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Title: Substantial convection and precipitation enhancements by ultrafine aerosol particles

Journal Article · · Science
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Aerosol-cloud interaction remains the largest uncertainty in climate projections. Ultrafine aerosol particles (UAP; size <50nm) are considered too small to serve as cloud condensation nuclei conventionally. However, this study provides observational evidence to accompany insights from numerical simulations to support that deep convective clouds (DCCs) over Amazon have strong capability of nucleating UAP from an urban source and forming greater numbers of droplets, because fast drop coalescence in these DCCs reduces drop surface area available for condensation, leading to high vapor supersaturation. The additional droplets subsequently decrease supersaturation and release more condensational latent heating, a dominant contributor to convection intensification, whereas enhanced latent heat from ice-related processes plays a secondary role. Therefore, the addition of anthropogenic UAP may play a much greater role in modulating clouds than previously believed over the Amazon region and possibly in other relatively pristine regions such as maritime and forest locations.

Research Organization:
Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
Sponsoring Organization:
USDOE
DOE Contract Number:
AC05-76RL01830
OSTI ID:
1427899
Report Number(s):
PNNL-SA-126490; KP1701000
Journal Information:
Science, Vol. 359, Issue 6374; ISSN 0036-8075
Publisher:
AAAS
Country of Publication:
United States
Language:
English

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Method to retrieve cloud condensation nuclei number concentrations using lidar measurements journal January 2019
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The Impact of Cloud Processing on the Ice Nucleation Abilities of Soot Particles at Cirrus Temperatures text January 2020
The Green Ocean: precipitation insights from the GoAmazon2014/5 experiment journal January 2018

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