Ocean variability beneath the Filchner‐Ronne Ice Shelf inferred from basal melt rate time series
Fourteen phase-sensitive radars (ApRES) were deployed on the Filchner-Ronne Ice Shelf (FRIS) to measure variability in its basal melt rate. Melt rates from sites along the Ronne Depression vary seasonally, consistent with the dynamics of the propagation of seasonal dense water from the western ice f...
Published in: | Journal of Geophysical Research: Oceans |
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Format: | Article in Journal/Newspaper |
Language: | English |
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American Geophysical Union
2022
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Online Access: | http://nora.nerc.ac.uk/id/eprint/533320/ https://nora.nerc.ac.uk/id/eprint/533320/1/JGR%20Oceans%20-%202022%20-%20Va%20kov%20-%20Ocean%20Variability%20Beneath%20the%20Filchner%E2%80%90Ronne%20Ice%20Shelf%20Inferred%20From%20Basal%20Melt%20Rate%20Time.pdf https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2022JC018879 |
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ftnerc:oai:nora.nerc.ac.uk:533320 2023-05-15T15:44:19+02:00 Ocean variability beneath the Filchner‐Ronne Ice Shelf inferred from basal melt rate time series Vaňková, Irena Nicholls, Keith W. 2022-10-04 text http://nora.nerc.ac.uk/id/eprint/533320/ https://nora.nerc.ac.uk/id/eprint/533320/1/JGR%20Oceans%20-%202022%20-%20Va%20kov%20-%20Ocean%20Variability%20Beneath%20the%20Filchner%E2%80%90Ronne%20Ice%20Shelf%20Inferred%20From%20Basal%20Melt%20Rate%20Time.pdf https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2022JC018879 en eng American Geophysical Union https://nora.nerc.ac.uk/id/eprint/533320/1/JGR%20Oceans%20-%202022%20-%20Va%20kov%20-%20Ocean%20Variability%20Beneath%20the%20Filchner%E2%80%90Ronne%20Ice%20Shelf%20Inferred%20From%20Basal%20Melt%20Rate%20Time.pdf Vaňková, Irena orcid:0000-0003-4351-3781 Nicholls, Keith W. orcid:0000-0002-2188-4509 . 2022 Ocean variability beneath the Filchner‐Ronne Ice Shelf inferred from basal melt rate time series. Journal of Geophysical Research: Oceans, 127 (10). 20, pp. https://doi.org/10.1029/2022JC018879 <https://doi.org/10.1029/2022JC018879> cc_by_4 CC-BY Publication - Article PeerReviewed 2022 ftnerc https://doi.org/10.1029/2022JC018879 2023-02-04T19:53:40Z Fourteen phase-sensitive radars (ApRES) were deployed on the Filchner-Ronne Ice Shelf (FRIS) to measure variability in its basal melt rate. Melt rates from sites along the Ronne Depression vary seasonally, consistent with the dynamics of the propagation of seasonal dense water from the western ice front into the cavity. Several sites at the back of the FRIS cavity feature a signal with two seasonal maxima. Sub-ice shelf oceanographic data available from one of the sites indicate that this signal is caused by two different pathways followed by the same source water. Inter-annual variability is strongest along a direct flow pathway between western Ronne Ice Front and western Berkner Island. Highest melting occurred in 1999 and 2018, following anomalously low summer sea-ice concentrations in front of the ice shelf. Inter-annual melt rate variability at the back of the FRIS cavity is limited. If present, it is expressed as a suppression or delay in the arrival of the seasonal melt rate minimum, which can be understood in terms of inter-annual stratification changes and variable inflow pathways toward the sites. Long term mean ApRES melt rates agree with estimates from satellite data over eastern FRIS. However, the satellite estimates overstate the area of active basal freezing in the western part of the ice shelf. Furthermore, the temporal melt rate variability from the satellite estimates exaggerates the range of variability at both seasonal and inter-annual time scales with any correspondence between the in-situ and remotely derived inter-annual variability being limited to a single site. Article in Journal/Newspaper Berkner Island Filchner Ronne Ice Shelf Filchner-Ronne Ice Shelf Ice Shelf Ronne Ice Shelf Sea ice Natural Environment Research Council: NERC Open Research Archive Ronne Ice Shelf ENVELOPE(-61.000,-61.000,-78.500,-78.500) Berkner Island ENVELOPE(-48.117,-48.117,-79.333,-79.333) Ronne Ice Front ENVELOPE(-55.000,-55.000,-76.000,-76.000) Journal of Geophysical Research: Oceans 127 10 |
institution |
Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
op_collection_id |
ftnerc |
language |
English |
description |
Fourteen phase-sensitive radars (ApRES) were deployed on the Filchner-Ronne Ice Shelf (FRIS) to measure variability in its basal melt rate. Melt rates from sites along the Ronne Depression vary seasonally, consistent with the dynamics of the propagation of seasonal dense water from the western ice front into the cavity. Several sites at the back of the FRIS cavity feature a signal with two seasonal maxima. Sub-ice shelf oceanographic data available from one of the sites indicate that this signal is caused by two different pathways followed by the same source water. Inter-annual variability is strongest along a direct flow pathway between western Ronne Ice Front and western Berkner Island. Highest melting occurred in 1999 and 2018, following anomalously low summer sea-ice concentrations in front of the ice shelf. Inter-annual melt rate variability at the back of the FRIS cavity is limited. If present, it is expressed as a suppression or delay in the arrival of the seasonal melt rate minimum, which can be understood in terms of inter-annual stratification changes and variable inflow pathways toward the sites. Long term mean ApRES melt rates agree with estimates from satellite data over eastern FRIS. However, the satellite estimates overstate the area of active basal freezing in the western part of the ice shelf. Furthermore, the temporal melt rate variability from the satellite estimates exaggerates the range of variability at both seasonal and inter-annual time scales with any correspondence between the in-situ and remotely derived inter-annual variability being limited to a single site. |
format |
Article in Journal/Newspaper |
author |
Vaňková, Irena Nicholls, Keith W. |
spellingShingle |
Vaňková, Irena Nicholls, Keith W. Ocean variability beneath the Filchner‐Ronne Ice Shelf inferred from basal melt rate time series |
author_facet |
Vaňková, Irena Nicholls, Keith W. |
author_sort |
Vaňková, Irena |
title |
Ocean variability beneath the Filchner‐Ronne Ice Shelf inferred from basal melt rate time series |
title_short |
Ocean variability beneath the Filchner‐Ronne Ice Shelf inferred from basal melt rate time series |
title_full |
Ocean variability beneath the Filchner‐Ronne Ice Shelf inferred from basal melt rate time series |
title_fullStr |
Ocean variability beneath the Filchner‐Ronne Ice Shelf inferred from basal melt rate time series |
title_full_unstemmed |
Ocean variability beneath the Filchner‐Ronne Ice Shelf inferred from basal melt rate time series |
title_sort |
ocean variability beneath the filchner‐ronne ice shelf inferred from basal melt rate time series |
publisher |
American Geophysical Union |
publishDate |
2022 |
url |
http://nora.nerc.ac.uk/id/eprint/533320/ https://nora.nerc.ac.uk/id/eprint/533320/1/JGR%20Oceans%20-%202022%20-%20Va%20kov%20-%20Ocean%20Variability%20Beneath%20the%20Filchner%E2%80%90Ronne%20Ice%20Shelf%20Inferred%20From%20Basal%20Melt%20Rate%20Time.pdf https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2022JC018879 |
long_lat |
ENVELOPE(-61.000,-61.000,-78.500,-78.500) ENVELOPE(-48.117,-48.117,-79.333,-79.333) ENVELOPE(-55.000,-55.000,-76.000,-76.000) |
geographic |
Ronne Ice Shelf Berkner Island Ronne Ice Front |
geographic_facet |
Ronne Ice Shelf Berkner Island Ronne Ice Front |
genre |
Berkner Island Filchner Ronne Ice Shelf Filchner-Ronne Ice Shelf Ice Shelf Ronne Ice Shelf Sea ice |
genre_facet |
Berkner Island Filchner Ronne Ice Shelf Filchner-Ronne Ice Shelf Ice Shelf Ronne Ice Shelf Sea ice |
op_relation |
https://nora.nerc.ac.uk/id/eprint/533320/1/JGR%20Oceans%20-%202022%20-%20Va%20kov%20-%20Ocean%20Variability%20Beneath%20the%20Filchner%E2%80%90Ronne%20Ice%20Shelf%20Inferred%20From%20Basal%20Melt%20Rate%20Time.pdf Vaňková, Irena orcid:0000-0003-4351-3781 Nicholls, Keith W. orcid:0000-0002-2188-4509 . 2022 Ocean variability beneath the Filchner‐Ronne Ice Shelf inferred from basal melt rate time series. Journal of Geophysical Research: Oceans, 127 (10). 20, pp. https://doi.org/10.1029/2022JC018879 <https://doi.org/10.1029/2022JC018879> |
op_rights |
cc_by_4 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1029/2022JC018879 |
container_title |
Journal of Geophysical Research: Oceans |
container_volume |
127 |
container_issue |
10 |
_version_ |
1766378617148801024 |