Silicon Isotopic Composition of Dry and Wet-Based Glaciers in Antarctica
Glaciers and ice sheets export significant amounts of silicon (Si) to downstream ecosystems, impacting local and potentially global biogeochemical cycles. Recent studies have shown Si in Arctic glacial meltwaters to have an isotopically distinct signature when compared to non-glacial rivers. This is...
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Online Access: | http://hdl.handle.net/2078.1/235030 https://doi.org/10.3389/feart.2020.00286 |
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ftunivlouvain:oai:dial.uclouvain.be:boreal:235030 2024-05-12T07:55:38+00:00 Silicon Isotopic Composition of Dry and Wet-Based Glaciers in Antarctica Hatton, Jade E. Hendry, Katharine R. Hirst, Catherine Opfergelt, Sophie Henkel, Susann Silva-Busso, Adrián Welch, Susan A. Wadham, Jemma L. Lyons, W. Berry Bagshaw, Elizabeth Staubwasser, Michael McKnight, Diane M. UCL - SST/ELI/ELIE - Environmental Sciences 2020 http://hdl.handle.net/2078.1/235030 https://doi.org/10.3389/feart.2020.00286 eng eng Frontiers Media SA boreal:235030 http://hdl.handle.net/2078.1/235030 doi:10.3389/feart.2020.00286 urn:EISSN:2296-6463 info:eu-repo/semantics/openAccess Frontiers in Earth Science, Vol. 8, p. 286 (2020) solicon isotope geochemistry Antartica stream weathering subglacial weathering silicon cycle info:eu-repo/semantics/article 2020 ftunivlouvain https://doi.org/10.3389/feart.2020.00286 2024-04-17T16:43:26Z Glaciers and ice sheets export significant amounts of silicon (Si) to downstream ecosystems, impacting local and potentially global biogeochemical cycles. Recent studies have shown Si in Arctic glacial meltwaters to have an isotopically distinct signature when compared to non-glacial rivers. This is likely linked to subglacial weathering processes and mechanochemical reactions. However, there are currently no silicon isotope (d30Si) data available from meltwater streams in Antarctica, limiting the current inferences on global glacial silicon isotopic composition and its drivers. To address this gap, we present dissolved silicon (DSi), d30SiDSi, and major ion data from meltwater streams draining a polythermal glacier in the region of the West Antarctic Peninsula (WAP; King George Island) and a cold-based glacier in East Antarctica [Commonwealth Stream, McMurdo Dry Valleys (MDV)]. These data, alongside other global datasets, improve our understanding of how contrasting glacier thermal regime can impact upon Si cycling and therefore the d30SiDSi composition. We find a similar d30SiDSi composition between the two sites, with the streams on King George Island varying between -0.23 and C1.23h and the Commonwealth stream varying from - 0.40 to C1.14h. However, meltwater streams in King George Island have higher DSi concentrations, and the two glacial systems exhibit opposite DSi – d30SiDSi trends. These contrasts likely result from differences in weathering processes, specifically the role of subglacial processes (King George Island) and, supraglacial processes followed by in-stream weathering in hyporheic zones (Commonwealth Stream). These findings are important when considering likely changes in nutrient fluxes from Antarctic glaciers under climatic warming scenarios and consequent shifts in glacial thermal regimes. Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Antarctica antartic* Arctic Cold-based glacier East Antarctica King George Island McMurdo Dry Valleys DIAL@UCLouvain (Université catholique de Louvain) Antarctic Antarctic Peninsula Arctic Commonwealth Stream ENVELOPE(163.500,163.500,-77.583,-77.583) East Antarctica King George Island McMurdo Dry Valleys Frontiers in Earth Science 8 |
institution |
Open Polar |
collection |
DIAL@UCLouvain (Université catholique de Louvain) |
op_collection_id |
ftunivlouvain |
language |
English |
topic |
solicon isotope geochemistry Antartica stream weathering subglacial weathering silicon cycle |
spellingShingle |
solicon isotope geochemistry Antartica stream weathering subglacial weathering silicon cycle Hatton, Jade E. Hendry, Katharine R. Hirst, Catherine Opfergelt, Sophie Henkel, Susann Silva-Busso, Adrián Welch, Susan A. Wadham, Jemma L. Lyons, W. Berry Bagshaw, Elizabeth Staubwasser, Michael McKnight, Diane M. Silicon Isotopic Composition of Dry and Wet-Based Glaciers in Antarctica |
topic_facet |
solicon isotope geochemistry Antartica stream weathering subglacial weathering silicon cycle |
description |
Glaciers and ice sheets export significant amounts of silicon (Si) to downstream ecosystems, impacting local and potentially global biogeochemical cycles. Recent studies have shown Si in Arctic glacial meltwaters to have an isotopically distinct signature when compared to non-glacial rivers. This is likely linked to subglacial weathering processes and mechanochemical reactions. However, there are currently no silicon isotope (d30Si) data available from meltwater streams in Antarctica, limiting the current inferences on global glacial silicon isotopic composition and its drivers. To address this gap, we present dissolved silicon (DSi), d30SiDSi, and major ion data from meltwater streams draining a polythermal glacier in the region of the West Antarctic Peninsula (WAP; King George Island) and a cold-based glacier in East Antarctica [Commonwealth Stream, McMurdo Dry Valleys (MDV)]. These data, alongside other global datasets, improve our understanding of how contrasting glacier thermal regime can impact upon Si cycling and therefore the d30SiDSi composition. We find a similar d30SiDSi composition between the two sites, with the streams on King George Island varying between -0.23 and C1.23h and the Commonwealth stream varying from - 0.40 to C1.14h. However, meltwater streams in King George Island have higher DSi concentrations, and the two glacial systems exhibit opposite DSi – d30SiDSi trends. These contrasts likely result from differences in weathering processes, specifically the role of subglacial processes (King George Island) and, supraglacial processes followed by in-stream weathering in hyporheic zones (Commonwealth Stream). These findings are important when considering likely changes in nutrient fluxes from Antarctic glaciers under climatic warming scenarios and consequent shifts in glacial thermal regimes. |
author2 |
UCL - SST/ELI/ELIE - Environmental Sciences |
format |
Article in Journal/Newspaper |
author |
Hatton, Jade E. Hendry, Katharine R. Hirst, Catherine Opfergelt, Sophie Henkel, Susann Silva-Busso, Adrián Welch, Susan A. Wadham, Jemma L. Lyons, W. Berry Bagshaw, Elizabeth Staubwasser, Michael McKnight, Diane M. |
author_facet |
Hatton, Jade E. Hendry, Katharine R. Hirst, Catherine Opfergelt, Sophie Henkel, Susann Silva-Busso, Adrián Welch, Susan A. Wadham, Jemma L. Lyons, W. Berry Bagshaw, Elizabeth Staubwasser, Michael McKnight, Diane M. |
author_sort |
Hatton, Jade E. |
title |
Silicon Isotopic Composition of Dry and Wet-Based Glaciers in Antarctica |
title_short |
Silicon Isotopic Composition of Dry and Wet-Based Glaciers in Antarctica |
title_full |
Silicon Isotopic Composition of Dry and Wet-Based Glaciers in Antarctica |
title_fullStr |
Silicon Isotopic Composition of Dry and Wet-Based Glaciers in Antarctica |
title_full_unstemmed |
Silicon Isotopic Composition of Dry and Wet-Based Glaciers in Antarctica |
title_sort |
silicon isotopic composition of dry and wet-based glaciers in antarctica |
publisher |
Frontiers Media SA |
publishDate |
2020 |
url |
http://hdl.handle.net/2078.1/235030 https://doi.org/10.3389/feart.2020.00286 |
long_lat |
ENVELOPE(163.500,163.500,-77.583,-77.583) |
geographic |
Antarctic Antarctic Peninsula Arctic Commonwealth Stream East Antarctica King George Island McMurdo Dry Valleys |
geographic_facet |
Antarctic Antarctic Peninsula Arctic Commonwealth Stream East Antarctica King George Island McMurdo Dry Valleys |
genre |
Antarc* Antarctic Antarctic Peninsula Antarctica antartic* Arctic Cold-based glacier East Antarctica King George Island McMurdo Dry Valleys |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Antarctica antartic* Arctic Cold-based glacier East Antarctica King George Island McMurdo Dry Valleys |
op_source |
Frontiers in Earth Science, Vol. 8, p. 286 (2020) |
op_relation |
boreal:235030 http://hdl.handle.net/2078.1/235030 doi:10.3389/feart.2020.00286 urn:EISSN:2296-6463 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.3389/feart.2020.00286 |
container_title |
Frontiers in Earth Science |
container_volume |
8 |
_version_ |
1798835457093533696 |