Nonlinear Equilibration of Thermohaline Intrusions
Nonlinear Equilibration of Thermohaline Intrusions
复制标题
温盐侵入的非线性平衡
DOI：
10.1175/1520-0485(1998)028
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发表时间：
1998
期刊：
影响因子：
--
通讯作者：
B. Ruddick
中科院分区：
文献类型：
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作者：
David A. Walsh;B. Ruddick
摘要 使用一维数值模型研究了宽前沿温盐侵入的非线性行为。该模型用于跟踪入侵场从无穷小幅度到以温度和盐度反演为特征的大幅度状态的演变。因此，可以将图尔和格奥尔基等人的分析研究扩展到大振幅，考虑到振幅相关扩散率的影响，以及随着入侵的增长，水体中出现稳定分层、扩散分层和静态不稳定区域。模型运行用无限小的扰动进行初始化，这些扰动随时间呈指数增长，直到发生温度和盐度的反转。反转出现后，侵入物向平衡状态演化，其中摩擦力平衡浮力，对于指状和扩散感觉基本状态分层都是如此。这些平衡状态的特点是静态不稳定......
Abstract The nonlinear behavior of thermohaline intrusions on a wide front is investigated using a one-dimensional numerical model. The model is used to follow the evolution of a field of intrusions from infinitesimal amplitude to a large-amplitude state characterized by inversions in temperature and salinity. It is thus possible to extend the analytical studies of Toole and Georgi and others to large amplitude, allowing for the effects of amplitude-dependent diffusivities, and for the appearance of stably stratified, diffusively stratified, and statically unstable regions in the water column as the intrusions grow. The model runs are initialized with infinitesimal disturbances that grow exponentially in time until inversions in temperature and salinity occur. After inversions appear, the intrusions evolve toward an equilibrium state in which friction balances buoyancy forces, for both finger- and diffusive-sense basic-state stratifications. These equilibrium states are characterized by statically unstabl...