Frost boils and soil ice content: field observations
Our aim is to measure and explain the seasonal changes in soil ice content in the frost boils of Galbraith Lake, Alaska. Instruments were installed in a frost boil to monitor the ground surface position and soil state over a period of 4 years. By comparing the subsidence and thaw rates, we calculate...
Published in: | Permafrost and Periglacial Processes |
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Online Access: | https://doi.org/10.1002/ppp.567 |
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ftrepec:oai:RePEc:wly:perpro:v:17:y:2006:i:4:p:291-307 2023-05-15T18:32:58+02:00 Frost boils and soil ice content: field observations P. P. Overduin D. L. Kane https://doi.org/10.1002/ppp.567 unknown https://doi.org/10.1002/ppp.567 article ftrepec https://doi.org/10.1002/ppp.567 2020-12-04T13:31:25Z Our aim is to measure and explain the seasonal changes in soil ice content in the frost boils of Galbraith Lake, Alaska. Instruments were installed in a frost boil to monitor the ground surface position and soil state over a period of 4 years. By comparing the subsidence and thaw rates, we calculate the soil ice content as a function of depth. Measured soil temperatures, liquid water contents and bulk apparent thermal conductivities are used to estimate latent heat production and release in the soil. The frost boil heaves during freezing and settles during thaw while the surrounding tundra heaves negligibly, but subsides measurably. Despite large changes in freezing rates from year to year, total heave and its distribution across the frost boil are similar between years. Winter air temperature and snow depth influence the freezing rate and ice distribution as a function of depth, but not the overall heave. This suggests that heave is controlled by water availability rather than the rate of heat removal from the soil. Areal ground subsidence rates between 2 and 5 cm/yr are due to the disappearance of ice at the base of the active layer, raising the possibility of ongoing thermokarst expansion around Galbraith Lake. Copyright © 2006 John Wiley & Sons, Ltd. Article in Journal/Newspaper Thermokarst Tundra Alaska RePEc (Research Papers in Economics) Galbraith Lake ENVELOPE(-101.905,-101.905,55.591,55.591) Permafrost and Periglacial Processes 17 4 291 307 |
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Open Polar |
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RePEc (Research Papers in Economics) |
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ftrepec |
language |
unknown |
description |
Our aim is to measure and explain the seasonal changes in soil ice content in the frost boils of Galbraith Lake, Alaska. Instruments were installed in a frost boil to monitor the ground surface position and soil state over a period of 4 years. By comparing the subsidence and thaw rates, we calculate the soil ice content as a function of depth. Measured soil temperatures, liquid water contents and bulk apparent thermal conductivities are used to estimate latent heat production and release in the soil. The frost boil heaves during freezing and settles during thaw while the surrounding tundra heaves negligibly, but subsides measurably. Despite large changes in freezing rates from year to year, total heave and its distribution across the frost boil are similar between years. Winter air temperature and snow depth influence the freezing rate and ice distribution as a function of depth, but not the overall heave. This suggests that heave is controlled by water availability rather than the rate of heat removal from the soil. Areal ground subsidence rates between 2 and 5 cm/yr are due to the disappearance of ice at the base of the active layer, raising the possibility of ongoing thermokarst expansion around Galbraith Lake. Copyright © 2006 John Wiley & Sons, Ltd. |
format |
Article in Journal/Newspaper |
author |
P. P. Overduin D. L. Kane |
spellingShingle |
P. P. Overduin D. L. Kane Frost boils and soil ice content: field observations |
author_facet |
P. P. Overduin D. L. Kane |
author_sort |
P. P. Overduin |
title |
Frost boils and soil ice content: field observations |
title_short |
Frost boils and soil ice content: field observations |
title_full |
Frost boils and soil ice content: field observations |
title_fullStr |
Frost boils and soil ice content: field observations |
title_full_unstemmed |
Frost boils and soil ice content: field observations |
title_sort |
frost boils and soil ice content: field observations |
url |
https://doi.org/10.1002/ppp.567 |
long_lat |
ENVELOPE(-101.905,-101.905,55.591,55.591) |
geographic |
Galbraith Lake |
geographic_facet |
Galbraith Lake |
genre |
Thermokarst Tundra Alaska |
genre_facet |
Thermokarst Tundra Alaska |
op_relation |
https://doi.org/10.1002/ppp.567 |
op_doi |
https://doi.org/10.1002/ppp.567 |
container_title |
Permafrost and Periglacial Processes |
container_volume |
17 |
container_issue |
4 |
container_start_page |
291 |
op_container_end_page |
307 |
_version_ |
1766217191255965696 |