Carbon Sequestration and Release from Antarctic Lakes: Lake Vida and West Lake Bonney (McMurdo Dry Valleys)
Perennial ice covers on many Antarctic lakes have resulted in high lake inorganic carbon contents. The objective of this paper was to evaluate and compare the brine and CO2 chemistries of Lake Vida (Victoria Valley) and West Lake Bonney (Taylor Valley), two lakes of the McMurdo Dry Valleys (East Ant...
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Online Access: | https://digitalcommons.lsu.edu/geo_pubs/621 https://doi.org/10.1007/s10498-012-9184-1 |
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ftlouisianastuir:oai:digitalcommons.lsu.edu:geo_pubs-1620 2023-06-11T04:04:40+02:00 Carbon Sequestration and Release from Antarctic Lakes: Lake Vida and West Lake Bonney (McMurdo Dry Valleys) Marion, G. M. Murray, A. E. Wagner, B. Fritsen, C. H. Kenig, F. Doran, P. T. 2013-03-01T08:00:00Z https://digitalcommons.lsu.edu/geo_pubs/621 https://doi.org/10.1007/s10498-012-9184-1 unknown LSU Digital Commons https://digitalcommons.lsu.edu/geo_pubs/621 doi:10.1007/s10498-012-9184-1 Faculty Publications FREZCHEM simulation Gas hydrates Global warming Sediment carbon dioxide text 2013 ftlouisianastuir https://doi.org/10.1007/s10498-012-9184-1 2023-05-28T18:16:59Z Perennial ice covers on many Antarctic lakes have resulted in high lake inorganic carbon contents. The objective of this paper was to evaluate and compare the brine and CO2 chemistries of Lake Vida (Victoria Valley) and West Lake Bonney (Taylor Valley), two lakes of the McMurdo Dry Valleys (East Antarctica), and their potential consequences during global warming. An existing geochemical model (FREZCHEM-15) was used to convert measured molarity into molality needed for the FREZCHEM model, and this model added a new algorithm that converts measured DIC into carbonate alkalinity needed for the FREZCHEM model. While quite extensive geochemical information exists for ice-covered Taylor Valley lakes, such as West Lake Bonney, only limited information exists for the recently sampled brine of >25 m ice-thick Lake Vida. Lake Vida brine had a model-calculated pCO2 = 0. 60 bars at the field pH (6. 20); West Lake Bonney had a model-calculated pCO2 = 5. 23 bars at the field pH (5. 46). Despite the high degree of atmospheric CO2 supersaturation in West Lake Bonney, it remains significantly undersaturated with the gas hydrate, CO2·6H2O, unless these gas hydrates are deep in the sediment layer or are metastable having formed under colder temperatures or greater pressures. Because of lower temperatures, Lake Vida could start forming CO2·6H2O at lower pCO2 values than West Lake Bonney; but both lakes are significantly undersaturated with the gas hydrate, CO2·6H2O. For both lakes, simulation of global warming from current subzero temperatures (-13. 4 °C in Lake Vida and -4. 7 °C in West Lake Bonney) to 10 °C has shown that a major loss of solution-phase carbon as CO2 gases and carbonate minerals occurred when the temperatures rose above 0 °C and perennial ice covers would disappear. How important these Antarctic CO2 sources will be for future global warming remains to be seen. But a recent paper has shown that methane increased in atmospheric concentration due to deglaciation about 10,000 years ago. So, CO2 release from ice ... Text Antarc* Antarctic Antarctica East Antarctica McMurdo Dry Valleys LSU Digital Commons (Louisiana State University) Antarctic East Antarctica McMurdo Dry Valleys Taylor Valley ENVELOPE(163.000,163.000,-77.617,-77.617) Bonney ENVELOPE(162.417,162.417,-77.717,-77.717) Lake Bonney ENVELOPE(-25.588,-25.588,-80.361,-80.361) Victoria Valley ENVELOPE(162.000,162.000,-77.383,-77.383) Lake Vida ENVELOPE(161.950,161.950,-77.383,-77.383) Vida Lake ENVELOPE(161.950,161.950,-77.383,-77.383) High Lake ENVELOPE(142.675,142.675,-66.995,-66.995) Aquatic Geochemistry 19 2 135 145 |
institution |
Open Polar |
collection |
LSU Digital Commons (Louisiana State University) |
op_collection_id |
ftlouisianastuir |
language |
unknown |
topic |
FREZCHEM simulation Gas hydrates Global warming Sediment carbon dioxide |
spellingShingle |
FREZCHEM simulation Gas hydrates Global warming Sediment carbon dioxide Marion, G. M. Murray, A. E. Wagner, B. Fritsen, C. H. Kenig, F. Doran, P. T. Carbon Sequestration and Release from Antarctic Lakes: Lake Vida and West Lake Bonney (McMurdo Dry Valleys) |
topic_facet |
FREZCHEM simulation Gas hydrates Global warming Sediment carbon dioxide |
description |
Perennial ice covers on many Antarctic lakes have resulted in high lake inorganic carbon contents. The objective of this paper was to evaluate and compare the brine and CO2 chemistries of Lake Vida (Victoria Valley) and West Lake Bonney (Taylor Valley), two lakes of the McMurdo Dry Valleys (East Antarctica), and their potential consequences during global warming. An existing geochemical model (FREZCHEM-15) was used to convert measured molarity into molality needed for the FREZCHEM model, and this model added a new algorithm that converts measured DIC into carbonate alkalinity needed for the FREZCHEM model. While quite extensive geochemical information exists for ice-covered Taylor Valley lakes, such as West Lake Bonney, only limited information exists for the recently sampled brine of >25 m ice-thick Lake Vida. Lake Vida brine had a model-calculated pCO2 = 0. 60 bars at the field pH (6. 20); West Lake Bonney had a model-calculated pCO2 = 5. 23 bars at the field pH (5. 46). Despite the high degree of atmospheric CO2 supersaturation in West Lake Bonney, it remains significantly undersaturated with the gas hydrate, CO2·6H2O, unless these gas hydrates are deep in the sediment layer or are metastable having formed under colder temperatures or greater pressures. Because of lower temperatures, Lake Vida could start forming CO2·6H2O at lower pCO2 values than West Lake Bonney; but both lakes are significantly undersaturated with the gas hydrate, CO2·6H2O. For both lakes, simulation of global warming from current subzero temperatures (-13. 4 °C in Lake Vida and -4. 7 °C in West Lake Bonney) to 10 °C has shown that a major loss of solution-phase carbon as CO2 gases and carbonate minerals occurred when the temperatures rose above 0 °C and perennial ice covers would disappear. How important these Antarctic CO2 sources will be for future global warming remains to be seen. But a recent paper has shown that methane increased in atmospheric concentration due to deglaciation about 10,000 years ago. So, CO2 release from ice ... |
format |
Text |
author |
Marion, G. M. Murray, A. E. Wagner, B. Fritsen, C. H. Kenig, F. Doran, P. T. |
author_facet |
Marion, G. M. Murray, A. E. Wagner, B. Fritsen, C. H. Kenig, F. Doran, P. T. |
author_sort |
Marion, G. M. |
title |
Carbon Sequestration and Release from Antarctic Lakes: Lake Vida and West Lake Bonney (McMurdo Dry Valleys) |
title_short |
Carbon Sequestration and Release from Antarctic Lakes: Lake Vida and West Lake Bonney (McMurdo Dry Valleys) |
title_full |
Carbon Sequestration and Release from Antarctic Lakes: Lake Vida and West Lake Bonney (McMurdo Dry Valleys) |
title_fullStr |
Carbon Sequestration and Release from Antarctic Lakes: Lake Vida and West Lake Bonney (McMurdo Dry Valleys) |
title_full_unstemmed |
Carbon Sequestration and Release from Antarctic Lakes: Lake Vida and West Lake Bonney (McMurdo Dry Valleys) |
title_sort |
carbon sequestration and release from antarctic lakes: lake vida and west lake bonney (mcmurdo dry valleys) |
publisher |
LSU Digital Commons |
publishDate |
2013 |
url |
https://digitalcommons.lsu.edu/geo_pubs/621 https://doi.org/10.1007/s10498-012-9184-1 |
long_lat |
ENVELOPE(163.000,163.000,-77.617,-77.617) ENVELOPE(162.417,162.417,-77.717,-77.717) ENVELOPE(-25.588,-25.588,-80.361,-80.361) ENVELOPE(162.000,162.000,-77.383,-77.383) ENVELOPE(161.950,161.950,-77.383,-77.383) ENVELOPE(161.950,161.950,-77.383,-77.383) ENVELOPE(142.675,142.675,-66.995,-66.995) |
geographic |
Antarctic East Antarctica McMurdo Dry Valleys Taylor Valley Bonney Lake Bonney Victoria Valley Lake Vida Vida Lake High Lake |
geographic_facet |
Antarctic East Antarctica McMurdo Dry Valleys Taylor Valley Bonney Lake Bonney Victoria Valley Lake Vida Vida Lake High Lake |
genre |
Antarc* Antarctic Antarctica East Antarctica McMurdo Dry Valleys |
genre_facet |
Antarc* Antarctic Antarctica East Antarctica McMurdo Dry Valleys |
op_source |
Faculty Publications |
op_relation |
https://digitalcommons.lsu.edu/geo_pubs/621 doi:10.1007/s10498-012-9184-1 |
op_doi |
https://doi.org/10.1007/s10498-012-9184-1 |
container_title |
Aquatic Geochemistry |
container_volume |
19 |
container_issue |
2 |
container_start_page |
135 |
op_container_end_page |
145 |
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1768389605611012096 |