Convective heat transfer over thin ice covered coastal polynyas
Polynyas play an important role in the regional meteorology and oceanography of the high latitudes and in the global ocean circulation. Unique low-level observations of an Antarctic coastal polynya, the Ronne Polynya, were conducted using an instrumented aircraft. At the time of the observations, th...
Published in: | Journal of Geophysical Research: Oceans |
---|---|
Main Authors: | , , , |
Format: | Article in Journal/Newspaper |
Language: | unknown |
Published: |
2010
|
Subjects: | |
Online Access: | https://ueaeprints.uea.ac.uk/id/eprint/20283/ https://doi.org/10.1029/2009JC005797 |
id |
ftuniveastangl:oai:ueaeprints.uea.ac.uk:20283 |
---|---|
record_format |
openpolar |
spelling |
ftuniveastangl:oai:ueaeprints.uea.ac.uk:20283 2024-04-21T07:52:39+00:00 Convective heat transfer over thin ice covered coastal polynyas Fiedler, E. K. Lachlan-Cope, T. A. Renfrew, I. A. King, J. C. 2010 https://ueaeprints.uea.ac.uk/id/eprint/20283/ https://doi.org/10.1029/2009JC005797 unknown Fiedler, E. K., Lachlan-Cope, T. A., Renfrew, I. A. and King, J. C. (2010) Convective heat transfer over thin ice covered coastal polynyas. Journal of Geophysical Research C: Oceans, 115 (10). doi:10.1029/2009JC005797 Article PeerReviewed 2010 ftuniveastangl https://doi.org/10.1029/2009JC005797 2024-03-27T17:54:51Z Polynyas play an important role in the regional meteorology and oceanography of the high latitudes and in the global ocean circulation. Unique low-level observations of an Antarctic coastal polynya, the Ronne Polynya, were conducted using an instrumented aircraft. At the time of the observations, the polynya was mostly covered with thin ice perforated with holes and was composed of two distinct regimes: an inner region of newly formed and thin ice and an outer region of thicker more consolidated ice. The sensible heat flux over the polynya was ~100 W m-2 and decreased with fetch, primarily as a result of the thickening ice cover. The mean sensible heat transfer and drag coefficients over the polynya were CHN10 = (0.7 ± 0.1) × 10-3 and CDN10 = (1.1 ± 0.2) × 10-3, respectively. The heat transfer coefficient is similar to that found over heterogeneous sea ice and is significantly lower than has been used in previous studies of heat fluxes over polynyas, which are often assumed to be open water. The transfer coefficients were not found to be a function of fetch or ice conditions as represented by the surface temperature and albedo. The data were used in an investigation of the output of sensible heat flux, potential temperature, and boundary layer depth from a simple fetch-dependent model. For this case study, surface temperatures and transfer coefficients appropriate to an ice-covered surface were required for an accurate simulation. Article in Journal/Newspaper Antarc* Antarctic Sea ice University of East Anglia: UEA Digital Repository Journal of Geophysical Research: Oceans 115 C10 |
institution |
Open Polar |
collection |
University of East Anglia: UEA Digital Repository |
op_collection_id |
ftuniveastangl |
language |
unknown |
description |
Polynyas play an important role in the regional meteorology and oceanography of the high latitudes and in the global ocean circulation. Unique low-level observations of an Antarctic coastal polynya, the Ronne Polynya, were conducted using an instrumented aircraft. At the time of the observations, the polynya was mostly covered with thin ice perforated with holes and was composed of two distinct regimes: an inner region of newly formed and thin ice and an outer region of thicker more consolidated ice. The sensible heat flux over the polynya was ~100 W m-2 and decreased with fetch, primarily as a result of the thickening ice cover. The mean sensible heat transfer and drag coefficients over the polynya were CHN10 = (0.7 ± 0.1) × 10-3 and CDN10 = (1.1 ± 0.2) × 10-3, respectively. The heat transfer coefficient is similar to that found over heterogeneous sea ice and is significantly lower than has been used in previous studies of heat fluxes over polynyas, which are often assumed to be open water. The transfer coefficients were not found to be a function of fetch or ice conditions as represented by the surface temperature and albedo. The data were used in an investigation of the output of sensible heat flux, potential temperature, and boundary layer depth from a simple fetch-dependent model. For this case study, surface temperatures and transfer coefficients appropriate to an ice-covered surface were required for an accurate simulation. |
format |
Article in Journal/Newspaper |
author |
Fiedler, E. K. Lachlan-Cope, T. A. Renfrew, I. A. King, J. C. |
spellingShingle |
Fiedler, E. K. Lachlan-Cope, T. A. Renfrew, I. A. King, J. C. Convective heat transfer over thin ice covered coastal polynyas |
author_facet |
Fiedler, E. K. Lachlan-Cope, T. A. Renfrew, I. A. King, J. C. |
author_sort |
Fiedler, E. K. |
title |
Convective heat transfer over thin ice covered coastal polynyas |
title_short |
Convective heat transfer over thin ice covered coastal polynyas |
title_full |
Convective heat transfer over thin ice covered coastal polynyas |
title_fullStr |
Convective heat transfer over thin ice covered coastal polynyas |
title_full_unstemmed |
Convective heat transfer over thin ice covered coastal polynyas |
title_sort |
convective heat transfer over thin ice covered coastal polynyas |
publishDate |
2010 |
url |
https://ueaeprints.uea.ac.uk/id/eprint/20283/ https://doi.org/10.1029/2009JC005797 |
genre |
Antarc* Antarctic Sea ice |
genre_facet |
Antarc* Antarctic Sea ice |
op_relation |
Fiedler, E. K., Lachlan-Cope, T. A., Renfrew, I. A. and King, J. C. (2010) Convective heat transfer over thin ice covered coastal polynyas. Journal of Geophysical Research C: Oceans, 115 (10). doi:10.1029/2009JC005797 |
op_doi |
https://doi.org/10.1029/2009JC005797 |
container_title |
Journal of Geophysical Research: Oceans |
container_volume |
115 |
container_issue |
C10 |
_version_ |
1796935851290132480 |