Articles | Volume 15, issue 14
https://doi.org/10.5194/acp-15-7841-2015
https://doi.org/10.5194/acp-15-7841-2015
Research article
 | 
16 Jul 2015
Research article |  | 16 Jul 2015

Brown carbon aerosol in the North American continental troposphere: sources, abundance, and radiative forcing

J. Liu, E. Scheuer, J. Dibb, G. S. Diskin, L. D. Ziemba, K. L. Thornhill, B. E. Anderson, A. Wisthaler, T. Mikoviny, J. J. Devi, M. Bergin, A. E. Perring, M. Z. Markovic, J. P. Schwarz, P. Campuzano-Jost, D. A. Day, J. L. Jimenez, and R. J. Weber

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AR by Anna Wenzel on behalf of the Authors (10 Jun 2015)  Author's response
ED: Publish as is (18 Jun 2015) by Neil M. Donahue
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Short summary
Brown carbon (BrC) is found throughout the US continental troposphere during a summer of extensive biomass burning and its prevalence relative to black carbon (BC) increases with altitude. A radiative transfer model based on direct measurements of aerosol scattering and absorption by BC and BrC shows BrC reduces top-of-atmosphere forcing by 20%. A method to estimate BrC radiative forcing efficiencies from surface-based measurements is provided.
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