Abstract
The momentum equations can be written in a form whereby pressure is replaced by a deviation of pressure from a hydrostatic, horizontally homogeneous base state. This pressure perturbation has both hydrostatic and nonhydrostatic parts owing to density deviations from the horizontally homogeneous base state and three-dimensional wind velocity gradients, respectively. The pressure perturbation also can be decomposed into what are referred to as a dynamic pressure perturbation and a buoyancy pressure perturbation. It is shown that dynamic pressure perturbations arise when deformation or vorticity are present in the velocity field. Buoyancy pressure perturbations arise when vertical buoyancy gradients exist.
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5 Further reading
Das, P., 1979: A non-Archimedian approach to the equations of convection dynamics. J. Atmos. Sci., 36, 2183–2190.
Davies-Jones, R., 2003: An expression for effective buoyancy in surroundings with horizontal density gradients. J. Atmos. Sci., 60, 2922–2925.
Doswell, C. A., and P. M. Markowski, 2004: Is buoyancy a relative quantity? Mon. Wea. Rev., 132, 853–863.
List, R. and E. P. Lozowski, 1970: Pressure perturbations and buoyancy in convective clouds. J. Atmos. Sci., 27, 168–170.
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© 2007 CISM, Udine
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Markowski, P. (2007). Pressure Fluctuations Associated with Deep Moist Convection. In: Giaiotti, D.B., Steinacker, R., Stel, F. (eds) Atmospheric Convection: Research and Operational Forecasting Aspects. CISM International Centre for Mechanical Sciences, vol 475. Springer, Vienna. https://doi.org/10.1007/978-3-211-69291-2_3
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DOI: https://doi.org/10.1007/978-3-211-69291-2_3
Publisher Name: Springer, Vienna
Print ISBN: 978-3-211-48963-5
Online ISBN: 978-3-211-69291-2
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