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.
| Identifer | oai:union.ndltd.org:arizona.edu/oai:arizona.openrepository.com:10150/624344 |
| Date | 27 April 2017 |
| Creators | 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. |
| Contributors | Univ Arizona, Dept Chem & Environm Engn, Univ Arizona, Dept Hydrol & Atmospher Sci, Department of Chemical and Environmental Engineering; University of Arizona; Tucson Arizona USA, Chemistry and Dynamics Branch; National Aeronautics and Space Administration Langley Research Center; Hampton Virginia USA, Chemistry and Dynamics Branch; National Aeronautics and Space Administration Langley Research Center; Hampton Virginia USA, National Center for Atmospheric Research; Boulder Colorado USA, School of Meteorology; University of Oklahoma; Norman Oklahoma USA, Cooperative Institute for Research in Environmental Sciences and Department of Chemistry and Biochemistry; University of Colorado Boulder; Boulder Colorado USA, Cooperative Institute for Research in Environmental Sciences and Department of Chemistry and Biochemistry; University of Colorado Boulder; Boulder Colorado USA, Cooperative Institute for Research in Environmental Sciences and Department of Chemistry and Biochemistry; University of Colorado Boulder; Boulder Colorado USA, Chemistry and Dynamics Branch; National Aeronautics and Space Administration Langley Research Center; Hampton Virginia USA, Chemistry and Dynamics Branch; National Aeronautics and Space Administration Langley Research Center; Hampton Virginia USA, Department of Chemistry; University of California; Irvine California USA, Institute of Arctic and Alpine Research; University of Colorado Boulder; Boulder Colorado USA |
| Publisher | AMER GEOPHYSICAL UNION |
| Source Sets | University of Arizona |
| Language | English |
| Detected Language | English |
| Type | Article |
| Rights | ©2017. American Geophysical Union. All Rights Reserved. |
| Relation | http://doi.wiley.com/10.1002/2017JD026638 |
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