Radiative effect and climate impacts of brown carbon with the Community Atmosphere Model (CAM5)
Abstract
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 inmore »
- Publication Date:
- Research Org.:
- Argonne National Laboratory (ANL), Argonne, IL (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC); USEPA; National Science Foundation (NSF); USDA
- OSTI Identifier:
- 1486893
- Alternate Identifier(s):
- OSTI ID: 1494669
- Grant/Contract Number:
- NSF-DOE-USDA Joint Earth System Modeling Program and Earth System Modeling Program; AC02-06CH11357; 83588301
- Resource Type:
- Published Article
- Journal Name:
- Atmospheric Chemistry and Physics (Online)
- Additional Journal Information:
- Journal Name: Atmospheric Chemistry and Physics (Online) Journal Volume: 18 Journal Issue: 24; Journal ID: ISSN 1680-7324
- Publisher:
- Copernicus Publications, EGU
- Country of Publication:
- Germany
- Language:
- English
- Subject:
- 54 ENVIRONMENTAL SCIENCES
Citation Formats
Brown, Hunter, Liu, Xiaohong, Feng, Yan, Jiang, Yiquan, Wu, Mingxuan, Lu, Zheng, Wu, Chenglai, Murphy, Shane, and Pokhrel, Rudra. Radiative effect and climate impacts of brown carbon with the Community Atmosphere Model (CAM5). Germany: N. p., 2018.
Web. doi:10.5194/acp-18-17745-2018.
Brown, Hunter, Liu, Xiaohong, Feng, Yan, Jiang, Yiquan, Wu, Mingxuan, Lu, Zheng, Wu, Chenglai, Murphy, Shane, & Pokhrel, Rudra. Radiative effect and climate impacts of brown carbon with the Community Atmosphere Model (CAM5). Germany. https://doi.org/10.5194/acp-18-17745-2018
Brown, Hunter, Liu, Xiaohong, Feng, Yan, Jiang, Yiquan, Wu, Mingxuan, Lu, Zheng, Wu, Chenglai, Murphy, Shane, and Pokhrel, Rudra. Fri .
"Radiative effect and climate impacts of brown carbon with the Community Atmosphere Model (CAM5)". Germany. https://doi.org/10.5194/acp-18-17745-2018.
@article{osti_1486893,
title = {Radiative effect and climate impacts of brown carbon with the Community Atmosphere Model (CAM5)},
author = {Brown, Hunter and Liu, Xiaohong and Feng, Yan and Jiang, Yiquan and Wu, Mingxuan and Lu, Zheng and Wu, Chenglai and Murphy, Shane and Pokhrel, Rudra},
abstractNote = {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.},
doi = {10.5194/acp-18-17745-2018},
journal = {Atmospheric Chemistry and Physics (Online)},
number = 24,
volume = 18,
place = {Germany},
year = {Fri Dec 14 00:00:00 EST 2018},
month = {Fri Dec 14 00:00:00 EST 2018}
}
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