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Radiative Effect and Climate Impacts of Brown Carbon with the Community Atmosphere Model (CAM5)

Journal Article · · Atmospheric Chemistry and Physics Discussions (Online)
DOI:https://doi.org/10.5194/acp-2018-676· OSTI ID:1544233
 [1];  [1];  [2];  [3];  [1];  [1];  [4];  [1];  [1]
  1. Univ. of Wyoming, Laramie, WY (United States). Dept. of Atmospheric Science
  2. Argonne National Lab. (ANL), Argonne, IL (United States)
  3. Nanjing Univ. (China). Institute for Climate and Global Change Research, School of Atmospheric Sciences
  4. Univ. of Wyoming, Laramie, WY (United States). Dept. of Atmospheric Science; Chinese Academy of Sciences (CAS), Beijing (China). International Center for Climate and Environmental Sciences, Inst. of Atmospheric Physics
A recent development in the representation of aerosols in climate models is the realization that some components of organic aerosol (OA), emitted from biomass and biofuel burning, can have a significant contribution to shortwave radiation absorption in the atmosphere. The absorbing fraction of OA is referred to as brown carbon (BrC). This study introduces one of the first implementations of BrC into the Community Atmosphere Model version 5 (CAM5), using a parameterization for BrC absorptivity described in Saleh et al. (2014). Nine-year experiments are run (2003–2011) with prescribed emissions and sea surface temperatures to analyze the effect of BrC in the atmosphere. Model validation is conducted via model comparison to single-scatter albedo and aerosol optical depth from the Aerosol Robotic Network (AERONET). This comparison reveals a model underestimation of single scattering albedo (SSA) in biomass burning regions for both default and BrC model runs, while a comparison between AERONET and the model absorption Ångström exponent shows a marked improvement with BrC implementation. Global annual average radiative effects are calculated due to aerosol–radiation interaction (REari; 0.13 ± 0.01W m-2) and aerosol–cloud interaction (REaci; 0.01 ± 0.04W m-2). REari is similar to other studies’ estimations of BrC direct radiative effect, while REaci indicates a global reduction in low clouds due to the BrC semidirect effect. The mechanisms for these physical changes are investigated and found to correspond with changes in global circulation patterns. Comparisons of BrC implementation approaches find that this implementation predicts a lower BrC REari in the Arctic regions than previous studies with CAM5. Implementation of BrC bleaching effect shows a significant reduction in REari (0.06 ± 0.008 W m-2). Also, variations in OA density can lead to differences in REari and REaci, indicating the importance of specifying this property when estimating the BrC radiative effects and when comparing similar studies.
Research Organization:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC)
Sponsoring Organization:
Environmental Protection Agency (EPA); National Science Foundation (NSF); USDA; USDOE Office of Science (SC)
OSTI ID:
1544233
Journal Information:
Atmospheric Chemistry and Physics Discussions (Online), Journal Name: Atmospheric Chemistry and Physics Discussions (Online) Journal Issue: 24 Vol. 18; ISSN 1680-7375
Publisher:
European Geosciences UnionCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (5)

Climate Forcing and Trends of Organic Aerosols in the Community Earth System Model (CESM2) journal December 2019
No evidence for brown carbon formation in ambient particles undergoing atmospherically relevant drying journal January 2020
Intercomparison of biomass burning aerosol optical properties from in situ and remote-sensing instruments in ORACLES-2016 journal January 2019
Using CESM-RESFire to understand climate–fire–ecosystem interactions and the implications for decadal climate variability journal January 2020
A novel approach to calibrating a photoacoustic absorption spectrometer using polydisperse absorbing aerosol journal January 2019

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