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Subsurface heat conduction along the CHINARE traverse route, East Antarctica

Citation

Yang, D and Ding, M and Allison, I and Zou, X and Chen, X and Heil, P and Zhang, W and Bian, L and Xiao, C, Subsurface heat conduction along the CHINARE traverse route, East Antarctica, Journal of Glaciology pp. 1-12. ISSN 0022-1430 (2022) [Refereed Article]


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DOI: doi:10.1017/jog.2022.97

Abstract

Using data from three automatic weather stations (LGB69, Eagle and Dome A) from distinctly different climatological zones along the CHINARE (Chinese National Antarctic Research Expedition) traverse route from Zhongshan Station to Dome A, we investigated the characteristics of meteorological conditions and subsurface heat conduction. Spatial analysis indicated decreasing trends in air temperature, relative humidity and wind speed from the coastal katabatic wind zone to the inland plateau region, and air temperatures clearly showed a strong daily variability in winter, suggesting the effect from the fluctuation in the Antarctic atmospheric system. We also analyzed the optimal response time of the 1 and 3 m depth snow temperatures to the 0.1 m depth snow temperature for each site under clear/overcast and day/night situations. This showed an important enhancement to the heat transfer from shortwave radiation penetration. Using an iterative optimization method, we estimated the subsurface heat conduction variations along the transect. This was ~35 W m2. Multiple maxima in daily mean subsurface fluxes were found in winter, with a typical value above 2 W m2, while a single minimum value under 2 W m2 was found in summer. On an annual scale, a larger mean loss of subsurface heat conduction was observed in the inland plateau compared to in the coastal katabatic area. Finally, we discussed the possible influences of turbulent and radiant transport on the vertical heat response and confirmed the wind enhancement on the growth of thermal conductivity. This preliminary study provides a brief perspective and an important reference for studying subsurface heat conduction in inland areas of Antarctica.

Item Details

Item Type:Refereed Article
Keywords:atmosphere, ice, ocean interactions, energy balance, ice-sheet modeling
Research Division:Earth Sciences
Research Group:Climate change science
Research Field:Climatology
Objective Division:Environmental Policy, Climate Change and Natural Hazards
Objective Group:Understanding climate change
Objective Field:Effects of climate change on Antarctic and sub-Antarctic environments (excl. social impacts)
UTAS Author:Allison, I (Dr Ian Allison)
UTAS Author:Heil, P (Dr Petra Heil)
ID Code:154899
Year Published:2022
Deposited By:Australian Antarctic Program Partnership
Deposited On:2023-01-18
Last Modified:2023-01-18
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