Preprints
https://doi.org/10.5194/essd-2022-85
https://doi.org/10.5194/essd-2022-85
 
25 Mar 2022
25 Mar 2022
Status: this preprint is currently under review for the journal ESSD.

Permafrost changes in the northwestern Da Xing’anling Mountains, Northeast China in the past decade

Xiaoli Chang1,2,, Huijun Jin2,3,, Ruixia He2, Yanlin Zhang1, Xiaoying Li4, Xiaoying Jin2, and Guoyu Li2 Xiaoli Chang et al.
  • 1School of Earth Science and Spatial Information Engineering, Hunan University of Science and Technology, Xiangtan, Hunan 411201, China
  • 2State Key Laboratory of Frozen Soils Engineering, Northwest Institute of Eco-Environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China
  • 3School of Civil Engineering, Institute of Cold-Regions Science and Engineering, and Northeast-China Observatory and Research-Station of Permafrost Geo-Environment (Ministry of Education), Northeast Forestry University, Harbin 150040, China
  • 4Key Laboratory of Sustainable Forest Ecosystem Management (Ministry of Education) and College of Forestry, Northeast Forestry University, Harbin 150040, China
  • These authors contributed equally to this work.

Abstract. 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.

Xiaoli Chang et al.

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on essd-2022-85', Anonymous Referee #1, 05 Apr 2022
  • CC1: 'Comment on essd-2022-85', Chenghai Wang, 23 Apr 2022
  • RC2: 'Comment on essd-2022-85', Anonymous Referee #2, 12 May 2022

Xiaoli Chang et al.

Data sets

Geotemperature observation data set of Genhe River (2012-2019) Chang, X. https://doi.org/10.11888/Geocry.tpdc.271752

Xiaoli Chang et al.

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Short summary
Based on the ten-year observation of seven deeper boreholes in Gen’he, Mangui and Yituli’he, a wide range of the mean annual ground temperatures at the depth of 20 m (-2.83 ~ -0.49 °C) and that of the annual maximum thaw depth (about 1.1 ~ 7.0 m) have been revealed. This study demonstrates that most trajectories of permafrost changes in Northeast China is ground warming and permafrost degradation, with only one exception in Yituli’he.