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Cloud condensation nuclei (CCN) activity of aliphatic amine secondary aerosol

Tang, X. and Price, D. and Praske, E. and Vu, D. N.. N. and Purvis-Roberts, K. and Silva, P. J. and Cocker, D. R., III and Asa-Awuku, A. (2014) Cloud condensation nuclei (CCN) activity of aliphatic amine secondary aerosol. Atmospheric Chemistry and Physics, 14 (12). pp. 5959-5967. ISSN 1680-7316. https://resolver.caltech.edu/CaltechAUTHORS:20180920-144412200

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Abstract

Aliphatic amines can form secondary aerosol via oxidation with atmospheric radicals (e.g., hydroxyl radical and nitrate radical). The particle can contain both secondary organic aerosol (SOA) and inorganic salts. The ratio of organic to inorganic materials in the particulate phase influences aerosol hygroscopicity and cloud condensation nuclei (CCN) activity. SOA formed from trimethylamine (TMA) and butylamine (BA) reactions with hydroxyl radical (OH) is composed of organic material of low hygroscopicity (single hygroscopicity parameter, κ, ≤ 0.25). Secondary aerosol formed from the tertiary aliphatic amine (TMA) with N_2O_5 (source of nitrate radical, NO_3) contains less volatile compounds than the primary aliphatic amine (BA) aerosol. As relative humidity (RH) increases, inorganic amine salts are formed as a result of acid–base reactions. The CCN activity of the humid TMA–N_2O_5 aerosol obeys Zdanovskii, Stokes, and Robinson (ZSR) ideal mixing rules. The humid BA + N_2O_5 aerosol products were found to be very sensitive to the temperature at which the measurements were made within the streamwise continuous-flow thermal gradient CCN counter; κ ranges from 0.4 to 0.7 dependent on the instrument supersaturation (ss) settings. The variance of the measured aerosol κ values indicates that simple ZSR rules cannot be applied to the CCN results from the primary aliphatic amine system. Overall, aliphatic amine aerosol systems' κ ranges within 0.2 < κ < 0.7. This work indicates that aerosols formed via nighttime reactions with amines are likely to produce hygroscopic and volatile aerosol, whereas photochemical reactions with OH produce secondary organic aerosol of lower CCN activity. The contributions of semivolatile secondary organic and inorganic material from aliphatic amines must be considered for accurate hygroscopicity and CCN predictions from aliphatic amine systems.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.5194/acp-14-5959-2014DOIArticle
ORCID:
AuthorORCID
Praske, E.0000-0001-7169-4423
Cocker, D. R., III0000-0002-0586-0769
Additional Information:© Author(s) 2014. This work is distributed under the Creative Commons Attribution 3.0 License. Received: 26 Sep 2013 – Discussion started: 02 Jan 2014 – Revised: 07 Apr 2014 – Accepted: 10 Apr 2014 – Published: 17 Jun 2014. This work was supported in part by the National Science Foundation (ENG 1032388 & ATM 0849765) and W. M. Keck Foundation. D. Vu acknowledges US Environmental Protection Agency (EPA) STAR Fellowship Assistance Agreement no. FP-91751101 for her contribution to this work. Any opinions, findings, and conclusions expressed in this material are those of the author(s) and do not necessarily reflect the views of the NSF or EPA. No endorsement is implied by the USDA for any instrument or method mentioned here to the exclusion of other methods which provide similar ability. Edited by: A. Virtanen
Funders:
Funding AgencyGrant Number
NSFCBET-1032388
NSFAGS-0849765
W. M. Keck FoundationUNSPECIFIED
Environmental Protection Agency (EPA)FP-91751101
Issue or Number:12
Record Number:CaltechAUTHORS:20180920-144412200
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20180920-144412200
Official Citation:Tang, X., Price, D., Praske, E., Vu, D. N., Purvis-Roberts, K., Silva, P. J., Cocker III, D. R., and Asa-Awuku, A.: Cloud condensation nuclei (CCN) activity of aliphatic amine secondary aerosol, Atmos. Chem. Phys., 14, 5959-5967, https://doi.org/10.5194/acp-14-5959-2014, 2014.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:89813
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:20 Sep 2018 22:49
Last Modified:22 Nov 2019 00:27

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