Circulation and Thermohaline Variability of the Hanna Shoal Region on the Northeastern Chukchi Sea Shelf
We analyzed velocity and hydrographic data from 23 moorings in the northeast Chukchi Sea from 2011 to 2014. In most years the eastern side of Hanna Shoal was strongly stratified year-round, while weakly stratified regions prevailed on the shelf south and west of the Shoal. Stratification differences...
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Online Access: | https://epic.awi.de/id/eprint/52575/ https://doi.org/10.1029/2019JC015639 https://hdl.handle.net/10013/epic.17fde969-3064-47cf-be84-2b2bf9771c9e |
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ftawi:oai:epic.awi.de:52575 2024-09-09T19:36:28+00:00 Circulation and Thermohaline Variability of the Hanna Shoal Region on the Northeastern Chukchi Sea Shelf Fang, Ying-Chih Weingartner, Thomas J. Dobbins, Elizabeth L Winsor, Peter Statscewich, Hank Potter, Rachel A Mudge, Todd D Stoudt, Chase A Borg, Keath 2020-06-04 https://epic.awi.de/id/eprint/52575/ https://doi.org/10.1029/2019JC015639 https://hdl.handle.net/10013/epic.17fde969-3064-47cf-be84-2b2bf9771c9e unknown Wiley Fang, Y. C. orcid:0000-0002-7296-9481 , Weingartner, T. J. , Dobbins, E. L. , Winsor, P. , Statscewich, H. , Potter, R. A. , Mudge, T. D. , Stoudt, C. A. and Borg, K. (2020) Circulation and Thermohaline Variability of the Hanna Shoal Region on the Northeastern Chukchi Sea Shelf , Journal of Geophysical Research: Oceans . doi:10.1029/2019JC015639 <https://doi.org/10.1029/2019JC015639> , hdl:10013/epic.17fde969-3064-47cf-be84-2b2bf9771c9e EPIC3Journal of Geophysical Research: Oceans, Wiley Article peerRev 2020 ftawi https://doi.org/10.1029/2019JC015639 2024-06-24T04:24:41Z We analyzed velocity and hydrographic data from 23 moorings in the northeast Chukchi Sea from 2011 to 2014. In most years the eastern side of Hanna Shoal was strongly stratified year-round, while weakly stratified regions prevailed on the shelf south and west of the Shoal. Stratification differences cause differential vertical mixing rates, which in conjunction with advection of different bottom water properties resulted in seasonally-varying along-isobath density gradients. In agreement with numerical models, we find that bottom waters flow anticyclonically around the Shoal. Whereas most of the shelf responded barotropically to wind-forcing, there was a strong baroclinic component to the flow field northeast of Hanna Shoal, resulting in no net vertically-integrated transport on average. In contrast there is a net eastward transport from west of the Shoal, which implies convergence north of the Shoal. Convergence and along-isobath density gradients may foster cross-shelf exchange north of Hanna Shoal. Modal analyses indicate that the shelf south of the Shoal and Barrow Canyon responded coherently to local and remote winds, whereas the wind-current response around Hanna Shoal was less coherent. Barotropic topographic waves, of ~3-day period, were generated episodically northeast of the Shoal and propagate clockwise around Hanna Shoal, but are blocked from entering Barrow Canyon and are possibly scattered by the horizontally sheared flow and converging isobaths on the western side of the Shoal. Analysis of water properties on the western side of Hanna Shoal suggests that these include contributions from the western and southern portions of the Chukchi Sea. Article in Journal/Newspaper Chukchi Chukchi Sea Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) Chukchi Sea Barrow Canyon ENVELOPE(-154.000,-154.000,72.500,72.500) Hanna Shoal ENVELOPE(-162.000,-162.000,72.000,72.000) Journal of Geophysical Research: Oceans 125 7 |
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 |
We analyzed velocity and hydrographic data from 23 moorings in the northeast Chukchi Sea from 2011 to 2014. In most years the eastern side of Hanna Shoal was strongly stratified year-round, while weakly stratified regions prevailed on the shelf south and west of the Shoal. Stratification differences cause differential vertical mixing rates, which in conjunction with advection of different bottom water properties resulted in seasonally-varying along-isobath density gradients. In agreement with numerical models, we find that bottom waters flow anticyclonically around the Shoal. Whereas most of the shelf responded barotropically to wind-forcing, there was a strong baroclinic component to the flow field northeast of Hanna Shoal, resulting in no net vertically-integrated transport on average. In contrast there is a net eastward transport from west of the Shoal, which implies convergence north of the Shoal. Convergence and along-isobath density gradients may foster cross-shelf exchange north of Hanna Shoal. Modal analyses indicate that the shelf south of the Shoal and Barrow Canyon responded coherently to local and remote winds, whereas the wind-current response around Hanna Shoal was less coherent. Barotropic topographic waves, of ~3-day period, were generated episodically northeast of the Shoal and propagate clockwise around Hanna Shoal, but are blocked from entering Barrow Canyon and are possibly scattered by the horizontally sheared flow and converging isobaths on the western side of the Shoal. Analysis of water properties on the western side of Hanna Shoal suggests that these include contributions from the western and southern portions of the Chukchi Sea. |
format |
Article in Journal/Newspaper |
author |
Fang, Ying-Chih Weingartner, Thomas J. Dobbins, Elizabeth L Winsor, Peter Statscewich, Hank Potter, Rachel A Mudge, Todd D Stoudt, Chase A Borg, Keath |
spellingShingle |
Fang, Ying-Chih Weingartner, Thomas J. Dobbins, Elizabeth L Winsor, Peter Statscewich, Hank Potter, Rachel A Mudge, Todd D Stoudt, Chase A Borg, Keath Circulation and Thermohaline Variability of the Hanna Shoal Region on the Northeastern Chukchi Sea Shelf |
author_facet |
Fang, Ying-Chih Weingartner, Thomas J. Dobbins, Elizabeth L Winsor, Peter Statscewich, Hank Potter, Rachel A Mudge, Todd D Stoudt, Chase A Borg, Keath |
author_sort |
Fang, Ying-Chih |
title |
Circulation and Thermohaline Variability of the Hanna Shoal Region on the Northeastern Chukchi Sea Shelf |
title_short |
Circulation and Thermohaline Variability of the Hanna Shoal Region on the Northeastern Chukchi Sea Shelf |
title_full |
Circulation and Thermohaline Variability of the Hanna Shoal Region on the Northeastern Chukchi Sea Shelf |
title_fullStr |
Circulation and Thermohaline Variability of the Hanna Shoal Region on the Northeastern Chukchi Sea Shelf |
title_full_unstemmed |
Circulation and Thermohaline Variability of the Hanna Shoal Region on the Northeastern Chukchi Sea Shelf |
title_sort |
circulation and thermohaline variability of the hanna shoal region on the northeastern chukchi sea shelf |
publisher |
Wiley |
publishDate |
2020 |
url |
https://epic.awi.de/id/eprint/52575/ https://doi.org/10.1029/2019JC015639 https://hdl.handle.net/10013/epic.17fde969-3064-47cf-be84-2b2bf9771c9e |
long_lat |
ENVELOPE(-154.000,-154.000,72.500,72.500) ENVELOPE(-162.000,-162.000,72.000,72.000) |
geographic |
Chukchi Sea Barrow Canyon Hanna Shoal |
geographic_facet |
Chukchi Sea Barrow Canyon Hanna Shoal |
genre |
Chukchi Chukchi Sea |
genre_facet |
Chukchi Chukchi Sea |
op_source |
EPIC3Journal of Geophysical Research: Oceans, Wiley |
op_relation |
Fang, Y. C. orcid:0000-0002-7296-9481 , Weingartner, T. J. , Dobbins, E. L. , Winsor, P. , Statscewich, H. , Potter, R. A. , Mudge, T. D. , Stoudt, C. A. and Borg, K. (2020) Circulation and Thermohaline Variability of the Hanna Shoal Region on the Northeastern Chukchi Sea Shelf , Journal of Geophysical Research: Oceans . doi:10.1029/2019JC015639 <https://doi.org/10.1029/2019JC015639> , hdl:10013/epic.17fde969-3064-47cf-be84-2b2bf9771c9e |
op_doi |
https://doi.org/10.1029/2019JC015639 |
container_title |
Journal of Geophysical Research: Oceans |
container_volume |
125 |
container_issue |
7 |
_version_ |
1809905633688813568 |