Distribution and changes of active layer thickness (ALT) and soil temperature (TTOP) in the source area of the Yellow River using the GIPL model

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• 作者：DongLiang Luo (1)
  Jin HuiJun (1)
  Sergei Marchenko (1) (2)
  Vladimir Romanovsky (2)
  
• 关键词：GIPL model ; active layer thickness ; TTOP ; degradation of permafrost
• 刊名：Science China Earth Sciences
• 出版年：2014
• 出版时间：August 2014
• 年：2014
• 卷：57
• 期：8
• 页码：1834-1845
• 全文大小：2,476 KB
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• 作者单位：DongLiang Luo (1)
  Jin HuiJun (1)
  Sergei Marchenko (1) (2)
  Vladimir Romanovsky (2)
  
  1. State Key Laboratory of Frozen Soils Engineering, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou, 730000, China
  2. Geophysical Institute, University of Alaska Fairbanks, Fairbanks, Alaska, 99775, USA
  
• ISSN：1869-1897

文摘

Active layer thickness (ALT) is critical to the understanding of the surface energy balance, hydrological cycles, plant growth, and cold region engineering projects in permafrost regions. The temperature at the bottom of the active layer, a boundary layer between the equilibrium thermal state (in permafrost below) and transient thermal state (in the atmosphere and surface canopies above), is an important parameter to reflect the existence and thermal stability of permafrost. In this study, the Geophysical Institute Permafrost Model (GIPL) was used to model the spatial distribution of and changes in ALT and soil temperature in the Source Area of the Yellow River (SAYR), where continuous, discontinuous, and sporadic permafrost coexists with seasonally frozen ground. Monthly air temperatures downscaled from the CRU TS3.0 datasets, monthly snow depth derived from the passive microwave remote-sensing data SMMR and SSM/I, and vegetation patterns and soil properties at scale of 1:1000000 were used as input data after modified with GIS techniques. The model validation was carried out carefully with ALT in the SAYR has significantly increased from 1.8 m in 1980 to 2.4 m in 2006 at an average rate of 2.2 cm yr?. The mean annual temperature at the bottom of the active layer, or temperature at the top of permafrost (TTOP) rose substantially from ?.1°C in 1980 to ?.6°C in 2006 at an average rate of 0.018°C yr?. The increasing rate of the ALT and TTOP has accelerated since 2000. Regional warming and degradation of permafrost has also occurred, and the changes in the areal extent of regions with a sub-zero TTOP shrank from 2.4×104 to 2.2×104 km2 at an average rate of 74 km2 yr?. Changes of ALT and temperature have adversely affected the environmental stability in the SAYR.