Effects of Marine Heat Waves on Rapid Intensification of Super Typhoon Hagibis (2019) and Jebi (2018)

Typhoon Jebi (2018) and Hagibis (2019) are the highest-impact super typhoons in the Northwest Pacific and both experienced rapid intensification (RI). However, Typhoon Hagibis intensified by 100 kt in 24 hours, one of the most rapidly intense in the Northwest Pacific and twice as rapid as Typhoon Jebi. Although both typhoons have favorable atmospheric conditions to develop into RI typhoons, the difference in the RI rate depends on whether the typhoon passes through the Marine Heat Wave (MHW) region. MHW is one of the oceanic extreme warming events and it affects the ocean dynamics and physical conditions. Therefore, we want to show how the difference in vertical ocean temperature due to the MHW affected the RI rate using the WRF-3DPWP (Price-Weller-Pinkel). The 3DPWP ocean mixed layer model is used to assess the changes in the vertical structure of the ocean that occur due to surface heat fluxes. We use the Argo data within a 10-degree radius of the RI occurrence point within 48 hours before the RI occurrence. We constructed two experiments conducted under the same atmospheric conditions (Hagibis (2019)) and put the different vertical ocean temperatures with MHW (Hagibis) and others without MHW (Jebi). Thus, we explain the processes of how the MHW events modulate the RI Typhoons.