摘要
利用1998年5月1日至9月18日狮泉河自动气象站(AWS)的观测资料作为强迫场,运用改进的陆面过程模式CoLM(Common Land Model),对青藏高原西部的陆面特征进行了模拟研究.结果表明,该模式能够较好地模拟出高原地区的陆面特征.在高原西部地表能量平衡过程中,感热通量占主要地位,潜热通量较小,但在高原西部的湿季,潜热通量也是不可忽略的.在5月及6月初表层土壤频繁的发生水分相变,使土壤在相变过程中不断地吸收和释放潜热.降水及土壤表层频繁的冻结-消融使地表有效通量(感热+潜热)发生变化.有效辐射中的感热、潜热的分配,即Bowen会发生变化,进一步影响到对大气的加热及大气水汽输送情况,大气状况的改变又反过来影响地表蒸散及土壤持水能力,使土壤水分状态和含量发生变化.
The observational data from 1 May to 18 September 1998 collected by Automatic Weather Station installed in Shiquanhe of the Western Tibetan Plateau are analyzed. The land surface processes on the Tibetan Plateau are simulated by an improved land surface model （Common Land Model）, which can present the surface thermal condition tendency under observation data forcing. In the Western Tibetan Plateau, the sensible heat flux dominates the heat energy balance in summer, followed by the latent heat fluxes. But during the rain season, the latent heat flux can not be ignored. Phase change of surface soil water takes place often, resulting in soil absorbing and releasing latent heat frequently. Moreover, surface-released effective thermal fluxes （sensible and latent heat） follow the change in precipitation, freezing and thawing, and so does their Bowen ratio. As a result, the situation of atmosphere heating and transportation of atmospheric vapor will be affected. In return, the changed atmosphere will affect the soil water content due to the variation of land surface evapotranspiration and soil water containing capacity.
出处
《冰川冻土》
CSCD
北大核心
2007年第1期73-81,共9页
Journal of Glaciology and Geocryology
基金
国家自然科学基金项目(40575037
90202014
40575032)
中国气象局成都高原气象开放基金项目资助
关键词
青藏高原西部陆面过程
CoLM模式
模拟试验
Bowen比
land surface processes in the Western Tibetan Plateau
Common Land Model~ Bowen ration
simulating test
