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이 논문의 연구 히스토리 (3)
2013
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초록· 키워드
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Nonhydrostatic effects on convectively forced mesoscale flows in two dimensions are numerically investigated using a nondimensional model. An elevated heating that represents convective heating due to deep cumulus convection is specified in a uniform basic flow with constant stability, and numerical experiments are performed with different values of the nonlinearity factor and nonhydrostaticity factor. The simulation result in a linear system is first compared to the analytic solution. The simulated vertical velocity field is very similar to the analytic one, confirming the high accuracy of nondimensional model’s solutions. When the nonhydrostaticity factor is small, alternating regions of upward and downward motion above the heating top appear. On the other hand, when the nonhydrostaticity factor is relatively large, alternating updraft and downdraft cells appear downwind of the main updraft region. These features according to the nonhydrostaticity factor appear in both linear and nonlinear flow systems. The location of the maximum vertical velocity in the main updraft region differs depending on the degrees of nonlinearity and nonhydrostaticity. Using the Taylor-Goldstein equation in a linear, steady-state, invscid system, it is analyzed that evanescent waves exist for a given nonhydrostaticity factor. The critical wavelength of an evanescent wave is given by λ<SUB>c</SUB> = 2πβ, where β is the nonhydrostaticity factor. Waves whose wavelengths are smaller than the critical wavelength become evanescent. The alternating updraft and downdraft cells are formed by the superposition of evanescent waves and horizontally propagating parts of propagating waves. Simulation results show that the horizontal length of the updraft and downdraft cells is the half of the critical wavelength (πβ) in a linear flow system and larger than πβ in a weakly nonlinear flow system.
목차
Abstract
1. 서론
2. 수치 모형과 실험 설계
3. 결과 및 논의
4. 요약
REFERENCES
참고문헌 (27)
참고문헌 신청
1. [학술지(정기간행물)] - Asselin, R / 1972 / Frequency filter for time integrations / Mon. Wea. Rev 100 : 487 ~ 490
2. [학술지(정기간행물)] - Baik, J.-J / 1996 / Effects of nonlinearity on the atmospheric flow response to low-level heating in a uniform flow / J. Atmos. Sci 53 : 1856 ~ 1869
3. [학술지(정기간행물)] - Betz, V. / 1992 / Comparison and evaluation of boundary conditions for the absorption of guided waves in an FDTD simulation / IEEE Microwave Guided Wave Lett 2 : 499 ~ 501
4. [학술지(정기간행물)] - Chun, H.-Y / 1997 / Weakly non-linear response of a stably stratified shear flow to thermal forcing / Tellus 49A : 528 ~ 543
5. [학술지(정기간행물)] - Chun, H.-Y / 2008 / Effects of nonlinearity on convectively forced internal gravity waves: Application to a gravity wave drag parameterization / J. Atmos. Sci 65 : 557 ~ 575
2. [학술지(정기간행물)] - Baik, J.-J / 1996 / Effects of nonlinearity on the atmospheric flow response to low-level heating in a uniform flow / J. Atmos. Sci 53 : 1856 ~ 1869
3. [학술지(정기간행물)] - Betz, V. / 1992 / Comparison and evaluation of boundary conditions for the absorption of guided waves in an FDTD simulation / IEEE Microwave Guided Wave Lett 2 : 499 ~ 501
4. [학술지(정기간행물)] - Chun, H.-Y / 1997 / Weakly non-linear response of a stably stratified shear flow to thermal forcing / Tellus 49A : 528 ~ 543
5. [학술지(정기간행물)] - Chun, H.-Y / 2008 / Effects of nonlinearity on convectively forced internal gravity waves: Application to a gravity wave drag parameterization / J. Atmos. Sci 65 : 557 ~ 575
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