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Effect of Photochemical Aging on the Ice Nucleation Properties of Diesel and Wood Burning Particles : Volume 12, Issue 6 (08/06/2012)

By Chou, C.

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Book Id: WPLBN0003996159
Format Type: PDF Article :
File Size: Pages 30
Reproduction Date: 2015

Title: Effect of Photochemical Aging on the Ice Nucleation Properties of Diesel and Wood Burning Particles : Volume 12, Issue 6 (08/06/2012)  
Author: Chou, C.
Volume: Vol. 12, Issue 6
Language: English
Subject: Science, Atmospheric, Chemistry
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Publication Date:
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications


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Chou, C., Heringa, M. F., Weingartner, E., Tritscher, T., Stetzer, O., H. Prévô, A. S.,...Baltensperger, U. (2012). Effect of Photochemical Aging on the Ice Nucleation Properties of Diesel and Wood Burning Particles : Volume 12, Issue 6 (08/06/2012). Retrieved from

Description: ETH Zurich, Institute for Atmospheric and Climate Science, Switzerland. A measurement campaign (IMBALANCE) was conducted in 2009 and aimed at characterizing the physical and chemical properties of freshly emitted and photochemically aged combustion particles emitted from a log wood burner and diesel vehicles: a EURO3 Opel Astra with a diesel oxidation catalyst (DOC) but no particle filter and a EURO2 Volkswagen Transporter TDI Syncro with no emission after-treatment. Ice nucleation experiments in the deposition and condensation freezing modes were conducted with the Portable Ice Nucleation Chamber (PINC) at three nominal temperatures, −30 °C, −35 °C and −40 °C. Freshly emitted diesel particles showed ice formation only at −40 °C in the deposition mode at 137% relative humidity with respect to ice (RHi) and 92% relative humidity with respect to water (RHw), and photochemical aging did not play a role in modifying their ice nucleation behavior. Only one diesel experiment where α-pinene was added, showed an ice nucleation enhancement after the aging at −35 °C. Wood burning particles also act as ice nuclei (IN) at −40 °C in the deposition mode at the same conditions as for diesel particles and photochemical aging did also not alter the ice formation properties of the wood burning particles. Unlike diesel particles, wood burning particles form ice via condensation freezing at −35 °C with no ice nucleation observed at −30 °C for wood burning particles. Photochemical aging did not affect the ice nucleation ability of the diesel and wood burning particles at the three different temperatures investigated but a broader range of temperatures below −30 °C need to be investigated in order to draw an overall conclusion on the effect of photochemical aging on deposition/condensation ice nucleation across the entire temperature range relevant to cold clouds.

Effect of photochemical aging on the ice nucleation properties of diesel and wood burning particles

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