Numerical simulation of mean currents and water property anomalies at Endeavour Ridge: Hydrothermal versus topographic forcing
Numerical simulation of mean currents and water property anomalies at Endeavour Ridge: Hydrothermal versus topographic forcing
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奋进海脊平均水流和水性质异常的数值模拟：热液与地形强迫
DOI：
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
M. Anisimov
中科院分区：
文献类型：
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作者：
R. Thomson;M. Subbotina;M. Anisimov
[1] 基于真实海底地形的数值模拟用于检查东北太平洋胡安德富卡海脊（奋进海脊）奋进段区域的近海底洋流。结果支持了早期的发现，即约 2200 米深的轴向山谷内的热液喷发，而不是地形改变的盆地规模的跨脊地转流，导致了山谷范围内观察到的近乎稳定的向北洋流。尽管它不会在山谷内产生深层水流，但盆地规模的环流决定了热液羽流一旦上升到山脊顶部之后的水平重新分布。对近底部温度和盐度场的模拟表明，包含深向西背景流的模型运行最接近地再现了山脊上方观测到的羽流异常分布，表明该地区的底部流主要是向西的，与水柱上半部风驱动的加利福尼亚洋流盛行的东南流相反。
[1] Numerical simulations based on realistic seafloor topography are used to examine near-bottom currents in the region of the Endeavour segment of Juan de Fuca Ridge (Endeavour Ridge) in the northeast Pacific. Results support earlier findings that hydrothermal venting within the ∼2200-m deep axial valley, rather than topographically modified, basin-scale cross-ridge geostrophic flow, is responsible for the near-steady northward currents observed within the confines of the valley. Although it does not generate deep flow within the valley, the basin-scale circulation determines the horizontal redistribution of the hydrothermal plumes once they rise above the ridge crest. Simulations of the near-bottom temperature and salinity fields reveal that model runs that incorporate a deep westward background flow most closely reproduce the observed plume anomaly distributions above the ridge, indicating that bottom currents in the region are predominantly westward, counter to the prevailing southeasterly flow of the wind-driven California Current in the upper half of the water column.