资源环境科技发展态势分析平台

The controlling factors of the interannual variability of extreme precipitation are examined on a global scale. We quantify the moisture (thermodynamic) and vertical motion (dynamic) contributions to the interannual variability of extreme precipitation by applying a physical scaling diagnosis. The thermodynamic contribution is small and the dynamic contribution dominates the interannual variability of extreme precipitation. We further apply a quasi-geostrophic diagnosis on extreme precipitation to decompose the vertical motion and its variability into components due to the large-scale adiabatic perturbations (dry dynamics) and the diabatic heating feedback (moist dynamics). The variability of vertical motion associated with large-scale adiabatic perturbations is approximate twice that of the diabatic heating feedback. These results highlight the dominant role of the large-scale adiabatic perturbations on the year-to-year variability of extreme precipitation, in contrast to the responses of extreme precipitation to global warming, in which both the large-scale adiabatic perturbations and diabatic heating feedback are important.