지원사업
학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
커뮤니티
연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
초록· 키워드
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The angular momentum transport of an idealized axisymmetric vortex in the developing stage was investigated using the Weather Research and Forecast (WRF) model. The balanced axisymmetric vortex was constructed based on an empirical function for tangential wind, and the temperature, geopotential, and surface pressure were obtained from the balanced equation. The numerical simulation was carried out for 6 days on the f-plane with the Sea Surface Temperature (SST) set as constant. The weak vortex at initial time was intensified with time, and reached the strength of tropical cyclone in a couple of days. The Absolute Angular Momentum (AAM) was transported along with the secondary circulation of the vortex. Total AAM integrated over a cylinder of radius of 2000 km decreased with simulation time, but total kinetic energy increased rapidly. From the budget analysis, it was found that the surface friction is mainly responsible for the decrease of total AAM. Also, contribution of the surface friction to the AAM loss was about 90% while that of horizontal advection was as small as 8%. The trajectory of neutral numerical tracers following the secondary circulation was presented for the Lagrangian viewpoint of the transports of absolute angular momentum. From the analysis using the trajectory of tracers it was found that the air parcel was under the influence of the surface friction continuously until it leaves the boundary layer near the core. Then the air parcel with reduced amount of angular momentum compared to its original amount was transported from boundary layer to upper level of the vortex and contributed to form the anti-cyclone. These results suggest that the tropical cyclone loses angular momentum as it develops, which is due to the dissipation of angular momentum by the surface friction.
목차
Abstract
1. 서론
2. 연구방법
3. 열대저기압의 발달과 각운동량 수송
4. 절대각운동량의 수지
5. 요약 및 결론
참고문헌
참고문헌 (26)
참고문헌 신청
1. [학술지(정기간행물)] - Anthes, R. A / 1974 / The dynamics and energetic of mature tropical cyclones / Rev. Geophys 12 : 495 ~ 522
2. [학술지(정기간행물)] - Chan, J. C. L / 1987 / Analytical and numerical studies of the beta-effect in tropical cyclone motion. Part I: Zero mean flow / J. Atmos. Sci 44 : 1257 ~ 1265
3. [학술지(정기간행물)] - Downey, W. K. / 1977 / The mass, absolute angular momentum and kinetic energy budgets of model-generated extratropical cyclones and anticyclones / Mon. Wea. Rev 106 : 469 ~ 481
4. [학술지(정기간행물)] - Eliassen, A / 1951 / Slow thermally or frictionally controlled meridional circulation in a circular vortex / Astrophys. Norv 5 : 19 ~ 60
5. [학술지(정기간행물)] - Emanuel, K. A. / 1986 / An air–sea interaction theory for tropical cyclones. Part I: Steady-state maintenance / J. Atmos. Sci 43 : 585 ~ 604
2. [학술지(정기간행물)] - Chan, J. C. L / 1987 / Analytical and numerical studies of the beta-effect in tropical cyclone motion. Part I: Zero mean flow / J. Atmos. Sci 44 : 1257 ~ 1265
3. [학술지(정기간행물)] - Downey, W. K. / 1977 / The mass, absolute angular momentum and kinetic energy budgets of model-generated extratropical cyclones and anticyclones / Mon. Wea. Rev 106 : 469 ~ 481
4. [학술지(정기간행물)] - Eliassen, A / 1951 / Slow thermally or frictionally controlled meridional circulation in a circular vortex / Astrophys. Norv 5 : 19 ~ 60
5. [학술지(정기간행물)] - Emanuel, K. A. / 1986 / An air–sea interaction theory for tropical cyclones. Part I: Steady-state maintenance / J. Atmos. Sci 43 : 585 ~ 604
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UCI(KEPA) : I410-ECN-0101-2014-450-003134931