Continued development of a cloud droplet formation parameterization for global climate models

Christos Fountoukis, Athanasios Nenes

Research output: Contribution to journalArticle

159 Citations (Scopus)

Abstract

This study presents continued development of the Nenes and Seinfeld (2003) cloud droplet activation parameterization. First, we expanded the formulation to (1) allow for a lognormal representation of aerosol size distribution, and (2) include a size-dependant mass transfer coefficient for the growth of water droplets to accommodate the effect of size (and potentially organic films) on the droplet growth rate. The performance of the new scheme is evaluated by comparing the parameterized cloud droplet number concentration with that of a detailed numerical activation cloud parcel model. The resulting modified parameterization robustly and closely tracks the parcel model simulations, even for low values of the accommodation coefficient (average error 4.1 ± 1.3%). The modifications to include the effect of accommodation coefficient do not increase the computational cost but substantially improve the parameterization performance. This work offers a robust, computationally efficient and first-principles approach for directly linking complex chemical effects (e.g., surface tension depression, changes in water vapor accommodation, solute contribution from partial solubility) on aerosol activation within a global climate modeling framework.

Original languageEnglish
Pages (from-to)1-10
Number of pages10
JournalJournal of Geophysical Research D: Atmospheres
Volume110
Issue number11
DOIs
Publication statusPublished - 16 Jun 2005
Externally publishedYes

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Climate models
climate models
cloud droplet
Parameterization
parameterization
accommodation coefficient
global climate
climate modeling
activation
droplet
Chemical activation
aerosols
Aerosols
chemical effects
accommodation
surface tension
mass transfer
climate
water vapor
solute

ASJC Scopus subject areas

  • Earth and Planetary Sciences (miscellaneous)
  • Atmospheric Science
  • Geochemistry and Petrology
  • Geophysics
  • Oceanography
  • Space and Planetary Science
  • Astronomy and Astrophysics

Cite this

Continued development of a cloud droplet formation parameterization for global climate models. / Fountoukis, Christos; Nenes, Athanasios.

In: Journal of Geophysical Research D: Atmospheres, Vol. 110, No. 11, 16.06.2005, p. 1-10.

Research output: Contribution to journalArticle

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