Radiative effect and climate impacts of brown carbon with the Community Atmosphere Model (CAM5)
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...
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ftdoajarticles:oai:doaj.org/article:8ba842f43b484d6ba87892c404d41df1 2023-05-15T13:06:53+02:00 Radiative effect and climate impacts of brown carbon with the Community Atmosphere Model (CAM5) H. Brown X. Liu Y. Feng Y. Jiang M. Wu Z. Lu C. Wu S. Murphy R. Pokhrel 2018-12-01T00:00:00Z https://doi.org/10.5194/acp-18-17745-2018 https://doaj.org/article/8ba842f43b484d6ba87892c404d41df1 EN eng Copernicus Publications https://www.atmos-chem-phys.net/18/17745/2018/acp-18-17745-2018.pdf https://doaj.org/toc/1680-7316 https://doaj.org/toc/1680-7324 doi:10.5194/acp-18-17745-2018 1680-7316 1680-7324 https://doaj.org/article/8ba842f43b484d6ba87892c404d41df1 Atmospheric Chemistry and Physics, Vol 18, Pp 17745-17768 (2018) Physics QC1-999 Chemistry QD1-999 article 2018 ftdoajarticles https://doi.org/10.5194/acp-18-17745-2018 2022-12-31T16:11:16Z 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±0.01 W m −2 ) and aerosol–cloud interaction (REaci; 0.01±0.04 W 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±0.008 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. Article in Journal/Newspaper Aerosol Robotic Network albedo Arctic Directory of Open Access Journals: DOAJ Articles Arctic Atmospheric Chemistry and Physics 18 24 17745 17768 |
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Open Polar |
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Directory of Open Access Journals: DOAJ Articles |
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ftdoajarticles |
language |
English |
topic |
Physics QC1-999 Chemistry QD1-999 |
spellingShingle |
Physics QC1-999 Chemistry QD1-999 H. Brown X. Liu Y. Feng Y. Jiang M. Wu Z. Lu C. Wu S. Murphy R. Pokhrel Radiative effect and climate impacts of brown carbon with the Community Atmosphere Model (CAM5) |
topic_facet |
Physics QC1-999 Chemistry QD1-999 |
description |
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±0.01 W m −2 ) and aerosol–cloud interaction (REaci; 0.01±0.04 W 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±0.008 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. |
format |
Article in Journal/Newspaper |
author |
H. Brown X. Liu Y. Feng Y. Jiang M. Wu Z. Lu C. Wu S. Murphy R. Pokhrel |
author_facet |
H. Brown X. Liu Y. Feng Y. Jiang M. Wu Z. Lu C. Wu S. Murphy R. Pokhrel |
author_sort |
H. Brown |
title |
Radiative effect and climate impacts of brown carbon with the Community Atmosphere Model (CAM5) |
title_short |
Radiative effect and climate impacts of brown carbon with the Community Atmosphere Model (CAM5) |
title_full |
Radiative effect and climate impacts of brown carbon with the Community Atmosphere Model (CAM5) |
title_fullStr |
Radiative effect and climate impacts of brown carbon with the Community Atmosphere Model (CAM5) |
title_full_unstemmed |
Radiative effect and climate impacts of brown carbon with the Community Atmosphere Model (CAM5) |
title_sort |
radiative effect and climate impacts of brown carbon with the community atmosphere model (cam5) |
publisher |
Copernicus Publications |
publishDate |
2018 |
url |
https://doi.org/10.5194/acp-18-17745-2018 https://doaj.org/article/8ba842f43b484d6ba87892c404d41df1 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Aerosol Robotic Network albedo Arctic |
genre_facet |
Aerosol Robotic Network albedo Arctic |
op_source |
Atmospheric Chemistry and Physics, Vol 18, Pp 17745-17768 (2018) |
op_relation |
https://www.atmos-chem-phys.net/18/17745/2018/acp-18-17745-2018.pdf https://doaj.org/toc/1680-7316 https://doaj.org/toc/1680-7324 doi:10.5194/acp-18-17745-2018 1680-7316 1680-7324 https://doaj.org/article/8ba842f43b484d6ba87892c404d41df1 |
op_doi |
https://doi.org/10.5194/acp-18-17745-2018 |
container_title |
Atmospheric Chemistry and Physics |
container_volume |
18 |
container_issue |
24 |
container_start_page |
17745 |
op_container_end_page |
17768 |
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1766025113109528576 |