Figure 5
From: A naturally-occurring ‘cold earth’ spot in Northern China
Simulated ground temperature fields (Unit: °C) in summer and winter and air flow field in the ‘cold’ scree slope.
(a) Circular isotherms in the blocky layer in February and holes in the heat vent from hoar developing snow cover indicate heat exchange is controlled by air convection in winter, the photograph was taken on March 9, 2012. (b) Parallel isotherms in August indicate that heat exchange is dominated by conduction in summer and the photograph taken on August 6, 2011 shows that trees are sparse in the low ground temperature region enclosed by red boundary. (c) The simulated air flow field in the vertical profile of the main part of the blocky slope in winter.
