On the behaviour of the residence time at the bottom of the mixed layer
On the behaviour of the residence time at the bottom of the mixed layer
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DOI：
10.1007/s10652-006-9003-6
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发表时间：
2006-12-01
影响因子：
2.2
通讯作者：
Delhez, Eric J. M.
中科院分区：
文献类型：
--
作者：
Deleersnijder, Eric;Beckers, Jean-Marie;Delhez, Eric J. M.
为了理解为什么Deleersnijder等人[（2006），Environ Fluid Mech 6：25-42]的发现--在密斜岩处混合层中的停留时间不一定为零--与Delhez和Deleersnijder [（2006），Ocean Dyn 56：139-150]-在控制域中的停留时间在该控制域的开放边界处消失-，有必要考虑包括密度跃层的一部分的控制域，其中假设涡流扩散率为零。然后，根据附近的混合层的底部的涡流扩散率的行为，可以看出，在混合层和密度跃层之间的界面处的停留时间表现出不连续性。如果存在这种不连续性，则停留时间在前者中为非零，而在后者中为零。这是说明下的涡流扩散率是恒定的混合层的假设下得到的解析解。
To understand why the findings of Deleersnijder et al. [(2006), Environ Fluid Mech 6: 25-42]-the residence time in the mixed layer in not necessarily zero at the pycnocline-are consistent with those of Delhez and Deleersnijder [(2006), Ocean Dyn 56:139-150]-the residence time in a control domain vanishes at the open boundaries of this control domain-, it is necessary to consider a control domain that includes part of the pycnocline, in which the eddy diffusivity is assumed to be zero. Then, depending on the behaviour of the eddy diffusivity near the bottom of the mixed layer, the residence time may be seen to exhibit a discontinuity at the interface between the mixed layer and the pycnocline. If such a discontinuity exists, the residence time is non-zero in the former and zero in the latter. This is illustrated by analytical solutions obtained under the assumption that the eddy diffusivity is constant in the mixed layer.