열대저기압의 발달 및 소멸 과정에서의 각운동량 분석

Abstract

This study analyzed ideal tropical cyclone using Weather Research and Forecast (WRF) version 3.4.1 through angular momentum. Inflow and outflow of angular momentum were investigated in tropical cyclone system that includes secondary circulation, relation about development and Decay of tropical cyclone was analyzed. Also, influence of angular momentum was found out in comparison kinetic energy. Boundary condition of numerical model was open boundary condition to prevent occurrence of gravity wave during the simulation. Center of tropical cyclone was located at degrees northern latitude, f-plane was 15 °N in order to prevent movement of tropical cyclone. Also, sea surface temperature reduced 26.5 ℃ to 22 ℃ for the simulation of decaying ideal tropical cyclone. Following the tropical cyclone was developing, air parcel was raised because of emitted latent heat while the vapor that raised from lower layer to upper layer was condensed. And, raised air parcel was leaked from center of tropical cyclone because it don’t pass the stratosphere. At that time, angular momentum was lost. In order to replenish air parcel and angular momentum, lower layer was more entered them to center of tropical cyclone. In Decaying tropical cyclone case, latent heating was disappeared while it was reduced in near the center of tropical cyclone. Also, vertical wind was reduced because of interruption in the supply of energy, and rise of air parcel was finally reduced. As a result, loss of angular momentum was reduced because air parcel don’t more diverge, convergence was also reduced.