Evolution of a Canada Basin ice‐ocean boundary layer and mixed layer across a developing thermodynamically forced marginal ice zone
The article of record as published may be found at http://dx.doi.org/10.1002/2016JC011778 A comprehensive set of autonomous, ice-ocean measurements were collected across the Canada Basin to study the summer evolution of the ice-ocean boundary layer (IOBL) and ocean mixed layer (OML). Evaluation of l...
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ftnavalpschool:oai:calhoun.nps.edu:10945/62330 2024-06-09T07:45:15+00:00 Evolution of a Canada Basin ice‐ocean boundary layer and mixed layer across a developing thermodynamically forced marginal ice zone Gallaher, Shawn G. Stanton, Timothy P. Shaw, William J. Cole, Sylvia T. Toole, John M. Wilkinson, Jeremy P. Maksym, Ted Hwang, Byongjun 2016 application/pdf https://hdl.handle.net/10945/62330 en_US eng AGU Gallaher, Shawn G., et al. "Evolution of a Canada Basin ice‐ocean boundary layer and mixed layer across a developing thermodynamically forced marginal ice zone." Journal of Geophysical Research: Oceans 121.8 (2016): 6223-6250. https://hdl.handle.net/10945/62330 This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States. Article 2016 ftnavalpschool 2024-05-15T00:42:55Z The article of record as published may be found at http://dx.doi.org/10.1002/2016JC011778 A comprehensive set of autonomous, ice-ocean measurements were collected across the Canada Basin to study the summer evolution of the ice-ocean boundary layer (IOBL) and ocean mixed layer (OML). Evaluation of local heat and freshwater balances and associated turbulent forcing reveals that melt ponds (MPs) strongly influence the summer IOBL-OML evolution. Areal expansion of MPs in mid-June start the upper ocean evolution resulting in significant increases to ocean absorbed radiative flux (19 W m22 in this study). Buoyancy provided by MP drainage shoals and freshens the IOBL resulting in a 39 MJ m22 increase in heat storage in just 19 days (52% of the summer total). Following MP drainage, a near-surface fresh layer deepens through shear-forced mixing to form the summer mixed layer (sML). In late summer, basal melt increases due to stronger turbulent mixing in the thin sML and the expansion of open water areas due in part to wind-forced divergence of the sea ice. Thermal heterogeneities in the marginal ice zone (MIZ) upper ocean led to large ocean-to-ice heat fluxes (100�200 W m22) and enhanced basal ice melt (3� 6 cm d21), well away from the ice edge. Calculation of the upper ocean heat budget shows that local radiative heat input accounted for at least 89% of the observed latent heat losses and heat storage (partitioned 0.77/0.23). These results suggest that the extensive area of deteriorating sea ice observed away from the ice edge during the 2014 season, termed the ��thermodynamically forced MIZ,�� was driven primarily by local shortwave radiative forcing Article in Journal/Newspaper canada basin Sea ice Naval Postgraduate School: Calhoun Canada |
institution |
Open Polar |
collection |
Naval Postgraduate School: Calhoun |
op_collection_id |
ftnavalpschool |
language |
English |
description |
The article of record as published may be found at http://dx.doi.org/10.1002/2016JC011778 A comprehensive set of autonomous, ice-ocean measurements were collected across the Canada Basin to study the summer evolution of the ice-ocean boundary layer (IOBL) and ocean mixed layer (OML). Evaluation of local heat and freshwater balances and associated turbulent forcing reveals that melt ponds (MPs) strongly influence the summer IOBL-OML evolution. Areal expansion of MPs in mid-June start the upper ocean evolution resulting in significant increases to ocean absorbed radiative flux (19 W m22 in this study). Buoyancy provided by MP drainage shoals and freshens the IOBL resulting in a 39 MJ m22 increase in heat storage in just 19 days (52% of the summer total). Following MP drainage, a near-surface fresh layer deepens through shear-forced mixing to form the summer mixed layer (sML). In late summer, basal melt increases due to stronger turbulent mixing in the thin sML and the expansion of open water areas due in part to wind-forced divergence of the sea ice. Thermal heterogeneities in the marginal ice zone (MIZ) upper ocean led to large ocean-to-ice heat fluxes (100�200 W m22) and enhanced basal ice melt (3� 6 cm d21), well away from the ice edge. Calculation of the upper ocean heat budget shows that local radiative heat input accounted for at least 89% of the observed latent heat losses and heat storage (partitioned 0.77/0.23). These results suggest that the extensive area of deteriorating sea ice observed away from the ice edge during the 2014 season, termed the ��thermodynamically forced MIZ,�� was driven primarily by local shortwave radiative forcing |
format |
Article in Journal/Newspaper |
author |
Gallaher, Shawn G. Stanton, Timothy P. Shaw, William J. Cole, Sylvia T. Toole, John M. Wilkinson, Jeremy P. Maksym, Ted Hwang, Byongjun |
spellingShingle |
Gallaher, Shawn G. Stanton, Timothy P. Shaw, William J. Cole, Sylvia T. Toole, John M. Wilkinson, Jeremy P. Maksym, Ted Hwang, Byongjun Evolution of a Canada Basin ice‐ocean boundary layer and mixed layer across a developing thermodynamically forced marginal ice zone |
author_facet |
Gallaher, Shawn G. Stanton, Timothy P. Shaw, William J. Cole, Sylvia T. Toole, John M. Wilkinson, Jeremy P. Maksym, Ted Hwang, Byongjun |
author_sort |
Gallaher, Shawn G. |
title |
Evolution of a Canada Basin ice‐ocean boundary layer and mixed layer across a developing thermodynamically forced marginal ice zone |
title_short |
Evolution of a Canada Basin ice‐ocean boundary layer and mixed layer across a developing thermodynamically forced marginal ice zone |
title_full |
Evolution of a Canada Basin ice‐ocean boundary layer and mixed layer across a developing thermodynamically forced marginal ice zone |
title_fullStr |
Evolution of a Canada Basin ice‐ocean boundary layer and mixed layer across a developing thermodynamically forced marginal ice zone |
title_full_unstemmed |
Evolution of a Canada Basin ice‐ocean boundary layer and mixed layer across a developing thermodynamically forced marginal ice zone |
title_sort |
evolution of a canada basin ice‐ocean boundary layer and mixed layer across a developing thermodynamically forced marginal ice zone |
publisher |
AGU |
publishDate |
2016 |
url |
https://hdl.handle.net/10945/62330 |
geographic |
Canada |
geographic_facet |
Canada |
genre |
canada basin Sea ice |
genre_facet |
canada basin Sea ice |
op_relation |
Gallaher, Shawn G., et al. "Evolution of a Canada Basin ice‐ocean boundary layer and mixed layer across a developing thermodynamically forced marginal ice zone." Journal of Geophysical Research: Oceans 121.8 (2016): 6223-6250. https://hdl.handle.net/10945/62330 |
op_rights |
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States. |
_version_ |
1801374342727073792 |