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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 | | Atacama | | snow |
| 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. |
| Rights: | https://creativecommons.org/licenses/by/4.0/ |
| Type: | article |
| URI: | http://hdl.handle.net/2115/80637 |
| 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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