台風強度・構造変化における台風海洋相互作用の役割

Abstract

Studies on tropical cyclone (TC)-ocean interactions have usually addresses decreases in sea surface temperature by passage of TCs and the effects on TCs. This study also addresses the effect of changes in sea surface temperature on atmospheric environments that affect TCs. Case studies on TCs in 2018 were conducted by using the results of numerical simulation by a nonhydrostatic atmosphere model and an atmosphere-wave ocean coupled model. The intensity change of simulated Typhoon Trami (2018) was affected by decreases in sea surface temperature and tropical cyclone heat potential although the impact of the simulated track was not significant. The track of simulated Typhoon Jongdari (2018) was influenced by upper tropospheric cold low affected by changes in atmospheric environments caused by ocean coupling. However, the difference in atmospheric initial conditions more strongly affected the track simulations and simulated structural changes.