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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ftnonlinearchiv:oai:noa.gwlb.de:cop_mods_00011789 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 Pan, Xicai Li, Yanping Yu, Qihao Shi, Xiaogang Yang, Daqing Roth, Kurt 2016-07 electronic https://doi.org/10.5194/tc-10-1591-2016 https://noa.gwlb.de/receive/cop_mods_00011789 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00011746/tc-10-1591-2016.pdf https://tc.copernicus.org/articles/10/1591/2016/tc-10-1591-2016.pdf eng eng Copernicus Publications The Cryosphere -- ˜Theœ Cryosphere -- http://www.bibliothek.uni-regensburg.de/ezeit/?2393169 -- http://www.the-cryosphere.net/ -- 1994-0424 https://doi.org/10.5194/tc-10-1591-2016 https://noa.gwlb.de/receive/cop_mods_00011789 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00011746/tc-10-1591-2016.pdf https://tc.copernicus.org/articles/10/1591/2016/tc-10-1591-2016.pdf uneingeschränkt info:eu-repo/semantics/openAccess article Verlagsveröffentlichung article Text doc-type:article 2016 ftnonlinearchiv https://doi.org/10.5194/tc-10-1591-2016 2022-02-08T22:56:23Z 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 Niedersächsisches Online-Archiv NOA The Cryosphere 10 4 1591 1603 |
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article Verlagsveröffentlichung Pan, Xicai Li, Yanping Yu, Qihao Shi, Xiaogang Yang, Daqing Roth, Kurt Effects of stratified active layers on high-altitude permafrost warming: a case study on the Qinghai–Tibet Plateau |
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article Verlagsveröffentlichung |
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 |
Pan, Xicai Li, Yanping Yu, Qihao Shi, Xiaogang Yang, Daqing Roth, Kurt |
author_facet |
Pan, Xicai Li, Yanping Yu, Qihao Shi, Xiaogang Yang, Daqing Roth, Kurt |
author_sort |
Pan, Xicai |
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 https://noa.gwlb.de/receive/cop_mods_00011789 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00011746/tc-10-1591-2016.pdf https://tc.copernicus.org/articles/10/1591/2016/tc-10-1591-2016.pdf |
genre |
permafrost The Cryosphere |
genre_facet |
permafrost The Cryosphere |
op_relation |
The Cryosphere -- ˜Theœ Cryosphere -- http://www.bibliothek.uni-regensburg.de/ezeit/?2393169 -- http://www.the-cryosphere.net/ -- 1994-0424 https://doi.org/10.5194/tc-10-1591-2016 https://noa.gwlb.de/receive/cop_mods_00011789 https://noa.gwlb.de/servlets/MCRFileNodeServlet/cop_derivate_00011746/tc-10-1591-2016.pdf https://tc.copernicus.org/articles/10/1591/2016/tc-10-1591-2016.pdf |
op_rights |
uneingeschränkt info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.5194/tc-10-1591-2016 |
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The Cryosphere |
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10 |
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1591 |
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1603 |
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