Shelf–Open Ocean Exchange Forced by Wind Jets
Shelf–Open Ocean Exchange Forced by Wind Jets
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DOI：
10.1175/jpo-d-17-0161.1
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发表时间：
2017-12
影响因子：
3.5
通讯作者：
M. Spall;J. Pedlosky
中科院分区：
文献类型：
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作者：
M. Spall;J. Pedlosky
本文用准地转理论和理想化的原始方程数值模式研究了由狭窄的跨陆架风急流强迫的从浅海陆架跨越陡峭地形到深海的交换的一般问题。格陵兰岛东南部狭窄的峡湾发出的下降风激发了人们的兴趣，尽管在世界各地的海洋中都发现了类似的地形限制风射流。由于没有风的净涡度输入，环流主要局限于强迫附近的区域。在大陆架上的流通是有限的弱分层流的底部摩擦，但分层允许更强的上层流动，由弱耦合到下层调节。在倾斜的地形上，地形β效应限制了深层流动，而为了充分分层，上层流动可以穿过地形，将大陆架连接到公海。这可以是一个有效的运输机制，即使是短，s...
AbstractThe general problem of exchange from a shallow shelf across sharp topography to the deep ocean forced by narrow, cross-shelf wind jets is studied using quasigeostrophic theory and an idealized primitive equation numerical model. Interest is motivated by katabatic winds that emanate from narrow fjords in southeast Greenland, although similar topographically constrained wind jets are found throughout the world’s oceans. Because there is no net vorticity input by the wind, the circulation is largely confined to the region near the forcing. Circulation over the shelf is limited by bottom friction for weakly stratified flows, but stratification allows for much stronger upper-layer flows that are regulated by weak coupling to the lower layer. Over the sloping topography, the topographic beta effect limits the deep flow, while, for sufficient stratification, the upper-layer flow can cross the topography to connect the shelf to the open ocean. This can be an effective transport mechanism even for short, s...