NDLI: The impact of surface energy exchange on the thawing process of active layer over the northern Qinghai

Content Provider	Springer Nature Link
Author	Li, Ren Zhao, Lin Wu, Tonghua Ding, Yongjian Xiao, Yao Hu, Guojie Zou, Defu Li, Wangping Yu, Wenjun Jiao, Yongliang Qin, Yanhui
Copyright Year	2014
Abstract	In this study, we collected radiation and active layer temperature data observed in the northern Qinghai–Xizang Plateau during the period 2006–2008 in order to analyze the impact of surface energy balance on the thawing process of the active layer. Results show that surface energy exhibits an obvious seasonal variation. The largest values of energy variables including global radiation, net radiation, soil heat flux and surface heat source intensity occur during June and July, while the smallest values occur in November and December. The active layer is generally dominated by an endothermic process. During the freeze–thaw period, the variation process of the active layer temperature is similar to that of surface energy. The seasonal thawing depth is closely related to the process of surface energy exchange. During the thawing period, seasonal thawing depth gradually increases as more solar energy enters the surface. When the surface energy accumulation is 0.0 MJ m$^{−2}$ d$^{−1}$, the seasonal thawing depth is the smallest. The seasonal thawing depth gradually increases with further accumulation of surface energy. Thus, the variation processes between the surface energy and seasonal thawing depth can be expressed by a power relation. The values of seasonal thawing depth calculated with the empirical relationship provided in this study agree well with the observed values. The relative error between calculated and observed values is less than 12 %. These results show that this empirical relationship can be successfully used to describe the behavior of active layers.
Starting Page	2091
Ending Page	2099
Page Count	9
File Format	PDF
ISSN	18666280
Journal	Environmental Earth Sciences
Volume Number	72
Issue Number	6
e-ISSN	18666299
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2014-02-25
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Energy exchange Thawing processes Active layer Qinghai–Xizang Plateau Geology Hydrology/Water Resources Geochemistry Environmental Science and Engineering Terrestrial Pollution Biogeosciences
Content Type	Text
Resource Type	Article
Subject	Global and Planetary Change Earth-Surface Processes Soil Science Environmental Chemistry Pollution Geology Water Science and Technology

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