Diesel soot aging in urban plumes within hours under cold dark and humid conditions

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http://hdl.handle.net/10138/227976

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Eriksson , A C , Wittbom , C , Roldin , P , Sporre , M , Str M , E , Nilsson , P , Martinsson , J , Rissler , J , Nordin , E Z , Svenningsson , B , Pagels , J & Swietlicki , E 2017 , ' Diesel soot aging in urban plumes within hours under cold dark and humid conditions ' , Scientific Reports , vol. 7 , 12364 . https://doi.org/10.1038/s41598-017-12433-0

Title: Diesel soot aging in urban plumes within hours under cold dark and humid conditions
Author: Eriksson, A. C.; Wittbom, C.; Roldin, P.; Sporre, M.; Str M, E.; Nilsson, P.; Martinsson, J.; Rissler, J.; Nordin, E. Z.; Svenningsson, B.; Pagels, J.; Swietlicki, E.
Contributor: University of Helsinki, Department of Physics
Date: 2017-09-28
Language: eng
Number of pages: 10
Belongs to series: Scientific Reports
ISSN: 2045-2322
URI: http://hdl.handle.net/10138/227976
Abstract: Fresh and aged diesel soot particles have different impacts on climate and human health. While fresh diesel soot particles are highly aspherical and non-hygroscopic, aged particles are spherical and hygroscopic. Aging and its effect on water uptake also controls the dispersion of diesel soot in the atmosphere. Understanding the timescales on which diesel soot ages in the atmosphere is thus important, yet knowledge thereof is lacking. We show that under cold, dark and humid conditions the atmospheric transformation from fresh to aged soot occurs on a timescale of less than five hours. Under dry conditions in the laboratory, diesel soot transformation is much less efficient. While photochemistry drives soot aging, our data show it is not always a limiting factor. Field observations together with aerosol process model simulations show that the rapid ambient diesel soot aging in urban plumes is caused by coupled ammonium nitrate formation and water uptake.
Subject: AEROSOL MASS-SPECTROMETER
VOLATILE ORGANIC-COMPOUNDS
MASTER CHEMICAL MECHANISM
HUMAN RESPIRATORY-TRACT
MCM V3 PART
BLACK CARBON
MIXING STATE
TROPOSPHERIC DEGRADATION
EXHAUST PARTICLES
ATMOSPHERIC AEROSOLS
114 Physical sciences
116 Chemical sciences
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