title: Assessing the effects of anthropogenic aerosols on Pacific storm track using a multiscale global climate model.
abstract: Atmospheric aerosols affect 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 effects of anthropogenic aerosols on the Pacific storm track, using a multiscale global aerosol-climate model (GCM). Simulations of two aerosol scenarios corresponding to the present day and preindustrial 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 preindustrial to present day, and an increased cloud top height indicates invigorated midlatitude 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 to the authors' knowledge, a global perspective of the effects of Asian pollution outflows from GCMs. Furthermore, our results suggest that the multiscale modeling framework is essential in producing the aerosol invigoration effect of deep convective clouds on a global scale.
authors.affiliation: Department of Atmospheric Sciences, Texas A&M University, College Station, TX 77843;Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109;
authors.forename: Yuan
authors.initials: Y
authors.lastname: Wang
authors.affiliation: Pacific Northwest National Laboratory, Richland, WA 99354;
authors.forename: Minghuai
authors.initials: M
authors.lastname: Wang
authors.affiliation: Department of Atmospheric Sciences, Texas A&M University, College Station, TX 77843;State Key Joint Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing 100871, China; and renyi-zhang@tamu.edu mjmolina@ucsd.edu.
authors.forename: Renyi
authors.initials: R
authors.lastname: Zhang
authors.affiliation: Pacific Northwest National Laboratory, Richland, WA 99354;
authors.forename: Steven J
authors.initials: SJ
authors.lastname: Ghan
authors.affiliation: Department of Atmospheric Sciences, Texas A&M University, College Station, TX 77843;
authors.forename: Yun
authors.initials: Y
authors.lastname: Lin
authors.affiliation: Department of Atmospheric Sciences, Texas A&M University, College Station, TX 77843;
authors.forename: Jiaxi
authors.initials: J
authors.lastname: Hu
authors.affiliation: Department of Atmospheric Sciences, Texas A&M University, College Station, TX 77843;
authors.forename: Bowen
authors.initials: B
authors.lastname: Pan
authors.affiliation: Department of Atmospheric Sciences, Texas A&M University, College Station, TX 77843;
authors.forename: Misti
authors.initials: M
authors.lastname: Levy
authors.affiliation: Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA 91109;
authors.forename: Jonathan H
authors.initials: JH
authors.lastname: Jiang
authors.affiliation: Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, CA 92093 renyi-zhang@tamu.edu mjmolina@ucsd.edu.
authors.forename: Mario J
authors.initials: MJ
authors.lastname: Molina
mesh_terms: D000336:Aerosols / Q000737:chemistry*; D000393:Air Pollutants / Q000737:chemistry*; D001208:Asia; D001272:Atmosphere / Q000737:chemistry*; D002980:Climate; D055867:Cyclonic Storms; D006801:Humans; D007221:Industry; D008962:Models, Theoretical; D010140:Pacific Ocean
chemical_list: D000336:Aerosols; D000393:Air Pollutants
keywords: aerosol-cloud–climate interaction; convective storms, cloud invigoration
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