Atlantic Water Modification North of Svalbard in the Mercator Physical System From 2007 to 2020
The Atlantic Water (AW) inflow through Fram Strait, largest oceanic heat source to the Arctic Ocean, undergoes substantial modifications in the Western Nansen Basin (WNB). Evaluation of the Mercator system in the WNB, using 1,500 independent temperature‐salinity profiles and five years of mooring da...
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ftawi:oai:epic.awi.de:56493 2023-05-15T15:10:49+02:00 Atlantic Water Modification North of Svalbard in the Mercator Physical System From 2007 to 2020 Provost, Christine Athanase, Marylou Pérez-Hernández, Maria-Dolores Sennéchael, Nathalie Bertosio, Cécilia Artana, Camila Garric, Gilles Lellouche, Jean-Michel 2021 application/pdf https://epic.awi.de/id/eprint/56493/ https://epic.awi.de/id/eprint/56493/1/EGU21-9797_presentation.pdf https://doi.org/10.5194/egusphere-egu21-9797 https://hdl.handle.net/10013/epic.e0acb6b8-74e2-44d7-a90b-c7278bc34dc0 https://hdl.handle.net/ unknown EGU https://epic.awi.de/id/eprint/56493/1/EGU21-9797_presentation.pdf https://hdl.handle.net/ Provost, C. , Athanase, M. orcid:0000-0001-6603-9870 , Pérez-Hernández, M. D. , Sennéchael, N. , Bertosio, C. , Artana, C. , Garric, G. and Lellouche, J. M. (2021) Atlantic Water Modification North of Svalbard in the Mercator Physical System From 2007 to 2020 , EGU General Assembly, online, 2021 - unspecified . doi:10.5194/egusphere-egu21-9797 <https://doi.org/10.5194/egusphere-egu21-9797> , hdl:10013/epic.e0acb6b8-74e2-44d7-a90b-c7278bc34dc0 EPIC3EGU General Assembly, online, 2021Atlantic Water Modification North of Svalbard in the Mercator Physical System From 2007 to 2020 , EGU Conference NonPeerReviewed 2021 ftawi https://doi.org/10.5194/egusphere-egu21-9797 2022-07-10T23:12:19Z The Atlantic Water (AW) inflow through Fram Strait, largest oceanic heat source to the Arctic Ocean, undergoes substantial modifications in the Western Nansen Basin (WNB). Evaluation of the Mercator system in the WNB, using 1,500 independent temperature‐salinity profiles and five years of mooring data, highlighted its performance in representing realistic AW inflow and hydrographic properties. In particular, favorable comparisons with mooring time‐series documenting deep winter mixed layers and changes in AW properties led us to examine winter conditions in the WNB over the 2007–2020 period. The model helped describe the interannual variations of winter mixed layers and documented several processes at stake in modifying AW beyond winter convection: trough outflows and lateral exchange through vigorous eddies. Recently modified AW, either via local convection or trough outflows, were identified as homogeneous layers of low buoyancy frequency. Over the 2007–2020 period, two winters stood out with extreme deep mixed layers in areas that used to be ice‐covered: 2017/18 over the northern Yermak Plateau‐Sofia Deep; 2012/13 on the continental slope northeast of Svalbard with the coldest and freshest modified AW of the 12‐year time series. The northern Yermak Plateau‐Sofia Deep and continental slope areas became “Marginal Convection Zones” in 2011 with, from then on, occasionally ice‐free conditions, 50‐m‐ocean temperatures always above 0 °C and highly variable mixed layer depths and ocean‐to‐atmosphere heat fluxes. In the WNB where observations require considerable efforts and resources, the Mercator system proved to be a good tool to assess Atlantic Water modifications in winter. Conference Object Arctic Arctic Ocean Fram Strait Nansen Basin Svalbard Yermak plateau Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Arctic Arctic Ocean Svalbard Yermak Plateau ENVELOPE(5.000,5.000,81.250,81.250) |
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 |
The Atlantic Water (AW) inflow through Fram Strait, largest oceanic heat source to the Arctic Ocean, undergoes substantial modifications in the Western Nansen Basin (WNB). Evaluation of the Mercator system in the WNB, using 1,500 independent temperature‐salinity profiles and five years of mooring data, highlighted its performance in representing realistic AW inflow and hydrographic properties. In particular, favorable comparisons with mooring time‐series documenting deep winter mixed layers and changes in AW properties led us to examine winter conditions in the WNB over the 2007–2020 period. The model helped describe the interannual variations of winter mixed layers and documented several processes at stake in modifying AW beyond winter convection: trough outflows and lateral exchange through vigorous eddies. Recently modified AW, either via local convection or trough outflows, were identified as homogeneous layers of low buoyancy frequency. Over the 2007–2020 period, two winters stood out with extreme deep mixed layers in areas that used to be ice‐covered: 2017/18 over the northern Yermak Plateau‐Sofia Deep; 2012/13 on the continental slope northeast of Svalbard with the coldest and freshest modified AW of the 12‐year time series. The northern Yermak Plateau‐Sofia Deep and continental slope areas became “Marginal Convection Zones” in 2011 with, from then on, occasionally ice‐free conditions, 50‐m‐ocean temperatures always above 0 °C and highly variable mixed layer depths and ocean‐to‐atmosphere heat fluxes. In the WNB where observations require considerable efforts and resources, the Mercator system proved to be a good tool to assess Atlantic Water modifications in winter. |
format |
Conference Object |
author |
Provost, Christine Athanase, Marylou Pérez-Hernández, Maria-Dolores Sennéchael, Nathalie Bertosio, Cécilia Artana, Camila Garric, Gilles Lellouche, Jean-Michel |
spellingShingle |
Provost, Christine Athanase, Marylou Pérez-Hernández, Maria-Dolores Sennéchael, Nathalie Bertosio, Cécilia Artana, Camila Garric, Gilles Lellouche, Jean-Michel Atlantic Water Modification North of Svalbard in the Mercator Physical System From 2007 to 2020 |
author_facet |
Provost, Christine Athanase, Marylou Pérez-Hernández, Maria-Dolores Sennéchael, Nathalie Bertosio, Cécilia Artana, Camila Garric, Gilles Lellouche, Jean-Michel |
author_sort |
Provost, Christine |
title |
Atlantic Water Modification North of Svalbard in the Mercator Physical System From 2007 to 2020 |
title_short |
Atlantic Water Modification North of Svalbard in the Mercator Physical System From 2007 to 2020 |
title_full |
Atlantic Water Modification North of Svalbard in the Mercator Physical System From 2007 to 2020 |
title_fullStr |
Atlantic Water Modification North of Svalbard in the Mercator Physical System From 2007 to 2020 |
title_full_unstemmed |
Atlantic Water Modification North of Svalbard in the Mercator Physical System From 2007 to 2020 |
title_sort |
atlantic water modification north of svalbard in the mercator physical system from 2007 to 2020 |
publisher |
EGU |
publishDate |
2021 |
url |
https://epic.awi.de/id/eprint/56493/ https://epic.awi.de/id/eprint/56493/1/EGU21-9797_presentation.pdf https://doi.org/10.5194/egusphere-egu21-9797 https://hdl.handle.net/10013/epic.e0acb6b8-74e2-44d7-a90b-c7278bc34dc0 https://hdl.handle.net/ |
long_lat |
ENVELOPE(5.000,5.000,81.250,81.250) |
geographic |
Arctic Arctic Ocean Svalbard Yermak Plateau |
geographic_facet |
Arctic Arctic Ocean Svalbard Yermak Plateau |
genre |
Arctic Arctic Ocean Fram Strait Nansen Basin Svalbard Yermak plateau |
genre_facet |
Arctic Arctic Ocean Fram Strait Nansen Basin Svalbard Yermak plateau |
op_source |
EPIC3EGU General Assembly, online, 2021Atlantic Water Modification North of Svalbard in the Mercator Physical System From 2007 to 2020 , EGU |
op_relation |
https://epic.awi.de/id/eprint/56493/1/EGU21-9797_presentation.pdf https://hdl.handle.net/ Provost, C. , Athanase, M. orcid:0000-0001-6603-9870 , Pérez-Hernández, M. D. , Sennéchael, N. , Bertosio, C. , Artana, C. , Garric, G. and Lellouche, J. M. (2021) Atlantic Water Modification North of Svalbard in the Mercator Physical System From 2007 to 2020 , EGU General Assembly, online, 2021 - unspecified . doi:10.5194/egusphere-egu21-9797 <https://doi.org/10.5194/egusphere-egu21-9797> , hdl:10013/epic.e0acb6b8-74e2-44d7-a90b-c7278bc34dc0 |
op_doi |
https://doi.org/10.5194/egusphere-egu21-9797 |
_version_ |
1766341766943866880 |