Journal
ENVIRONMENTAL SCIENCE & TECHNOLOGY
Volume 51, Issue 3, Pages 1348-1356Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.est.6b04487
Keywords
-
Categories
Funding
- National Science Foundation [ATM-0650659, ATM-0625526]
- National Oceanic and Atmospheric Administration, Educational Partnership Program, US Department of Commerce [NA11SEC4810003, NA16SEC4810006]
- USDOTSPTC [DTRT13-G-UTC36]
- University of Michigan College of Literature, Science, and the Arts and Department of Chemistry
Ask authors/readers for more resources
Playas emit large quantities of dust that can facilitate the activation of cloud droplets. Despite the potential importance of playa dusts for cloud formation, most climate models assume that all dust is nonhygroscopic; however, measurements are needed to clarify the role of dusts in aerosol-cloud interactions. Here, we report measurements of CCN activation from playa dusts and parameterize these results in terms of both kappa-Kohler theory and adsorption activation theory for inclusion in atmospheric models. kappa ranged from 0.002 +/- 0.001 to 0.818 +/- 0.094, whereas Frankel-Halsey-Hill (FHH) adsorption parameters of A(FHH) = 2.20 +/- 0.60 and B-FHH = 1.24 +/- 0.14 described the water uptake properties of the dusts. Measurements made using aerosol time-of flight mass spectrometry (ATOFMS) revealed the presence of halite, sodium sulfates, and sodium carbonates that were strongly correlated with kappa underscoring the role that mineralogy, including salts, plays in water uptake by dust. Predictions of kappa made using bulk chemical techniques generally showed good agreement with measured values. However, several samples were poorly predicted suggesting that chemical heterogeneities as a function of size or chemically distinct particle surfaces can determine the hygroscopicity of playa dusts. Our results further demonstrate the importance of dust in aerosol-cloud interactions.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available