Abstract
The exchange of energy and water between the lithosphere and atmosphere mainly takes place at the ground surface. Therefore, freeze/thaw condition at the ground surface is an important factor in examining the interactions between the land surface and atmosphere. Based on the observation data obtained by CEOP/CAMP-Tibet, the diurnal freeze/thaw cycles of the ground surface near Naqu, central Tibetan Plateau was preliminarily analyzed. The results show that the surface layer was completely frozen for approximately one month. However, the time that the ground surface experienced diurnal freeze/thaw cycles was about 6 months. The high frequency of freeze/thaw cycles at the ground surface significantly influences water and energy exchanges between ground and atmosphere over half a year. The interaction processes between the ground and atmosphere under different soil conditions (such as complete thaw, complete freeze and diurnal freeze/thaw cycles) are issues worthy of further examination.
References
Li S, Nan Z, Zhao L. Impact of soil freezing and thawing process on thermal exchange between atmosphere and ground surface. J Glaciol Geocryol (in Chinese), 2002, 24(5): 506–511
William P J, Smith M W. The Frozen Earth: Fundamentals of Geocryology. Cambridge: Cambridge University Press, 1989. 306
Zhang T, Armstrong R L. Soil freeze/thaw cycles over snow-free land detected by passive microwave remote sensing. Geophys Res Lett, 2001, 28(5): 763–766
Wegmuller U. The effect of freezing and thawing on the microwave signatures of bare soil. Rem Sens Environ, 1990, 33: 123–135
Kim E J, England A W. Passive microwave freeze/thaw classification fro wet tundra regions. Transactions IEEE, 1996, 2267–2269
Kimball J J, McDonald K C, Keyser A R, et al. Application on the NASA scatterometer (NSCAT) for determining the daily frozen and nonfrozen landscape of Alaska. Rem Sen Environ, 2001, 75(1): 113–126
Smith N V, Saatchi S S, Randerson J T. Trends in high northern latitude soil freeze and thaw cycles from 1988 to 2002. J Geophy Res, 2004, 109(D12101): 1–14
Gao R, Wei Z, Dong W. Variation of the snow and frozen soil over Qinghai-Xizang Plateau in the late twentieth century and their relations to climatic change. Plateau Meteorol (in Chinese), 2003, 22(2): 191–196
Ding Y, Ye B, Liu S, et al. Monitoring of frozen soil hydrology in macro-scale in Qinghai-Xizang Plateau. Chin Sci Bull, 45(12): 208–214
Zhao L, Cheng G, Li S, et al. The freezing and thawing processes in active layerof permafrost near Wudaoliang, Qinghai-Xizang (Tibet) Plateau. Chin Sci Bull, 2000, 45(11): 1205–1210
Yang M, Yao T, Gou X. The soil thawing-freezing processes and water-energy distribution along the Qinghai-Xizang (Tibet) Plateau. Prog Nat Sci, 2000, 10(5): 443–450.
Yang M, Yao T, Gou X, et al. The soil moisture distribution, thawing-freezing processes and their effects on the seasonal transition on the Qinghai-Xizang (Tibetan) Plateau. J Asian Earth Sciences, 2003, 21: 457–465
Schimek J P, Clein J S. Microbial response to freeze-thaw cycles in tundra and taiga soils. Soil Biol Biochem, 1996, 28:1061–1066
Larsen K, Jonasson S, Michelsen A. Repeated freeze-thaw cycles and their effects on biological processes in two arctic ecosystem types. Appl Soil Ecol, 2002, 21:187–195
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Supported by the National Key Basic Research Program (Grant No. 2005CB422004), the National Natural Science Foundation of China (Grant No. 40571036), the Century Program of CAS (Grant No. 2004401) and the Talent Program of CAREERI, CAS
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Yang, M., Yao, T., Gou, X. et al. Diurnal freeze/thaw cycles of the ground surface on the Tibetan Plateau. CHINESE SCI BULL 52, 136–139 (2007). https://doi.org/10.1007/s11434-007-0004-8
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DOI: https://doi.org/10.1007/s11434-007-0004-8