The geography of semidiurnal mode-1 internal-tide energy loss

被引：69

作者：

Kelly, S. M. ^{[1
,2
]}

Jones, N. L. ^{[1
,2
]}

Nash, J. D. ^{[3
]}

Waterhouse, A. F. ^{[4
]}

机构：

[1] Univ Western Australia, Oceans Inst, Crawley, WA, Australia

[2] Univ Western Australia, Sch Environm Syst Engn, Crawley, WA, Australia

[3] Oregon State Univ, Coll Ocean & Atmospher Sci, Covallis, OR USA

[4] Univ Calif San Diego, Scripps Inst Oceanog, La Jolla, CA 92093 USA

来源：

GEOPHYSICAL RESEARCH LETTERS | 2013年 / 40卷 / 17期

基金：

美国国家科学基金会;

关键词：

tides; internal tides; physical oceanography; energy dissipation; internal waves; WAVE PROPAGATION; GLOBAL PATTERNS; KAENA RIDGE; DEEP-OCEAN; GENERATION; TOPOGRAPHY; SCATTERING; BREAKING; SURFACE;

D O I：

10.1002/grl.50872

中图分类号：

P [天文学、地球科学];

学科分类号：

07 ;

摘要：

The semidiurnal mode-1 internal tide receives 0.1-0.3 TW from the surface tide and is capable of propagating across ocean basins. The ultimate fate of mode-1 energy after long-distance propagation is poorly constrained by existing observations and numerical simulations. Here, global results from a two-dimensional semi-analytical model indicate that topographic scattering is inefficient at most locations deeper than 2500 m. Next, results from a one-dimensional linear model with realistic topography and stratification create a map of mode-1 scattering coefficients along the continental margins. On average, mode-1 internal tides lose about 60% of their energy upon impacting the continental margins: 20% transmits onto the continental shelf, 40% scatters to higher modes, and 40% reflects back to the ocean interior. These analyses indicate that the majority of mode-1 energy is likely lost at large topographic features (e.g., continental slopes, seamounts, and mid-ocean ridges), where it may drive elevated turbulent mixing.

引用

页码：4689 / 4693

页数：5