Exceptionally Warm and Prolonged Flow of Warm Deep Water Toward the Filchner‐Ronne Ice Shelf in 2017
The Filchner-Ronne Ice Shelf, fringing the southern Weddell Sea, is Antarctica's second largest ice shelf. At present, basal melt rates are low due to active dense water formation; however, model projections suggest a drastic increase in the future due to enhanced inflow of open-ocean warm wate...
Published in: | Geophysical Research Letters |
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Online Access: | https://hdl.handle.net/11250/2766143 https://doi.org/10.1029/2020GL088119 |
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ftunivbergen:oai:bora.uib.no:11250/2766143 2023-05-15T14:00:04+02:00 Exceptionally Warm and Prolonged Flow of Warm Deep Water Toward the Filchner‐Ronne Ice Shelf in 2017 Ryan, Svenja Hellmer, Hartmut H. Janout, Markus Darelius, Elin Maria K. Schröder, Michael Vignes, Lucie 2020 application/pdf https://hdl.handle.net/11250/2766143 https://doi.org/10.1029/2020GL088119 eng eng Wiley Norges forskningsråd: 267660 urn:issn:0094-8276 https://hdl.handle.net/11250/2766143 https://doi.org/10.1029/2020GL088119 cristin:1818794 Geophysical Research Letters. 2020, 47 (13), e2020GL088119. Navngivelse 4.0 Internasjonal http://creativecommons.org/licenses/by/4.0/deed.no Copyright 2020. The Authors e2020GL088119 Geophysical Research Letters 47 13 VDP::Oseanografi: 452 VDP::Oceanography: 452 Journal article Peer reviewed 2020 ftunivbergen https://doi.org/10.1029/2020GL088119 2023-03-14T17:40:32Z The Filchner-Ronne Ice Shelf, fringing the southern Weddell Sea, is Antarctica's second largest ice shelf. At present, basal melt rates are low due to active dense water formation; however, model projections suggest a drastic increase in the future due to enhanced inflow of open-ocean warm water. Mooring observations from 2014 to 2016 along the eastern flank of the Filchner Trough (76°S) revealed a distinct seasonal cycle with inflow if Warm Deep Water during summer and autumn. Here we present extended time series showing an exceptionally warm and long inflow in 2017, with maximum temperatures exceeding 0.5°C. Warm temperatures persisted throughout winter, associated with a fresh anomaly, which lead to a change in stratification over the shelf, favoring an earlier inflow in the following summer. We suggest that the fresh anomaly developed upstream after anomalous summer sea ice melting and contributed to a shoaling of the shelf break thermocline. publishedVersion Article in Journal/Newspaper Antarc* Filchner Ronne Ice Shelf Filchner-Ronne Ice Shelf Ice Shelf Ronne Ice Shelf Sea ice Weddell Sea University of Bergen: Bergen Open Research Archive (BORA-UiB) Filchner Trough ENVELOPE(-36.000,-36.000,-77.000,-77.000) Ronne Ice Shelf ENVELOPE(-61.000,-61.000,-78.500,-78.500) Weddell Weddell Sea Geophysical Research Letters 47 13 |
institution |
Open Polar |
collection |
University of Bergen: Bergen Open Research Archive (BORA-UiB) |
op_collection_id |
ftunivbergen |
language |
English |
topic |
VDP::Oseanografi: 452 VDP::Oceanography: 452 |
spellingShingle |
VDP::Oseanografi: 452 VDP::Oceanography: 452 Ryan, Svenja Hellmer, Hartmut H. Janout, Markus Darelius, Elin Maria K. Schröder, Michael Vignes, Lucie Exceptionally Warm and Prolonged Flow of Warm Deep Water Toward the Filchner‐Ronne Ice Shelf in 2017 |
topic_facet |
VDP::Oseanografi: 452 VDP::Oceanography: 452 |
description |
The Filchner-Ronne Ice Shelf, fringing the southern Weddell Sea, is Antarctica's second largest ice shelf. At present, basal melt rates are low due to active dense water formation; however, model projections suggest a drastic increase in the future due to enhanced inflow of open-ocean warm water. Mooring observations from 2014 to 2016 along the eastern flank of the Filchner Trough (76°S) revealed a distinct seasonal cycle with inflow if Warm Deep Water during summer and autumn. Here we present extended time series showing an exceptionally warm and long inflow in 2017, with maximum temperatures exceeding 0.5°C. Warm temperatures persisted throughout winter, associated with a fresh anomaly, which lead to a change in stratification over the shelf, favoring an earlier inflow in the following summer. We suggest that the fresh anomaly developed upstream after anomalous summer sea ice melting and contributed to a shoaling of the shelf break thermocline. publishedVersion |
format |
Article in Journal/Newspaper |
author |
Ryan, Svenja Hellmer, Hartmut H. Janout, Markus Darelius, Elin Maria K. Schröder, Michael Vignes, Lucie |
author_facet |
Ryan, Svenja Hellmer, Hartmut H. Janout, Markus Darelius, Elin Maria K. Schröder, Michael Vignes, Lucie |
author_sort |
Ryan, Svenja |
title |
Exceptionally Warm and Prolonged Flow of Warm Deep Water Toward the Filchner‐Ronne Ice Shelf in 2017 |
title_short |
Exceptionally Warm and Prolonged Flow of Warm Deep Water Toward the Filchner‐Ronne Ice Shelf in 2017 |
title_full |
Exceptionally Warm and Prolonged Flow of Warm Deep Water Toward the Filchner‐Ronne Ice Shelf in 2017 |
title_fullStr |
Exceptionally Warm and Prolonged Flow of Warm Deep Water Toward the Filchner‐Ronne Ice Shelf in 2017 |
title_full_unstemmed |
Exceptionally Warm and Prolonged Flow of Warm Deep Water Toward the Filchner‐Ronne Ice Shelf in 2017 |
title_sort |
exceptionally warm and prolonged flow of warm deep water toward the filchner‐ronne ice shelf in 2017 |
publisher |
Wiley |
publishDate |
2020 |
url |
https://hdl.handle.net/11250/2766143 https://doi.org/10.1029/2020GL088119 |
long_lat |
ENVELOPE(-36.000,-36.000,-77.000,-77.000) ENVELOPE(-61.000,-61.000,-78.500,-78.500) |
geographic |
Filchner Trough Ronne Ice Shelf Weddell Weddell Sea |
geographic_facet |
Filchner Trough Ronne Ice Shelf Weddell Weddell Sea |
genre |
Antarc* Filchner Ronne Ice Shelf Filchner-Ronne Ice Shelf Ice Shelf Ronne Ice Shelf Sea ice Weddell Sea |
genre_facet |
Antarc* Filchner Ronne Ice Shelf Filchner-Ronne Ice Shelf Ice Shelf Ronne Ice Shelf Sea ice Weddell Sea |
op_source |
e2020GL088119 Geophysical Research Letters 47 13 |
op_relation |
Norges forskningsråd: 267660 urn:issn:0094-8276 https://hdl.handle.net/11250/2766143 https://doi.org/10.1029/2020GL088119 cristin:1818794 Geophysical Research Letters. 2020, 47 (13), e2020GL088119. |
op_rights |
Navngivelse 4.0 Internasjonal http://creativecommons.org/licenses/by/4.0/deed.no Copyright 2020. The Authors |
op_doi |
https://doi.org/10.1029/2020GL088119 |
container_title |
Geophysical Research Letters |
container_volume |
47 |
container_issue |
13 |
_version_ |
1766269053576413184 |