15:45 〜 16:00
[AAS01-08] Understanding the Impact Cold Pools Have on an Approaching Typhoon Using the Non-hydrostatic Icosahedral Atmospheric Model (NICAM)
キーワード：Typhoon, Cold Pool, Intensity
The Moonshot project of the Typhoon Control Research is aiming for a safe and prosperous society. To achieve this feat, human intervention is needed to reduce the destructiveness of typhoons. Our project focuses on implementing artificial means to reduce the intensity of an approaching typhoon. One such method we employ is by introducing an artificial atmospheric cold pool. This cold pool is supposed to act as a barrier to convection where it would reduce the amount of heat being fed to the storm. Based on our previous work on using an artificial cold pool to reduce the intensity of an approaching typhoon, we will use more than one cold pool as a cooling source as opposed to one to see how the approaching cyclone responds to them. Experiments will be conducted on the stretched version of the non-hydrostatic icosahedral atmospheric model (NICAM) with a minimum grid spacing of 1.4km. The cold pools will be generated by evaporative cooling. The cooling sources will be circular, with heights of 1km and radii of 5km. To achieve a constant cooling rate of 10K/hr, we calculate that 4000 tonnes/hr of water would be needed to simulate the rain for the cooling sources. The cooling sources will be located within the radius of maximum wind where the wind should not exceed 20m/s. We will test several numbers of the forces that will be situated such that they form a ring-like structure inside the eyewall.
The typhoon that we will study is Typhoon Jebi and the model will run from 2nd September to 4th September 2018, 48 hours before the storm makes landfall in Japan. We will observe the time evolution of the minimum sea level pressure and the maximum 10m-wind speed. Snapshots of the slp, 10m wind speed, 2m-temperature, and total precipitation at selected times will be studied to see how the cyclone responds. The differences from the control experiment will be studied to understand the impact the cooling sources will have on the typhoon. We will also look at cross-sectional profiles of the temperature field to understand how the cold pools affect the typhoon such as changes in the eyewall structure and the location of the high wind field. We will also examine the changes in the moisture content. After assessing the results, we will decide how effective this method of artificially reducing the intensity of the typhoon is and if we can replicate it in the real world.
This research was supported by JST Moonshot R&D Grant Number JPMJMS2282.
The typhoon that we will study is Typhoon Jebi and the model will run from 2nd September to 4th September 2018, 48 hours before the storm makes landfall in Japan. We will observe the time evolution of the minimum sea level pressure and the maximum 10m-wind speed. Snapshots of the slp, 10m wind speed, 2m-temperature, and total precipitation at selected times will be studied to see how the cyclone responds. The differences from the control experiment will be studied to understand the impact the cooling sources will have on the typhoon. We will also look at cross-sectional profiles of the temperature field to understand how the cold pools affect the typhoon such as changes in the eyewall structure and the location of the high wind field. We will also examine the changes in the moisture content. After assessing the results, we will decide how effective this method of artificially reducing the intensity of the typhoon is and if we can replicate it in the real world.
This research was supported by JST Moonshot R&D Grant Number JPMJMS2282.