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Effects of Biomass Burning on Stratocumulus Droplet Characteristics, Drizzle Rate, and Composition

Hossein Mardi, Ali and Dadashazar, Hossein and MacDonald, Alexander B. and Crosbie, Ewan and Coggon, Matthew M. and Azadi Aghdam, Mojtaba and Woods, Roy K. and Jonsson, Haflidi H. and Flagan, Richard C. and Seinfeld, John H. and Sorooshian, Armin (2019) Effects of Biomass Burning on Stratocumulus Droplet Characteristics, Drizzle Rate, and Composition. Journal of Geophysical Research. Atmospheres, 124 (22). pp. 12301-12318. ISSN 2169-897X. doi:10.1029/2019jd031159.

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This study reports on airborne measurements of stratocumulus cloud properties under varying degrees of influence from biomass burning (BB) plumes off the California coast. Data are reported from five total airborne campaigns based in Marina, California, with two of them including influence from wildfires in different areas along the coast of the western United States. The results indicate that subcloud cloud condensation nuclei number concentration and mass concentrations of important aerosol species (organics, sulfate, nitrate) were better correlated with cloud droplet number concentration (N_d) as compared to respective above‐cloud aerosol data. Given that the majority of BB particles resided above cloud tops, this is an important consideration for future work in the region as the data indicate that the subcloud BB particles likely were entrained from the free troposphere. Lower cloud condensation nuclei activation fractions were observed for BB‐impacted clouds as compared to non‐BB clouds due, at least partly, to less hygroscopic aerosols. Relationships between N_d and either droplet effective radius or drizzle rate are preserved regardless of BB influence, indicative of how parameterizations can exhibit consistent skill for varying degrees of BB influence as long as N_d is known. Lastly, the composition of both droplet residual particles and cloud water changed significantly when clouds were impacted by BB plumes, with differences observed for different fire sources stemming largely from effects of plume aging time and dust influence.

Item Type:Article
Related URLs:
URLURL TypeDescription‐Year_Data_Set_on_Aerosol‐Cloud‐Precipitation‐Meteorology_Interactions_for_Marine_Stratocumulus_Clouds/5099983Related ItemData
Hossein Mardi, Ali0000-0002-8303-274X
Dadashazar, Hossein0000-0001-7054-4933
MacDonald, Alexander B.0000-0002-7238-3341
Crosbie, Ewan0000-0002-8895-8066
Coggon, Matthew M.0000-0002-5763-1925
Azadi Aghdam, Mojtaba0000-0002-1720-2894
Woods, Roy K.0000-0002-3632-6374
Jonsson, Haflidi H.0000-0003-3043-1074
Flagan, Richard C.0000-0001-5690-770X
Seinfeld, John H.0000-0003-1344-4068
Sorooshian, Armin0000-0002-2243-2264
Additional Information:© 2019 American Geophysical Union. Received 12 JUN 2019; Accepted 29 OCT 2019; Accepted article online 7 NOV 2019; Published online 28 NOV 2019. All data used in this work can be found on the Figshare database (Sorooshian et al., 2018;‐Year_Data_Set_on_Aerosol‐Cloud‐Precipitation‐Meteorology_Interactions_for_Marine_Stratocumulus_Clouds/5099983). This work was funded by Office of Naval Research grants N00014‐10‐1‐0811, N00014‐11‐1‐0783, N00014‐10‐1‐0200, N00014‐04‐1‐0118, and N00014‐16‐1‐2567. This work was also partially supported by NASA grant 80NSSC19K0442 in support of the ACTIVATE Earth Venture Suborbital‐3 (EVS‐3) investigation, which is funded by NASA's Earth Science Division and managed through the Earth System Science Pathfinder Program Office.
Funding AgencyGrant Number
Office of Naval Research (ONR)N00014‐10‐1‐0811
Office of Naval Research (ONR)N00014‐11‐1‐0783
Office of Naval Research (ONR)N00014‐10‐1‐0200
Office of Naval Research (ONR)N00014‐04‐1‐0118
Office of Naval Research (ONR)N00014‐16‐1‐2567
Subject Keywords:Biomass Burning; Stratocumulus; Aerosol; Cloud; EVS‐3; ACTIVATE
Issue or Number:22
Record Number:CaltechAUTHORS:20191210-083307503
Persistent URL:
Official Citation:Mardi, A. H., Dadashazar, H., MacDonald, A. B., Crosbie, E., Coggon, M. M., Aghdam, M. A., et al. (2019). Effects of biomass burning on stratocumulus droplet characteristics, drizzle rate, and composition. Journal of Geophysical Research: Atmospheres, 124, 12301–12318.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:100256
Deposited By: Tony Diaz
Deposited On:10 Dec 2019 21:10
Last Modified:16 Nov 2021 17:52

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