Aerosol effect on the mobility of cloud droplets

Ilan Koren; Orit Altaratz; Guy Dagan

doi:https://doi.org/10.1088/1748-9326/10/10/104011

Aerosol effect on the mobility of cloud droplets

Ilan Koren, Orit Altaratz, Guy Dagan

Department of Earth and Planetary Sciences

Weizmann Institute of Science

Research output: Contribution to journal › Article › peer-review

Abstract

Cloud droplet mobility is referred to here as a measure of the droplets' ability to move with ambient air. We claim that an important part of the aerosol effect on convective clouds is driven by changes in droplet mobility. We show that the mass-weighted average droplet terminal velocity, defined here as the 'effective terminal velocity' (η) and its spread (σ_η) serve as direct measures of this effect. Moreover, we develop analytical estimations for η and to show that changes in the relative dispersion of η (ϵ_η = σ_η/η) can serve as a sensitive predictor of the onset of droplet-collection processes.

Original language	English
Article number	104011
Number of pages	10
Journal	Environmental Research Letters
Volume	10
Issue number	10
DOIs	https://doi.org/10.1088/1748-9326/10/10/104011
State	Published - 14 Oct 2015

Keywords

cloud aerosol interactions
cloud invigoration
droplet mobility
terminal velocity

All Science Journal Classification (ASJC) codes

Public Health, Environmental and Occupational Health
General Environmental Science
Renewable Energy, Sustainability and the Environment

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title = "Aerosol effect on the mobility of cloud droplets",

abstract = "Cloud droplet mobility is referred to here as a measure of the droplets' ability to move with ambient air. We claim that an important part of the aerosol effect on convective clouds is driven by changes in droplet mobility. We show that the mass-weighted average droplet terminal velocity, defined here as the 'effective terminal velocity' (η) and its spread (ση) serve as direct measures of this effect. Moreover, we develop analytical estimations for η and to show that changes in the relative dispersion of η (ϵη = ση/η) can serve as a sensitive predictor of the onset of droplet-collection processes.",

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T1 - Aerosol effect on the mobility of cloud droplets

AU - Koren, Ilan

AU - Altaratz, Orit

AU - Dagan, Guy

PY - 2015/10/14

Y1 - 2015/10/14

N2 - Cloud droplet mobility is referred to here as a measure of the droplets' ability to move with ambient air. We claim that an important part of the aerosol effect on convective clouds is driven by changes in droplet mobility. We show that the mass-weighted average droplet terminal velocity, defined here as the 'effective terminal velocity' (η) and its spread (ση) serve as direct measures of this effect. Moreover, we develop analytical estimations for η and to show that changes in the relative dispersion of η (ϵη = ση/η) can serve as a sensitive predictor of the onset of droplet-collection processes.

AB - Cloud droplet mobility is referred to here as a measure of the droplets' ability to move with ambient air. We claim that an important part of the aerosol effect on convective clouds is driven by changes in droplet mobility. We show that the mass-weighted average droplet terminal velocity, defined here as the 'effective terminal velocity' (η) and its spread (ση) serve as direct measures of this effect. Moreover, we develop analytical estimations for η and to show that changes in the relative dispersion of η (ϵη = ση/η) can serve as a sensitive predictor of the onset of droplet-collection processes.

KW - cloud aerosol interactions

KW - cloud invigoration

KW - droplet mobility

KW - terminal velocity

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DO - https://doi.org/10.1088/1748-9326/10/10/104011

M3 - مقالة

SN - 1748-9318

VL - 10

JO - Environmental Research Letters

JF - Environmental Research Letters

IS - 10

M1 - 104011

ER -

Aerosol effect on the mobility of cloud droplets

Abstract

Keywords

All Science Journal Classification (ASJC) codes

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