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• W2010583635 abstract "The microphysics-dynamics interaction of clouds was theoretically studied in the zone after maximum supersaturation (S−1)mc where the droplet number concentration remains nearly constant. The analytic solution obtained, employing the Maxwellian droplet growth theory, describes (S−1)mc=Iwu34n−12, where I is the proportionality constant, wu the updraft velocity and n the number concentration of the droplets. This solution agrees well with previous studies. Factor I increases with altitude in the adiabatic atmosphere, decreases with temperature under constant pressure and increases with pressure under constant temperature. For the zone sufficiently after (S−1)mc, an approximate relationship (S−1) ∝r−1 ∝t−13 is shown to hold, where (S−1) is the supersaturation, f the average droplet radius and t the time. Using the diffusion-kinetic theory of droplet growth, which includes the effects of thermal accomodation and condensation coefficients, numerically soluble relationships are derived for (S−1), r and t. Application of this theory is shown to increase (S−1)mc considerably. The Maxwellian analytic solution that is obtained, the variation of Factor I under different atmospheric conditions and the effect of condensation and thermal accomoddation coefficients through the use of the diffusion-kinetic droplet growth theory suggest that maximum supersaturation may reach as high as 10% and beyond in convective clouds. On étude théoriquement les interactions entre la microphysique et la dynamique des nuages dans la zone au-delà de la sursaturation maximale (S−1)mc où la concentration en nombre des gouttelettes est pratiquement constante. La solution analytique obtenue, que utilise la théorie de Maxwell de croissance des gouttes, donne (S−1)mc=Iwu34n−12, où I est la constante de proportionnalité, wu la vitesse du courant ascendant et n la concentration en nombre des goutelettes. Cette solution s'accorde bien avec de précédentes études. Le facteur I augmente avec l'altitude dans l'atmosphère adiabatique, diminue avec la température sous pression constante, et augmente avec la pression sous température constante. Dans la zone suffisamment au-delà de (S−1)mc, on trouve une relation approchée (S−1) ∝r−1 ∝t−13, où (S−1) est la sursaturation, r le rayon moyen des gouttelettes, et t le temps. En utilisant la théorie cinétique de croissance des gouttelettes, qui prend en compte les effets de l'accommodation thermique et des coefficients de condensation, on établie des relations pouvant se résoudre numériquement pour (S−1), r et t. L'applciation de cette théorie montre une augmentation considérable de (S−1)mc. La solution analytique de Maxwell obtenue, la variation du facteur I sous différentes conditions atmosphériques, et l'effet des coefficients de condensation et d'accomodation thermique par le biais de l'utilisation de la théorie cinétique de croissance des gouttelettes, suggèrent que la sursaturation maximale peut atteindre et même dépasser 10% dans les nuages convectifs." @default.
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• W2010583635 date "1993-09-01" @default.
• W2010583635 modified "2023-10-02" @default.
• W2010583635 title "Water supersaturation in convective clouds" @default.
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• W2010583635 doi "https://doi.org/10.1016/0169-8095(93)90043-n" @default.
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