Thermal conductivity of landfast Antarctic and Arctic sea ice
[1] We present final results from a program to measure the thermal conductivity of sea ice with in situ thermistor arrays using an amended analysis of new and previously reported ice temperatures. Results from landfast first-year (FY) ice near Barrow, Alaska, and McMurdo Sound, Antarctica, are consi...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.530.5719 2023-05-15T13:32:14+02:00 Thermal conductivity of landfast Antarctic and Arctic sea ice The Pennsylvania State University CiteSeerX Archives application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.530.5719 http://www2.gi.alaska.edu/snowice/sea-lake-ice/papers/07PETB.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.530.5719 http://www2.gi.alaska.edu/snowice/sea-lake-ice/papers/07PETB.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://www2.gi.alaska.edu/snowice/sea-lake-ice/papers/07PETB.pdf text ftciteseerx 2016-01-08T10:35:21Z [1] We present final results from a program to measure the thermal conductivity of sea ice with in situ thermistor arrays using an amended analysis of new and previously reported ice temperatures. Results from landfast first-year (FY) ice near Barrow, Alaska, and McMurdo Sound, Antarctica, are consistent with predictions from effective-medium models but 10–15 % higher than values from the parameterization currently used in most sea ice models. We observe no previously reported anomalous near-surface reduction, which is now understood to have been an artifact, nor a convective enhancement to the heat flow, although our analysis is limited to temperatures below 5C at which brine percolation is restricted. Results for landfast multiyear (MY) ice in McMurdo Sound are also consistent with effective-medium predictions, and emphasize the density dependence. We compare these and historical measurements with effective-medium predictions and the representation commonly used in sea ice models, developed originally for MY Arctic ice. We propose an alternative expression derived from effective-medium models, appropriate for both MY and FY ice that is consistent with experimental results, k = (r/ri)(2.11 0.011 q + 0.09 (S/q) (r ri)/1000), where ri and r are the density of pure ice and sea ice (kg m3), and q (C) and S (ppt) are sea ice temperature and salinity. For the winter and spring conditions studied here, thermal signatures of internal brine motion were observed rarely (22 times in 1957 days), and their maximum contribution to the total heat flow is estimated to be of the order of a few percent. Text Antarc* Antarctic Antarctica Arctic Barrow McMurdo Sound Sea ice Alaska Unknown Antarctic Arctic McMurdo Sound |
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ftciteseerx |
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English |
description |
[1] We present final results from a program to measure the thermal conductivity of sea ice with in situ thermistor arrays using an amended analysis of new and previously reported ice temperatures. Results from landfast first-year (FY) ice near Barrow, Alaska, and McMurdo Sound, Antarctica, are consistent with predictions from effective-medium models but 10–15 % higher than values from the parameterization currently used in most sea ice models. We observe no previously reported anomalous near-surface reduction, which is now understood to have been an artifact, nor a convective enhancement to the heat flow, although our analysis is limited to temperatures below 5C at which brine percolation is restricted. Results for landfast multiyear (MY) ice in McMurdo Sound are also consistent with effective-medium predictions, and emphasize the density dependence. We compare these and historical measurements with effective-medium predictions and the representation commonly used in sea ice models, developed originally for MY Arctic ice. We propose an alternative expression derived from effective-medium models, appropriate for both MY and FY ice that is consistent with experimental results, k = (r/ri)(2.11 0.011 q + 0.09 (S/q) (r ri)/1000), where ri and r are the density of pure ice and sea ice (kg m3), and q (C) and S (ppt) are sea ice temperature and salinity. For the winter and spring conditions studied here, thermal signatures of internal brine motion were observed rarely (22 times in 1957 days), and their maximum contribution to the total heat flow is estimated to be of the order of a few percent. |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
title |
Thermal conductivity of landfast Antarctic and Arctic sea ice |
spellingShingle |
Thermal conductivity of landfast Antarctic and Arctic sea ice |
title_short |
Thermal conductivity of landfast Antarctic and Arctic sea ice |
title_full |
Thermal conductivity of landfast Antarctic and Arctic sea ice |
title_fullStr |
Thermal conductivity of landfast Antarctic and Arctic sea ice |
title_full_unstemmed |
Thermal conductivity of landfast Antarctic and Arctic sea ice |
title_sort |
thermal conductivity of landfast antarctic and arctic sea ice |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.530.5719 http://www2.gi.alaska.edu/snowice/sea-lake-ice/papers/07PETB.pdf |
geographic |
Antarctic Arctic McMurdo Sound |
geographic_facet |
Antarctic Arctic McMurdo Sound |
genre |
Antarc* Antarctic Antarctica Arctic Barrow McMurdo Sound Sea ice Alaska |
genre_facet |
Antarc* Antarctic Antarctica Arctic Barrow McMurdo Sound Sea ice Alaska |
op_source |
http://www2.gi.alaska.edu/snowice/sea-lake-ice/papers/07PETB.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.530.5719 http://www2.gi.alaska.edu/snowice/sea-lake-ice/papers/07PETB.pdf |
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Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
_version_ |
1766025326531444736 |