Radiative effect and climate impacts of brown carbon with the Community Atmosphere Model (CAM5)

Brown, Hunter; Liu, Xiaohong; Feng, Yan; Jiang, Yiquan; Wu, Mingxuan; Lu, Zheng; Wu, Chenglai; Murphy, Shane; Pokhrel, Rudra

doi:10.5194/acp-18-17745-2018

Title: Radiative effect and climate impacts of brown carbon with the Community Atmosphere Model (CAM5)

Journal Article · Fri Dec 14 00:00:00 EST 2018 · Atmospheric Chemistry and Physics (Online)

DOI:https://doi.org/10.5194/acp-18-17745-2018· OSTI ID:1486893

Brown, Hunter; Liu, Xiaohong; Feng, Yan;

;

; Lu, Zheng;

; Murphy, Shane;

Abstract. 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 semi-direct 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±0.008W 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.

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Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC); USEPA; National Science Foundation (NSF); USDA

Grant/Contract Number:: NSF-DOE-USDA Joint Earth System Modeling Program and Earth System Modeling Program; AC02-06CH11357; 83588301

OSTI ID:: 1486893

Alternate ID(s):: OSTI ID: 1494669

Journal Information:: Atmospheric Chemistry and Physics (Online), Journal Name: Atmospheric Chemistry and Physics (Online) Vol. 18 Journal Issue: 24; ISSN 1680-7324

Publisher:: Copernicus Publications, EGUCopyright Statement

Country of Publication:: Germany

Language:: English

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