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Evaluation of time series of soil moisture and soil temperature and computation of apparent thermal diffusivity of active layer in the Barton Peninsula, Antarctica

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Title
Evaluation of time series of soil moisture and soil temperature and computation of apparent thermal diffusivity of active layer in the Barton Peninsula, Antarctica
Other Titles
남극 바톤반도의 토양수분과 지온의 시계열적 특성 및 활동층의 열확산계수 산정
Authors
Kim, Chang-Seong
Lee, Jin-Yong
Kim, Heejung
Jeon, Woo-Hyun
Kim, Kitae
Keywords
soil moisture; soil temperature; time series analysis; apparent thermal diffusivity; active layer thickness
Issue Date
2020-10
Citation
Kim, Chang-Seong, et al. 2020. "Evaluation of time series of soil moisture and soil temperature and computation of apparent thermal diffusivity of active layer in the Barton Peninsula, Antarctica". 지질학회지, 56(5): 571-585.
Abstract
We have examined soil moisture and soil temperature of three sites in the Barton Peninsula, Antarctica. Auto-correlation, spectral analysis, and cross-correlation analysis were conducted using time series data. In addition, apparent thermal diffusivity was computed and active layer thickness was calculated. Soil moisture and soil temperature meters were installed at depths of 5, 10, 15, 20 cm, and measured every five minutes during summer 2019-2020. The soil moisture content was the largest at 20 cm depth at all sites. Rainfall below 0.5 mm/day could not affect the soil moisture content. The soil temperature in deeper depth was low. The soil temperature was above zero except for one day (December 20, 2019). The auto-correlation of soil moisture indicated shorter lag time at gradual slope and that of soil temperature indicated shorter lag time at shallower depth. The cycle of soil moisture was between 2.5 and 4.7 days, and the cycle of soil temperature was between 1.0 and 1.1 days. The cross-correlation of air temperature-soil temperature showed shorter lag time and larger correlation coefficient than that of solar radiation-soil temperature. The apparent thermal diffusivity (ATD) ranged from 0.01 to 121.94 mm2/sec (median=0.34-0.59 mm2/sec). The median values were close to that of minimum of previous study (0.4-3.3 mm2/sec) using same methods. The active layer thickness ranged from 23.6 to 38.6 cm. The ATD is smaller and active layer thickness is thinner than that near the coast (within 0.2 km) because the study area is located 1.5 km from the sea.
URI
https://repository.kopri.re.kr/handle/201206/11816
DOI
http://dx.doi.org/10.14770/jgsk.2020.56.5.571
Appears in Collections  
2020-2020, Investigation of ice microstructure properties for developing low-temperature purification and environment/energy materials (20-20) / Kim, Kitae (PE20030)
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