Effect of air-sea heat exchange on seasonal transport variation of the Kuroshio

Sakamoto, Toshihiro

doi:10.1357/0022240054307920

Cited by 4 publications

(1 citation statement)

References 18 publications

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“…It is noteworthy that Eq. ( 20) has essentially the same form as the energy conversion rate between the barotropic kinetic energy and the available potential energy of large-scale ocean currents over bottom topography in a planetary geostrophic system (Sakamoto 2005;Sakamoto and Umetsu 2006). It can be shown that Eq.…”

Section: B Variable Density Oceanmentioning

confidence: 99%

Energy Conversion Rate from Subinertial Surface Tides to Internal Tides

Tanaka

2023

Journal of Physical Oceanography

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Subinertial, topographically trapped diurnal internal tides are an important energy source for turbulent mixing 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 topographic 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 conversion rate from the subinertial surface tides to the topographically trapped internal tides. A series of numerical experiments 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 stratification. Furthermore, this surface-to-internal conversion is demonstrated to give a significantly larger estimate than the barotropic-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 energy dissipation in this area. These results indicate the need to re-estimate the global distribution of the generation rate of the subinertial internal tides using our new formulation and to clarify their dissipation mechanisms.

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Section: B Variable Density Oceanmentioning

confidence: 99%