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Title: Estimating Black Carbon Aging Time-Scales with a Particle-Resolved Aerosol Model

Understanding the aging process of aerosol particles is important for assessing their chemical reactivity, cloud condensation nuclei activity, radiative properties and health impacts. In this study we investigate the aging of black carbon containing particles in an idealized urban plume using a new approach, the particleresolved aerosol model PartMC-MOSAIC. We present a method to estimate aging time-scales using an aging criterion based on cloud condensation nuclei activation. The results show a separation into a daytime regime where condensation dominates and a nighttime regime where coagulation dominates. For the chosen urban plume scenario, depending on the supersaturation threshold, the values for the aging timescales vary between 0.06 hours and 10 hours during the day, and between 6 hours and 20 hours during the night.
Authors:
; ; ;
Publication Date:
OSTI Identifier:
973702
Report Number(s):
PNNL-SA-64948
Journal ID: ISSN 0021-8502; JALSB7; TRN: US201006%%945
DOE Contract Number:
AC05-76RL01830
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Aerosol Science, (41):143-158; Journal Volume: 41
Research Org:
Pacific Northwest National Laboratory (PNNL), Richland, WA (US)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; AEROSOLS; AGING; CARBON; CLOUDS; CONDENSATION NUCLEI; PLUMES; URBAN AREAS; TIME DEPENDENCE; ATMOSPHERIC CHEMISTRY