Predictions of diffusion rates of large organic molecules in secondary organic aerosols using the Stokes–Einstein and fractional Stokes–Einstein relations

Evoy, Erin; Maclean, Adrian M.; Rovelli, Grazia; Li, Ying; Tsimpidi, Alexandra P.; Karydis, Vlassis A.; Kamal, Saeid; Lelieveld, Jos; Shiraiwa, Manabu; Reid, Jonathan P.; Bertram, Allan K.

doi:https://doi.org/10.5194/acp-19-10073-2019

Articles | Volume 19, issue 15

https://doi.org/10.5194/acp-19-10073-2019

© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

https://doi.org/10.5194/acp-19-10073-2019

© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 19, issue 15

Research article

|

09 Aug 2019

Research article |

| 09 Aug 2019

Predictions of diffusion rates of large organic molecules in secondary organic aerosols using the Stokes–Einstein and fractional Stokes–Einstein relations

Erin Evoy, Adrian M. Maclean, Grazia Rovelli, Ying Li, Alexandra P. Tsimpidi, Vlassis A. Karydis, Saeid Kamal, Jos Lelieveld, Manabu Shiraiwa, Jonathan P. Reid, and Allan K. Bertram

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Status: closed

AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment

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RC1: 'Review comments for Evoy et al.', Anonymous Referee #1, 14 Apr 2019
RC2: 'Anonymous reviewer #2', Anonymous Referee #2, 08 May 2019
RC3: 'Review of "Predictions of diffusion rates of organic molecules in secondary organic aerosols using the Stokes-Einstein and fractional Stokes-Einstein relations" by Evoy et al.', Anonymous Referee #3, 02 Jul 2019
AC1: 'Author's comment to anonymous referees 1-3', Erin Evoy, 16 Jul 2019

Peer-review completion

AR: Author's response | RR: Referee report | ED: Editor decision

AR by Anna Wenzel on behalf of the Authors (18 Jul 2019) Author's response Manuscript

ED: Publish as is (18 Jul 2019) by Thorsten Bartels-Rausch

AR by Erin Evoy on behalf of the Authors (18 Jul 2019) Author's response Manuscript

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Short summary

We measured the diffusion rates of organic molecules in a number of proxies for secondary organic aerosol (SOA) and compared measured diffusion with predictions from two relations: the Stokes–Einstein relation and a fractional Stokes–Einstein relation. The fractional relation does a better job of predicting diffusion rates in this case. Output from an atmospheric model shows that mixing times predicted using the two relations differ by up to 1 order of magnitude at an altitude of ~ 3 km.