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Title: Black carbon mixing state impacts on cloud microphysical properties: Effects of aerosol plume and environmental conditions

Journal Article · · Journal of Geophysical Research: Atmospheres
DOI:https://doi.org/10.1002/2016JD024851· OSTI ID:1326134
 [1];  [2];  [2]
  1. Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
  2. Univ. of Illinois at Urbana-Champaign, Urbana, IL (United States)

Black carbon (BC) is usually mixed with other aerosol species within individual aerosol particles. This mixture, along with the particles' size and morphology, determines the particles' optical and cloud condensation nuclei properties, and hence black carbon's climate impacts. In this study the particle-resolved aerosol model PartMC-MOSAIC was used to quantify the importance of black carbon mixing state for predicting cloud microphysical quantities. Based on a set of about 100 cloud parcel simulations a process level analysis framework was developed to attribute the response in cloud microphysical properties to changes in the underlying aerosol population ("plume effect") and the cloud parcel cooling rate ("parcel effect"). It shows that the response of cloud droplet number concentration to changes in BC emissions depends on the BC mixing state. When the aerosol population contains mainly aged BC particles an increase in BC emission results in increasing cloud droplet number concentrations ("additive effect"). In contrast, when the aerosol population contains mainly fresh BC particles they act as sinks for condensable gaseous species, resulting in a decrease in cloud droplet number concentration as BC emissions are increased ("competition effect"). Additionally, we quantified the error in cloud microphysical quantities when neglecting the information on BC mixing state, which is often done in aerosol models. Here, the errors ranged from -12% to +45% for the cloud droplet number fraction, from 0% to +1022% for the nucleation-scavenged black carbon (BC) mass fraction, from -12% to +4% for the effective radius, and from -30% to +60% for the relative dispersion.

Research Organization:
Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER); National Science Foundation (NSF)
Grant/Contract Number:
AC05-76RL01830; NSF ATM 07-39404; NSF ATM 09-34491; SC0003921; SC0011771
OSTI ID:
1326134
Report Number(s):
PNNL-SA-115651; KP1701000
Journal Information:
Journal of Geophysical Research: Atmospheres, Vol. 121, Issue 10; ISSN 2169-897X
Publisher:
American Geophysical UnionCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 18 works
Citation information provided by
Web of Science

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Cited By (7)

Aerosol mixing state revealed by transmission electron microscopy pertaining to cloud formation and human airway deposition journal July 2019
Radiative Properties of Atmospheric Black Carbon (Soot) Particles with Complex Structures book June 2019
Aerosol mixing state matters for particles deposition in human respiratory system journal June 2018
External and internal cloud condensation nuclei (CCN) mixtures: controlled laboratory studies of varying mixing states journal January 2019
Machine Learning to Predict the Global Distribution of Aerosol Mixing State Metrics journal January 2018
Metrics to quantify the importance of mixing state for CCN activity journal January 2017
Quantifying Impacts of Aerosol Mixing State on Nucleation-Scavenging of Black Carbon Aerosol Particles journal January 2018