Impact of an Artificial Cold Pool Inside the Eye of Typhoon Jebi (2018): A Numerical Study Using the Nonhysdrostatic Icosahedroal Model (NICAM)

This study investigates the impact of an artificial cold pool, generated via artificial evaporative cooling, placed at the center of Typhoon Jebi (2018), using Nonhydrostatic Icosahedral Atmospheric Model (NICAM). We conducted numerical experiments by introducing rainwater into the planetary boundary layer to induce cooling in the lower atmosphere, thereby modifying or suppressing convection. The rainwater forcing intensity corresponds to potential cooling rates of 1 K h ^-1 and 10 K h ^-1 (assuming uniform evaporation), applied over cylindrical radii of 5 km and 50 km. These configurations represent both plausible human-intervention scales and idealized high-intensity forcing scenarios that significantly exceed current technological capabilities. Results show that the minimum sea level pressure (MSLP) increases (indicating weakening) between 10 and 36 h of integration. However, the impact on the 10-m wind speeds is less pronounced. The most significant response occurred with 10K h ^-1 cooling and a 50 km radius with a well-defined cold pool and clear weakening in MSLP. While appreciable impacts are observed under extreme forcing, the effects remain localized and relatively small within the range of feasible human intervention. Possible refinements to these strategies, such as increasing the number of cold pools or targeting their placement within the eyewall, are discussed. (Lee, M., and M. Satoh, 2026: Impact of an Artificial Cold Pool Inside the Eye of Typhoon Jebi (2018) at its peak intensity: A Numerical Study Using the Nonhysdrostatic Icosahedroal Model (NICAM). SOLA , 26 , xxx-xxx, doi:10.2151.sola.2026-nnn.)