scholarly journals Projected Changes in Permafrost Active Layer Thickness Over the Qinghai‐Tibet Plateau Under Climate Change

2019 ◽  
Vol 55 (9) ◽  
pp. 7860-7875 ◽  
Author(s):  
Dongsheng Zhao ◽  
Shaohong Wu
Keyword(s):  
Climate Change ◽  
Layer Thickness ◽  
Active Layer ◽  
Tibet Plateau ◽  
Active Layer Thickness ◽  
Projected Changes ◽  
Qinghai Tibet Plateau

scholarly journals ACTIVE LAYER THICKNESS RETRIEVAL OVER THE QINGHAI-TIBET PLATEAU FROM 2000 TO 2020 BASED ON INSAR-MEASURED SUBSIDENCE AND MULTI-LAYER SOIL MOISTURE

2021 ◽  
Vol XLIII-B3-2021 ◽  
pp. 437-442
Author(s):  
T. Chang ◽  
J. Han ◽  
Z. Li ◽  
Y. Wen ◽  
T. Hao ◽  
...  
Keyword(s):  
Soil Moisture ◽  
Layer Thickness ◽  
Active Layer ◽  
Surface Deformation ◽  
Tibet Plateau ◽  
Active Layer Thickness ◽  
Permafrost Region ◽  
Radar Images ◽  
Soil Moisture Data ◽  
Qinghai Tibet Plateau

Abstract. Active layer thickness (ALT) is an important index to reflect the stability of permafrost. The retrieval of ALT based on Interferometric Synthetic Aperture Radar (InSAR) technology has been investigated recently in permafrost research. However, most of such studies are carried out in a limited extend and relatively short temporal coverage. The combination of temporal-spatial multi-layer soil moisture data and multi-temporal InSAR is a promising approach for the large-scale characterization of ALT. In this study, we employed Small Baseline Subset Interferometry (SBAS-InSAR) technology to obtain the seasonal surface deformation from radar images of Envisat and Sentinel-1 in a permafrost region of Qinghai-Tibet Plateau (QTP). We attempt to verify and calibrate the temporal-spatial multi-layer soil moisture product in combination with the in-situ data. Based on the land subsidence data and the temporal-spatial multi-layer soil moisture data, we further improve method to retrieve the ALT information. This paper describes the progress so far and point out the future work.

Active layer thickness calculation over the Qinghai–Tibet Plateau

2009 ◽  
Vol 57 (1) ◽  
pp. 23-28 ◽  
Author(s):  
Qiangqiang Pang ◽  
Guodong Cheng ◽  
Shuxun Li ◽  
Wengang Zhang
Keyword(s):  
Layer Thickness ◽  
Active Layer ◽  
Tibet Plateau ◽  
Active Layer Thickness ◽  
Qinghai Tibet Plateau

scholarly journals Permafrost Degradation within Eastern Chukotka CALM Sites in the 21st Century Based on CMIP5 Climate Models

Geosciences ◽  
2019 ◽  
Vol 9 (5) ◽  
pp. 232 ◽  
Author(s):  
Alexey Maslakov ◽  
Natalia Shabanova ◽  
Dmitry Zamolodchikov ◽  
Vasili Volobuev ◽  
Gleb Kraev
Keyword(s):  
Climate Change ◽  
Layer Thickness ◽  
Active Layer ◽  
21St Century ◽  
Climate Models ◽  
Climate Scenario ◽  
Active Layer Thickness ◽  
Climate Change Scenarios ◽  
Permafrost Degradation ◽  
Degradation Rates

Permafrost degradation caused by contemporary climate change significantly affects arctic regions. Active layer thickening combined with the thaw subsidence of ice-rich sediments leads to irreversible transformation of permafrost conditions and activation of exogenous processes, such as active layer detachment, thermokarst and thermal erosion. Climatic and permafrost models combined with a field monitoring dataset enable the provision of predicted estimations of the active layer and permafrost characteristics. In this paper, we present the projections of active layer thickness and thaw subsidence values for two Circumpolar Active Layer Monitoring (CALM) sites of Eastern Chukotka coastal plains. The calculated parameters were used for estimation of permafrost degradation rates in this region for the 21st century under various IPCC climate change scenarios. According to the studies, by the end of the century, the active layer will be 6–13% thicker than current values under the RCP (Representative Concentration Pathway) 2.6 climate scenario and 43–87% under RCP 8.5. This process will be accompanied by thaw subsidence with the rates of 0.4–3.7 cm∙a−1. Summarized surface level lowering will have reached up to 5 times more than current active layer thickness. Total permafrost table lowering by the end of the century will be from 150 to 310 cm; however, it will not lead to non-merging permafrost formation.

scholarly journals Modelling and mapping climate change impacts on permafrost at high spatial resolution for an Arctic region with complex terrain

2013 ◽  
Vol 7 (4) ◽  
pp. 1121-1137 ◽  
Author(s):  
Y. Zhang ◽  
X. Wang ◽  
R. Fraser ◽  
I. Olthof ◽  
W. Chen ◽  
...  
Keyword(s):  
Climate Change ◽  
Layer Thickness ◽  
Spatial Resolution ◽  
Active Layer ◽  
Complex Terrain ◽  
Climate Change Impacts ◽  
Arctic Region ◽  
Slope Aspect ◽  
Active Layer Thickness ◽  
Topographic Effects

Abstract. Most spatial modelling of climate change impacts on permafrost has been conducted at half-degree latitude/longitude or coarser spatial resolution. At such coarse resolution, topographic effects on insolation cannot be considered accurately and the results are not suitable for land-use planning and ecological assessment. Here we mapped climate change impacts on permafrost from 1968 to 2100 at 10 m resolution using a process-based model for Ivvavik National Park, an Arctic region with complex terrain in northern Yukon, Canada. Soil and drainage conditions were defined based on ecosystem types, which were mapped using SPOT imagery. Leaf area indices were mapped using Landsat imagery and the ecosystem map. Climate distribution was estimated based on elevation and station observations, and the effects of topography on insolation were calculated based on slope, aspect and viewshed. To reduce computation time, we clustered climate distribution and topographic effects on insolation into discrete types. The modelled active-layer thickness and permafrost distribution were comparable with field observations and other studies. The map portrayed large variations in active-layer thickness, with ecosystem types being the most important controlling variable, followed by climate, including topographic effects on insolation. The results show deepening in active-layer thickness and progressive degradation of permafrost, although permafrost will persist in most of the park during the 21st century. This study also shows that ground conditions and climate scenarios are the major sources of uncertainty for high-resolution permafrost mapping.

scholarly journals Modelling and mapping climate change impacts on permafrost at high spatial resolution for a region with complex terrain

2012 ◽  
Vol 6 (6) ◽  
pp. 4599-4636
Author(s):  
Y. Zhang ◽  
X. Wang ◽  
R. Fraser ◽  
I. Olthof ◽  
W. Chen ◽  
...  
Keyword(s):  
Climate Change ◽  
Layer Thickness ◽  
Spatial Resolution ◽  
Active Layer ◽  
Complex Terrain ◽  
High Spatial Resolution ◽  
Climate Change Impacts ◽  
Active Layer Thickness ◽  
Topographic Effects ◽  
Field Observations

Abstract. Most spatial modelling of climate change impacts on permafrost has been conducted at half-degree latitude/longitude or coarser spatial resolution. At such coarse resolution, topographic effects on insolation cannot be considered accurately and the modelling results are difficult to use for land managers and ecologists. Here we mapped climate change impacts on permafrost from 1968 to 2100 at 10 m resolution using a process-based model for Ivvavik National Park, a region with complex terrain in northern Yukon, Canada. Soil and drainage conditions were defined based on ecosystem types, which were mapped using SPOT imagery, a digital elevation model and field observations. Leaf area indices were mapped using Landsat imagery and the ecosystem map. Climate distribution was estimated based on elevation and station observations, and the effects of topography on insolation were estimated based on slope, aspect and viewshed. To reduce computation time, we clustered climate distribution and topographic effects on insolation into discrete types. The modelled active-layer thickness and permafrost distribution were comparable with field observations and other studies, demonstrating that it is practical to model and map climate change impacts on permafrost at high spatial resolution for areas with complex terrain. The map portrayed large variations in active-layer thickness, with ecosystem types being the most important controlling variable, followed by climate, including topographic effects on insolation. This study also shows that climate scenarios and ground conditions are the major sources of uncertainty for high resolution permafrost mapping.

scholarly journals High Spatial Resolution Modeling of Climate Change Impacts on Permafrost Thermal Conditions for the Beiluhe Basin, Qinghai-Tibet Plateau

2019 ◽  
Vol 11 (11) ◽  
pp. 1294 ◽  
Author(s):  
Jing Luo ◽  
Guoan Yin ◽  
Fujun Niu ◽  
Zhanju Lin ◽  
Minghao Liu
Keyword(s):  
Climate Change ◽  
Climate Change Impacts ◽  
Tibet Plateau ◽  
Ecosystem Change ◽  
Active Layer Thickness ◽  
Climate Projections ◽  
Permafrost Degradation ◽  
Thermal Dynamics ◽  
Discontinuous Permafrost ◽  
Qinghai Tibet Plateau

Permafrost is degrading on the Qinghai-Tibet Plateau (QTP) due to climate change. Permafrost degradation can result in ecosystem changes and damage to infrastructure. However, we lack baseline data related to permafrost thermal dynamics at a local scale. Here, we model climate change impacts on permafrost from 1986 to 2075 at a high resolution using a numerical model for the Beiluhe basin, which includes representative permafrost environments of the QTP. Ground surface temperatures are derived from air temperature using an n-factor vs Normalized Differential Vegetation Index (NDVI) relationship. Soil properties are defined by field measurements and ecosystem types. The climate projections are based on long-term observations. The modelled ground temperature (MAGT) and active-layer thickness (ALT) are close to in situ observations. The results show a discontinuous permafrost distribution (61.4%) in the Beiluhe basin at present. For the past 30 years, the permafrost area has decreased rapidly, by a total of 26%. The mean ALT has increased by 0.46 m. For the next 60 years, 8.5–35% of the permafrost area is likely to degrade under different trends of climate warming. The ALT will probably increase by 0.38–0.86 m. The results of this study are useful for developing a deeper understanding of ecosystem change, permafrost development, and infrastructure development on the QTP.

scholarly journals Simulated response of the active layer thickness of permafrost to climate change

2020 ◽  
pp. 100007
Author(s):  
Ruichao Li ◽  
Jinbo Xie ◽  
Zhenghui Xie ◽  
Junqiang Gao ◽  
Binghao Jia ◽  
...  
Keyword(s):  
Climate Change ◽  
Layer Thickness ◽  
Active Layer ◽  
Active Layer Thickness
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