Understanding the mechanism and importance of brown carbon bleaching across the visible spectrum in biomass burning plumes from the WE-CAN campaign

Shen, Yingjie; Pokhrel, Rudra P.; Sullivan, Amy P.; Levin, Ezra J. T.; Garofalo, Lauren A.; Farmer, Delphine K.; Permar, Wade; Hu, Lu; Toohey, Darin W.; Campos, Teresa; Fischer, Emily V.; Murphy, Shane M.

doi:https://doi.org/10.5194/acp-24-12881-2024

Articles | Volume 24, issue 22

https://doi.org/10.5194/acp-24-12881-2024

© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.

https://doi.org/10.5194/acp-24-12881-2024

© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 24, issue 22

Research article

|

21 Nov 2024

Research article |

| 21 Nov 2024

Understanding the mechanism and importance of brown carbon bleaching across the visible spectrum in biomass burning plumes from the WE-CAN campaign

Yingjie Shen, Rudra P. Pokhrel, Amy P. Sullivan, Ezra J. T. Levin, Lauren A. Garofalo, Delphine K. Farmer, Wade Permar, Lu Hu, Darin W. Toohey, Teresa Campos, Emily V. Fischer, and Shane M. Murphy

Supplement

https://doi.org/10.5194/acp-24-12881-2024-supplement

Data sets

Aerosol Extinction, Scattering and Absorption (PAS CAPS) Data Shane Murphy https://doi.org/10.26023/K8P0-X4T3-TN06

Particle Into Liquid Sampler 2 (PILS2) two minute integrated cations, anions, levoglucosan, and organic acids data Amy Sullivan https://doi.org/10.26023/7TAN-TZMD-680Y

Single Particle Soot Photometer (SP2) Black Carbon Mass in Individual Particles Data Ezra Levin https://doi.org/10.26023/P8R2-RAB6-N814

CVI/UHSAS Data Darin Toohey https://doi.org/10.26023/BZ4F-EAC4-290W

PTR-ToF-MS Measurements of Selected NMVOCs Data Lu Hu and Wade Permar https://doi.org/10.26023/K9F4-2CNH-EQ0W

HR-ToF-AMS Fine-Mode Aerosol Composition Data Delphine Farmer and Sonia Kreidenweis https://doi.org/10.26023/MM2Y-ZGFQ-RB0B

Picarro G2401-m WS-CRDS CO2, CH4, CO and H2O in situ mixing ratio observations - ICARTT format Teresa Campos https://doi.org/10.26023/NNYM-Z18J-PX0Q

Aerodyne CS-108 miniQCL CO, N2O and H2O in situ mixing ratio observations - ICARTT format Teresa Campos https://doi.org/10.26023/Q888-WZRD-B70F

Particle Into Liquid Sampler 1 (PILS1) Three second integrated WSOC Data Amy Sullivan https://doi.org/10.26023/9H07-MD9K-430D

Particle Into Liquid Sampler 1 (PILS1) Sixteen second integrated Abs365 Amy Sullivan https://doi.org/10.26023/CRHY-NDT9-C30V

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Short summary

The magnitude and evolution of brown carbon (BrC) absorption remain unclear, with uncertainty in climate models. Data from the WE-CAN airborne experiment show that model parameterizations overestimate the mass absorption cross section (MAC) of BrC. Observed decreases in BrC absorption with chemical markers are due to decreasing organic aerosol (OA) mass rather than a decreasing BrC MAC, which is currently implemented in models. Water-soluble BrC contributes 23 % of total absorption at 660 nm.