期刊
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
卷 111, 期 19, 页码 6894-6899出版社
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1403364111
关键词
aerosol-cloud-climate interaction; convective storms, cloud invigoration
资金
- National Aeronautics and Space Administration (NASA) Graduate Student Fellowship in Earth System Science
- Ministry of Science and Technology of China [2013CB955800]
- NASA Research Opportunities in Space and Earth Sciences Enhancing the Capability of Computational Earth System Models and Using NASA Data for Operation and Assessment program at the Jet Propulsion Laboratory, California Institute of Technology under NASA
- Department of Energy (DOE) Office of Science, Decadal and Regional Climate Prediction using Earth System Models program
- DOE [DE-AC06-76RLO 1830]
- Office of Science of the US Department of Energy [DE-AC05-00OR22725]
- Directorate For Geosciences
- Div Atmospheric & Geospace Sciences [1048995] Funding Source: National Science Foundation
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 long-wave 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.
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