Contrasting aerosol refractive index and hygroscopicity in the inflow and outflow of deep convective storms: Analysis of airborne data from DC3

Armin Sorooshian, T. Shingler, E. Crosbie, M. C. Barth, C. R. Homeyer, P. Campuzano-Jost, D. A. Day, J. L. Jimenez, K. L. Thornhill, L. D. Ziemba, D. R. Blake, A. Fried

Research output: Contribution to journalArticle

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Abstract

We examine three case studies during the Deep Convective Clouds and Chemistry (DC3) field experiment when storm inflow and outflow air were sampled for aerosol subsaturated hygroscopicity and the real part of refractive index (n) with a Differential Aerosol Sizing and Hygroscopicity Probe (DASH-SP) on the NASA DC-8. Relative to inflow aerosol particles, outflow particles were more hygroscopic (by 0.03 based on the estimated κ parameter) in one of the three storms examined. Two of three “control” flights with no storm convection reveal higher κ values, albeit by only 0.02, at high altitude (> 8 km) versus < 4 km. Entrainment modeling shows that measured κ values in the outflow of the three storm flights are higher than predicted values (by 0.03–0.11) based on knowledge of κ values from the inflow and clear air adjacent to the storms. This suggests that other process(es) contributed to hygroscopicity enhancements such as secondary aerosol formation via aqueous-phase chemistry. Values of n were higher in the outflow of two of the three storm flights, reaching as high as 1.54. More statistically significant differences were observed in control flights (no storms) where n decreased from 1.50–1.52 (< 4 km) to 1.49–1.50 (> 8 km). Chemical data show that enhanced hygroscopicity was coincident with lower organic mass fractions, higher sulfate mass fractions, and higher O:C ratios of organic aerosol. Refractive index did not correlate as well with available chemical data. Deep convection is shown to alter aerosol radiative properties, which has implications for aerosol effects on climate.

Original languageEnglish (US)
Pages (from-to)4565-4577
Number of pages13
JournalJournal of Geophysical Research: Atmospheres
Volume122
Issue number8
DOIs
StatePublished - Apr 27 2017

Fingerprint

hygroscopicity
refractive index
aerosols
Aerosols
Refractive index
inflow
outflow
refractivity
aerosol
convection
flight control
convective cloud
sizing
high altitude
Sulfates
climate
NASA
analysis
sulfates
chemistry

Keywords

  • aerosol
  • cloud processing
  • DC3
  • entrainment
  • hygroscopicity
  • refractive index

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

Contrasting aerosol refractive index and hygroscopicity in the inflow and outflow of deep convective storms : Analysis of airborne data from DC3. / Sorooshian, Armin; Shingler, T.; Crosbie, E.; Barth, M. C.; Homeyer, C. R.; Campuzano-Jost, P.; Day, D. A.; Jimenez, J. L.; Thornhill, K. L.; Ziemba, L. D.; Blake, D. R.; Fried, A.

In: Journal of Geophysical Research: Atmospheres, Vol. 122, No. 8, 27.04.2017, p. 4565-4577.

Research output: Contribution to journalArticle

Sorooshian, A, Shingler, T, Crosbie, E, Barth, MC, Homeyer, CR, Campuzano-Jost, P, Day, DA, Jimenez, JL, Thornhill, KL, Ziemba, LD, Blake, DR & Fried, A 2017, 'Contrasting aerosol refractive index and hygroscopicity in the inflow and outflow of deep convective storms: Analysis of airborne data from DC3', Journal of Geophysical Research: Atmospheres, vol. 122, no. 8, pp. 4565-4577. https://doi.org/10.1002/2017JD026638
Sorooshian, Armin ; Shingler, T. ; Crosbie, E. ; Barth, M. C. ; Homeyer, C. R. ; Campuzano-Jost, P. ; Day, D. A. ; Jimenez, J. L. ; Thornhill, K. L. ; Ziemba, L. D. ; Blake, D. R. ; Fried, A. / Contrasting aerosol refractive index and hygroscopicity in the inflow and outflow of deep convective storms : Analysis of airborne data from DC3. In: Journal of Geophysical Research: Atmospheres. 2017 ; Vol. 122, No. 8. pp. 4565-4577.
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abstract = "We examine three case studies during the Deep Convective Clouds and Chemistry (DC3) field experiment when storm inflow and outflow air were sampled for aerosol subsaturated hygroscopicity and the real part of refractive index (n) with a Differential Aerosol Sizing and Hygroscopicity Probe (DASH-SP) on the NASA DC-8. Relative to inflow aerosol particles, outflow particles were more hygroscopic (by 0.03 based on the estimated κ parameter) in one of the three storms examined. Two of three “control” flights with no storm convection reveal higher κ values, albeit by only 0.02, at high altitude (> 8 km) versus < 4 km. Entrainment modeling shows that measured κ values in the outflow of the three storm flights are higher than predicted values (by 0.03–0.11) based on knowledge of κ values from the inflow and clear air adjacent to the storms. This suggests that other process(es) contributed to hygroscopicity enhancements such as secondary aerosol formation via aqueous-phase chemistry. Values of n were higher in the outflow of two of the three storm flights, reaching as high as 1.54. More statistically significant differences were observed in control flights (no storms) where n decreased from 1.50–1.52 (< 4 km) to 1.49–1.50 (> 8 km). Chemical data show that enhanced hygroscopicity was coincident with lower organic mass fractions, higher sulfate mass fractions, and higher O:C ratios of organic aerosol. Refractive index did not correlate as well with available chemical data. Deep convection is shown to alter aerosol radiative properties, which has implications for aerosol effects on climate.",
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AU - Crosbie, E.

AU - Barth, M. C.

AU - Homeyer, C. R.

AU - Campuzano-Jost, P.

AU - Day, D. A.

AU - Jimenez, J. L.

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