An improved active layer thickness retrieval method over Qinghai-Tibet permafrost using InSAR technology: With emphasis on two-dimensional deformation and unfrozen water
The increasing warming and humidification have caused the dramatic degradation of Qinghai-Tibet Plateau permafrost. The active layer thickness (ALT) is particularly crucial to be monitored with a wide range as an indispensable variable to characterize permafrost status. Interferometric synthetic ape...
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ftdoajarticles:oai:doaj.org/article:0d068ecbee9e491cb8069217ca733900 2023-12-10T09:38:53+01:00 An improved active layer thickness retrieval method over Qinghai-Tibet permafrost using InSAR technology: With emphasis on two-dimensional deformation and unfrozen water Jiachen Li Qijie Wang Ya Zhang Sha Yang Guanyou Gao 2023-11-01T00:00:00Z https://doi.org/10.1016/j.jag.2023.103530 https://doaj.org/article/0d068ecbee9e491cb8069217ca733900 EN eng Elsevier http://www.sciencedirect.com/science/article/pii/S1569843223003540 https://doaj.org/toc/1569-8432 1569-8432 doi:10.1016/j.jag.2023.103530 https://doaj.org/article/0d068ecbee9e491cb8069217ca733900 International Journal of Applied Earth Observations and Geoinformation, Vol 124, Iss , Pp 103530- (2023) Active layer thickness Two-dimensional deformation Unfrozen water Multidimensional small baseline subset Qinghai-Tibet Plateau permafrost Physical geography GB3-5030 Environmental sciences GE1-350 article 2023 ftdoajarticles https://doi.org/10.1016/j.jag.2023.103530 2023-11-12T01:37:57Z The increasing warming and humidification have caused the dramatic degradation of Qinghai-Tibet Plateau permafrost. The active layer thickness (ALT) is particularly crucial to be monitored with a wide range as an indispensable variable to characterize permafrost status. Interferometric synthetic aperture radar (InSAR) technology has recently been widely used for ALT retrieval. However, these studies are mostly limited by the accuracy of one-dimensional deformation measurements and ignore the presence of unfrozen water in the negative temperature state of the soil. Therefore, an improved ALT retrieval model using InSAR technology is proposed considering the influence of two-dimensional deformation and unfrozen water. This paper first employed the multidimensional small baseline subset (MSBAS) technology to monitor two-dimensional surface deformation over the Beiluhe-Wudaoliang permafrost region. We observed that the study area underwent surface subsidence of up to 60 mm in the thawing season. Considering the influence of unfrozen water, the ALT was subsequently estimated using the InSAR-observed subsidence. The estimated ALT varied from 50 to 500 cm, with ALT in the Wudaoliang area being higher than that in the Beiluhe Basin. Based on in situ data, the improved method is better than the traditional InSAR-based methods with a mean absolute error of 0.404 m. Our study demonstrates that considering the influence of two-dimensional deformation and unfrozen water can effectively improve the accuracy and reliability of InSAR-based ALT retrieval. Article in Journal/Newspaper Active layer thickness permafrost Directory of Open Access Journals: DOAJ Articles International Journal of Applied Earth Observation and Geoinformation 124 103530 |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Active layer thickness Two-dimensional deformation Unfrozen water Multidimensional small baseline subset Qinghai-Tibet Plateau permafrost Physical geography GB3-5030 Environmental sciences GE1-350 |
spellingShingle |
Active layer thickness Two-dimensional deformation Unfrozen water Multidimensional small baseline subset Qinghai-Tibet Plateau permafrost Physical geography GB3-5030 Environmental sciences GE1-350 Jiachen Li Qijie Wang Ya Zhang Sha Yang Guanyou Gao An improved active layer thickness retrieval method over Qinghai-Tibet permafrost using InSAR technology: With emphasis on two-dimensional deformation and unfrozen water |
topic_facet |
Active layer thickness Two-dimensional deformation Unfrozen water Multidimensional small baseline subset Qinghai-Tibet Plateau permafrost Physical geography GB3-5030 Environmental sciences GE1-350 |
description |
The increasing warming and humidification have caused the dramatic degradation of Qinghai-Tibet Plateau permafrost. The active layer thickness (ALT) is particularly crucial to be monitored with a wide range as an indispensable variable to characterize permafrost status. Interferometric synthetic aperture radar (InSAR) technology has recently been widely used for ALT retrieval. However, these studies are mostly limited by the accuracy of one-dimensional deformation measurements and ignore the presence of unfrozen water in the negative temperature state of the soil. Therefore, an improved ALT retrieval model using InSAR technology is proposed considering the influence of two-dimensional deformation and unfrozen water. This paper first employed the multidimensional small baseline subset (MSBAS) technology to monitor two-dimensional surface deformation over the Beiluhe-Wudaoliang permafrost region. We observed that the study area underwent surface subsidence of up to 60 mm in the thawing season. Considering the influence of unfrozen water, the ALT was subsequently estimated using the InSAR-observed subsidence. The estimated ALT varied from 50 to 500 cm, with ALT in the Wudaoliang area being higher than that in the Beiluhe Basin. Based on in situ data, the improved method is better than the traditional InSAR-based methods with a mean absolute error of 0.404 m. Our study demonstrates that considering the influence of two-dimensional deformation and unfrozen water can effectively improve the accuracy and reliability of InSAR-based ALT retrieval. |
format |
Article in Journal/Newspaper |
author |
Jiachen Li Qijie Wang Ya Zhang Sha Yang Guanyou Gao |
author_facet |
Jiachen Li Qijie Wang Ya Zhang Sha Yang Guanyou Gao |
author_sort |
Jiachen Li |
title |
An improved active layer thickness retrieval method over Qinghai-Tibet permafrost using InSAR technology: With emphasis on two-dimensional deformation and unfrozen water |
title_short |
An improved active layer thickness retrieval method over Qinghai-Tibet permafrost using InSAR technology: With emphasis on two-dimensional deformation and unfrozen water |
title_full |
An improved active layer thickness retrieval method over Qinghai-Tibet permafrost using InSAR technology: With emphasis on two-dimensional deformation and unfrozen water |
title_fullStr |
An improved active layer thickness retrieval method over Qinghai-Tibet permafrost using InSAR technology: With emphasis on two-dimensional deformation and unfrozen water |
title_full_unstemmed |
An improved active layer thickness retrieval method over Qinghai-Tibet permafrost using InSAR technology: With emphasis on two-dimensional deformation and unfrozen water |
title_sort |
improved active layer thickness retrieval method over qinghai-tibet permafrost using insar technology: with emphasis on two-dimensional deformation and unfrozen water |
publisher |
Elsevier |
publishDate |
2023 |
url |
https://doi.org/10.1016/j.jag.2023.103530 https://doaj.org/article/0d068ecbee9e491cb8069217ca733900 |
genre |
Active layer thickness permafrost |
genre_facet |
Active layer thickness permafrost |
op_source |
International Journal of Applied Earth Observations and Geoinformation, Vol 124, Iss , Pp 103530- (2023) |
op_relation |
http://www.sciencedirect.com/science/article/pii/S1569843223003540 https://doaj.org/toc/1569-8432 1569-8432 doi:10.1016/j.jag.2023.103530 https://doaj.org/article/0d068ecbee9e491cb8069217ca733900 |
op_doi |
https://doi.org/10.1016/j.jag.2023.103530 |
container_title |
International Journal of Applied Earth Observation and Geoinformation |
container_volume |
124 |
container_start_page |
103530 |
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1784887406916272128 |