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Ice‐nucleating particle emissions from photochemically aged diesel and biodiesel exhaust
Author(s) -
Schill G. P.,
Jathar S. H.,
Kodros J. K.,
Levin E. J. T.,
Galang A. M.,
Friedman B.,
Link M. F.,
Farmer D. K.,
Pierce J. R.,
Kreidenweis S. M.,
DeMott P. J.
Publication year - 2016
Publication title -
geophysical research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.007
H-Index - 273
eISSN - 1944-8007
pISSN - 0094-8276
DOI - 10.1002/2016gl069529
Subject(s) - diesel fuel , diesel exhaust , ice nucleus , biodiesel , atmospheric sciences , environmental science , diesel engine , particulates , northern hemisphere , meteorology , nucleation , chemistry , waste management , physics , thermodynamics , engineering , biochemistry , organic chemistry , catalysis
Immersion‐mode ice‐nucleating particle (INP) concentrations from an off‐road diesel engine were measured using a continuous‐flow diffusion chamber at −30°C. Both petrodiesel and biodiesel were utilized, and the exhaust was aged up to 1.5 photochemically equivalent days using an oxidative flow reactor. We found that aged and unaged diesel exhaust of both fuels is not likely to contribute to atmospheric INP concentrations at mixed‐phase cloud conditions. To explore this further, a new limit‐of‐detection parameterization for ice nucleation on diesel exhaust was developed. Using a global‐chemical transport model, potential black carbon INP (INP BC ) concentrations were determined using a current literature INP BC parameterization and the limit‐of‐detection parameterization. Model outputs indicate that the current literature parameterization likely overemphasizes INP BC concentrations, especially in the Northern Hemisphere. These results highlight the need to integrate new INP BC parameterizations into global climate models as generalized INP BC parameterizations are not valid for diesel exhaust.