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논문 기본 정보
- 자료유형
- 학술저널
- 저자정보
- 발행연도
- 2000.2
- 수록면
- 51 - 64 (14page)
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초록· 키워드
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A mechanism for convective cell regeneration in multicell-type storm is proposed by analysing results obtained from a cloud-resolving model simulation. The simulated storm shows characteristics of mesoscale circulation around the multicell-type storm such as midlatitude squall lines and transient features associated with the consecutive cell regeneration appear. The dominant periods of cell regeneration are 24.38 min and 73.14 min. The period of 73.14 min is related to that of precipitation occurring at the head of gust front. It is shown that strong perturbations in convective cells are confined in a very narrow area compared with a scale of entire multicell-type storm, and experience rapid changes.
Nonlinearity of flow in the area of rapid time change is strong and is closely related to the convective cell regeneration. There always exists a positive advection of vertical velocity behind the convective cell so that the rearward propagation of convective cell can be expected. Thus, the evolution of convective cell might be detected better by nonlinear advective process rather than by buoyancy acceleration process as suggested in previous studies. There exists a clear phase relationship between the dynamic pressure perturbation and vertical velocity, while there is no clear relationship between the total pressure perturbation and vertical velocity. This is because the dynamic pressure calculated using wind perturbation is also confined in the narrow region of highly nonlinear flow. This study suggests that nonlinear advective process can be an alternative mechanism for the regeneration and propagation of convective cells in multicell-type convective storm. This is consistent with the result of a simple dynamical model by Baik and Chun (1996), which shows the periodic regeneration of vertical velocity in highly nonlinear flow regime.
Nonlinearity of flow in the area of rapid time change is strong and is closely related to the convective cell regeneration. There always exists a positive advection of vertical velocity behind the convective cell so that the rearward propagation of convective cell can be expected. Thus, the evolution of convective cell might be detected better by nonlinear advective process rather than by buoyancy acceleration process as suggested in previous studies. There exists a clear phase relationship between the dynamic pressure perturbation and vertical velocity, while there is no clear relationship between the total pressure perturbation and vertical velocity. This is because the dynamic pressure calculated using wind perturbation is also confined in the narrow region of highly nonlinear flow. This study suggests that nonlinear advective process can be an alternative mechanism for the regeneration and propagation of convective cells in multicell-type convective storm. This is consistent with the result of a simple dynamical model by Baik and Chun (1996), which shows the periodic regeneration of vertical velocity in highly nonlinear flow regime.
목차
Abstract
1. 서론
2. 수치 모형 및 실험 설계
3. 결과 및 분석
4. 결론 및 토의
감사의 글
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