Modeling the large-scale influence of geothermal sources on abyssal flow
摘要:
An approximate temperature perturbation equation for a continuously stratified deep ocean layer on an equatorial 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 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.
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关键词:
Theoretical or Mathematical/ geophysical fluid dynamics oceanic crust oceanography seawater terrestrial heat/ submarine geothermal sources deep ocean dynamics positive temperature anomalies upstream anomalies downstream anomalies 3He plumes background flow temperature perturbations advection geostrophic shear abyssal flow approximate temperature perturbation equation continuously stratified deep ocean layer equatorial beta plane vertically integrated flow uniform upwelling truncated vertical structure passive advection beta plume barotropic flow speed long Rossby wave phase speed vertical modes forced vertical structure negative temperature anomalies equatorial regions higher latitudes imposed temperature anomaly large-scale reversal total flow field/ A9135D Terrestrial heat A9150E Seafloor processes A9210B Physical properties of seawater A9210D Dynamics of the deep ocean
DOI:
10.1029/JC092iC03p02843
被引量:
年份:
1987
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