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盐指是指热且多盐的水层位于冷且低盐的水层之上时， 在界面处发生盐度较大的水向下呈指状分布的现象。发生在海洋系统中密度跃层的盐指被认为是热量和盐度在垂直和水平方向混合分布的重要作用机制。中文名盐指外文名salt finger提出人H.E.赫珀