Hydrothermal pattern of frozen soil in Nam Co lake basin,the Tibetan Plateau |
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| Authors: | Keming Tian Jingshi Liu Shichang Kang Iain B Campbell Fei Zhang Qianggong Zhang Wei Lu |
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| Institution: | (1) Institute of Tibetan Plateau Research, CAS, Shuangqing Road 18, Haidian District, Beijing, 100085, China;(2) State Key Laboratory of Cryospheric Science, CAREERI, CAS, Lanzhou, 730000, China;(3) Graduate University of Chinese Academy of Sciences, Beijing, 100039, China;(4) Land and Soil Consultancy Services, Nelson, 7011, New Zealand |
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| Abstract: | Hydrothermal processes and the regimes of frozen soil formed in alpine regions with glaciers and lake area are complex and
important for ecological environment but have not been studied in Tibet. Based on soil temperature and moisture data from
October 2005 to September 2006 collected in the Nam Co lake basin, Tibetan Plateau (TP), those questions were discussed. The
mean annual air temperature was −3.4°C with 8 months below 0°C. Air and soil temperature varied between −25.3~13.1°C and −10.3~8.8°C,
respectively. Soil moisture variations in the active layer were small with the minimum value of 1.4%, but were influenced
greatly by snowmelt, rainfall and evaporation, varying up to 53.8%. The active layer froze later, thawed earlier and was thinner,
however, the lower altitude limit of permafrost is higher than that in most areas of TP. The effects of soil moisture (unfrozen
water content) on soil temperature, which were estimated through proposed models, were more significant near ground surface
than the other layers. The surface soil temperature decreased with snowcover, the effect of cold snow meltwater infiltration
on soil thermal conditions was negligible, however, the effect of rainfall infiltration was evident causing thermal disruptions. |
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| Keywords: | Active layer Soil temperature Soil moisture Snow meltwater Rainfall |
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