Journal cover Journal topic
Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
Atmos. Chem. Phys., 15, 7085-7102, 2015
https://doi.org/10.5194/acp-15-7085-2015
© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.
Research article
30 Jun 2015
In situ vertical profiles of aerosol extinction, mass, and composition over the southeast United States during SENEX and SEAC4RS: observations of a modest aerosol enhancement aloft
N. L. Wagner1,2, C. A. Brock1, W. M. Angevine1,2, A. Beyersdorf3, P. Campuzano-Jost2,4, D. Day2,4, J. A. de Gouw1,2, G. S. Diskin3, T. D. Gordon1,2, M. G. Graus1,2,a, J. S. Holloway1,2, G. Huey5, J. L. Jimenez2,4, D. A. Lack1,2, J. Liao1,2, X. Liu5, M. Z. Markovic1,2,b, A. M. Middlebrook1, T. Mikoviny6, J. Peischl1,2, A. E. Perring1,2, M. S. Richardson1,2, T. B. Ryerson1, J. P. Schwarz1,2, C. Warneke1,2, A. Welti1,2,7, A. Wisthaler8, L. D. Ziemba3, and D. M. Murphy1 1NOAA Earth System Research Laboratory, 325 Broadway, Boulder, CO 80305, USA
2Cooperative Institute for Research in Environmental Sciences, University of Colorado, Boulder, CO 80309, USA
3NASA Langley Research Center, MS 483, Hampton, VA 23681, USA
4Department of Chemistry and Biochemistry, University of Colorado, Boulder, CO 80309, USA
5School of Earth {&} Atmospheric Sciences, Georgia Institute of Technology, Atlanta, GA 30332, USA
6Oak Ridge Associated Universities (ORAU), Oak Ridge, TN, USA
7Institute for Atmospheric & Climate Science, Swiss Federal Institute of Technology, Zürich, Switzerland
8Institute for Ion Physics and Applied Physics, University of Innsbruck, Technikerstrasse 25, 6020 Innsbruck, Austria
anow at: Institute of Meteorology and Geophysics, University of Innsbruck, Austria
bnow at: Air Quality Research Division, Environment Canada, Toronto, ON, Canada
Abstract. Vertical profiles of submicron aerosol from in situ aircraft-based measurements were used to construct aggregate profiles of chemical, microphysical, and optical properties. These vertical profiles were collected over the southeastern United States (SEUS) during the summer of 2013 as part of two separate field studies: the Southeast Nexus (SENEX) study and the Study of Emissions and Atmospheric Composition, Clouds, and Climate Coupling by Regional Surveys (SEAC4RS). Shallow cumulus convection was observed during many profiles. These conditions enhance vertical transport of trace gases and aerosol and create a cloudy transition layer on top of the sub-cloud mixed layer. The trace gas and aerosol concentrations in the transition layer were modeled as a mixture with contributions from the mixed layer below and the free troposphere above. The amount of vertical mixing, or entrainment of air from the free troposphere, was quantified using the observed mixing ratio of carbon monoxide (CO). Although the median aerosol mass, extinction, and volume decreased with altitude in the transition layer, they were ~10 % larger than expected from vertical mixing alone. This enhancement was likely due to secondary aerosol formation in the transition layer. Although the transition layer enhancements of the particulate sulfate and organic aerosol (OA) were both similar in magnitude, only the enhancement of sulfate was statistically significant. The column integrated extinction, or aerosol optical depth (AOD), was calculated for each individual profile, and the transition layer enhancement of extinction typically contributed less than 10 % to the total AOD. Our measurements and analysis were motivated by two recent studies that have hypothesized an enhanced layer of secondary aerosol aloft to explain the summertime enhancement of AOD (2–3 times greater than winter) over the southeastern United States. The first study attributes the layer aloft to secondary organic aerosol (SOA) while the second study speculates that the layer aloft could be SOA or secondary particulate sulfate. In contrast to these hypotheses, the modest enhancement we observed in the transition layer was not dominated by OA and was not a large fraction of the summertime AOD.
Please read the corrigendum first before accessing the article.


Citation: Wagner, N. L., Brock, C. A., Angevine, W. M., Beyersdorf, A., Campuzano-Jost, P., Day, D., de Gouw, J. A., Diskin, G. S., Gordon, T. D., Graus, M. G., Holloway, J. S., Huey, G., Jimenez, J. L., Lack, D. A., Liao, J., Liu, X., Markovic, M. Z., Middlebrook, A. M., Mikoviny, T., Peischl, J., Perring, A. E., Richardson, M. S., Ryerson, T. B., Schwarz, J. P., Warneke, C., Welti, A., Wisthaler, A., Ziemba, L. D., and Murphy, D. M.: In situ vertical profiles of aerosol extinction, mass, and composition over the southeast United States during SENEX and SEAC4RS: observations of a modest aerosol enhancement aloft, Atmos. Chem. Phys., 15, 7085-7102, https://doi.org/10.5194/acp-15-7085-2015, 2015.
Publications Copernicus
Download
Short summary
This paper investigates the summertime vertical profile of aerosol over the southeastern US using in situ measurements collected from aircraft. We use a vertical mixing model and measurements of CO to predict the vertical profile of aerosol that we would expect from vertical mixing alone and compare with the observed aerosol profile. We found a modest enhancement of aerosol in the cloudy transition layer during shallow cumulus convection and attribute the enhancement to local aerosol formation.
This paper investigates the summertime vertical profile of aerosol over the southeastern US...
Share