Stratified Abyssal Flow in the Presence of Fractured Ridges
Stratified Abyssal Flow in the Presence of Fractured Ridges
复制标题
存在断裂山脊的层状深渊流
DOI：
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发表时间：
1994
期刊：
影响因子：
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通讯作者：
J. Pedlosky
中科院分区：
文献类型：
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作者：
J. Pedlosky
摘要研究了当海洋盆地部分被下层经向屏障阻挡时，由特定上升流进入温跃层驱动的线性两层深海流动模型。这个屏障代表了大洋中脊，而脊的终点与南北盆地边界之间的空间代表了穿透大多数脊系统的缝隙。研究发现，深流只被障壁部分阻挡。大量气流以带状射流的形式穿过间隙。被高压脊阻挡的那部分气流在高压脊以东形成一个再循环的气旋式环流，其纬度范围通常小于高压脊的不间断区间。环流的整体结构和阻塞程度与约束环流的强大积分条件有关。虽然较弱，但在高压脊上方的无阻塞层中也经常发现类似的再循环。
Abstract A linear, two-layer model for abyssal flow driven by a specified upwelling into the thermocline is studied when the ocean basin is partially blocked by a meridional barrier in the lower layer. The barrier is meant to represent a midoceanic ridge, and the space between the termination points of the ridge and the northern and southern basin boundaries represents the gaps that pierce most ridge systems. It is found that the deep flow is only partially blocked by the barrier. A substantial flow threads through the gaps in the form of zonal jets. The portion of the flow that is blocked by the ridge produces a recirculating, cyclonic gyre east of the ridge, and its latitudinal extent is typically smaller than the unbroken interval of the ridge. The overall structure of the recirculation and the degree of blocking are related to robust integral conditions constraining the circulation around the ridge. Although weaker, a similar recirculation is often found in the unblocked layer above the ridge as an up...