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Saltzman, Barry; TANG, CHUNG-MUH (2011)
Publisher: Co-Action Publishing
Journal: Tellus A
Languages: English
Types: Article

Classified by OpenAIRE into

arxiv: Physics::Atmospheric and Oceanic Physics
The redistribution of a low-level, passive constituent of the atmosphere under the influence of a growing baroclinic wave is examined by a series of analytical calculations based on a two-level, highly truncated model. It is shown that a constituent confined to the lower half of the atmosphere, and initially homogeneous in the horizontal, will tend to achieve maximum concentration in the low pressure/warm sector portion of the wave and minimum concentration in the high pressure/cold outbreak region with sharpest gradient between the maxima and minima roughly coinciding with the cold front. This distribution is further accentuated if an initial meridional gradient of the constituent exists. If we assume, as a rough first approximation, that water vapor can be considered to be such a passive constituent, it is shown that the implied relative humidity field and cloud distribution will tend to evolve into the comma-type form commonly observed on satellite images of mid-latitude cyclone waves. Moreover, the solution is shown to replicate the complex flow regime associated with the comma formation, elucidating the dynamical rĂ´les of vertical motion and advection in the cloud evolution.DOI: 10.1111/j.1600-0870.1985.tb00269.x
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    • Saltzman, B. and Tang, C.-M. 1972. Analytical study of the evolution of an amplifying baroclinic wave. J. Atmos. Sci. 29,427-444.
    • Saltzman, B. and Tang, C.-M. 1975. Analytical study of the evolution of an amplifying baroclinic wave: Part 11. Vertical motions and transport properties. J . Atmos. Sci. 32,243-259.
    • Saltzman, B. and Tang, C.-M. 1982. A review of some analytical studies of finite-amplitude baroclinic waves, including a new algorithm for the saturation effects of static stability and baroclinicity variations. J. Meteorol. Soc. Japan 60, 1-14.
    • Smagorinsky, J. 1960. On the dynamical prediction of large-scale condensation by numerical methods. Geophys. Monogr. 5, Am. Geophys. Union, 71- 78.
    • Vallis, G. K. 1982. A statistical-dynamical climate model with a simple hydrology cycle. Tellus 34, 21 1-227.
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