Tide-induced vertical mixing in the Laptev Sea coastal polynya
Enhanced semidiurnal-band velocity shear across the shelf halocline layer (SHL) was found during land-fast ice edge mooring-based acoustic Doppler current profiler (ADCP) and conductivity-temperature-depth (CTD) observations over the eastern Laptev Sea shelf (∼74°N, 128°E) in April–May 2008 and Apri...
Published in: | Journal of Geophysical Research: Oceans |
---|---|
Main Authors: | , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
AGU (American Geophysical Union)
2012
|
Subjects: | |
Online Access: | https://oceanrep.geomar.de/id/eprint/26094/ https://oceanrep.geomar.de/id/eprint/26094/1/2012_Dmitrenko-etal_JGR-O_jgrc12048.pdf https://doi.org/10.1029/2011JC006966 |
id |
ftoceanrep:oai:oceanrep.geomar.de:26094 |
---|---|
record_format |
openpolar |
spelling |
ftoceanrep:oai:oceanrep.geomar.de:26094 2023-05-15T17:07:14+02:00 Tide-induced vertical mixing in the Laptev Sea coastal polynya Dmitrenko, Igor A. Kirillov, Sergey A. Bloshkina, Ekaterina Lenn, Yueng-Djern 2012 text https://oceanrep.geomar.de/id/eprint/26094/ https://oceanrep.geomar.de/id/eprint/26094/1/2012_Dmitrenko-etal_JGR-O_jgrc12048.pdf https://doi.org/10.1029/2011JC006966 en eng AGU (American Geophysical Union) https://oceanrep.geomar.de/id/eprint/26094/1/2012_Dmitrenko-etal_JGR-O_jgrc12048.pdf Dmitrenko, I. A., Kirillov, S. A., Bloshkina, E. and Lenn, Y. D. (2012) Tide-induced vertical mixing in the Laptev Sea coastal polynya. Open Access Journal of Geophysical Research: Oceans, 117 . C00G14. DOI 10.1029/2011JC006966 <https://doi.org/10.1029/2011JC006966>. doi:10.1029/2011JC006966 info:eu-repo/semantics/openAccess Article PeerReviewed 2012 ftoceanrep https://doi.org/10.1029/2011JC006966 2023-04-07T15:15:19Z Enhanced semidiurnal-band velocity shear across the shelf halocline layer (SHL) was found during land-fast ice edge mooring-based acoustic Doppler current profiler (ADCP) and conductivity-temperature-depth (CTD) observations over the eastern Laptev Sea shelf (∼74°N, 128°E) in April–May 2008 and April 2009. In 2008, the major axis amplitude for the lunar semidiurnal M2tidal ellipses demonstrated intermediate maximum in the SHL at 11–13 m (15 ± 3 cm/s), gradually decreasing to subice and near-bottom layers to ∼9 ± 3 cm/s (at 7 m) and 7 ± 2 cm/s (at 19 m), respectively. In 2009, the semidiurnal tidal flow exhibited similar patterns, but velocities were reduced by about factor of 2. Our estimates of gradient Richardson numbers suggest that the velocity shear associated with semidiurnal baroclinic tidal flow may be strong enough to play a role in water mass modification, promoting shear instabilities, turbulence, and vertical mixing of seawater properties across the SHL. This suggestion is consistent with near-homogeneous water layers episodically occurring in the SHL. Differences in the background stratification and local tidal dynamics between 2008 and 2009, together with rapid responses of the semidiurnal motion to polynya openings, suggest that the baroclinic tide is locally generated. Article in Journal/Newspaper laptev Laptev Sea OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) Laptev Sea Journal of Geophysical Research: Oceans 117 C9 n/a n/a |
institution |
Open Polar |
collection |
OceanRep (GEOMAR Helmholtz Centre für Ocean Research Kiel) |
op_collection_id |
ftoceanrep |
language |
English |
description |
Enhanced semidiurnal-band velocity shear across the shelf halocline layer (SHL) was found during land-fast ice edge mooring-based acoustic Doppler current profiler (ADCP) and conductivity-temperature-depth (CTD) observations over the eastern Laptev Sea shelf (∼74°N, 128°E) in April–May 2008 and April 2009. In 2008, the major axis amplitude for the lunar semidiurnal M2tidal ellipses demonstrated intermediate maximum in the SHL at 11–13 m (15 ± 3 cm/s), gradually decreasing to subice and near-bottom layers to ∼9 ± 3 cm/s (at 7 m) and 7 ± 2 cm/s (at 19 m), respectively. In 2009, the semidiurnal tidal flow exhibited similar patterns, but velocities were reduced by about factor of 2. Our estimates of gradient Richardson numbers suggest that the velocity shear associated with semidiurnal baroclinic tidal flow may be strong enough to play a role in water mass modification, promoting shear instabilities, turbulence, and vertical mixing of seawater properties across the SHL. This suggestion is consistent with near-homogeneous water layers episodically occurring in the SHL. Differences in the background stratification and local tidal dynamics between 2008 and 2009, together with rapid responses of the semidiurnal motion to polynya openings, suggest that the baroclinic tide is locally generated. |
format |
Article in Journal/Newspaper |
author |
Dmitrenko, Igor A. Kirillov, Sergey A. Bloshkina, Ekaterina Lenn, Yueng-Djern |
spellingShingle |
Dmitrenko, Igor A. Kirillov, Sergey A. Bloshkina, Ekaterina Lenn, Yueng-Djern Tide-induced vertical mixing in the Laptev Sea coastal polynya |
author_facet |
Dmitrenko, Igor A. Kirillov, Sergey A. Bloshkina, Ekaterina Lenn, Yueng-Djern |
author_sort |
Dmitrenko, Igor A. |
title |
Tide-induced vertical mixing in the Laptev Sea coastal polynya |
title_short |
Tide-induced vertical mixing in the Laptev Sea coastal polynya |
title_full |
Tide-induced vertical mixing in the Laptev Sea coastal polynya |
title_fullStr |
Tide-induced vertical mixing in the Laptev Sea coastal polynya |
title_full_unstemmed |
Tide-induced vertical mixing in the Laptev Sea coastal polynya |
title_sort |
tide-induced vertical mixing in the laptev sea coastal polynya |
publisher |
AGU (American Geophysical Union) |
publishDate |
2012 |
url |
https://oceanrep.geomar.de/id/eprint/26094/ https://oceanrep.geomar.de/id/eprint/26094/1/2012_Dmitrenko-etal_JGR-O_jgrc12048.pdf https://doi.org/10.1029/2011JC006966 |
geographic |
Laptev Sea |
geographic_facet |
Laptev Sea |
genre |
laptev Laptev Sea |
genre_facet |
laptev Laptev Sea |
op_relation |
https://oceanrep.geomar.de/id/eprint/26094/1/2012_Dmitrenko-etal_JGR-O_jgrc12048.pdf Dmitrenko, I. A., Kirillov, S. A., Bloshkina, E. and Lenn, Y. D. (2012) Tide-induced vertical mixing in the Laptev Sea coastal polynya. Open Access Journal of Geophysical Research: Oceans, 117 . C00G14. DOI 10.1029/2011JC006966 <https://doi.org/10.1029/2011JC006966>. doi:10.1029/2011JC006966 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1029/2011JC006966 |
container_title |
Journal of Geophysical Research: Oceans |
container_volume |
117 |
container_issue |
C9 |
container_start_page |
n/a |
op_container_end_page |
n/a |
_version_ |
1766062580949843968 |