Calculation of supersaturation maximum and droplet concentration at cloud boundaries

Pinsky, Mark; Khain, Alexander

doi:10.1016/j.atmosres.2019.104694

Calculation of supersaturation maximum and droplet concentration at cloud boundaries

Journal Article · Thu Oct 31 00:00:00 EDT 2019 · Atmospheric Research

DOI:https://doi.org/10.1016/j.atmosres.2019.104694· OSTI ID:1802600

Pinsky, Mark ^[1]; Khain, Alexander ^[2]

Hebrew Univ. of Jerusalem (Israel); OSTI
Hebrew Univ. of Jerusalem (Israel)

Most parameterizations of droplet concentration at cloud base in cloud models are derived under the assumption that all droplets at the cloud base form by nucleation of dry CCN crossing the lifting condensation level in updraft. In this study, a novel method of calculation of the supersaturation maximum and droplet concentration at cloud base is described that takes into account the existence of liquid at the level of droplet nucleation. Liquid exists in haze particles, as well as in the form of cloud droplets and raindrops. It is shown that the presence of liquid water inside non-activated CCN, as well as of cloud droplets and raindrops substantially decreases supersaturation maximum in case of high aerosol concentration. The possible effect of the supersaturation maximum decrease on formation of DSD in clouds is discussed. The method can be also applied to calculation of supersaturation and droplet nucleation at cloud edges.

View Accepted Manuscript (DOE)

Research Organization:: Univ. of Oklahoma, Norman, OK (United States)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC), Biological and Environmental Research (BER)

Grant/Contract Number:: SC0014295

OSTI ID:: 1802600

Alternate ID(s):: OSTI ID: 1691753

Journal Information:: Atmospheric Research, Journal Name: Atmospheric Research Vol. 234; ISSN 0169-8095

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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