Convective Building of a Pycnocline: Laboratory Experiments
Convective Building of a Pycnocline: Laboratory Experiments
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密斜层的对流形成：实验室实验
DOI：
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发表时间：
1996
期刊：
影响因子：
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通讯作者：
P. Rhines
中科院分区：
文献类型：
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作者：
D. Pierce;P. Rhines
本文用一个实验模式研究了跃层的对流结构，该模型的一端是咸水，另一端是淡水。在储罐中形成了一个深循环，通过反复穿过密集的、下降的羽流，使内部液体均质。一层薄而新鲜的表层将有效浮力通量发展并修改为密集的羽流，导致内部速度下降到中间时间的最小值。在稠密源下增加底部地形，极大地减少了下行羽流所经历的夹带量。在这种情况下，水箱充满了一层又深又重的层，这导致羽状物从水箱底部“抬起”，并在水柱中依次向更高的深度下沉。一个简单的数值“羽流”模型表明，这不可能是一个稳定的状态，因为它不处于扩散平衡；羽流最终必须返回到水箱底部，并为内部水域通风。添加旋转会增加曲面...
Abstract The convective building of a pycnocline is examined using a laboratory model forced by surface fluxes of saline water at one end and fresh water at the other. A deep recirculation evolves in the tank, which homogenizes the interior fluid by repeated passes through the dense, descending plume. A thin, fresh surface layer develops and modifies the effective buoyancy flux into the dense plume, causing the interior velocities to fall to an intermediate-time minimum. Adding bottom topography under the dense source greatly reduces the amount of entrainment that the descending plume undergoes. In this case, the tank fills with a deep, heavy layer, which causes the plume to “lift off” the bottom of the tank and detrain at successively higher depths in the water column. A simple numerical “plume” model shows that this cannot be a steady state, as it is not in diffusive balance; the plume must eventually return to the bottom of the tank and ventilate the interior waters. Adding rotation increases the surfa...