Using different assumptions of aerosol mixing state and  chemical composition to predict CCN concentrations  based on field measurements in urban Beijing

Ren, Jingye; Zhang, Fang; Wang, Yuying; Collins, Don; Fan, Xinxin; Jin, Xiaoai; Xu, Weiqi; Sun, Yele; Cribb, Maureen; Li, Zhanqing

doi:https://doi.org/10.5194/acp-18-6907-2018

Articles | Volume 18, issue 9

https://doi.org/10.5194/acp-18-6907-2018

© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Special issue:

Regional transport and transformation of air pollution in...

https://doi.org/10.5194/acp-18-6907-2018

© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 18, issue 9

Research article

|

16 May 2018

Research article |

| 16 May 2018

Using different assumptions of aerosol mixing state and chemical composition to predict CCN concentrations based on field measurements in urban Beijing

Jingye Ren, Fang Zhang, Yuying Wang, Don Collins, Xinxin Fan, Xiaoai Jin, Weiqi Xu, Yele Sun, Maureen Cribb, and Zhanqing Li

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Final revised paper (published on 16 May 2018)
Supplement to the final revised paper
Preprint (discussion started on 01 Nov 2017)
Supplement to the preprint

Interactive discussion

Status: closed

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

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- Supplement

RC1: 'reject, encourage to revise and resubmit', Anonymous Referee #1, 25 Nov 2017
- AC1: 'Reply to anonymous Referee 1#', Fang Zhang, 28 Nov 2017
RC2: 'Comment', Anonymous Referee #3, 28 Jan 2018

Peer-review completion

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

AR by Fang Zhang on behalf of the Authors (23 Feb 2018) Author's response Manuscript

ED: Referee Nomination & Report Request started (05 Mar 2018) by Renyi Zhang

RR by Anonymous Referee #1 (19 Mar 2018)

Suggestions for revision or reasons for rejection

This is an interesting and important study, where a closure between directly measured and calculated CCN concentrations is presented. Overall, the authors did a good job addressing the issues from the previous submission. However, several minor issues have remained. I suggest a minor revision before the paper can be accepted.

In the abstract, some of the abbreviations are left undefined. For instance, it takes some effort to realize that 'EI-SR' stands for ‘external-internal size-resolved’, as none of those words appear in the abstract.

In CCN equations, a spherical particle geometry is used and hence no assumptions about the type of particle diameter needs to be made. However, the instrument, in general, produce different diameters: mobility diameter from SMPS, volume (or mass) equivalent diameter from SP2, and aerodynamic diameter from AMS. For spherical particles, this makes no difference, but not all particles are spheres. For instance, significant fractions of fresh and aged BC are present in Beijing air. Fresh BC particles are not spheres and neither are some of the partially aged BC. This issue must be addressed.

The discussion in lines 159-162 is cryptic and so is the related discussion in lines 435-444. I understand how SP2 underestimates the aged BC particle diameter, but how would it overestimate the diameter? Also, what diameter are we talking about here?

Affiliations must be corrected (letters point to wrong institutions)

Other minor corrections
L327: remove ‘While’
L334: replace ‘activation’ with ‘activated’
L339: add ‘respectively’ before ‘S*’
L386: replace ‘most’ with ‘at least some’
L406: replace ‘slight’ with ‘slightly’
L408: replace ‘is’ with ‘are’
L465: replace ‘internal-’ with ‘internally-’

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RR by Anonymous Referee #3 (02 Apr 2018)

ED: Publish subject to minor revisions (review by editor) (05 Apr 2018) by Renyi Zhang

AR by Fang Zhang on behalf of the Authors (10 Apr 2018) Author's response Manuscript

ED: Publish subject to technical corrections (14 Apr 2018) by Renyi Zhang

AR by Fang Zhang on behalf of the Authors (16 Apr 2018) Author's response Manuscript

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