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Raindrop Multiplication by Drop Breakup

David B. JohnsonState Water Survey Division, Illinois Department of Energy and Natural Resources, Champaign 61820

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Abstract

The importance of multiple cycles of raindrop growth and breakup in the evolution of warm rain is limited by the time required for breakup fragments to grow back to breakup sizes and, if the updraft is not strong enough to suspend the drops involved, the distance the drops fall during the multiplication cycle. This note introduces analytical solutions that allow quantitative examination of these limits.

Abstract

The importance of multiple cycles of raindrop growth and breakup in the evolution of warm rain is limited by the time required for breakup fragments to grow back to breakup sizes and, if the updraft is not strong enough to suspend the drops involved, the distance the drops fall during the multiplication cycle. This note introduces analytical solutions that allow quantitative examination of these limits.

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