9:15 AM - 9:30 AM
[AOS29-02] Structure of the Transition Domain observed with drifting buoys
Keywords:transition domain, Isoguchi jet, drifting buoy observation, bottom topography
The trajectory of the drifting buoys visualized the flow structure around the Isoguchi jet (Isoguchi et al., 2006, Wagawa et al., 2014) and the transition domain. The frequency distribution of modelled particle trajectory shows the flow along the bottom topography in the west side of the transition domain and the flow via the gap of the bottom topography in the east side of the transition domain. These flow suggest seawater transport paths from the subtropical to the subarctic.
High frequency region is also distributed around 42°N – 155°E. The high frequency region corresponds to the swirling flow of the drifting buoys. The cause of the swirling flow may be barotropic flow with the small bottom topography located at 42.5°N – 157°E and baroclinic flow with baroclinic instability near the surface. The swirling flow may contribute to the seawater exchange between subtropical and subarctic in the transition domain.