Variability and decadal trends in the Isfjorden (Svalbard) ocean climate and circulation – An indicator for climate change in the European Arctic
Isfjorden, a broad Arctic fjord in western Spitsbergen, has shown significant changes in hydrography and inflow of Atlantic Water (AW) the last decades that only recently have been observed in the Arctic Ocean north of Svalbard. Variability and trends in this fjord’s climate and circulation are ther...
Published in: | Progress in Oceanography |
---|---|
Main Authors: | , , , , , , , , , , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
2020
|
Subjects: | |
Online Access: | https://pure.uhi.ac.uk/en/publications/5766bb84-fcea-4873-8a92-3682a7a22735 https://doi.org/10.1016/j.pocean.2020.102394 https://pureadmin.uhi.ac.uk/ws/files/14055549/1_s2.0_S0079661120301336_main.pdf https://linkinghub.elsevier.com/retrieve/pii/S0079661120301336 |
id |
ftuhipublicatio:oai:pure.atira.dk:publications/5766bb84-fcea-4873-8a92-3682a7a22735 |
---|---|
record_format |
openpolar |
spelling |
ftuhipublicatio:oai:pure.atira.dk:publications/5766bb84-fcea-4873-8a92-3682a7a22735 2024-09-15T17:51:27+00:00 Variability and decadal trends in the Isfjorden (Svalbard) ocean climate and circulation – An indicator for climate change in the European Arctic Skogseth, R. Olivier, L.l.a. Nilsen, F. Falck, E. Fraser, N. Tverberg, V. Ledang, A.b. Vader, A. Jonassen, M.o. Søreide, J. Cottier, F. Berge, J. Ivanov, B.v. Falk-petersen, S. 2020-08-01 application/pdf https://pure.uhi.ac.uk/en/publications/5766bb84-fcea-4873-8a92-3682a7a22735 https://doi.org/10.1016/j.pocean.2020.102394 https://pureadmin.uhi.ac.uk/ws/files/14055549/1_s2.0_S0079661120301336_main.pdf https://linkinghub.elsevier.com/retrieve/pii/S0079661120301336 eng eng https://pure.uhi.ac.uk/en/publications/5766bb84-fcea-4873-8a92-3682a7a22735 info:eu-repo/semantics/openAccess Skogseth , R , Olivier , L L A , Nilsen , F , Falck , E , Fraser , N , Tverberg , V , Ledang , A B , Vader , A , Jonassen , M O , Søreide , J , Cottier , F , Berge , J , Ivanov , B V & Falk-petersen , S 2020 , ' Variability and decadal trends in the Isfjorden (Svalbard) ocean climate and circulation – An indicator for climate change in the European Arctic ' , Progress in Oceanography , vol. 187 , 102394 . https://doi.org/10.1016/j.pocean.2020.102394 Oceanography TSD distribution water masses and circulation Ocean circulation and currents Nearshore dynamics Tides surges and sea level Atlantic Water intrusion Arctic Ocean Svalbard West Spitsbergen Shelf Isfjorden article 2020 ftuhipublicatio https://doi.org/10.1016/j.pocean.2020.102394 2024-08-12T23:37:04Z Isfjorden, a broad Arctic fjord in western Spitsbergen, has shown significant changes in hydrography and inflow of Atlantic Water (AW) the last decades that only recently have been observed in the Arctic Ocean north of Svalbard. Variability and trends in this fjord’s climate and circulation are therefore analysed from observational and reanalysis data during 1987 to 2017. Isfjorden experienced a shift in summer ocean structure in 2006, from AW generally in the bottom layer to AW (with increasing thickness) higher up in the water column. This shift, and a concomitant shift to less fast ice in Isfjorden are linked to positive trends in the mean sea surface temperature (SST) and volume weighted mean temperature (VT) in winter (SSTw/VTw: 0.7 ± 0.1/0.9 ± 0.3 °C 10 yr−1) and summer (SSTS/VTS: 0.7 ± 0.1/0.6 ± 0.1 °C 10 yr−1). Hence, the local mean air temperature shows similar trends in winter (1.9 ± 0.4 °C 10 yr−1) and summer (0.7 ± 0.1 °C 10 yr−1). Positive trends in volume weighted mean salinity in winter (0.21 ± 0.06 10 yr−1) and summer (0.07 ± 0.05 10 yr−1) suggest increased AW advection as a main reason for Isfjorden’s climate change. Local mean air temperature correlates significantly with sea ice cover, SST, and VT, revealing the fjord’s impact on the local terrestrial climate. In line with the shift in summer ocean structure, Isfjorden has changed from an Arctic type fjord dominated by Winter Deep and Winter Intermediate thermal and haline convection, to a fjord dominated by deep thermal convection of Atlantic type water (Winter Open). AW indexes for the mouth and Isfjorden proper show that AW influence has been common in winter over the last decade. Alternating occurrence of Arctic and Atlantic type water at the mouth mirrors the geostrophic control imposed by the Spitsbergen Polar Current (carrying Arctic Water) relative to the strength of the Spitsbergen Trough Current (carrying AW). During high AW impact events, Atlantic type water propagates into the fjord according to the cyclonic circulation along ... Article in Journal/Newspaper Arctic Arctic Ocean Climate change Isfjord* Isfjord* Isfjorden Isfjorden Sea ice Svalbard Spitsbergen University of the Highlands and Islands: Research Database of UHI Progress in Oceanography 187 102394 |
institution |
Open Polar |
collection |
University of the Highlands and Islands: Research Database of UHI |
op_collection_id |
ftuhipublicatio |
language |
English |
topic |
Oceanography TSD distribution water masses and circulation Ocean circulation and currents Nearshore dynamics Tides surges and sea level Atlantic Water intrusion Arctic Ocean Svalbard West Spitsbergen Shelf Isfjorden |
spellingShingle |
Oceanography TSD distribution water masses and circulation Ocean circulation and currents Nearshore dynamics Tides surges and sea level Atlantic Water intrusion Arctic Ocean Svalbard West Spitsbergen Shelf Isfjorden Skogseth, R. Olivier, L.l.a. Nilsen, F. Falck, E. Fraser, N. Tverberg, V. Ledang, A.b. Vader, A. Jonassen, M.o. Søreide, J. Cottier, F. Berge, J. Ivanov, B.v. Falk-petersen, S. Variability and decadal trends in the Isfjorden (Svalbard) ocean climate and circulation – An indicator for climate change in the European Arctic |
topic_facet |
Oceanography TSD distribution water masses and circulation Ocean circulation and currents Nearshore dynamics Tides surges and sea level Atlantic Water intrusion Arctic Ocean Svalbard West Spitsbergen Shelf Isfjorden |
description |
Isfjorden, a broad Arctic fjord in western Spitsbergen, has shown significant changes in hydrography and inflow of Atlantic Water (AW) the last decades that only recently have been observed in the Arctic Ocean north of Svalbard. Variability and trends in this fjord’s climate and circulation are therefore analysed from observational and reanalysis data during 1987 to 2017. Isfjorden experienced a shift in summer ocean structure in 2006, from AW generally in the bottom layer to AW (with increasing thickness) higher up in the water column. This shift, and a concomitant shift to less fast ice in Isfjorden are linked to positive trends in the mean sea surface temperature (SST) and volume weighted mean temperature (VT) in winter (SSTw/VTw: 0.7 ± 0.1/0.9 ± 0.3 °C 10 yr−1) and summer (SSTS/VTS: 0.7 ± 0.1/0.6 ± 0.1 °C 10 yr−1). Hence, the local mean air temperature shows similar trends in winter (1.9 ± 0.4 °C 10 yr−1) and summer (0.7 ± 0.1 °C 10 yr−1). Positive trends in volume weighted mean salinity in winter (0.21 ± 0.06 10 yr−1) and summer (0.07 ± 0.05 10 yr−1) suggest increased AW advection as a main reason for Isfjorden’s climate change. Local mean air temperature correlates significantly with sea ice cover, SST, and VT, revealing the fjord’s impact on the local terrestrial climate. In line with the shift in summer ocean structure, Isfjorden has changed from an Arctic type fjord dominated by Winter Deep and Winter Intermediate thermal and haline convection, to a fjord dominated by deep thermal convection of Atlantic type water (Winter Open). AW indexes for the mouth and Isfjorden proper show that AW influence has been common in winter over the last decade. Alternating occurrence of Arctic and Atlantic type water at the mouth mirrors the geostrophic control imposed by the Spitsbergen Polar Current (carrying Arctic Water) relative to the strength of the Spitsbergen Trough Current (carrying AW). During high AW impact events, Atlantic type water propagates into the fjord according to the cyclonic circulation along ... |
format |
Article in Journal/Newspaper |
author |
Skogseth, R. Olivier, L.l.a. Nilsen, F. Falck, E. Fraser, N. Tverberg, V. Ledang, A.b. Vader, A. Jonassen, M.o. Søreide, J. Cottier, F. Berge, J. Ivanov, B.v. Falk-petersen, S. |
author_facet |
Skogseth, R. Olivier, L.l.a. Nilsen, F. Falck, E. Fraser, N. Tverberg, V. Ledang, A.b. Vader, A. Jonassen, M.o. Søreide, J. Cottier, F. Berge, J. Ivanov, B.v. Falk-petersen, S. |
author_sort |
Skogseth, R. |
title |
Variability and decadal trends in the Isfjorden (Svalbard) ocean climate and circulation – An indicator for climate change in the European Arctic |
title_short |
Variability and decadal trends in the Isfjorden (Svalbard) ocean climate and circulation – An indicator for climate change in the European Arctic |
title_full |
Variability and decadal trends in the Isfjorden (Svalbard) ocean climate and circulation – An indicator for climate change in the European Arctic |
title_fullStr |
Variability and decadal trends in the Isfjorden (Svalbard) ocean climate and circulation – An indicator for climate change in the European Arctic |
title_full_unstemmed |
Variability and decadal trends in the Isfjorden (Svalbard) ocean climate and circulation – An indicator for climate change in the European Arctic |
title_sort |
variability and decadal trends in the isfjorden (svalbard) ocean climate and circulation – an indicator for climate change in the european arctic |
publishDate |
2020 |
url |
https://pure.uhi.ac.uk/en/publications/5766bb84-fcea-4873-8a92-3682a7a22735 https://doi.org/10.1016/j.pocean.2020.102394 https://pureadmin.uhi.ac.uk/ws/files/14055549/1_s2.0_S0079661120301336_main.pdf https://linkinghub.elsevier.com/retrieve/pii/S0079661120301336 |
genre |
Arctic Arctic Ocean Climate change Isfjord* Isfjord* Isfjorden Isfjorden Sea ice Svalbard Spitsbergen |
genre_facet |
Arctic Arctic Ocean Climate change Isfjord* Isfjord* Isfjorden Isfjorden Sea ice Svalbard Spitsbergen |
op_source |
Skogseth , R , Olivier , L L A , Nilsen , F , Falck , E , Fraser , N , Tverberg , V , Ledang , A B , Vader , A , Jonassen , M O , Søreide , J , Cottier , F , Berge , J , Ivanov , B V & Falk-petersen , S 2020 , ' Variability and decadal trends in the Isfjorden (Svalbard) ocean climate and circulation – An indicator for climate change in the European Arctic ' , Progress in Oceanography , vol. 187 , 102394 . https://doi.org/10.1016/j.pocean.2020.102394 |
op_relation |
https://pure.uhi.ac.uk/en/publications/5766bb84-fcea-4873-8a92-3682a7a22735 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1016/j.pocean.2020.102394 |
container_title |
Progress in Oceanography |
container_volume |
187 |
container_start_page |
102394 |
_version_ |
1810293352328855552 |