Temperature variation and apparent thermal diffusivity in the refreezing active layer, Toolik Lake, Alaska
Abstract Temperatures were sampled at eight‐hour intervals over a five‐month period within the refreezing active layer at Toolik Lake, Alaska. The variance spectra of the temperature series, calculated as a function of wavelength, reveal relatively high‐frequency (sub‐diurnal) temperature fluctuatio...
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crwiley:10.1002/ppp.3430010306 2024-06-23T07:56:07+00:00 Temperature variation and apparent thermal diffusivity in the refreezing active layer, Toolik Lake, Alaska Hinkel, K. M. Outcalt, S. I. Nelson, F. E. 1990 http://dx.doi.org/10.1002/ppp.3430010306 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fppp.3430010306 https://onlinelibrary.wiley.com/doi/pdf/10.1002/ppp.3430010306 en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Permafrost and Periglacial Processes volume 1, issue 3-4, page 265-274 ISSN 1045-6740 1099-1530 journal-article 1990 crwiley https://doi.org/10.1002/ppp.3430010306 2024-06-11T04:39:01Z Abstract Temperatures were sampled at eight‐hour intervals over a five‐month period within the refreezing active layer at Toolik Lake, Alaska. The variance spectra of the temperature series, calculated as a function of wavelength, reveal relatively high‐frequency (sub‐diurnal) temperature fluctuations near the base of the active layer during refreezing, behaviour that is not consistent with a purely conductive system. The thermal records were also used in a numerical scheme to calculate apparent thermal diffusivity at regularly spaced depths in the substrate. Widely fluctuating positive and negative diffusivity values suggest that non‐conductive processes play an important role in heat transport during and after freezeback. Phase transformations, vapour diffusion and water advection all can enhance or oppose the conductive tendency. Models based exclusively on conductive principles are inadequate to explain thermal evolution in the dynamic near‐surface layer of permafrost regions. Article in Journal/Newspaper permafrost Permafrost and Periglacial Processes Alaska Wiley Online Library Permafrost and Periglacial Processes 1 3-4 265 274 |
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Open Polar |
collection |
Wiley Online Library |
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crwiley |
language |
English |
description |
Abstract Temperatures were sampled at eight‐hour intervals over a five‐month period within the refreezing active layer at Toolik Lake, Alaska. The variance spectra of the temperature series, calculated as a function of wavelength, reveal relatively high‐frequency (sub‐diurnal) temperature fluctuations near the base of the active layer during refreezing, behaviour that is not consistent with a purely conductive system. The thermal records were also used in a numerical scheme to calculate apparent thermal diffusivity at regularly spaced depths in the substrate. Widely fluctuating positive and negative diffusivity values suggest that non‐conductive processes play an important role in heat transport during and after freezeback. Phase transformations, vapour diffusion and water advection all can enhance or oppose the conductive tendency. Models based exclusively on conductive principles are inadequate to explain thermal evolution in the dynamic near‐surface layer of permafrost regions. |
format |
Article in Journal/Newspaper |
author |
Hinkel, K. M. Outcalt, S. I. Nelson, F. E. |
spellingShingle |
Hinkel, K. M. Outcalt, S. I. Nelson, F. E. Temperature variation and apparent thermal diffusivity in the refreezing active layer, Toolik Lake, Alaska |
author_facet |
Hinkel, K. M. Outcalt, S. I. Nelson, F. E. |
author_sort |
Hinkel, K. M. |
title |
Temperature variation and apparent thermal diffusivity in the refreezing active layer, Toolik Lake, Alaska |
title_short |
Temperature variation and apparent thermal diffusivity in the refreezing active layer, Toolik Lake, Alaska |
title_full |
Temperature variation and apparent thermal diffusivity in the refreezing active layer, Toolik Lake, Alaska |
title_fullStr |
Temperature variation and apparent thermal diffusivity in the refreezing active layer, Toolik Lake, Alaska |
title_full_unstemmed |
Temperature variation and apparent thermal diffusivity in the refreezing active layer, Toolik Lake, Alaska |
title_sort |
temperature variation and apparent thermal diffusivity in the refreezing active layer, toolik lake, alaska |
publisher |
Wiley |
publishDate |
1990 |
url |
http://dx.doi.org/10.1002/ppp.3430010306 https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1002%2Fppp.3430010306 https://onlinelibrary.wiley.com/doi/pdf/10.1002/ppp.3430010306 |
genre |
permafrost Permafrost and Periglacial Processes Alaska |
genre_facet |
permafrost Permafrost and Periglacial Processes Alaska |
op_source |
Permafrost and Periglacial Processes volume 1, issue 3-4, page 265-274 ISSN 1045-6740 1099-1530 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1002/ppp.3430010306 |
container_title |
Permafrost and Periglacial Processes |
container_volume |
1 |
container_issue |
3-4 |
container_start_page |
265 |
op_container_end_page |
274 |
_version_ |
1802649014486695936 |