Relationships between giant sea salt particles and clouds inferred from aircraft physicochemical data

Hossein Dadashazar, Zhen Wang, Ewan Crosbie, Michael Brunke, Xubin Zeng, Haflidi Jonsson, Roy K. Woods, Richard C. Flagan, John H. Seinfeld, Armin Sorooshian

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

This study uses airborne data from multiple field campaigns off the California coast to determine the extent to which a size distribution parameter and a cloud water chemical measurement can capture the effect of giant cloud condensation nuclei (GCCN), specifically sea salt, on marine stratocumulus cloud properties. The two GCCN proxy variables, near-surface particle number concentration for diameters >5 µm and cloud water chloride concentration, are significantly correlated (95% confidence) with each other, and both exhibit expected relationships with other parameters (e.g., surface wind) that typically coincide with sea salt emissions. Factors influencing the relationship between these two GCCN proxy measurements include precipitation rate (R) and the standard deviation of the subcloud vertical velocity owing likely to scavenging effects and improved mixing/transport of sea salt to cloud base, respectively. When comparing 12 pairs of high and low chloride cloud cases (at fixed liquid water path and cloud drop number concentration), the average drop spectra for high chloride cases exhibit enhanced drop number at diameters exceeding 20 µm, especially above 30 µm. In addition, high chloride cases coincide with enhanced mean columnar R and negative values of precipitation susceptibility. The difference in drop effective radius between high and low chloride conditions decreases with height in cloud, suggesting that some GCCN-produced raindrops precipitate before reaching cloud tops. The sign of cloud responses (i.e., R) to perturbations in giant sea salt particle concentration, as evaluated from Modern Era Retrospective Analysis for Research and Applications version 2 reanalysis data, is consistent with the aircraft data.

Original languageEnglish (US)
Pages (from-to)3421-3434
Number of pages14
JournalJournal of Geophysical Research: Atmospheres
Volume122
Issue number6
DOIs
StatePublished - Mar 27 2017

Fingerprint

aircraft
sea salt
chlorides
Salts
Aircraft
salts
cloud condensation nucleus
chloride
condensation nuclei
Chlorides
cloud water
sea transportation
Condensation
water
stratocumulus
raindrop
particle
surface wind
Water
stratocumulus clouds

Keywords

  • chloride
  • cloud
  • GCCN
  • MERRA
  • precipitation
  • sea salt

ASJC Scopus subject areas

  • Geophysics
  • Oceanography
  • Forestry
  • Ecology
  • Aquatic Science
  • Water Science and Technology
  • Soil Science
  • Geochemistry and Petrology
  • Earth-Surface Processes
  • Atmospheric Science
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science
  • Palaeontology

Cite this

Relationships between giant sea salt particles and clouds inferred from aircraft physicochemical data. / Dadashazar, Hossein; Wang, Zhen; Crosbie, Ewan; Brunke, Michael; Zeng, Xubin; Jonsson, Haflidi; Woods, Roy K.; Flagan, Richard C.; Seinfeld, John H.; Sorooshian, Armin.

In: Journal of Geophysical Research: Atmospheres, Vol. 122, No. 6, 27.03.2017, p. 3421-3434.

Research output: Contribution to journalArticle

Dadashazar, H, Wang, Z, Crosbie, E, Brunke, M, Zeng, X, Jonsson, H, Woods, RK, Flagan, RC, Seinfeld, JH & Sorooshian, A 2017, 'Relationships between giant sea salt particles and clouds inferred from aircraft physicochemical data', Journal of Geophysical Research: Atmospheres, vol. 122, no. 6, pp. 3421-3434. https://doi.org/10.1002/2016JD026019
Dadashazar, Hossein ; Wang, Zhen ; Crosbie, Ewan ; Brunke, Michael ; Zeng, Xubin ; Jonsson, Haflidi ; Woods, Roy K. ; Flagan, Richard C. ; Seinfeld, John H. ; Sorooshian, Armin. / Relationships between giant sea salt particles and clouds inferred from aircraft physicochemical data. In: Journal of Geophysical Research: Atmospheres. 2017 ; Vol. 122, No. 6. pp. 3421-3434.
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