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The impact of atmospheric aerosols on precipitation from deep organized convection: A prescribed-flow model study using double-moment bulk microphysics by Joanna Slawinska; Wojciech W. Grabowski; Hugh Morrison is a Earth and Planetary Sciences article available to read on EtoBox.

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## Abstract This note discusses the results of numerical simulations in which a prescribed‐flow model is merged with a double‐moment warm‐rain and ice microphysics scheme to investigate the impact of microphysical processes on precipitation from deep organized convection. The prescribed two‐dimensional flow mimics an idealized squall line, with a narrow region of strong convective updraft and much wider region of weak stratiform updraft overlaying a stratiform downdraft. To cover the broad range of conditions that are possible for a squall line as well as to explore precipitation dependence on different parameters, 25 pairs of simulations are performed. Simulated cases differ in the dynamics (e.g. changing the updraft strength or large‐scale shear), thermodynamics (e.g. changing the inflow sounding) or microphysics (e.g. changing the collision efficiencies). Each pair features cloud condensation nuclei (CCN) in either a pristine or polluted environment. Total surface precipitation and partitioning between convective and stratiform precipitation in each pair appears to be almost the same, with the difference being typically a few tenths of 1%. However, the dynamical and thermodynami

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Author

Joanna Slawinska; Wojciech W. Grabowski; Hugh Morrison

Publisher

John Wiley and Sons; Wiley (John Wiley & Sons); Wiley-Blackwell; Wiley (ISSN 0035-9009)

Published

2009

Language

EN

Field

Earth and Planetary Sciences (Physical Sciences)