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Title: Substantial convection and precipitation enhancements by ultrafine aerosol particles

Abstract

Aerosol-cloud interactions remain the largest uncertainty in climate projections. Ultrafine aerosol particles smaller than 50 nanometers (UAP<50) can be abundant in the troposphere, but are conventionally considered too small to affect cloud formation. However, observational evidence and numerical simulations of deep convective clouds (DCCs) over the Amazon show that DCCs forming in a low aerosol environment can develop very large vapor supersaturation because fast droplet coalescence reduces integrated droplet surface area and subsequent condensation. UAP<50 from pollution plumes that are ingested into such clouds can be activated to form additional cloud droplets on which excess supersaturation condenses and forms additional cloud water and latent heating, thus intensifying convective strength. This mechanism suggests a strong anthropogenic invigoration of DCCs in previously pristine regions of the world.

Authors:
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Publication Date:
Research Org.:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Biological and Environmental Research (BER) (SC-23); National Science Foundation (NSF); National Science Foundation of China; European Union (EU); Cloud Processes of the Main Precipitation System (CHUVA) project; National Institute of Amazonian Research (INPA); Amazonas State Univ. (UEA); Amazonas State Research Support Foundation (FAPEAM); National Council for Scientific and Technological Development (CNPq); German Federal Ministry of Education and Research (BMBF)
OSTI Identifier:
1438524
Alternate Identifier(s):
OSTI ID: 1424983
Report Number(s):
BNL-203206-2018-JAAM
Journal ID: ISSN 0036-8075; /sci/359/6374/411.atom
Grant/Contract Number:  
award364292; award317001; AC06-76RLO1830; SC0012704; AC06-76RL01830; AGS1534670; 91544217; 2009/15235-8; 2013/05014-0; 2013/50510-5; 01LB1001A; 01.11.01248.00
Resource Type:
Published Article
Journal Name:
Science
Additional Journal Information:
Journal Name: Science Journal Volume: 359 Journal Issue: 6374; Journal ID: ISSN 0036-8075
Publisher:
American Association for the Advancement of Science (AAAS)
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES

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. 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, and de Souza, Rodrigo A. F. Thu . "Substantial convection and precipitation enhancements by ultrafine aerosol particles". United States. doi:10.1126/science.aan8461.
@article{osti_1438524,
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 interactions remain the largest uncertainty in climate projections. Ultrafine aerosol particles smaller than 50 nanometers (UAP<50) can be abundant in the troposphere, but are conventionally considered too small to affect cloud formation. However, observational evidence and numerical simulations of deep convective clouds (DCCs) over the Amazon show that DCCs forming in a low aerosol environment can develop very large vapor supersaturation because fast droplet coalescence reduces integrated droplet surface area and subsequent condensation. UAP<50 from pollution plumes that are ingested into such clouds can be activated to form additional cloud droplets on which excess supersaturation condenses and forms additional cloud water and latent heating, thus intensifying convective strength. This mechanism suggests a strong anthropogenic invigoration of DCCs in previously pristine regions of the world.},
doi = {10.1126/science.aan8461},
journal = {Science},
number = 6374,
volume = 359,
place = {United States},
year = {2018},
month = {1}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
DOI: 10.1126/science.aan8461

Citation Metrics:
Cited by: 27 works
Citation information provided by
Web of Science

Figures / Tables:

Table 1 Table 1: Model simulations. BG denotes present-day background (BG) aerosol condition in the Manaus region, PI denotes the pre-industrial (PI) aerosol condition, P3 means three times higher Na for plume, and C represents the clean condition (i.e., no plume). L in PL3 represents large aerosol particles (i.e., D > 50more » nm). SD denotes size distribution and VD denotes vertical distribution. The peaked SD means the measured size distribution that has a peak value over a size range. Upper-level peak VD means a measured vertical distribution with aerosols peaked at upper levels. See the details in SM. N/A means no plume is applied (i.e., aerosols are horizontally uniform over the domain at the model initial time).« less

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