基于CLM模式的青藏高原土壤冻融过程陆面特征研究

发布时间：2018-05-25 02:29

本文选题：土壤冻融 + 模拟试验　；参考：《冰川冻土》2017年04期

【摘要】：使用位于青藏高原东部若尔盖站的观测数据驱动CLM3.5模式,设计一组去除模式中冻融过程的"退化试验",进行为期一年的模拟研究。通过对比原试验与敏感性试验模拟结果,初步分析冻融过程在土壤温度变化、各能量通量分配中的作用,得到以下结论:(1)冻融过程是土壤温度变化的"缓冲器",冻结过程向周围环境释放能量减缓了土壤降温的速率,使土壤温度不至降得太低,而消融过程从周围环境吸收能量减缓了土壤升温的速率,使土壤温度不至升高太多;(2)冻融过程改变了地表辐射通量,土壤冻结改变了地表反照率,改变了向上短波辐射,且由于冻结过程减缓了地表温度的下降,改变了地表向上长波辐射,进而改变了净辐射通量;(3)冻融过程显著地改变了陆面能量的分配,通过相变能量的释放和吸收增大了地气间能量的传输,显著地增大了地表土壤热通量,且通过改变地表温度和地表蒸发,改变了感热及潜热通量。在冻结过程及完全冻结阶段,感热及潜热通量均增大,但在消融过程阶段,感热及潜热通量均减小。冻融过程对土壤热通量及感热通量的影响在冻结过程及完全冻结阶段更为显著,而对潜热的影响则是在消融过程阶段更为显著。
[Abstract]:A set of "degradation tests" for freeze-thaw removal processes in the CLM3.5 model driven by observation data at the Joergai Station in the eastern part of the Tibetan Plateau were designed for a year's simulation. The effects of freeze-thaw process on soil temperature and energy flux distribution were analyzed by comparing the simulation results of the original test and the sensitivity test. The freeze-thaw process is a "buffer" for the change of soil temperature. The release of energy from the freezing process to the surrounding environment slows down the rate of soil cooling and keeps the soil temperature from falling too low. However, the absorption of energy from the surrounding environment slows down the rate of soil warming, so that the soil temperature does not rise too much.) the freezing and thawing process changes the surface radiation flux, the soil freezing changes the surface albedo and the upward shortwave radiation. Because the freezing process slows down the decrease of the surface temperature, changes the upward long wave radiation of the surface, and then changes the net radiation flux, the freeze-thaw process significantly changes the distribution of land surface energy. Through the release and absorption of phase change energy the transfer of energy between the earth and atmosphere was increased and the soil heat flux was significantly increased and the sensible heat flux and latent heat flux were changed by changing the surface temperature and surface evaporation. The sensible and latent heat fluxes increased during the freezing process and the complete freezing stage, but decreased during the ablation process. The effects of freezing and thawing on soil heat flux and sensible heat flux were more significant in freezing process and complete freezing stage, while the effect on latent heat was more significant in ablation process.
【作者单位】：常州市气象局;中国科学院西北生态环境资源研究院寒旱区陆面过程与气候变化重点实验室;成都信息工程大学大气科学学院高原大气与环境四川省重点实验室;南京信息工程大学气象灾害预报预警与评估协同创新中心;
【基金】：国家自然科学基金项目(91537104;41375077;91537214;41405088)资助
【分类号】：P642.14

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