Modelling Soil Moisture in Hyper-Arid Conditions
Modelling Soil Moisture in Hyper-Arid Conditions
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DOI：
10.1007/s10546-020-00596-9
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发表时间：
2021-01
影响因子：
4.3
通讯作者：
Y. Shao;K. Fraedrich;M. Ishizuka
中科院分区：
文献类型：
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作者：
Y. Shao;K. Fraedrich;M. Ishizuka
在大多数地表模型中，土壤湿度的演变受土壤水力过程的控制。在极度干旱的土壤中，这些过程会被破坏，但土壤湿度继续表现出明显的时间变化，这表明其他过程可能在起作用。我们假设此类土壤中的水分由于土壤蒸发和空气-土壤界面处的蒸汽通量而变化。为了测试这一点，我们将空气和土壤之间的水蒸气交换纳入地表模型中，将该模型应用于沙漠地区，并比较模拟和观测的土壤湿度。模拟和观察之间的良好一致性证实了我们的假设。利用模型结果，我们研究了土壤水分和土壤汽相之间的相互作用以及土壤汽相对表面能量平衡的影响。
In most land-surface models, the evolution of soil moisture is governed by soil-hydraulic processes. In hyper-arid soils, these processes break down, but soil moisture continues to show clear temporal variations, suggesting that other processes may be at work. We hypothesize that moisture in such soils varies due to evaporation in the soil and to vapour fluxes at the air–soil interface. To test this, we include vapour exchange between the air and soil in a land-surface model, apply the model to a desert site, and compare the simulated and observed soil moisture. The good agreement between the simulations and observations confirms our hypothesis. Using the model results, we examine the interactions between the soil-moisture and soil-vapour phases and influences of the soil-vapour phase on the surface energy balance.