对爱琴海基克拉泽斯高原南缘通过收缩区和海底高地的水流和密度观测 - 东地中海

IF 1.9 4区 地球科学 Q2 GEOCHEMISTRY & GEOPHYSICS Dynamics of Atmospheres and Oceans Pub Date : 2024-04-26 DOI:10.1016/j.dynatmoce.2024.101460
Harilaos Kontoyiannis , Larry J. Pratt , Vassilis Zervakis , Mathew H. Alford , Sarantis Sofianos , Alexander Theocharis
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引用次数: 0

摘要

2004 年秋季进行的 CTD/ADCP/海面漂流勘测显示,一股中尺度单向流来自南部深度达 1000 米的克里特海,进入北部基克拉迪大陆架的一个类似通道的区域,形成一个收缩,导致海底抬升(岩床深度达 100 米),最后在岩床左侧返回克里特海。水流在岩壁上游/下游减速/加速。沿岸密度等值线在到达崖壁之前,靠近崖壁底部的密度等值线升高,而在崖壁左侧的密度等值线则加深,表明存在超临界现象。在实际分层和无旋转的情况下,长波内波速度高于断面平均流速,表明存在亚临界状态。造成这一明显矛盾的关键因素是台阶高度较大,可能会增加台阶对水流施加的体力(阻力),同时在台阶上游也观察到水流阻塞现象。
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Current and density observations on a flow through a contraction and over a bottom elevation at the southern edge of the Cycladic Plateau in the Aegean Sea – East Mediterranean

A CTD/ADCP/surface-drifter survey in fall 2004 reveals the behaviour of a mesoscale unidirectional flow coming from the Cretan sea in the south with depths ∼1000 m and entering a channel-like area of the Cycladic shelf in the north, that forms a contraction which leads to a bottom elevation (sill depth ∼100 m), and finally returning into the Cretan Sea in the lee-side of the sill. The flow decelerates/accelerates upstream/downstream of the sill. The along-stream density contours near the sill bottom are raised prior to reaching the sill, while they deepen in the lee side of it indicating supercriticality. The long-wavelength internal wave speeds with realistic stratification and no-rotation are higher than the section averaged flow speeds and indicate subcriticality. A key element in this apparent paradox is the large height of the sill that potentially increases the body (drag) force exerted on the flow by the sill while flow blocking is also observed upstream of the sill.

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来源期刊
Dynamics of Atmospheres and Oceans
Dynamics of Atmospheres and Oceans 地学-地球化学与地球物理
CiteScore
3.10
自引率
5.90%
发文量
43
审稿时长
>12 weeks
期刊介绍: Dynamics of Atmospheres and Oceans is an international journal for research related to the dynamical and physical processes governing atmospheres, oceans and climate. Authors are invited to submit articles, short contributions or scholarly reviews in the following areas: •Dynamic meteorology •Physical oceanography •Geophysical fluid dynamics •Climate variability and climate change •Atmosphere-ocean-biosphere-cryosphere interactions •Prediction and predictability •Scale interactions Papers of theoretical, computational, experimental and observational investigations are invited, particularly those that explore the fundamental nature - or bring together the interdisciplinary and multidisciplinary aspects - of dynamical and physical processes at all scales. Papers that explore air-sea interactions and the coupling between atmospheres, oceans, and other components of the climate system are particularly welcome.
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