利用水期模拟研究斜压不稳定引起的近底辐合:近底辐合

Q1 Earth and Planetary Sciences Journal of Geophysical Research Pub Date : 2018-03-01 DOI:10.1002/2017jc013561
Wenxia Zhang, R. Hetland
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引用次数: 0

摘要

侧向密度梯度斜压失稳让位给侧向浮力输运,往往导致浮力输运的辐合。在一个倾斜的底部,诱导辐合可以迫使底部水向上延伸。利用三维理想模型研究了涡输运引起的底部辐合和由此产生的底部悬浮层的性质。由于德克萨斯-路易斯安那陆架上侵入的独特特征,为了确定参数对涡旋传输强度的影响,进行了一系列的配置。本研究采用“水平斜率汉堡数”作为主导参数;其中S为斜率Burger数,d为斜率参数,Ri为理查德森数,理查德森数之前被证明是预测大陆架斜压不稳定强度的参数。侵入向内部扩散,靠近一个以垂向分层退化为特征的层;底部边界层的增厚与侵入体重合,通常在侵入体的任何边缘变薄,因为密度屏障与密集的等斜线有关。在对数尺度上,随着S - H的增大,辐合强度减弱,底部示踪剂通量线性减小,底边界层行为特征和沿岸流的反转特征趋于消失。
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A Study of Baroclinic Instability Induced Convergence Near the Bottom Using Water Age Simulations: NEAR-BOTTOM CONVERGENCE
Baroclinic instability of lateral density gradients gives way to lateral buoyancy transport, which often results in convergence of buoyancy transport. Along a sloping bottom, the induced convergence can force upward extension of bottom water. Eddy transport induced convergence at the bottom and the consequent suspended layers of bottom properties are investigated using a three-dimensional idealized model. Motivated by the distinct characteristics of intrusions over the Texas-Louisiana shelf, a series of configura-tions are performed with the purpose of identifying parameter impacts on the intensity of eddy transport. This study uses the ‘‘horizontal slope Burger number’’ as the predominant parameter; the parameter is func-tioned with S H 5 SRi 2 1 = 2 5 d = Ri to identify formation of baroclinic instability, where S is the slope Burger number, d is the slope parameter, and Ri is the Richardson number, previously shown to be the parameter that predicts the intensity of baroclinic instability on the shelf. Intrusion spreads into the interior abutting a layer that is characterized by degraded vertical stratification; a thickening in the bottom boundary layer colocates with the intrusion, which usually thins at either edge of the intrusion because of a density barrier in association with concentrated isopycnals. The intensity of convergence degrades and bottom tracer fluxes reduce linearly with increased S H on logarithmic scales, and the characteristics of bottom boundary layer behavior and the reversal in alongshore current tend to vanish.
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来源期刊
Journal of Geophysical Research
Journal of Geophysical Research 地学-地球科学综合
CiteScore
5.80
自引率
0.00%
发文量
0
审稿时长
1 months
期刊介绍: Journal of Geophysical Research (JGR) publishes original scientific research on the physical, chemical, and biological processes that contribute to the understanding of the Earth, Sun, and solar system and all of their environments and components. JGR is currently organized into seven disciplinary sections (Atmospheres, Biogeosciences, Earth Surface, Oceans, Planets, Solid Earth, Space Physics). Sections may be added or combined in response to changes in the science.
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