辐散 （英语：divergence）是指空气从中心扩散的现象，通常在高压区发生。它的形成原因和辐合（convergence）的机制相似，只是方向相反。在高压区，空气由中心向外扩散，形成辐散现象。相反，在低压区，空气会向中心辐合，形成辐合现象。[1]
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