Basal Melt and Freezing Rates From First Noble Gas Samples Beneath an Ice Shelf
A climatically-induced acceleration in ocean-driven melting of Antarctic ice shelves would have consequences for both the discharge of continental ice into the ocean and thus global sea level, and for the formation of Antarctic Bottom Water and the oceanic meridional overturning circulation. Using a...
Published in: | Geophysical Research Letters |
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ftawi:oai:epic.awi.de:48120 2023-05-15T13:45:21+02:00 Basal Melt and Freezing Rates From First Noble Gas Samples Beneath an Ice Shelf Huhn, Oliver Hattermann, Tore Davis, Peter E. D. Dunker, Erich Hellmer, Hartmut H. Nicholls, Keith W. Østerhus, Svein Rhein, Monika Schröder, Michael Sültenfuß, Jürgen 2018 application/pdf https://epic.awi.de/id/eprint/48120/ https://epic.awi.de/id/eprint/48120/1/2018GL079706%281%29.pdf https://doi.org/10.1029/2018GL079706 https://hdl.handle.net/10013/epic.ea8f80fe-1b12-433e-8cad-88e3aa2b6dbe https://hdl.handle.net/ unknown Wiley https://epic.awi.de/id/eprint/48120/1/2018GL079706%281%29.pdf https://hdl.handle.net/ Huhn, O. , Hattermann, T. , Davis, P. E. D. , Dunker, E. , Hellmer, H. H. orcid:0000-0002-9357-9853 , Nicholls, K. W. , Østerhus, S. , Rhein, M. , Schröder, M. and Sültenfuß, J. (2018) Basal Melt and Freezing Rates From First Noble Gas Samples Beneath an Ice Shelf , Geophysical Research Letters, 45 (16), pp. 8455-8461 . doi:10.1029/2018GL079706 <https://doi.org/10.1029/2018GL079706> , hdl:10013/epic.ea8f80fe-1b12-433e-8cad-88e3aa2b6dbe EPIC3Geophysical Research Letters, Wiley, 45(16), pp. 8455-8461, ISSN: 00948276 Article isiRev 2018 ftawi https://doi.org/10.1029/2018GL079706 2021-12-24T15:44:11Z A climatically-induced acceleration in ocean-driven melting of Antarctic ice shelves would have consequences for both the discharge of continental ice into the ocean and thus global sea level, and for the formation of Antarctic Bottom Water and the oceanic meridional overturning circulation. Using a novel gas-tight in-situ water sampler, noble gas samples have been collected from six locations beneath the Filchner Ice Shelf, the first such samples from beneath an Antarctic Ice shelf. Helium and neon are uniquely suited as tracers of glacial meltwater in the ocean. Basal meltwater fractions range from 3.6% near the ice shelf base to 0.5% near the sea floor, with distinct regional differences. We estimate an average basal melt rate for the Filchner-Ronne Ice Shelf of 177 ± 95 Gt/year, independently confirming previous results. We calculate that up to 2.7% of the meltwater has been refrozen, and we identify a local source of crustal helium. Article in Journal/Newspaper Antarc* Antarctic Filchner Ronne Ice Shelf Filchner-Ronne Ice Shelf Ice Shelf Ice Shelves Ronne Ice Shelf Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Antarctic Filchner Ice Shelf ENVELOPE(-40.000,-40.000,-79.000,-79.000) Ronne Ice Shelf ENVELOPE(-61.000,-61.000,-78.500,-78.500) Geophysical Research Letters 45 16 8455 8461 |
institution |
Open Polar |
collection |
Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
op_collection_id |
ftawi |
language |
unknown |
description |
A climatically-induced acceleration in ocean-driven melting of Antarctic ice shelves would have consequences for both the discharge of continental ice into the ocean and thus global sea level, and for the formation of Antarctic Bottom Water and the oceanic meridional overturning circulation. Using a novel gas-tight in-situ water sampler, noble gas samples have been collected from six locations beneath the Filchner Ice Shelf, the first such samples from beneath an Antarctic Ice shelf. Helium and neon are uniquely suited as tracers of glacial meltwater in the ocean. Basal meltwater fractions range from 3.6% near the ice shelf base to 0.5% near the sea floor, with distinct regional differences. We estimate an average basal melt rate for the Filchner-Ronne Ice Shelf of 177 ± 95 Gt/year, independently confirming previous results. We calculate that up to 2.7% of the meltwater has been refrozen, and we identify a local source of crustal helium. |
format |
Article in Journal/Newspaper |
author |
Huhn, Oliver Hattermann, Tore Davis, Peter E. D. Dunker, Erich Hellmer, Hartmut H. Nicholls, Keith W. Østerhus, Svein Rhein, Monika Schröder, Michael Sültenfuß, Jürgen |
spellingShingle |
Huhn, Oliver Hattermann, Tore Davis, Peter E. D. Dunker, Erich Hellmer, Hartmut H. Nicholls, Keith W. Østerhus, Svein Rhein, Monika Schröder, Michael Sültenfuß, Jürgen Basal Melt and Freezing Rates From First Noble Gas Samples Beneath an Ice Shelf |
author_facet |
Huhn, Oliver Hattermann, Tore Davis, Peter E. D. Dunker, Erich Hellmer, Hartmut H. Nicholls, Keith W. Østerhus, Svein Rhein, Monika Schröder, Michael Sültenfuß, Jürgen |
author_sort |
Huhn, Oliver |
title |
Basal Melt and Freezing Rates From First Noble Gas Samples Beneath an Ice Shelf |
title_short |
Basal Melt and Freezing Rates From First Noble Gas Samples Beneath an Ice Shelf |
title_full |
Basal Melt and Freezing Rates From First Noble Gas Samples Beneath an Ice Shelf |
title_fullStr |
Basal Melt and Freezing Rates From First Noble Gas Samples Beneath an Ice Shelf |
title_full_unstemmed |
Basal Melt and Freezing Rates From First Noble Gas Samples Beneath an Ice Shelf |
title_sort |
basal melt and freezing rates from first noble gas samples beneath an ice shelf |
publisher |
Wiley |
publishDate |
2018 |
url |
https://epic.awi.de/id/eprint/48120/ https://epic.awi.de/id/eprint/48120/1/2018GL079706%281%29.pdf https://doi.org/10.1029/2018GL079706 https://hdl.handle.net/10013/epic.ea8f80fe-1b12-433e-8cad-88e3aa2b6dbe https://hdl.handle.net/ |
long_lat |
ENVELOPE(-40.000,-40.000,-79.000,-79.000) ENVELOPE(-61.000,-61.000,-78.500,-78.500) |
geographic |
Antarctic Filchner Ice Shelf Ronne Ice Shelf |
geographic_facet |
Antarctic Filchner Ice Shelf Ronne Ice Shelf |
genre |
Antarc* Antarctic Filchner Ronne Ice Shelf Filchner-Ronne Ice Shelf Ice Shelf Ice Shelves Ronne Ice Shelf |
genre_facet |
Antarc* Antarctic Filchner Ronne Ice Shelf Filchner-Ronne Ice Shelf Ice Shelf Ice Shelves Ronne Ice Shelf |
op_source |
EPIC3Geophysical Research Letters, Wiley, 45(16), pp. 8455-8461, ISSN: 00948276 |
op_relation |
https://epic.awi.de/id/eprint/48120/1/2018GL079706%281%29.pdf https://hdl.handle.net/ Huhn, O. , Hattermann, T. , Davis, P. E. D. , Dunker, E. , Hellmer, H. H. orcid:0000-0002-9357-9853 , Nicholls, K. W. , Østerhus, S. , Rhein, M. , Schröder, M. and Sültenfuß, J. (2018) Basal Melt and Freezing Rates From First Noble Gas Samples Beneath an Ice Shelf , Geophysical Research Letters, 45 (16), pp. 8455-8461 . doi:10.1029/2018GL079706 <https://doi.org/10.1029/2018GL079706> , hdl:10013/epic.ea8f80fe-1b12-433e-8cad-88e3aa2b6dbe |
op_doi |
https://doi.org/10.1029/2018GL079706 |
container_title |
Geophysical Research Letters |
container_volume |
45 |
container_issue |
16 |
container_start_page |
8455 |
op_container_end_page |
8461 |
_version_ |
1766221359142141952 |