Subglacial brine flow and wind-induced internal waves in Lake Bonney, Antarctica
© Copyright Antarctic Science Ltd 2020. Brine beneath Taylor Glacier has been proposed to enter the proglacial west lobe of Lake Bonney (WLB) as well as from Blood Falls, a surface discharge point at the Taylor Glacier terminus. The brine strongly influences the geochemistry of the water column of W...
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ftlouisianastuir:oai:digitalcommons.lsu.edu:geo_pubs-1577 2023-06-11T04:06:19+02:00 Subglacial brine flow and wind-induced internal waves in Lake Bonney, Antarctica Lawrence, Jade P. Doran, Peter T. Winslow, Luke A. Priscu, John C. 2020-06-01T07:00:00Z https://digitalcommons.lsu.edu/geo_pubs/578 https://doi.org/10.1017/S0954102020000036 unknown LSU Digital Commons https://digitalcommons.lsu.edu/geo_pubs/578 doi:10.1017/S0954102020000036 Faculty Publications dry valleys hypersalinity lakes proglacial temperature text 2020 ftlouisianastuir https://doi.org/10.1017/S0954102020000036 2023-05-28T18:16:59Z © Copyright Antarctic Science Ltd 2020. Brine beneath Taylor Glacier has been proposed to enter the proglacial west lobe of Lake Bonney (WLB) as well as from Blood Falls, a surface discharge point at the Taylor Glacier terminus. The brine strongly influences the geochemistry of the water column of WLB. Year-round measurements from this study are the first to definitively identify brine intrusions from a subglacial entry point into WLB. Furthermore, we excluded input from Blood Falls by focusing on winter dynamics when the absence of an open water moat prevents surface brine entry. Due to the extremely high salinities below the chemocline in WLB, density stratification is dominated by salinity, and temperature can be used as a passive tracer. Cold brine intrusions enter WLB at the glacier face and intrude into the water column at the depth of neutral buoyancy, where they can be identified by anomalously cold temperatures at that depth. High-resolution measurements also reveal under-ice internal waves associated with katabatic wind events, a novel finding that challenges long-held assumptions about the stability of the WLB water column. Text Antarc* Antarctic Antarctica Taylor Glacier LSU Digital Commons (Louisiana State University) Antarctic Bonney ENVELOPE(162.417,162.417,-77.717,-77.717) Taylor Glacier ENVELOPE(162.167,162.167,-77.733,-77.733) Lake Bonney ENVELOPE(-25.588,-25.588,-80.361,-80.361) Blood Falls ENVELOPE(162.271,162.271,-77.722,-77.722) Antarctic Science 32 3 223 237 |
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Open Polar |
collection |
LSU Digital Commons (Louisiana State University) |
op_collection_id |
ftlouisianastuir |
language |
unknown |
topic |
dry valleys hypersalinity lakes proglacial temperature |
spellingShingle |
dry valleys hypersalinity lakes proglacial temperature Lawrence, Jade P. Doran, Peter T. Winslow, Luke A. Priscu, John C. Subglacial brine flow and wind-induced internal waves in Lake Bonney, Antarctica |
topic_facet |
dry valleys hypersalinity lakes proglacial temperature |
description |
© Copyright Antarctic Science Ltd 2020. Brine beneath Taylor Glacier has been proposed to enter the proglacial west lobe of Lake Bonney (WLB) as well as from Blood Falls, a surface discharge point at the Taylor Glacier terminus. The brine strongly influences the geochemistry of the water column of WLB. Year-round measurements from this study are the first to definitively identify brine intrusions from a subglacial entry point into WLB. Furthermore, we excluded input from Blood Falls by focusing on winter dynamics when the absence of an open water moat prevents surface brine entry. Due to the extremely high salinities below the chemocline in WLB, density stratification is dominated by salinity, and temperature can be used as a passive tracer. Cold brine intrusions enter WLB at the glacier face and intrude into the water column at the depth of neutral buoyancy, where they can be identified by anomalously cold temperatures at that depth. High-resolution measurements also reveal under-ice internal waves associated with katabatic wind events, a novel finding that challenges long-held assumptions about the stability of the WLB water column. |
format |
Text |
author |
Lawrence, Jade P. Doran, Peter T. Winslow, Luke A. Priscu, John C. |
author_facet |
Lawrence, Jade P. Doran, Peter T. Winslow, Luke A. Priscu, John C. |
author_sort |
Lawrence, Jade P. |
title |
Subglacial brine flow and wind-induced internal waves in Lake Bonney, Antarctica |
title_short |
Subglacial brine flow and wind-induced internal waves in Lake Bonney, Antarctica |
title_full |
Subglacial brine flow and wind-induced internal waves in Lake Bonney, Antarctica |
title_fullStr |
Subglacial brine flow and wind-induced internal waves in Lake Bonney, Antarctica |
title_full_unstemmed |
Subglacial brine flow and wind-induced internal waves in Lake Bonney, Antarctica |
title_sort |
subglacial brine flow and wind-induced internal waves in lake bonney, antarctica |
publisher |
LSU Digital Commons |
publishDate |
2020 |
url |
https://digitalcommons.lsu.edu/geo_pubs/578 https://doi.org/10.1017/S0954102020000036 |
long_lat |
ENVELOPE(162.417,162.417,-77.717,-77.717) ENVELOPE(162.167,162.167,-77.733,-77.733) ENVELOPE(-25.588,-25.588,-80.361,-80.361) ENVELOPE(162.271,162.271,-77.722,-77.722) |
geographic |
Antarctic Bonney Taylor Glacier Lake Bonney Blood Falls |
geographic_facet |
Antarctic Bonney Taylor Glacier Lake Bonney Blood Falls |
genre |
Antarc* Antarctic Antarctica Taylor Glacier |
genre_facet |
Antarc* Antarctic Antarctica Taylor Glacier |
op_source |
Faculty Publications |
op_relation |
https://digitalcommons.lsu.edu/geo_pubs/578 doi:10.1017/S0954102020000036 |
op_doi |
https://doi.org/10.1017/S0954102020000036 |
container_title |
Antarctic Science |
container_volume |
32 |
container_issue |
3 |
container_start_page |
223 |
op_container_end_page |
237 |
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1768378183015464960 |