[A-CG38] Dynamics of Oceanic and Atmospheric Waves, Vortices, and Circulations

[ACG38-09] The pathway of the Indonesian Throughflow transport increase due to tidal mixing

*Shiraishi Takeki¹, Shinichiro Kida², Hideharu Sasaki³, Ryo Furue³ (1.Kyushu University Interdisciplinary Graduate School of Engineering Sciences, 2.Research Institute for Applied Mechanics, Kyushu University, 3.Application Laboratory , Japan Agency for Marine-Earth Science and Technology)

Keywords:Indonesian Throughflow, Tidal mixing, OFES2

Indonesian through-flow (ITF) is an ocean current that passes through the Indonesian Seas from the Pacific Ocean to the Indian Ocean. In this area, vertical mixing is believed to be actively excited by the tide because the seafloor topography of the Indonesian Seas is complex. In Sakaki et al. (2018), the presence of a tidal mixing scheme was suggested to increase the ITF transport by 0.88 Sv. However, the mechanism of this increase. The mass balance of the increased transport due to tidal mixing was estimated by dividing the region around the Indonesian Seas into seven sections, such as the Celebes Sea, Makassar Strait, and the Molucca Sea. As a result, it was found that there are two main routes for the ITF increase. The first route is the upwelling that occurs within the Indonesian Seas (lower layer to upper layer). The second route is the upper layer flow from the eastern coast of the Philippines to the Makassar Strait. This second route is likely induced by tidal mixing that occurred in the Pacific Ocean.