HydroThermal Dynamics of Frozen Soils on the Tibetan Plateau during 2015-2016

The hydrothermal dynamics of frozen soil were monitored at a typical meadow ecosystem on the Tibetan Plateau. Soil temperature/moisture profiles were automatically measured at a 30-min. interval by 5TM ECH2O probes (Decagon Devices, Inc., USA) installed at the following depths: 5 cm, 10 cm, 20 cm, 40cm, and 80 cm. The turbulent heat fluxes were measured by an eddy-covariance (EC) system (LI-COR 7500, Campbell Scientific). STEMMUS-FT (Simultaneous Transfer of Energy, Mass and Momentum in Unsaturated Soil with Freeze-Thaw process) model, with two control experiments (Ctrl1 for Van Genuchten hydraulic scheme and Ctrl2 for Clapp and Hornberger hydraulic scheme), was employed to reproduce the simultaneous movement of soil moisture and heat flow in the frozen soil. With the aid of physically based STEMMUS-FT model and in situ measurements, we can investigate the underlying mechanisms of the water and heat transfer in frozen soils.

本数据集针对青藏高原典型草甸生态系统的冻土水热动力学过程开展原位监测。布设于5 cm、10 cm、20 cm、40 cm及80 cm深度的5TM ECH2O传感器（美国Decagon Devices公司）以30分钟的时间间隔自动采集土壤温度与湿度剖面数据。湍流热通量由涡动协方差（EC）系统（LI-COR 7500，Campbell Scientific公司）测定。本研究采用考虑冻融过程的非饱和土壤能量、质量与动量同步传输模型（STEMMUS-FT，全称Simultaneous Transfer of Energy, Mass and Momentum in Unsaturated Soil with Freeze-Thaw process），设置两组对照试验（Ctrl1采用Van Genuchten水力学方案，Ctrl2采用Clapp与Hornberger水力学方案），以模拟冻土中土壤水分与热流的同步运移过程。结合基于物理机制的STEMMUS-FT模型与原位观测数据，可深入探究冻土水热传输的内在机制。