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Freeze-thaw cycles and snow impact at arid permafrost region in Chajnantor Volcano, Atacama, northern Chile

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Title: Freeze-thaw cycles and snow impact at arid permafrost region in Chajnantor Volcano, Atacama, northern Chile
Authors: Mena, Gabriela Browse this author
Yoshikawa, Kenji Browse this author
Schorghofer, Norbert Browse this author
Pasten, Cesar Browse this author
Ochoa, Felipe Agustin Browse this author
Yoshii, Yuzuru Browse this author
Doi, Mamoru Browse this author
Miyata, Takeshi Browse this author
Takahashi, Hidenori Browse this author
Casassa, Gino Browse this author
Sone, Toshio Browse this author →KAKEN DB
Keywords: Permafrost
freeze–thaw cycle
high elevation
Issue Date: 2-Jan-2021
Publisher: Taylor & Francis
Journal Title: Arctic antarctic and alpine research
Volume: 53
Issue: 1
Start Page: 60
End Page: 66
Publisher DOI: 10.1080/15230430.2021.1878739
Abstract: Permafrost occurs in the high Atacama Desert, and its thermal state was characterized at a study site 5,075 m a.s.l., at the lower regional altitude boundary for permafrost. The permafrost body is about 5 m thick and located in the hydrothermal alteration zone. The freeze-thaw layer and upper part of the permafrost layer temperatures were measured at 0 to 39 cm depth at 1-cm resolution throughout the year. The upper 3 cm of the ground experienced more than 100 freeze-thaw cycles in 2019. The maximum thaw depth was 14 cm. No significant thermal offset is observed between the annual mean of the surface temperature and the top permafrost boundary. The 14-m borehole reveals that the geothermal gradient was quite high at 200 degrees C/km. In 2019 the seventy days of snow cover impacted the surface energy budget. Winter and summer snow conditions contribute to cooling the surface temperature regime in different ways.
Type: article
Appears in Collections:低温科学研究所 (Institute of Low Temperature Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

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