Exploration of an ice-cliff grounding zone in Antarctica reveals frozen-on meltwater and high productivity
Ice fluxes across the grounding zone affect global ice-sheet mass loss and sea level rise. Although recent changes in ice fluxes are well constrained by remote sensing, future projections remain uncertain, because key environments affecting ice-sheet dynamics – the ice-sheet bed and grounding zone –...
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ftsubggeo:oai:e-docs.geo-leo.de:11858/11350 2024-02-11T09:55:03+01:00 Exploration of an ice-cliff grounding zone in Antarctica reveals frozen-on meltwater and high productivity Owsianowski, Nils Richter, Claudio Alfred-Wegener-Institut Helmholtz Zentrum für Polar- und Meeresforschung, Bremerhaven, Germany Universität Bremen, Bremen, Germany 2021-05-25 https://doi.org/10.1038/s43247-021-00166-y http://resolver.sub.uni-goettingen.de/purl?gldocs-11858/11350 eng eng Nature Publishing Group UK doi:10.1038/s43247-021-00166-y http://resolver.sub.uni-goettingen.de/purl?gldocs-11858/11350 https://creativecommons.org/licenses/by/4.0/ ddc:577.7 Cryospheric science Environmental impact Marine biology Physical oceanography doc-type:article 2021 ftsubggeo https://doi.org/10.1038/s43247-021-00166-y 2024-01-21T23:12:30Z Ice fluxes across the grounding zone affect global ice-sheet mass loss and sea level rise. Although recent changes in ice fluxes are well constrained by remote sensing, future projections remain uncertain, because key environments affecting ice-sheet dynamics – the ice-sheet bed and grounding zone – are largely unknown. Here, we used a remotely operated vehicle to explore the grounding zone of a Weddell Sea tidewater ice cliff. At 148 m we found a 0.3–0.5 m gap between the ice and the seafloor and a 0.4 m clear facies of debris- and bubble-free basal ice, suggesting freeze-on of meltwater in the distal marine portion of the ice sheet over the last 400 yr. Ploughmarks and low epifauna cover reveal recent grounding line retreat, as corroborated by satellite remote sensing. We found dense algal tufts on the ice cliff and high phytoplankton pigment concentrations, suggesting high productivity fuelled by nutrients from ice melt. As grounded tidewater ice cliffs rim 38% of the Antarctic continent, sinking and downwelling of organic matter along with low benthic turnover may contribute to enhanced carbon sequestration, providing a potentially important feedback to climate. Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research (Alfred-Wegener- Institute, Helmholtz Centre for Polar and Marine Research) https://doi.org/10.13039/501100003207 https://doi.org/10.1594/PANGAEA.909526 https://doi.org/10.1594/PANGAEA.924822 Article in Journal/Newspaper Alfred Wegener Institute Antarc* Antarctic Antarctica Ice Sheet Weddell Sea GEO-LEOe-docs (FID GEO) Antarctic The Antarctic Weddell Sea Weddell Communications Earth & Environment 2 1 |
institution |
Open Polar |
collection |
GEO-LEOe-docs (FID GEO) |
op_collection_id |
ftsubggeo |
language |
English |
topic |
ddc:577.7 Cryospheric science Environmental impact Marine biology Physical oceanography |
spellingShingle |
ddc:577.7 Cryospheric science Environmental impact Marine biology Physical oceanography Owsianowski, Nils Richter, Claudio Alfred-Wegener-Institut Helmholtz Zentrum für Polar- und Meeresforschung, Bremerhaven, Germany Universität Bremen, Bremen, Germany Exploration of an ice-cliff grounding zone in Antarctica reveals frozen-on meltwater and high productivity |
topic_facet |
ddc:577.7 Cryospheric science Environmental impact Marine biology Physical oceanography |
description |
Ice fluxes across the grounding zone affect global ice-sheet mass loss and sea level rise. Although recent changes in ice fluxes are well constrained by remote sensing, future projections remain uncertain, because key environments affecting ice-sheet dynamics – the ice-sheet bed and grounding zone – are largely unknown. Here, we used a remotely operated vehicle to explore the grounding zone of a Weddell Sea tidewater ice cliff. At 148 m we found a 0.3–0.5 m gap between the ice and the seafloor and a 0.4 m clear facies of debris- and bubble-free basal ice, suggesting freeze-on of meltwater in the distal marine portion of the ice sheet over the last 400 yr. Ploughmarks and low epifauna cover reveal recent grounding line retreat, as corroborated by satellite remote sensing. We found dense algal tufts on the ice cliff and high phytoplankton pigment concentrations, suggesting high productivity fuelled by nutrients from ice melt. As grounded tidewater ice cliffs rim 38% of the Antarctic continent, sinking and downwelling of organic matter along with low benthic turnover may contribute to enhanced carbon sequestration, providing a potentially important feedback to climate. Alfred Wegener Institute Helmholtz Centre for Polar and Marine Research (Alfred-Wegener- Institute, Helmholtz Centre for Polar and Marine Research) https://doi.org/10.13039/501100003207 https://doi.org/10.1594/PANGAEA.909526 https://doi.org/10.1594/PANGAEA.924822 |
format |
Article in Journal/Newspaper |
author |
Owsianowski, Nils Richter, Claudio Alfred-Wegener-Institut Helmholtz Zentrum für Polar- und Meeresforschung, Bremerhaven, Germany Universität Bremen, Bremen, Germany |
author_facet |
Owsianowski, Nils Richter, Claudio Alfred-Wegener-Institut Helmholtz Zentrum für Polar- und Meeresforschung, Bremerhaven, Germany Universität Bremen, Bremen, Germany |
author_sort |
Owsianowski, Nils |
title |
Exploration of an ice-cliff grounding zone in Antarctica reveals frozen-on meltwater and high productivity |
title_short |
Exploration of an ice-cliff grounding zone in Antarctica reveals frozen-on meltwater and high productivity |
title_full |
Exploration of an ice-cliff grounding zone in Antarctica reveals frozen-on meltwater and high productivity |
title_fullStr |
Exploration of an ice-cliff grounding zone in Antarctica reveals frozen-on meltwater and high productivity |
title_full_unstemmed |
Exploration of an ice-cliff grounding zone in Antarctica reveals frozen-on meltwater and high productivity |
title_sort |
exploration of an ice-cliff grounding zone in antarctica reveals frozen-on meltwater and high productivity |
publisher |
Nature Publishing Group UK |
publishDate |
2021 |
url |
https://doi.org/10.1038/s43247-021-00166-y http://resolver.sub.uni-goettingen.de/purl?gldocs-11858/11350 |
geographic |
Antarctic The Antarctic Weddell Sea Weddell |
geographic_facet |
Antarctic The Antarctic Weddell Sea Weddell |
genre |
Alfred Wegener Institute Antarc* Antarctic Antarctica Ice Sheet Weddell Sea |
genre_facet |
Alfred Wegener Institute Antarc* Antarctic Antarctica Ice Sheet Weddell Sea |
op_relation |
doi:10.1038/s43247-021-00166-y http://resolver.sub.uni-goettingen.de/purl?gldocs-11858/11350 |
op_rights |
https://creativecommons.org/licenses/by/4.0/ |
op_doi |
https://doi.org/10.1038/s43247-021-00166-y |
container_title |
Communications Earth & Environment |
container_volume |
2 |
container_issue |
1 |
_version_ |
1790593613714948096 |