Spring soil moisture‐precipitation feedback in the Southern Great Plains: How is it related to large‐scale atmospheric conditions?
Spring soil moisture‐precipitation feedback in the Southern Great Plains: How is it related to large‐scale atmospheric conditions?
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DOI：
10.1002/2013gl058931
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发表时间：
2014-02
影响因子：
5.2
通讯作者：
H. Su;Zong‐Liang Yang;R. Dickinson;Jiangfeng Wei
中科院分区：
文献类型：
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作者：
H. Su;Zong‐Liang Yang;R. Dickinson;Jiangfeng Wei
The Southern Great Plains (SGP) has been shown as a region of significant soil moisture‐precipitation (S‐P) coupling. However, how strong evapotranspiration (ET) can affect regional precipitation remains largely unclear, impeding a full grasp of the S‐P feedback in that area. The current study seeks to unravel, in a spring month (April), the potential role played by large‐scale atmospheric conditions in shaping S (ET)‐P feedback. Our regional climate modeling experiments demonstrate that the presence of anomalous low (high) pressure and cyclonic (anticyclonic) flows at the upper/middle troposphere over the relevant areas is associated with strongest (minimum) positive S‐P feedback in the SGP. Their impacts are interpreted in terms of large‐scale atmospheric dynamical disturbance, including the intensity and location of synoptic eddies. Further analyses of the vertical velocity fields corroborate these interpretations. In addition, the relationship between lower tropospheric moisture conditions (including winds) and feedback composites is evaluated.
