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Title: Substantial convection and precipitation enhancements by ultrafine aerosol particles

Abstract

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.

Authors:
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Publication Date:
Research Org.:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1427899
Report Number(s):
PNNL-SA-126490
Journal ID: ISSN 0036-8075; KP1701000
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Journal Article
Journal Name:
Science
Additional Journal Information:
Journal Volume: 359; Journal Issue: 6374; Journal ID: ISSN 0036-8075
Publisher:
AAAS
Country of Publication:
United States
Language:
English

Citation Formats

Fan, Jiwen, Rosenfeld, Daniel, Zhang, Yuwei, Giangrande, Scott E., Li, Zhanqing, Machado, Luiz A. T., Martin, Scot T., Yang, Yan, Wang, Jian, Artaxo, Paulo, Barbosa, Henrique M. J., Braga, Ramon C., Comstock, Jennifer M., Feng, Zhe, Gao, Wenhua, Gomes, Helber B., Mei, Fan, Pöhlker, Christopher, Pöhlker, Mira L., Pöschl, Ulrich, and de Souza, Rodrigo A. F.. Substantial convection and precipitation enhancements by ultrafine aerosol particles. United States: N. p., 2018. Web. doi:10.1126/science.aan8461.
Fan, Jiwen, Rosenfeld, Daniel, Zhang, Yuwei, Giangrande, Scott E., Li, Zhanqing, Machado, Luiz A. T., Martin, Scot T., Yang, Yan, Wang, Jian, Artaxo, Paulo, Barbosa, Henrique M. J., Braga, Ramon C., Comstock, Jennifer M., Feng, Zhe, Gao, Wenhua, Gomes, Helber B., Mei, Fan, Pöhlker, Christopher, Pöhlker, Mira L., Pöschl, Ulrich, & de Souza, Rodrigo A. F.. Substantial convection and precipitation enhancements by ultrafine aerosol particles. United States. https://doi.org/10.1126/science.aan8461
Fan, Jiwen, Rosenfeld, Daniel, Zhang, Yuwei, Giangrande, Scott E., Li, Zhanqing, Machado, Luiz A. T., Martin, Scot T., Yang, Yan, Wang, Jian, Artaxo, Paulo, Barbosa, Henrique M. J., Braga, Ramon C., Comstock, Jennifer M., Feng, Zhe, Gao, Wenhua, Gomes, Helber B., Mei, Fan, Pöhlker, Christopher, Pöhlker, Mira L., Pöschl, Ulrich, and de Souza, Rodrigo A. F.. Thu . "Substantial convection and precipitation enhancements by ultrafine aerosol particles". United States. https://doi.org/10.1126/science.aan8461.
@article{osti_1427899,
title = {Substantial convection and precipitation enhancements by ultrafine aerosol particles},
author = {Fan, Jiwen and Rosenfeld, Daniel and Zhang, Yuwei and Giangrande, Scott E. and Li, Zhanqing and Machado, Luiz A. T. and Martin, Scot T. and Yang, Yan and Wang, Jian and Artaxo, Paulo and Barbosa, Henrique M. J. and Braga, Ramon C. and Comstock, Jennifer M. and Feng, Zhe and Gao, Wenhua and Gomes, Helber B. and Mei, Fan and Pöhlker, Christopher and Pöhlker, Mira L. and Pöschl, Ulrich and de Souza, Rodrigo A. F.},
abstractNote = {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.},
doi = {10.1126/science.aan8461},
url = {https://www.osti.gov/biblio/1427899}, journal = {Science},
issn = {0036-8075},
number = 6374,
volume = 359,
place = {United States},
year = {2018},
month = {1}
}

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    Works referencing / citing this record:

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