Aerosol and gas re-distribution by shallow cumulus clouds: An investigation using airborne measurements

Wonaschuetz Anna Wonaschuetz, Armin Sorooshian, Barbara Ervens, Patrick Y. Chuang, Graham Feingold, Shane M. Murphy, Joost De Gouw, Carsten Warneke, Haflidi H. Jonsson

Research output: Contribution to journalArticle

32 Citations (Scopus)

Abstract

Aircraft measurements during the 2006 Gulf of Mexico Atmospheric Composition and Climate Study (GoMACCS) are used to examine the influence of shallow cumulus clouds on vertical profiles of aerosol chemical composition, size distributions, and secondary aerosol precursor gases. The data show signatures of convective transport of particles, gases and moisture from near the surface to higher altitudes, and of aqueous-phase production of aerosol mass (sulfate and organics) in cloud droplets and aerosol water. In cloudy conditions, the average aerosol volume concentration at an altitude of 2850 m, above typical cloud top levels, was found to be 34% of that at 450 m; for clear conditions, the same ratio was 13%. Both organic and sulfate mass fractions were on average constant with altitude (around 50%); however, the ratio of oxalate to organic mass increased with altitude (from 1% at 450 m to almost 9% at 3450 m), indicative of the influence of in-cloud production on the vertical abundance and characteristics of secondary organic aerosol (SOA) mass. A new metric termed "residual cloud fraction" is introduced as a way of quantifying the "cloud processing history" of an air parcel. Results of a parcel model simulating aqueous phase production of sulfate and organics reproduce observed trends and point at a potentially important role of SOA production, especially oligomers, in deliquesced aerosols. The observations emphasize the importance of shallow cumulus clouds in altering the vertical distribution of aerosol properties that influence both their direct and indirect effect on climate.

Original languageEnglish (US)
Article numberD17202
JournalJournal of Geophysical Research: Space Physics
Volume117
Issue number17
DOIs
StatePublished - 2012

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cumulus clouds
cumulus
Aerosols
aerosols
Gases
aerosol
Sulfuric Acid Esters
gases
gas
sulfates
sulfate
climate
Atmospheric composition
aerosol property
atmospheric composition
distribution
airborne survey
cloud droplet
Gulf of Mexico
vertical distribution

ASJC Scopus subject areas

  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science
  • Atmospheric Science
  • Geophysics

Cite this

Aerosol and gas re-distribution by shallow cumulus clouds : An investigation using airborne measurements. / Anna Wonaschuetz, Wonaschuetz; Sorooshian, Armin; Ervens, Barbara; Chuang, Patrick Y.; Feingold, Graham; Murphy, Shane M.; De Gouw, Joost; Warneke, Carsten; Jonsson, Haflidi H.

In: Journal of Geophysical Research: Space Physics, Vol. 117, No. 17, D17202, 2012.

Research output: Contribution to journalArticle

Anna Wonaschuetz, W, Sorooshian, A, Ervens, B, Chuang, PY, Feingold, G, Murphy, SM, De Gouw, J, Warneke, C & Jonsson, HH 2012, 'Aerosol and gas re-distribution by shallow cumulus clouds: An investigation using airborne measurements', Journal of Geophysical Research: Space Physics, vol. 117, no. 17, D17202. https://doi.org/10.1029/2012JD018089
Anna Wonaschuetz, Wonaschuetz ; Sorooshian, Armin ; Ervens, Barbara ; Chuang, Patrick Y. ; Feingold, Graham ; Murphy, Shane M. ; De Gouw, Joost ; Warneke, Carsten ; Jonsson, Haflidi H. / Aerosol and gas re-distribution by shallow cumulus clouds : An investigation using airborne measurements. In: Journal of Geophysical Research: Space Physics. 2012 ; Vol. 117, No. 17.
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