Model studies of volatile diesel exhaust particle formation: are organic vapours involved in nucleation and growth?

Pirjola, L.; Karl, M.; Rönkkö, T.; Arnold, F.

doi:https://doi.org/10.5194/acp-15-10435-2015

Articles | Volume 15, issue 18

https://doi.org/10.5194/acp-15-10435-2015

© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.

https://doi.org/10.5194/acp-15-10435-2015

© Author(s) 2015. This work is distributed under
the Creative Commons Attribution 3.0 License.

Articles | Volume 15, issue 18

Research article

|

23 Sep 2015

Research article |

| 23 Sep 2015

Model studies of volatile diesel exhaust particle formation: are organic vapours involved in nucleation and growth?

L. Pirjola, M. Karl, T. Rönkkö, and F. Arnold

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Final revised paper (published on 23 Sep 2015)
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Preprint (discussion started on 17 Feb 2015)
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Interactive discussion

Status: closed

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

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RC C1113: 'Review on manuscript by Pirjola et al.', Anonymous Referee #1, 25 Mar 2015
- AC C3170: 'Response to RC C1113', Liisa Pirjola, 02 Jun 2015
RC C1712: 'Review comments on Model studies of volatile diesel exhaust particle formation: Organic vapours involved in nucleation and growth?', Anonymous Referee #2, 20 Apr 2015
- AC C3171: 'Reply to RC C1712', Liisa Pirjola, 02 Jun 2015

Peer-review completion

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

AR by Liisa Pirjola on behalf of the Authors (02 Jun 2015)

ED: Referee Nomination & Report Request started (01 Jul 2015) by Kari Lehtinen

RR by Anonymous Referee #2 (18 Jul 2015)

Suggestions for revision or reasons for rejection

P4, L5: Change to “binary homogeneous nucleation” instead of “homogeneous binary nucleation”

P8, L5-17: 1o, 2o, 3o and 4o should be replaced with e.g. 1), 2), 3) and 4)

P9, L6-9: “Since AEROFOR assumes that 6 the particles are in balance with the ambient water vapour concentration it might overestimate the wet diameters of the particles.” Do you mean that the water equilibrium is not reached within the 2.7 s simulation time scale, e.g. due to gas and particle phase mass transfer limited water uptake?

You write that the results in Fig 3 is from simulations with BHN. But in the legend to Fig 3 a you write that the nucleation rate is from KIN.

I guess that the dashed lines in Fig 3a are the results from the simulation without COVs but you need to explain this with a legend or in the figure text.

Sect 3.2: You do not mention what the initial concentration of COVs and COVl was in the MARFOR model simulation but the particle composition is dominated by OMl in contrast to the AEROFOR model simulations where the organic particle mass fraction are entirely OMs. You need to write what the initial concentrations of COVs and COVl was in the MARFOR and motivate the choice of these values. I would like to know how different concentrations of COVs and COVl influences the particle number size distribution evolution in MARFOR? Is the modeled number size distribution evolution (with respect to condensation growth) sensitive to the relative concentration of COVs and COVl or is the COVs concentration always much higher than the saturation concentration so that the Kelvin effect is not important for the COVs either? I am surprised that the particle composition does not seem to differ substantially between the volatile nucleation mode, core mode and soot mode. I would have expected that the OMl would dominate in the volatile nucleation mode and OMs more in the core and soot mode if the COVl uptake onto the nucleation mode was limited by the Kelvin effect. Please explain in the paper why this is not the case.

Referee Report: PDF

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ED: Reconsider after minor revisions (Editor review) (04 Aug 2015) by Kari Lehtinen

AR by Liisa Pirjola on behalf of the Authors (14 Aug 2015) Manuscript

ED: Publish as is (07 Sep 2015) by Kari Lehtinen

AR by Liisa Pirjola on behalf of the Authors (07 Sep 2015)

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