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Title: A new approach to modeling aerosol effects on East Asian climate: Parametric uncertainties associated with emissions, cloud microphysics, and their interactions: AEROSOL EFFECTS ON EAST ASIAN CLIMATE

In this study, we adopt a parametric sensitivity analysis framework that integrates the quasi-Monte Carlo parameter sampling approach and a surrogate model to examine aerosol effects on the East Asian Monsoon climate simulated in the Community Atmosphere Model (CAM5). A total number of 256 CAM5 simulations are conducted to quantify the model responses to the uncertain parameters associated with cloud microphysics parameterizations and aerosol (e.g., sulfate, black carbon (BC), and dust) emission factors and their interactions. Results show that the interaction terms among parameters are important for quantifying the sensitivity of fields of interest, especially precipitation, to the parameters. The relative importance of cloud-microphysics parameters and emission factors (strength) depends on evaluation metrics or the model fields we focused on, and the presence of uncertainty in cloud microphysics imposes an additional challenge in quantifying the impact of aerosols on cloud and climate. Due to their different optical and microphysical properties and spatial distributions, sulfate, BC, and dust aerosols have very different impacts on East Asian Monsoon through aerosol-cloud-radiation interactions. The climatic effects of aerosol do not always have a monotonic response to the change of emission factors. The spatial patterns of both sign and magnitude of aerosol-induced changes in radiativemore » fluxes, cloud, and precipitation could be different, depending on the aerosol types, when parameters are sampled in different ranges of values. We also identify the different cloud microphysical parameters that show the most significant impact on climatic effect induced by sulfate, BC and dust, respectively, in East Asia.« less
Authors:
 [1] ;  [2] ;  [2] ; ORCiD logo [2] ;  [3] ;  [4] ;  [5] ;  [6]
  1. College of Atmospheric Sciences, Lanzhou University, Lanzhou China; Pacific Northwest National Laboratory, Richland Washington USA
  2. Pacific Northwest National Laboratory, Richland Washington USA
  3. Institute for Climate and Global Change Research and School of Atmospheric Science, Nanjing University, Nanjing China; Jiangsu Collaborative Innovation Center for Climate Change, Nanjing China
  4. Pacific Northwest National Laboratory, Richland Washington USA; Institute for Climate and Global Change Research and School of Atmospheric Science, Nanjing University, Nanjing China
  5. Department of Atmospheric Science, University of Wyoming, Laramie Wyoming USA
  6. College of Atmospheric Sciences, Lanzhou University, Lanzhou China; Department of Atmospheric Sciences, University of Washington, Seattle Washington USA
Publication Date:
OSTI Identifier:
1229995
Report Number(s):
PNNL-SA-109382
Journal ID: ISSN 2169-897X; KP1703010
DOE Contract Number:
AC05-76RL01830
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Geophysical Research: Atmospheres; Journal Volume: 120; Journal Issue: 17
Publisher:
American Geophysical Union
Research Org:
Pacific Northwest National Laboratory (PNNL), Richland, WA (US)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
aerosol; East Asian climate; emissions; cloud microphysics