Effects of stratified active layers on high-altitude permafrost warming: a case study on the Qinghai–Tibet Plateau
Seasonally variable thermal conductivity in active layers is one important factor that controls the thermal state of permafrost. The common assumption is that this conductivity is considerably lower in the thawed than in the frozen state, λt/λf < 1. Using a 9-year dataset from the Qinghai–Tibet P...
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Copernicus Publications
2016
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Online Access: | https://doi.org/10.5194/tc-10-1591-2016 http://www.the-cryosphere.net/10/1591/2016/tc-10-1591-2016.pdf https://doaj.org/article/eae5384e1c004b198c43c578d1423655 |
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fttriple:oai:gotriple.eu:oai:doaj.org/article:eae5384e1c004b198c43c578d1423655 2023-05-15T17:56:30+02:00 Effects of stratified active layers on high-altitude permafrost warming: a case study on the Qinghai–Tibet Plateau X. Pan Y. Li Q. Yu X. Shi D. Yang K. Roth 2016-07-01 https://doi.org/10.5194/tc-10-1591-2016 http://www.the-cryosphere.net/10/1591/2016/tc-10-1591-2016.pdf https://doaj.org/article/eae5384e1c004b198c43c578d1423655 en eng Copernicus Publications 1994-0416 1994-0424 doi:10.5194/tc-10-1591-2016 http://www.the-cryosphere.net/10/1591/2016/tc-10-1591-2016.pdf https://doaj.org/article/eae5384e1c004b198c43c578d1423655 undefined The Cryosphere, Vol 10, Iss 4, Pp 1591-1603 (2016) envir geo Journal Article https://vocabularies.coar-repositories.org/resource_types/c_6501/ 2016 fttriple https://doi.org/10.5194/tc-10-1591-2016 2023-01-22T17:52:57Z Seasonally variable thermal conductivity in active layers is one important factor that controls the thermal state of permafrost. The common assumption is that this conductivity is considerably lower in the thawed than in the frozen state, λt/λf < 1. Using a 9-year dataset from the Qinghai–Tibet Plateau (QTP) in conjunction with the GEOtop model, we demonstrate that the ratio λt/λf may approach or even exceed 1. This can happen in thick (> 1.5 m) active layers with strong seasonal total water content changes in the regions with summer-monsoon-dominated precipitation pattern. The conductivity ratio can be further increased by typical soil architectures that may lead to a dry interlayer. The unique pattern of soil hydraulic and thermal dynamics in the active layer can be one important contributor for the rapid permafrost warming at the study site. These findings suggest that, given the increase in air temperature and precipitation, soil hydraulic properties, particularly soil architecture in those thick active layers must be properly taken into account in permafrost models. Article in Journal/Newspaper permafrost The Cryosphere Unknown The Cryosphere 10 4 1591 1603 |
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English |
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envir geo |
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envir geo X. Pan Y. Li Q. Yu X. Shi D. Yang K. Roth Effects of stratified active layers on high-altitude permafrost warming: a case study on the Qinghai–Tibet Plateau |
topic_facet |
envir geo |
description |
Seasonally variable thermal conductivity in active layers is one important factor that controls the thermal state of permafrost. The common assumption is that this conductivity is considerably lower in the thawed than in the frozen state, λt/λf < 1. Using a 9-year dataset from the Qinghai–Tibet Plateau (QTP) in conjunction with the GEOtop model, we demonstrate that the ratio λt/λf may approach or even exceed 1. This can happen in thick (> 1.5 m) active layers with strong seasonal total water content changes in the regions with summer-monsoon-dominated precipitation pattern. The conductivity ratio can be further increased by typical soil architectures that may lead to a dry interlayer. The unique pattern of soil hydraulic and thermal dynamics in the active layer can be one important contributor for the rapid permafrost warming at the study site. These findings suggest that, given the increase in air temperature and precipitation, soil hydraulic properties, particularly soil architecture in those thick active layers must be properly taken into account in permafrost models. |
format |
Article in Journal/Newspaper |
author |
X. Pan Y. Li Q. Yu X. Shi D. Yang K. Roth |
author_facet |
X. Pan Y. Li Q. Yu X. Shi D. Yang K. Roth |
author_sort |
X. Pan |
title |
Effects of stratified active layers on high-altitude permafrost warming: a case study on the Qinghai–Tibet Plateau |
title_short |
Effects of stratified active layers on high-altitude permafrost warming: a case study on the Qinghai–Tibet Plateau |
title_full |
Effects of stratified active layers on high-altitude permafrost warming: a case study on the Qinghai–Tibet Plateau |
title_fullStr |
Effects of stratified active layers on high-altitude permafrost warming: a case study on the Qinghai–Tibet Plateau |
title_full_unstemmed |
Effects of stratified active layers on high-altitude permafrost warming: a case study on the Qinghai–Tibet Plateau |
title_sort |
effects of stratified active layers on high-altitude permafrost warming: a case study on the qinghai–tibet plateau |
publisher |
Copernicus Publications |
publishDate |
2016 |
url |
https://doi.org/10.5194/tc-10-1591-2016 http://www.the-cryosphere.net/10/1591/2016/tc-10-1591-2016.pdf https://doaj.org/article/eae5384e1c004b198c43c578d1423655 |
genre |
permafrost The Cryosphere |
genre_facet |
permafrost The Cryosphere |
op_source |
The Cryosphere, Vol 10, Iss 4, Pp 1591-1603 (2016) |
op_relation |
1994-0416 1994-0424 doi:10.5194/tc-10-1591-2016 http://www.the-cryosphere.net/10/1591/2016/tc-10-1591-2016.pdf https://doaj.org/article/eae5384e1c004b198c43c578d1423655 |
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undefined |
op_doi |
https://doi.org/10.5194/tc-10-1591-2016 |
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The Cryosphere |
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10 |
container_issue |
4 |
container_start_page |
1591 |
op_container_end_page |
1603 |
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1766164681809985536 |