Energy Conversion Rate from Subinertial Surface Tides to Internal Tides

被引:5
作者
Tanaka, Yuki [1 ]
机构
[1] Fukui Prefectural Univ, Fac Marine Sci & Technol, Obama, Japan
基金
日本学术振兴会;
关键词
Diapycnal mixing; Internal waves; Kelvin waves; Rossby waves; Topographic effects; Tides; COASTAL-TRAPPED WAVES; BAROCLINIC TIDES; TIDAL CONVERSION; DIURNAL TIDES; ENERGETICS; CIRCULATION; GENERATION; WATER; SEA; DISSIPATION;
D O I
10.1175/JPO-D-22-0201.1
中图分类号
P7 [海洋学];
学科分类号
0707 ;
摘要
Subinertial, topographically trapped diurnal internal tides are an important energy source for turbulent mix-ing in the subarctic oceans. However, their generation may not be estimated by the conventional barotropic-to-baroclinic conversion because their vertical structure is sometimes barotropic, unlike superinertial internal tides that are always baroclinic. Here, a new energy diagram is presented, in which the barotropic mode is decomposed into the surface and topo-graphic modes, with the latter being classified as part of the internal modes together with the baroclinic mode. The energy equation for the newly defined topographic mode is then derived, providing an appropriate formulation of the energy con-version rate from the subinertial surface tides to the topographically trapped internal tides. A series of numerical experi-ments confirm that the formulation successfully predicts the energy conversion rate for various cases, with the relative contribution of the baroclinic and topographic modes varying significantly depending on the bottom topography and stratifi-cation. Furthermore, this surface-to-internal conversion is demonstrated to give a significantly larger estimate than the baro-tropic-to-baroclinic conversion for subinertial tides. Applying the formulation to the results of a realistic numerical simulation in the Kuril Straits, an area with the strongest mixing due to subinertial diurnal tides, shows that the surface mode is converted into the baroclinic and topographic modes with comparable magnitudes, responsible for most of the en-ergy dissipation in this area. These results indicate the need to reestimate the global distribution of the generation rate of the subinertial internal tides using our new formulation and to clarify their dissipation mechanisms.
引用
收藏
页码:1355 / 1374
页数:20
相关论文
共 98 条
  • [31] A New Parameterization of Turbulent Mixing Enhanced Over Rough Seafloor Topography
    Hibiya, Toshiyuki
    [J]. GEOPHYSICAL RESEARCH LETTERS, 2022, 49 (02)
  • [32] The impacts of ocean bottom roughness and tidal flow amplitude on abyssal mixing
    Hibiya, Toshiyuki
    Ijichi, Takashi
    Robertson, Robin
    [J]. JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS, 2017, 122 (07) : 5645 - 5651
  • [33] Sea Level and the Role of Coastal Trapped Waves in Mediating the Influence of the Open Ocean on the Coast
    Hughes, Chris W.
    Fukumori, Ichiro
    Griffies, Stephen M.
    Huthnance, John M.
    Minobe, Shoshiro
    Spence, Paul
    Thompson, Keith R.
    Wise, Anthony
    [J]. SURVEYS IN GEOPHYSICS, 2019, 40 (06) : 1467 - 1492
  • [34] Tidal Conversion and Dissipation at Steep Topography in a Channel Poleward of the Critical Latitude
    Hughes, Kenneth G.
    Klymak, Jody M.
    [J]. JOURNAL OF PHYSICAL OCEANOGRAPHY, 2019, 49 (05) : 1269 - 1291
  • [35] HUTHNANCE JM, 1978, J PHYS OCEANOGR, V8, P74, DOI 10.1175/1520-0485(1978)008<0074:OCTWAA>2.0.CO
  • [36] 2
  • [37] Iwamae N., 2010, NUMERICAL STUDY K1 I
  • [38] Parameterizing tidal dissipation over rough topography
    Jayne, SR
    St Laurent, LC
    [J]. GEOPHYSICAL RESEARCH LETTERS, 2001, 28 (05) : 811 - 814
  • [39] Energetics of Barotropic and Baroclinic Tides in the Monterey Bay Area
    Kang, Dujuan
    Fringer, Oliver
    [J]. JOURNAL OF PHYSICAL OCEANOGRAPHY, 2012, 42 (02) : 272 - 290
  • [40] Role of localized mixing around the Kuril Straits in the Pacific thermohaline circulation
    Kawasaki, Takao
    Hasumi, Hiroyasu
    [J]. JOURNAL OF GEOPHYSICAL RESEARCH-OCEANS, 2010, 115