Evaluation of Regional-Scale Soil Moisture-Surface Flux Dynamics in Earth System Models Based on Satellite Observations of Land Surface Temperature
Evaluation of Regional-Scale Soil Moisture-Surface Flux Dynamics in Earth System Models Based on Satellite Observations of Land Surface Temperature
复制标题
基于地表温度卫星观测的地球系统模型中区域尺度土壤水分-表面通量动力学评估
DOI：
10.1029/2019gl082962
复制
发表时间：
2019
影响因子：
5.2
通讯作者：
Gallego-Elvira B
中科院分区：
文献类型：
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作者：
Gallego-Elvira B
在地球系统模式（ESM）中，缺乏高质量的全球观测来评估土壤干燥对地表通量的影响。在这里，我们使用了一种新的诊断方法，该方法基于干旱期间观察到的土地相对于大气的变暖（相对变暖率，RWR）来评估ESM。的ESM表明，RWR是很好的相关性在整个干旱期的感热和潜热之间的表面能量的分配的变化。因此，观测和模拟RWR之间的比较揭示了模型无法捕捉现实的土壤水热通量关系。结果表明，在一般情况下，模式模拟干旱区的干旱期ET动态，而在大陆性气候区的蒸发分数的减少出现过度的一些模式。我们的方法可以帮助指导陆地模型的开发，这些方面是模拟热浪等极端事件的关键。
There is a lack of high‐quality global observations to evaluate soil drying impacts on surface fluxes in Earth system models (ESMs). Here we use a novel diagnostic based on the observed warming of the land relative to the atmosphere during dry spells (relative warming rate, RWR) to assess ESMs. The ESMs show that RWR is well correlated with changes in the partition of surface energy between sensible and latent heat across dry spells. Therefore, comparisons between observed and simulated RWR reveal where models are unable to capture a realistic soil moisture‐heat flux relationship. The results show that in general, models simulate dry spell ET dynamics well in arid zones while decreases in evaporative fraction appear excessive in some models in continental climate zones. Our approach can help guide land model development in aspects that are key in simulating extreme events like heat waves.