Permafrost changes in the northwestern Da Xing’anling Mountains, Northeast China in the past decade
Under a pronounced climate warming, permafrost has been degrading in most areas, but it is still unclear in the northwestern part of the Da Xing’anling Mountains, Northeast China. According to a ten-year observation of permafrost and active-layer temperatures, the multi-year average of mean annual g...
| Main Authors: | , , , , , , |
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| Format: | Text |
| Language: | English |
| Published: |
2022
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| Subjects: | |
| Online Access: | https://doi.org/10.5194/essd-2022-85 https://essd.copernicus.org/preprints/essd-2022-85/ |
| Summary: | Under a pronounced climate warming, permafrost has been degrading in most areas, but it is still unclear in the northwestern part of the Da Xing’anling Mountains, Northeast China. According to a ten-year observation of permafrost and active-layer temperatures, the multi-year average of mean annual ground temperatures at 20 m was -2.83, -0.94, -0.80, -0.70, -0.60 and -0.49 °C, respectively, at Boreholes GH4, MG3, MG1, MG2, GH5 and YTLH2, with the depths of permafrost table varying from 1.1 to 7.0 m. Ground cooling at shallow depths has been detected, resulting in declining thaw depths in Yituli’he during 2009–2020, possibly due to relatively stable mean positive air temperature and declining snow cover and dwindling local population. In most study areas (e.g., Mangui and Genhe), permafrost warming is particularly pronounced at larger depths (even at 80 m). These results can provide important information for regional development and engineering design and maintenance. |
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