Cyclonic Eddies in the West Greenland Boundary Current System
Author Posting. © American Meteorological Society, 2021. This article is posted here by permission of American Meteorological Society for personal use, not for redistribution. The definitive version was published in Journal of Physical Oceanography 51(7), (2021): 2087–2102, https://doi.org/10.1175/J...
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ftwhoas:oai:darchive.mblwhoilibrary.org:1912/27639 2023-05-15T15:51:49+02:00 Cyclonic Eddies in the West Greenland Boundary Current System Pacini, Astrid Pickart, Robert S. Le Bras, Isabela A. Straneo, Fiamma Holliday, Naomi Penny Spall, Michael A. 2021-06-08 https://hdl.handle.net/1912/27639 unknown American Meteorological Society https://doi.org/10.1175/JPO-D-20-0255.1 Pacini, A., Pickart, R. S., Le Bras, I. A., Straneo, F., Holliday, N. P., & Spall, M. A. (2021). Cyclonic Eddies in the West Greenland Boundary Current System. Journal of Physical Oceanography, 51(7), 2087–2102. https://hdl.handle.net/1912/27639 doi:10.1175/JPO-D-20-0255.1 Pacini, A., Pickart, R. S., Le Bras, I. A., Straneo, F., Holliday, N. P., & Spall, M. A. (2021). Cyclonic Eddies in the West Greenland Boundary Current System. Journal of Physical Oceanography, 51(7), 2087–2102. doi:10.1175/JPO-D-20-0255.1 Boundary currents Eddies Transport Article 2021 ftwhoas https://doi.org/10.1175/JPO-D-20-0255.1 2022-05-28T23:04:19Z Author Posting. © American Meteorological Society, 2021. This article is posted here by permission of American Meteorological Society for personal use, not for redistribution. The definitive version was published in Journal of Physical Oceanography 51(7), (2021): 2087–2102, https://doi.org/10.1175/JPO-D-20-0255.1. The boundary current system in the Labrador Sea plays an integral role in modulating convection in the interior basin. Four years of mooring data from the eastern Labrador Sea reveal persistent mesoscale variability in the West Greenland boundary current. Between 2014 and 2018, 197 middepth intensified cyclones were identified that passed the array near the 2000-m isobath. In this study, we quantify these features and show that they are the downstream manifestation of Denmark Strait Overflow Water (DSOW) cyclones. A composite cyclone is constructed revealing an average radius of 9 km, maximum azimuthal speed of 24 cm s−1, and a core propagation velocity of 27 cm s−1. The core propagation velocity is significantly smaller than upstream near Denmark Strait, allowing them to trap more water. The cyclones transport a 200-m-thick lens of dense water at the bottom of the water column and increase the transport of DSOW in the West Greenland boundary current by 17% relative to the background flow. Only a portion of the features generated at Denmark Strait make it to the Labrador Sea, implying that the remainder are shed into the interior Irminger Sea, are retroflected at Cape Farewell, or dissipate. A synoptic shipboard survey east of Cape Farewell, conducted in summer 2020, captured two of these features that shed further light on their structure and timing. This is the first time DSOW cyclones have been observed in the Labrador Sea—a discovery that could have important implications for interior stratification. A. P. and R. S. P. were funded by National Science Foundation Grants OCE-1259618 and OCE-1756361. I. L. B. and F. S. were funded by National Science Foundation Grants OCE-1258823 and OCE-1756272. ... Article in Journal/Newspaper Cape Farewell Denmark Strait Greenland Labrador Sea Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) Greenland Irminger Sea ENVELOPE(-34.041,-34.041,63.054,63.054) Journal of Physical Oceanography |
institution |
Open Polar |
collection |
Woods Hole Scientific Community: WHOAS (Woods Hole Open Access Server) |
op_collection_id |
ftwhoas |
language |
unknown |
topic |
Boundary currents Eddies Transport |
spellingShingle |
Boundary currents Eddies Transport Pacini, Astrid Pickart, Robert S. Le Bras, Isabela A. Straneo, Fiamma Holliday, Naomi Penny Spall, Michael A. Cyclonic Eddies in the West Greenland Boundary Current System |
topic_facet |
Boundary currents Eddies Transport |
description |
Author Posting. © American Meteorological Society, 2021. This article is posted here by permission of American Meteorological Society for personal use, not for redistribution. The definitive version was published in Journal of Physical Oceanography 51(7), (2021): 2087–2102, https://doi.org/10.1175/JPO-D-20-0255.1. The boundary current system in the Labrador Sea plays an integral role in modulating convection in the interior basin. Four years of mooring data from the eastern Labrador Sea reveal persistent mesoscale variability in the West Greenland boundary current. Between 2014 and 2018, 197 middepth intensified cyclones were identified that passed the array near the 2000-m isobath. In this study, we quantify these features and show that they are the downstream manifestation of Denmark Strait Overflow Water (DSOW) cyclones. A composite cyclone is constructed revealing an average radius of 9 km, maximum azimuthal speed of 24 cm s−1, and a core propagation velocity of 27 cm s−1. The core propagation velocity is significantly smaller than upstream near Denmark Strait, allowing them to trap more water. The cyclones transport a 200-m-thick lens of dense water at the bottom of the water column and increase the transport of DSOW in the West Greenland boundary current by 17% relative to the background flow. Only a portion of the features generated at Denmark Strait make it to the Labrador Sea, implying that the remainder are shed into the interior Irminger Sea, are retroflected at Cape Farewell, or dissipate. A synoptic shipboard survey east of Cape Farewell, conducted in summer 2020, captured two of these features that shed further light on their structure and timing. This is the first time DSOW cyclones have been observed in the Labrador Sea—a discovery that could have important implications for interior stratification. A. P. and R. S. P. were funded by National Science Foundation Grants OCE-1259618 and OCE-1756361. I. L. B. and F. S. were funded by National Science Foundation Grants OCE-1258823 and OCE-1756272. ... |
format |
Article in Journal/Newspaper |
author |
Pacini, Astrid Pickart, Robert S. Le Bras, Isabela A. Straneo, Fiamma Holliday, Naomi Penny Spall, Michael A. |
author_facet |
Pacini, Astrid Pickart, Robert S. Le Bras, Isabela A. Straneo, Fiamma Holliday, Naomi Penny Spall, Michael A. |
author_sort |
Pacini, Astrid |
title |
Cyclonic Eddies in the West Greenland Boundary Current System |
title_short |
Cyclonic Eddies in the West Greenland Boundary Current System |
title_full |
Cyclonic Eddies in the West Greenland Boundary Current System |
title_fullStr |
Cyclonic Eddies in the West Greenland Boundary Current System |
title_full_unstemmed |
Cyclonic Eddies in the West Greenland Boundary Current System |
title_sort |
cyclonic eddies in the west greenland boundary current system |
publisher |
American Meteorological Society |
publishDate |
2021 |
url |
https://hdl.handle.net/1912/27639 |
long_lat |
ENVELOPE(-34.041,-34.041,63.054,63.054) |
geographic |
Greenland Irminger Sea |
geographic_facet |
Greenland Irminger Sea |
genre |
Cape Farewell Denmark Strait Greenland Labrador Sea |
genre_facet |
Cape Farewell Denmark Strait Greenland Labrador Sea |
op_source |
Pacini, A., Pickart, R. S., Le Bras, I. A., Straneo, F., Holliday, N. P., & Spall, M. A. (2021). Cyclonic Eddies in the West Greenland Boundary Current System. Journal of Physical Oceanography, 51(7), 2087–2102. doi:10.1175/JPO-D-20-0255.1 |
op_relation |
https://doi.org/10.1175/JPO-D-20-0255.1 Pacini, A., Pickart, R. S., Le Bras, I. A., Straneo, F., Holliday, N. P., & Spall, M. A. (2021). Cyclonic Eddies in the West Greenland Boundary Current System. Journal of Physical Oceanography, 51(7), 2087–2102. https://hdl.handle.net/1912/27639 doi:10.1175/JPO-D-20-0255.1 |
op_doi |
https://doi.org/10.1175/JPO-D-20-0255.1 |
container_title |
Journal of Physical Oceanography |
_version_ |
1766387207924350976 |