Modeling the large-scale influence of geothermal sources on abyssal flow
Modeling the large-scale influence of geothermal sources on abyssal flow
复制标题
模拟地热源对深海流的大规模影响
DOI：
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发表时间：
1987
期刊：
影响因子：
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通讯作者：
K. Speer
中科院分区：
文献类型：
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作者：
T. Joyce;K. Speer
本文给出了赤道β平面上连续层结深海层的近似温度摄动方程。垂直整合流是允许的，在本研究中，这是被迫由均匀的上升流。截断的垂直结构的解决方案，这是被迫由本地化的地热热源的代表。解表现出从被动平流到β羽流的一系列行为，取决于正压流速与长Rossby波相速度的比值。由于垂直模态的相速度不同，强迫垂直结构被分散，这可以导致源的上游和下游的正和负的温度异常。此外，很明显，与高纬度地区相比，赤道地区局部源影响“上游”条件的能力得到增强，在高纬度地区，背景流能够更好地平流输送下游的温度扰动。取决于在源处施加的温度异常的强度，总流场可能有也可能没有大规模的逆转。因此，温度，地转切变，和被动示踪剂，如3He之间的相关性可以是正的，负的，或零远离地热源。
An approximate temperature perturbation equation for a continuously stratified deep ocean layer on an equatorial β plane is presented. A vertically integrated flow is allowed, which in the present study is forced by uniform upwelling. Solutions with truncated vertical structure are presented which are forced by a representation of localized geothermal heat sources. Solutions exhibit a range of behavior from passive advection to β plume, depending on the ratio of barotropic flow speed to long Rossby wave phase speed. Owing to the different phase speeds of the vertical modes, the forced vertical structure is dispersed, which can result in positive and negative temperature anomalies both upstream and downstream of the source. Furthermore, it is clear that the ability of localized sources to influence “upstream” conditions is enhanced in equatorial regions compared with higher latitudes, where the background flow is better able to advect the temperature perturbations downstream. Depending on the strength of the imposed temperature anomaly at the source, there may or may not be a large-scale reversal of the total flow field. Thus the correlations between temperature, geostrophic shear, and a passive tracer such as 3He can be positive, negative, or zero away from the geothermal source.