Structure and formation of anticyclonic eddies in the Iceland Basin
Author Posting. © American Geophysical Union, 2018. This article is posted here by permission of [publisher] for personal use, not for redistribution. The definitive version was published in Journal of Geophysical Research: Oceans 123 (2018): 5341-5359, doi:10.1029/2018JC013886. The Iceland Basin ha...
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ftwhoas:oai:darchive.mblwhoilibrary.org:1912/10659 2023-05-15T16:45:39+02:00 Structure and formation of anticyclonic eddies in the Iceland Basin Zhao, Jian Bower, Amy S. Yang, Jiayan Lin, Xiaopei Zhou, Chun 2018-08-08 https://hdl.handle.net/1912/10659 en_US eng John Wiley & Sons https://doi.org/10.1029/2018JC013886 Journal of Geophysical Research: Oceans 123 (2018): 5341-5359 https://hdl.handle.net/1912/10659 doi:10.1029/2018JC013886 Journal of Geophysical Research: Oceans 123 (2018): 5341-5359 doi:10.1029/2018JC013886 Eddy Iceland Basin Instability Article 2018 ftwhoas https://doi.org/10.1029/2018JC013886 2022-05-28T23:00:30Z Author Posting. © American Geophysical Union, 2018. This article is posted here by permission of [publisher] for personal use, not for redistribution. The definitive version was published in Journal of Geophysical Research: Oceans 123 (2018): 5341-5359, doi:10.1029/2018JC013886. The Iceland Basin has the most energetic eddy activities in the subpolar North Atlantic. This study documents the structure for an anticyclonic eddy in the Iceland Basin using high‐resolution hydrographic and velocity observations. The eddy core waters have lens‐like structure with warm and salty features in the upper 1,000 m. The eddy distorts the density surface by doming the upper isopycnals and deepening the ones near the permanent pycnocline. The eddy has a diameter of about 120 km with substantial barotropic component in the velocity profiles. One branch of the North Atlantic Current in the central Iceland Basin is superimposed onto the eddy, leading to asymmetric velocity structure. Satellite maps show that eddy first shows up over the western slope of the Hatton Bank and moves westward to the central Iceland Basin. The waters enclosed in the eddy core share the same properties with Subpolar Mode Waters. Similar anticyclonic eddies are also found in high‐resolution numerical model simulations, which is used to explore eddy formation. The model results reveal that the potential vorticity gradient prior to the eddy event change signs in both horizontal and vertical directions. This potential vorticity gradient structure meets the necessary condition for the barotropic and baroclinic instabilities. Further calculation of the energy conversions suggests that eddies extract mean potential energy from the large‐scale isopycnal slope and gain the mean kinetic energy in the upper ocean. Therefore, both barotropic and baroclinic instabilities are involved to support the eddy growth. Fundamental Research Funds for the Central Universities Grant Numbers: 201362048, 201424001; China's National Key Research and Development Projects Grant ... Article in Journal/Newspaper Iceland north atlantic current North Atlantic Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) Hatton Bank ENVELOPE(-18.000,-18.000,58.583,58.583) Journal of Geophysical Research: Oceans 123 8 5341 5359 |
institution |
Open Polar |
collection |
Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) |
op_collection_id |
ftwhoas |
language |
English |
topic |
Eddy Iceland Basin Instability |
spellingShingle |
Eddy Iceland Basin Instability Zhao, Jian Bower, Amy S. Yang, Jiayan Lin, Xiaopei Zhou, Chun Structure and formation of anticyclonic eddies in the Iceland Basin |
topic_facet |
Eddy Iceland Basin Instability |
description |
Author Posting. © American Geophysical Union, 2018. This article is posted here by permission of [publisher] for personal use, not for redistribution. The definitive version was published in Journal of Geophysical Research: Oceans 123 (2018): 5341-5359, doi:10.1029/2018JC013886. The Iceland Basin has the most energetic eddy activities in the subpolar North Atlantic. This study documents the structure for an anticyclonic eddy in the Iceland Basin using high‐resolution hydrographic and velocity observations. The eddy core waters have lens‐like structure with warm and salty features in the upper 1,000 m. The eddy distorts the density surface by doming the upper isopycnals and deepening the ones near the permanent pycnocline. The eddy has a diameter of about 120 km with substantial barotropic component in the velocity profiles. One branch of the North Atlantic Current in the central Iceland Basin is superimposed onto the eddy, leading to asymmetric velocity structure. Satellite maps show that eddy first shows up over the western slope of the Hatton Bank and moves westward to the central Iceland Basin. The waters enclosed in the eddy core share the same properties with Subpolar Mode Waters. Similar anticyclonic eddies are also found in high‐resolution numerical model simulations, which is used to explore eddy formation. The model results reveal that the potential vorticity gradient prior to the eddy event change signs in both horizontal and vertical directions. This potential vorticity gradient structure meets the necessary condition for the barotropic and baroclinic instabilities. Further calculation of the energy conversions suggests that eddies extract mean potential energy from the large‐scale isopycnal slope and gain the mean kinetic energy in the upper ocean. Therefore, both barotropic and baroclinic instabilities are involved to support the eddy growth. Fundamental Research Funds for the Central Universities Grant Numbers: 201362048, 201424001; China's National Key Research and Development Projects Grant ... |
format |
Article in Journal/Newspaper |
author |
Zhao, Jian Bower, Amy S. Yang, Jiayan Lin, Xiaopei Zhou, Chun |
author_facet |
Zhao, Jian Bower, Amy S. Yang, Jiayan Lin, Xiaopei Zhou, Chun |
author_sort |
Zhao, Jian |
title |
Structure and formation of anticyclonic eddies in the Iceland Basin |
title_short |
Structure and formation of anticyclonic eddies in the Iceland Basin |
title_full |
Structure and formation of anticyclonic eddies in the Iceland Basin |
title_fullStr |
Structure and formation of anticyclonic eddies in the Iceland Basin |
title_full_unstemmed |
Structure and formation of anticyclonic eddies in the Iceland Basin |
title_sort |
structure and formation of anticyclonic eddies in the iceland basin |
publisher |
John Wiley & Sons |
publishDate |
2018 |
url |
https://hdl.handle.net/1912/10659 |
long_lat |
ENVELOPE(-18.000,-18.000,58.583,58.583) |
geographic |
Hatton Bank |
geographic_facet |
Hatton Bank |
genre |
Iceland north atlantic current North Atlantic |
genre_facet |
Iceland north atlantic current North Atlantic |
op_source |
Journal of Geophysical Research: Oceans 123 (2018): 5341-5359 doi:10.1029/2018JC013886 |
op_relation |
https://doi.org/10.1029/2018JC013886 Journal of Geophysical Research: Oceans 123 (2018): 5341-5359 https://hdl.handle.net/1912/10659 doi:10.1029/2018JC013886 |
op_doi |
https://doi.org/10.1029/2018JC013886 |
container_title |
Journal of Geophysical Research: Oceans |
container_volume |
123 |
container_issue |
8 |
container_start_page |
5341 |
op_container_end_page |
5359 |
_version_ |
1766035806130012160 |