Snow cover influences the thermal regime of active layer in Urumqi River Source, Tianshan

Snow cover influences the thermal regime of active layer in Urumqi River Source, Tianshan Mountains,

China

ZHAO Jing-yi;CHEN Ji;WU Qing-bai;HOU Xin

【期刊名称】《山地科学学报（英文版）》 【年(卷),期】2018(015)012

【摘要】Snow cover is characterized by the high albedo,low thermal conductivity,and

notable

heat

transition

during

phase

changes.Thus,snow cover significantly affects the ground thermal regime.A comparison of the snow cover in high latitudes or high-altitude snowy mountain regions indicates that the eastern Tianshan Mountains (China) show a characteristically thin snow cover (snow depth below 15 cm) with remarkable temporal variability.Based on snow depth,heat flux,and ground temperature from 2014 to 2015 in the Urumqi River source,the spatialtemporal characteristics of snow cover and snow cover influences on the thermal conditions of active layer in the permafrost area were analyzed.During the autumn (Sept.-Oct.),thin and discontinuoussnow cover can noticeably accelerate the exothermic process of the ground,producing a cooling effect on the shallow soil.During the winter (Nov.-Mar.),it is inferred that the effective thermal insulation starts with snow depth exceeding 10 cm during early winter.However,the snow depth in this area is generally below 15

cm,and the resulting snow-induced thermal insulation during the winter is very limited.Due to common heavy snowfalls in the spring (Apr.to May),the monthly mean snow thickness in April reached to 15 cm and remained until mid-May.Snow cover during the spring significantly retarded the ground wanning.Broadly,snow cover in the study area exerts a cooling effect on the active layer and plays a positive role in the development and preservation of permafrost. 【总页数】15页(2622-2636) 【关键词】

【作者】ZHAO Jing-yi;CHEN Ji;WU Qing-bai;HOU Xin

【作者单位】State Key Laboratory of Frozen Soil Engineering, Northwest Institute of Eco-environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China;University of Chinese Academy of Sciences, Beijing 100049, China;Beiluhe Observation and Research Station on Frozen soil Engineering and Environment in Qinghai-Tibet Plateau, Northwest Institute of Eco-environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China;State Key Laboratory of Frozen Soil Engineering, Northwest Institute of Eco-environment and Resources,

Chinese

Academy

of

Sciences,

Lanzhou

730000,

China;Beiluhe Observation and Research Station on Frozen soil Engineering and Environment in Qinghai-Tibet Plateau, Northwest Institute of Eco-environment and Resources, Chinese Academy of

Sciences, Lanzhou 730000, China;State Key Laboratory of Frozen Soil Engineering, Northwest Institute of Eco-environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China;State Key Laboratory of Frozen Soil Engineering, Northwest Institute of Eco-environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China;University of Chinese Academy of Sciences, Beijing 100049, China;Beiluhe Observation and Research Station on Frozen soil Engineering and Environment in Qinghai-Tibet Plateau, Northwest Institute of Eco-environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China 【正文语种】英文 【中图分类】 【文献来源】

https://www.zhangqiaokeyan.com/academic-journal-cn_journal-mountain-science_thesis/0201270234685.html 【相关文献】

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