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Title: Morphology and mixing of black carbon particles collected in central California during the CARES field study

Journal Article · · Atmospheric Chemistry and Physics (Online)
 [1];  [2]; ORCiD logo [3];  [4];  [1];  [5];  [6];  [7]
  1. Univ. of the Pacific, Stockton, CA (United States)
  2. Univ. of the Pacific, Stockton, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
  3. Stony Brook Univ., Stony Brook, NY (United States); Institut de Recherches sur la Catalyse et l'Environnement de Lyon, Villeurbanne (France)
  4. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Carl Zeiss X-ray Microscopy, Inc., Pleasanton, CA (United States)
  5. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  6. Stony Brook Univ., Stony Brook, NY (United States)
  7. Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
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Aerosol absorption is strongly dependent on the internal heterogeneity (mixing state) and morphology of individual particles containing black carbon (BC) and other non-absorbing species. Here, we examine an extensive microscopic data set collected in the California Central Valley during the CARES 2010 field campaign. During a period of high photochemical activity and pollution buildup, the particle mixing state and morphology were characterized using scanning transmission X-ray microscopy (STXM) at the carbon K-edge. Observations of compacted BC core morphologies and thick organic coatings at both urban and rural sites provide evidence of the aged nature of particles, highlighting the importance of highly aged particles at urban sites during periods of high photochemical activity. Based on the observation of thick coatings and more convex BC inclusion morphology, either the aging was rapid or the contribution of fresh BC emissions at the urban site was relatively small compared to background concentrations. Most particles were observed to have the BC inclusion close to the center of the host. However, host particles containing inorganic rich inclusions had the BC inclusion closer to the edge of the particle. Finally, these measurements of BC morphology and mixing state provide important constraints for the morphological effects on BC optical properties expected in aged urban plumes.

Research Organization:
Pacific Northwest National Laboratory (PNNL), Richland, WA (United States). Environmental Molecular Sciences Laboratory (EMSL); Stony Brook Univ., NY (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Biological and Environmental Research (BER)
Grant/Contract Number:
AC05-76RL01830; SC0008613; AC02-05CH11231
OSTI ID:
1339848
Alternate ID(s):
OSTI ID: 1349438; OSTI ID: 1379590
Report Number(s):
PNNL-SA-119121; 48867; KP1704020
Journal Information:
Atmospheric Chemistry and Physics (Online), Vol. 16, Issue 22; ISSN 1680-7324
Publisher:
European Geosciences UnionCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 38 works
Citation information provided by
Web of Science

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Cited By (11)

Radiative Properties of Atmospheric Black Carbon (Soot) Particles with Complex Structures book June 2019
Microscopic Observations of Core‐Shell Particle Structure and Implications for Atmospheric Aerosol Remote Sensing journal December 2018
The Impact of Cloud Processing on the Ice Nucleation Abilities of Soot Particles at Cirrus Temperatures journal February 2020
An evaluation of three methods for measuring black carbon in Alert, Canada journal January 2017
The diverse chemical mixing state of aerosol particles in the southeastern United States journal January 2018
Ice nucleation abilities of soot particles determined with the Horizontal Ice Nucleation Chamber journal January 2018
Quantifying black carbon light absorption enhancement with a novel statistical approach journal January 2018
Role of black carbon mass size distribution in the direct aerosol radiative forcing journal January 2019
Quantitative capabilities of STXM to measure spatially resolved organic volume fractions of mixed organic ∕ inorganic particles journal January 2019
The Impact of Cloud Processing on the Ice Nucleation Abilities of Soot Particles at Cirrus Temperatures text January 2020
Ice nucleation abilities of soot particles determined with the Horizontal Ice Nucleation Chamber text January 2018

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54 ENVIRONMENTAL SCIENCES
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