Energy Conversion, Mixing Energy, and Neutral Surfaces with a Nonlinear Equation of State
Energy Conversion, Mixing Energy, and Neutral Surfaces with a Nonlinear Equation of State
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具有非线性状态方程的能量转换、混合能量和中性面
DOI：
10.1175/2010jpo4250.1
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发表时间：
2011
影响因子：
3.5
通讯作者：
J. Nycander
中科院分区：
文献类型：
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作者：
J. Nycander
定义了局部中性面，使得沿该平面绝热移动一小段距离的水团继续具有与周围水相同的密度。由于这样的位移不会改变密度场或重力势能，因此通常认为它不会产生恢复浮力。然而，由于状态方程的非线性(特别是温压效应)，这种中性位移伴随着内能E和引力势能U之间的转换，以及U和动能K之间的相等转换。这意味着位移实际上需要一个力。结果还表明，与矢量P垂直的位移不会引起U和K之间的转换，因此不需要力。类似于中性曲面，其定义为近似...
Abstract A local neutral plane is defined so that a water parcel that is displaced adiabatically a small distance along the plane continues to have the same density as the surrounding water. Since such a displacement does not change the density field or the gravitational potential energy, it is generally assumed that it does not produce a restoring buoyancy force. However, it is here shown that because of the nonlinear character of the equation of state (in particular the thermobaric effect) such a neutral displacement is accompanied by a conversion between internal energy E and gravitational potential energy U, and an equal conversion between U and kinetic energy K. While there is thus no net change of U, K does change. This implies that a force is in fact required for the displacement. It is further shown that displacements that are orthogonal to a vector P do not induce conversion between U and K, and therefore do not require a force. Analogously to neutral surfaces, which are defined to be approximate...