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...
Published in: | Frontiers in Earth Science |
---|---|
Main Authors: | , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Frontiers Media
2020
|
Subjects: | |
Online Access: | https://orca.cardiff.ac.uk/id/eprint/133147/ https://doi.org/10.3389/feart.2020.00286 https://orca.cardiff.ac.uk/id/eprint/133147/2/feart-08-00286.pdf |
id |
ftunivcardiff:oai:https://orca.cardiff.ac.uk:133147 |
---|---|
record_format |
openpolar |
spelling |
ftunivcardiff:oai:https://orca.cardiff.ac.uk:133147 2023-05-15T13:48:37+02:00 Silicon isotopic composition of dry and wet-based glaciers in Antarctica Hatton, Jade Hendry, Katharine R. Hirst, Catherine Opfergelt, Sophie Henkel, Susann Welch, Susan Wadham, Jemma L. Lyons, William B. Bagshaw, Elizabeth Staubwasser, Michael McKnight, Diane 2020 application/pdf https://orca.cardiff.ac.uk/id/eprint/133147/ https://doi.org/10.3389/feart.2020.00286 https://orca.cardiff.ac.uk/id/eprint/133147/2/feart-08-00286.pdf en eng Frontiers Media https://orca.cardiff.ac.uk/id/eprint/133147/2/feart-08-00286.pdf Hatton, Jade, Hendry, Katharine R., Hirst, Catherine, Opfergelt, Sophie, Henkel, Susann, Welch, Susan, Wadham, Jemma L., Lyons, William B., Bagshaw, Elizabeth https://orca.cardiff.ac.uk/view/cardiffauthors/A1991811U.html orcid:0000-0001-8392-1750 orcid:0000-0001-8392-1750, Staubwasser, Michael and McKnight, Diane 2020. Silicon isotopic composition of dry and wet-based glaciers in Antarctica. Frontiers in Earth Science 8 , 286. 10.3389/feart.2020.00286 https://doi.org/10.3389/feart.2020.00286 file https://orca.cardiff.ac.uk/id/eprint/133147/2/feart-08-00286.pdf doi:10.3389/feart.2020.00286 cc_by CC-BY Article PeerReviewed 2020 ftunivcardiff https://doi.org/10.3389/feart.2020.00286 2022-11-10T23:37:15Z 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 (δ30Si) 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), δ30SiDSi and major ion data from meltwater streams draining a polythermal glacier in the region of the West Antarctic peninsula (King George Island) and a cold-based glacier in East Antarctica (Commonwealth Stream, McMurdo Dry Valleys). These data, alongside other global datasets, improve our understanding of how contrasting glacier thermal regime can impact upon Si cycling and therefore the δ30SiDSi composition. We find a similar δ30SiDSi composition between the two sites, with the streams on King George Island varying between -0.23 and +1.23‰ and the Commonwealth stream varying from -0.40 to +1.14‰. However, meltwater streams in King George Island have higher DSi concentrations, and the two glacial systems exhibit opposite DSi - δ30SiDSi 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 Arctic Cold-based glacier East Antarctica King George Island McMurdo Dry Valleys Cardiff University: ORCA (Online Research @ Cardiff) 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 |
Cardiff University: ORCA (Online Research @ Cardiff) |
op_collection_id |
ftunivcardiff |
language |
English |
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 (δ30Si) 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), δ30SiDSi and major ion data from meltwater streams draining a polythermal glacier in the region of the West Antarctic peninsula (King George Island) and a cold-based glacier in East Antarctica (Commonwealth Stream, McMurdo Dry Valleys). These data, alongside other global datasets, improve our understanding of how contrasting glacier thermal regime can impact upon Si cycling and therefore the δ30SiDSi composition. We find a similar δ30SiDSi composition between the two sites, with the streams on King George Island varying between -0.23 and +1.23‰ and the Commonwealth stream varying from -0.40 to +1.14‰. However, meltwater streams in King George Island have higher DSi concentrations, and the two glacial systems exhibit opposite DSi - δ30SiDSi 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. |
format |
Article in Journal/Newspaper |
author |
Hatton, Jade Hendry, Katharine R. Hirst, Catherine Opfergelt, Sophie Henkel, Susann Welch, Susan Wadham, Jemma L. Lyons, William B. Bagshaw, Elizabeth Staubwasser, Michael McKnight, Diane |
spellingShingle |
Hatton, Jade Hendry, Katharine R. Hirst, Catherine Opfergelt, Sophie Henkel, Susann Welch, Susan Wadham, Jemma L. Lyons, William B. Bagshaw, Elizabeth Staubwasser, Michael McKnight, Diane Silicon isotopic composition of dry and wet-based glaciers in Antarctica |
author_facet |
Hatton, Jade Hendry, Katharine R. Hirst, Catherine Opfergelt, Sophie Henkel, Susann Welch, Susan Wadham, Jemma L. Lyons, William B. Bagshaw, Elizabeth Staubwasser, Michael McKnight, Diane |
author_sort |
Hatton, Jade |
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 |
publishDate |
2020 |
url |
https://orca.cardiff.ac.uk/id/eprint/133147/ https://doi.org/10.3389/feart.2020.00286 https://orca.cardiff.ac.uk/id/eprint/133147/2/feart-08-00286.pdf |
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 Arctic Cold-based glacier East Antarctica King George Island McMurdo Dry Valleys |
genre_facet |
Antarc* Antarctic Antarctic Peninsula Antarctica Arctic Cold-based glacier East Antarctica King George Island McMurdo Dry Valleys |
op_relation |
https://orca.cardiff.ac.uk/id/eprint/133147/2/feart-08-00286.pdf Hatton, Jade, Hendry, Katharine R., Hirst, Catherine, Opfergelt, Sophie, Henkel, Susann, Welch, Susan, Wadham, Jemma L., Lyons, William B., Bagshaw, Elizabeth https://orca.cardiff.ac.uk/view/cardiffauthors/A1991811U.html orcid:0000-0001-8392-1750 orcid:0000-0001-8392-1750, Staubwasser, Michael and McKnight, Diane 2020. Silicon isotopic composition of dry and wet-based glaciers in Antarctica. Frontiers in Earth Science 8 , 286. 10.3389/feart.2020.00286 https://doi.org/10.3389/feart.2020.00286 file https://orca.cardiff.ac.uk/id/eprint/133147/2/feart-08-00286.pdf doi:10.3389/feart.2020.00286 |
op_rights |
cc_by |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.3389/feart.2020.00286 |
container_title |
Frontiers in Earth Science |
container_volume |
8 |
_version_ |
1766249509169397760 |