum precipitation directs the chemical evolution of residual brine during freezing. These ponds were enriched in NO 3 relative to the coastal ponds at Bratina Island, due to dissolution of nitrate-bearing soil salts, and the reduced influence of marine aerosols and biological productivity on pond chemistry. Article in Journal/Newspaper Antarc* Antarctic Antarctic Science Bratina Island McMurdo Dry Valleys Victoria Land Cambridge University Press Antarctic Victoria Land McMurdo Dry Valleys Wright Valley ENVELOPE(161.833,161.833,-77.517,-77.517) Labyrinth ENVELOPE(160.833,160.833,-77.550,-77.550) Victoria Valley ENVELOPE(162.000,162.000,-77.383,-77.383) Bratina Island ENVELOPE(165.533,165.533,-78.017,-78.017) Valley Pond ENVELOPE(-54.898,-54.898,49.567,49.567) Antarctic Science 18 4 525 533 |
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 Healy, M. Webster-Brown, J.G. Brown, K.L. Lane, V. Chemistry and stratification of Antarctic meltwater ponds II: Inland ponds in the McMurdo Dry Valleys, Victoria Land |
topic_facet |
Geology Ecology, Evolution, Behavior and Systematics Oceanography |
description |
Meltwater ponds in the Victoria Valley and in the Labyrinth at the head of the Wright Valley of Victoria Land were sampled in January (summer) and October (late winter) of 2004 to establish their geochemistry and stratification, and to compare this with that of coastal meltwater ponds at a similar latitude near Bratina Island. In summer, vertical profiles were measured in 14 ponds; 10 were thermally stratified (maximum ΔT = 11.5°C) and 12 demonstrated a conductivity increase (∼25x) in the lowest 10–20 cm of the water column. When 11 of these ponds were resampled in October, the ice columns were stratified with respect to conductivity and five ponds had highly saline (up to 148 mS cm −1 ), oxygenated basal brines present under the ice. Basal brines and summer melt waters were Na-Cl dominated, and Victoria Valley pond meltwaters were enriched in Ca relative to the Labyrinth ponds. Early gypsum precipitation directs the chemical evolution of residual brine during freezing. These ponds were enriched in NO 3 relative to the coastal ponds at Bratina Island, due to dissolution of nitrate-bearing soil salts, and the reduced influence of marine aerosols and biological productivity on pond chemistry. |
format |
Article in Journal/Newspaper |
author |
Healy, M. Webster-Brown, J.G. Brown, K.L. Lane, V. |
author_facet |
Healy, M. Webster-Brown, J.G. Brown, K.L. Lane, V. |
author_sort |
Healy, M. |
title |
Chemistry and stratification of Antarctic meltwater ponds II: Inland ponds in the McMurdo Dry Valleys, Victoria Land |
title_short |
Chemistry and stratification of Antarctic meltwater ponds II: Inland ponds in the McMurdo Dry Valleys, Victoria Land |
title_full |
Chemistry and stratification of Antarctic meltwater ponds II: Inland ponds in the McMurdo Dry Valleys, Victoria Land |
title_fullStr |
Chemistry and stratification of Antarctic meltwater ponds II: Inland ponds in the McMurdo Dry Valleys, Victoria Land |
title_full_unstemmed |
Chemistry and stratification of Antarctic meltwater ponds II: Inland ponds in the McMurdo Dry Valleys, Victoria Land |
title_sort |
chemistry and stratification of antarctic meltwater ponds ii: inland ponds in the mcmurdo dry valleys, victoria land |
publisher |
Cambridge University Press (CUP) |
publishDate |
2006 |
url |
http://dx.doi.org/10.1017/s0954102006000575 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102006000575 |
long_lat |
ENVELOPE(161.833,161.833,-77.517,-77.517) ENVELOPE(160.833,160.833,-77.550,-77.550) ENVELOPE(162.000,162.000,-77.383,-77.383) ENVELOPE(165.533,165.533,-78.017,-78.017) ENVELOPE(-54.898,-54.898,49.567,49.567) |
geographic |
Antarctic Victoria Land McMurdo Dry Valleys Wright Valley Labyrinth Victoria Valley Bratina Island Valley Pond |
geographic_facet |
Antarctic Victoria Land McMurdo Dry Valleys Wright Valley Labyrinth Victoria Valley Bratina Island Valley Pond |
genre |
Antarc* Antarctic Antarctic Science Bratina Island McMurdo Dry Valleys Victoria Land |
genre_facet |
Antarc* Antarctic Antarctic Science Bratina Island McMurdo Dry Valleys Victoria Land |
op_source |
Antarctic Science volume 18, issue 4, page 525-533 ISSN 0954-1020 1365-2079 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1017/s0954102006000575 |
container_title |
Antarctic Science |
container_volume |
18 |
container_issue |
4 |
container_start_page |
525 |
op_container_end_page |
533 |
_version_ |
1792506764404457472 |