Influence of the upper gravity-wave damping layer on precipitation over complex terrain

The upper boundary condition of a numerical model can significantly influence the model prediction results. This study used the Weather Research and Forecasting model to introduce the Rayleigh damping layer in the complex terrain of southern Gansu, China. Sensitivity tests are conducted for a strong...

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Bibliographic Details
Published inFrontiers in environmental science Vol. 10
Main Authors Duan, H. X., Zhang, T. J., Gong, C. S., Zhou, G. L., Zhu, WeiWei
Format Journal Article
LanguageEnglish
Published Frontiers Media S.A 10.11.2022
Subjects
complex terrain
energy flux
precipitation
upper gravity-wave absorption
WRF model
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Summary:The upper boundary condition of a numerical model can significantly influence the model prediction results. This study used the Weather Research and Forecasting model to introduce the Rayleigh damping layer in the complex terrain of southern Gansu, China. Sensitivity tests are conducted for a strong precipitation process that occurred in 2016. Meanwhile, the effects of the upper gravity-wave damping layer and vertical velocity damping term of different schemes are explored. The results show that the upper gravity-wave damping layer can effectively reduce the error caused by false gravity waves in the complex terrain of southern Gansu Province. Moreover, the applicability of this model in the complex terrain of northwestern China is discussed. Overal, prediction of the precipitation area and intensity is improved. Specifically, the introduction of an implicit gravity-wave damping layer has a more significant damping effect on the upwardly propagating gravity-wave.
ISSN:2296-665X
2296-665X
DOI:10.3389/fenvs.2022.1044969