Shear dispersion and delayed propagation of temperature anomalies along the Norwegian Atlantic Slope Current
Using satellite altimetric sea surface height (ADT) data, we search for propagation of hydrographic anomalies along the Norwegian Atlantic Slope Current (NwASC) from the Svinøy section in the south to the Fram Strait in the north. Our analyses indicate that ADT anomalies, related to low-frequency te...
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ftdoajarticles:oai:doaj.org/article:7afe00ff25374189bcc65d393288e177 2023-05-15T15:06:22+02:00 Shear dispersion and delayed propagation of temperature anomalies along the Norwegian Atlantic Slope Current Sara Broomé Johan Nilsson 2018-01-01T00:00:00Z https://doi.org/10.1080/16000870.2018.1453215 https://doaj.org/article/7afe00ff25374189bcc65d393288e177 EN eng Stockholm University Press http://dx.doi.org/10.1080/16000870.2018.1453215 https://doaj.org/toc/1600-0870 1600-0870 doi:10.1080/16000870.2018.1453215 https://doaj.org/article/7afe00ff25374189bcc65d393288e177 Tellus: Series A, Dynamic Meteorology and Oceanography, Vol 70, Iss 1, Pp 1-13 (2018) Nordic Seas propagation ocean heat anomalies towards the Arctic Ocean satellite altimetry shear dispersion and delayed propagation Oceanography GC1-1581 Meteorology. Climatology QC851-999 article 2018 ftdoajarticles https://doi.org/10.1080/16000870.2018.1453215 2022-12-30T22:22:35Z Using satellite altimetric sea surface height (ADT) data, we search for propagation of hydrographic anomalies along the Norwegian Atlantic Slope Current (NwASC) from the Svinøy section in the south to the Fram Strait in the north. Our analyses indicate that ADT anomalies, related to low-frequency temperature variations, propagate downstream with speeds of about 2 cm s$ ^{-1} $. Notably, this speed is nearly an order of magnitude slower than the speed of the NwASC, which in agreement with previously estimated propagation speeds of hydrographic anomalies along the flow. A conceptual tracer advection model, consisting of a thin current core interacting with an adjacent slow moving reservoir, is introduced to examine temperature anomaly propagation along the NwASC. It is shown that shear dispersion effects, resulting from cross-stream eddy mixing and velocity shear, can qualitatively explain the observed delayed propagation of hydrographic anomalies: low-frequency temperature anomalies move downstream with an effective velocity that corresponds to a mean velocity across the entire Atlantic Water layer, rather than the speed of Norwegian Atlantic Slope Current. Article in Journal/Newspaper Arctic Arctic Ocean Fram Strait Nordic Seas Directory of Open Access Journals: DOAJ Articles Arctic Arctic Ocean Svinøy ENVELOPE(10.992,10.992,64.866,64.866) Tellus A: Dynamic Meteorology and Oceanography 70 1 1 13 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Nordic Seas propagation ocean heat anomalies towards the Arctic Ocean satellite altimetry shear dispersion and delayed propagation Oceanography GC1-1581 Meteorology. Climatology QC851-999 |
spellingShingle |
Nordic Seas propagation ocean heat anomalies towards the Arctic Ocean satellite altimetry shear dispersion and delayed propagation Oceanography GC1-1581 Meteorology. Climatology QC851-999 Sara Broomé Johan Nilsson Shear dispersion and delayed propagation of temperature anomalies along the Norwegian Atlantic Slope Current |
topic_facet |
Nordic Seas propagation ocean heat anomalies towards the Arctic Ocean satellite altimetry shear dispersion and delayed propagation Oceanography GC1-1581 Meteorology. Climatology QC851-999 |
description |
Using satellite altimetric sea surface height (ADT) data, we search for propagation of hydrographic anomalies along the Norwegian Atlantic Slope Current (NwASC) from the Svinøy section in the south to the Fram Strait in the north. Our analyses indicate that ADT anomalies, related to low-frequency temperature variations, propagate downstream with speeds of about 2 cm s$ ^{-1} $. Notably, this speed is nearly an order of magnitude slower than the speed of the NwASC, which in agreement with previously estimated propagation speeds of hydrographic anomalies along the flow. A conceptual tracer advection model, consisting of a thin current core interacting with an adjacent slow moving reservoir, is introduced to examine temperature anomaly propagation along the NwASC. It is shown that shear dispersion effects, resulting from cross-stream eddy mixing and velocity shear, can qualitatively explain the observed delayed propagation of hydrographic anomalies: low-frequency temperature anomalies move downstream with an effective velocity that corresponds to a mean velocity across the entire Atlantic Water layer, rather than the speed of Norwegian Atlantic Slope Current. |
format |
Article in Journal/Newspaper |
author |
Sara Broomé Johan Nilsson |
author_facet |
Sara Broomé Johan Nilsson |
author_sort |
Sara Broomé |
title |
Shear dispersion and delayed propagation of temperature anomalies along the Norwegian Atlantic Slope Current |
title_short |
Shear dispersion and delayed propagation of temperature anomalies along the Norwegian Atlantic Slope Current |
title_full |
Shear dispersion and delayed propagation of temperature anomalies along the Norwegian Atlantic Slope Current |
title_fullStr |
Shear dispersion and delayed propagation of temperature anomalies along the Norwegian Atlantic Slope Current |
title_full_unstemmed |
Shear dispersion and delayed propagation of temperature anomalies along the Norwegian Atlantic Slope Current |
title_sort |
shear dispersion and delayed propagation of temperature anomalies along the norwegian atlantic slope current |
publisher |
Stockholm University Press |
publishDate |
2018 |
url |
https://doi.org/10.1080/16000870.2018.1453215 https://doaj.org/article/7afe00ff25374189bcc65d393288e177 |
long_lat |
ENVELOPE(10.992,10.992,64.866,64.866) |
geographic |
Arctic Arctic Ocean Svinøy |
geographic_facet |
Arctic Arctic Ocean Svinøy |
genre |
Arctic Arctic Ocean Fram Strait Nordic Seas |
genre_facet |
Arctic Arctic Ocean Fram Strait Nordic Seas |
op_source |
Tellus: Series A, Dynamic Meteorology and Oceanography, Vol 70, Iss 1, Pp 1-13 (2018) |
op_relation |
http://dx.doi.org/10.1080/16000870.2018.1453215 https://doaj.org/toc/1600-0870 1600-0870 doi:10.1080/16000870.2018.1453215 https://doaj.org/article/7afe00ff25374189bcc65d393288e177 |
op_doi |
https://doi.org/10.1080/16000870.2018.1453215 |
container_title |
Tellus A: Dynamic Meteorology and Oceanography |
container_volume |
70 |
container_issue |
1 |
container_start_page |
1 |
op_container_end_page |
13 |
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1766337996329582592 |