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Title: Assessing the Effects of Anthropogenic Aerosols on Pacific Storm Track Using a Multiscale Global Climate Model

Abstract

Atmospheric aerosols impact weather and global general circulation by modifying cloud and precipitation processes, but the magnitude of cloud adjustment by aerosols remains poorly quantified and represents the largest uncertainty in estimated forcing of climate change. Here we assess the impacts of anthropogenic aerosols on the Pacific storm track using a multi-scale global aerosol-climate model (GCM). Simulations of two aerosol scenarios corresponding to the present day and pre-industrial conditions reveal long-range transport of anthropogenic aerosols across the north Pacific and large resulting changes in the aerosol optical depth, cloud droplet number concentration, and cloud and ice water paths. Shortwave and longwave cloud radiative forcing at the top of atmosphere are changed by - 2.5 and + 1.3 W m-2, respectively, by emission changes from pre-industrial to present day, and an increased cloud-top height indicates invigorated mid-latitude cyclones. The overall increased precipitation and poleward heat transport reflect intensification of the Pacific storm track by anthropogenic aerosols. Hence, this work provides for the first time a global perspective of the impacts of Asian pollution outflows from GCMs. Furthermore, our results suggest that the multi-scale modeling framework is essential in producing the aerosol invigoration effect of deep convective clouds on the global scale.

Authors:
; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Oak Ridge Leadership Computing Facility (OLCF); Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1132227
Report Number(s):
PNNL-SA-101490
KP1703010
DOE Contract Number:  
AC05-76RL01830
Resource Type:
Journal Article
Journal Name:
Proceedings of the National Academy of Sciences of the United States of America, 111(19):6894–6899
Additional Journal Information:
Journal Name: Proceedings of the National Academy of Sciences of the United States of America, 111(19):6894–6899
Country of Publication:
United States
Language:
English
Subject:
aerosol-cloud-climate interaction; Asian pollution; multi-scale global climate model

Citation Formats

Wang, Yuan, Wang, Minghuai, Zhang, Renyi, Ghan, Steven J., Lin, Yun, Hu, Jiaxi, Pan, Bowen, Levy, Misti, Jiang, Jonathan, and Molina, Mario J. Assessing the Effects of Anthropogenic Aerosols on Pacific Storm Track Using a Multiscale Global Climate Model. United States: N. p., 2014. Web. doi:10.1073/pnas.1403364111.
Wang, Yuan, Wang, Minghuai, Zhang, Renyi, Ghan, Steven J., Lin, Yun, Hu, Jiaxi, Pan, Bowen, Levy, Misti, Jiang, Jonathan, & Molina, Mario J. Assessing the Effects of Anthropogenic Aerosols on Pacific Storm Track Using a Multiscale Global Climate Model. United States. doi:10.1073/pnas.1403364111.
Wang, Yuan, Wang, Minghuai, Zhang, Renyi, Ghan, Steven J., Lin, Yun, Hu, Jiaxi, Pan, Bowen, Levy, Misti, Jiang, Jonathan, and Molina, Mario J. Tue . "Assessing the Effects of Anthropogenic Aerosols on Pacific Storm Track Using a Multiscale Global Climate Model". United States. doi:10.1073/pnas.1403364111.
@article{osti_1132227,
title = {Assessing the Effects of Anthropogenic Aerosols on Pacific Storm Track Using a Multiscale Global Climate Model},
author = {Wang, Yuan and Wang, Minghuai and Zhang, Renyi and Ghan, Steven J. and Lin, Yun and Hu, Jiaxi and Pan, Bowen and Levy, Misti and Jiang, Jonathan and Molina, Mario J.},
abstractNote = {Atmospheric aerosols impact weather and global general circulation by modifying cloud and precipitation processes, but the magnitude of cloud adjustment by aerosols remains poorly quantified and represents the largest uncertainty in estimated forcing of climate change. Here we assess the impacts of anthropogenic aerosols on the Pacific storm track using a multi-scale global aerosol-climate model (GCM). Simulations of two aerosol scenarios corresponding to the present day and pre-industrial conditions reveal long-range transport of anthropogenic aerosols across the north Pacific and large resulting changes in the aerosol optical depth, cloud droplet number concentration, and cloud and ice water paths. Shortwave and longwave cloud radiative forcing at the top of atmosphere are changed by - 2.5 and + 1.3 W m-2, respectively, by emission changes from pre-industrial to present day, and an increased cloud-top height indicates invigorated mid-latitude cyclones. The overall increased precipitation and poleward heat transport reflect intensification of the Pacific storm track by anthropogenic aerosols. Hence, this work provides for the first time a global perspective of the impacts of Asian pollution outflows from GCMs. Furthermore, our results suggest that the multi-scale modeling framework is essential in producing the aerosol invigoration effect of deep convective clouds on the global scale.},
doi = {10.1073/pnas.1403364111},
journal = {Proceedings of the National Academy of Sciences of the United States of America, 111(19):6894–6899},
number = ,
volume = ,
place = {United States},
year = {2014},
month = {5}
}

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