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Contrasting aerosol refractive index and hygroscopicity in the inflow and outflow of deep convective storms: Analysis of airborne data from DC3
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Sorooshian_et_al-2017-Journal_ ...
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Author
Sorooshian, ArminShingler, 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.
Affiliation
Univ Arizona, Dept Chem & Environm EngnUniv Arizona, Dept Hydrol & Atmospher Sci
Issue Date
2017-04-27
Metadata
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AMER GEOPHYSICAL UNIONCitation
Contrasting aerosol refractive index and hygroscopicity in the inflow and outflow of deep convective storms: Analysis of airborne data from DC3 2017, 122 (8):4565 Journal of Geophysical Research: AtmospheresRights
© 2017. American Geophysical Union. All Rights Reserved.Collection Information
This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.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 parameter) in one of the three storms examined. Two of three control flights with no storm convection reveal higher values, albeit by only 0.02, at high altitude (> 8km) versus < 4km. Entrainment modeling shows that measured values in the outflow of the three storm flights are higher than predicted values (by 0.03-0.11) based on knowledge of 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 (< 4km) to 1.49-1.50 (> 8km). 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.Note
6 month embargo; First published: 27 April 2017ISSN
2169897XVersion
Final published versionSponsors
NASA [NNX12AC1OG, NNX14AP75G, NNX12AC03G, NNX15AT96G]; NASA Earth and Space Science Fellowship [NNX14AK79H]; ONR [N00014-10-1-0811, N00014-16-1-2567]; National Science Foundation [AGS-1522910]; National Science FoundationAdditional Links
http://doi.wiley.com/10.1002/2017JD026638ae974a485f413a2113503eed53cd6c53
10.1002/2017JD026638