The Cross-Slope Transport of Momentum by Internal Waves Generated by Alongslope Currents over Topography
The Cross-Slope Transport of Momentum by Internal Waves Generated by Alongslope Currents over Topography
复制标题
地形上顺坡流产生的内波动量的跨坡传递
DOI：
--
复制
发表时间：
1996
期刊：
影响因子：
--
通讯作者：
S. Thorpe
中科院分区：
文献类型：
--
作者：
S. Thorpe
摘要 流经大陆坡上足够长度（通常小于 10 公里）的地形的顺坡流会产生内背风波。它们主要将动量带向较浅的水域，即沿着斜坡向上并穿过陆架断裂带，并到达大陆架，至少在夏季，分层允许它们传播时。分析结果表明，即使产生的背风波的群速度分量指向较深的水域，倾斜海床的反射也可能导致转向较浅的水域。数值模型用于检查内波传播并量化其跨陆架断裂处的动量通量。在此处考虑的条件下，f/N<1 和倾斜角度 α a 接近 5 度，通量由每单位长度下坡的应力（沿陆架折断的单位垂直面积的动量通量）参数化，τ*，由 τ* = kρ0VNh2 cos4(β + β0) 给出，其中 po 是平均水密度，V...
Abstract The alongslope currents flowing over topography of sufficiently length scale, typically less than 10 km, on the continental slopes generate internal lee waves. These carry their momentum predominently toward shallower water, that is up the slope toward and across the shelf break, and onto the continental shelf, at least when, in summer, stratification permits their propagation. Analytical results show that even when the lee waves are generated with a component of their group velocity directed toward deeper water, reflection at the sloping seabed may lead to a turning toward shallower water. A numerical model is used to examine internal wave propagation and to quantify the flux of their momentum across the shelf break. In the conditions consiidered here with f/N≪1 and slope angle, α a, near 5 deg, the flux is parameterized by a stress (momentum flux per unit vertical area along the shelf break) per unit length downslope,.τ*, given by τ* = kρ0VNh2 cos4(β + β0), where po is the mean water density, V...