The relationship between cloud condensation nuclei (CCN) concentration and light extinction of dried particles: indications of underlying aerosol processes and implications for satellite-based CCN estimates

Shinozuka, Y.; Clarke, A. D.; Nenes, A.; Jefferson, A.; Wood, R.; McNaughton, C. S.; Ström, J.; Tunved, P.; Redemann, J.; Thornhill, K. L.; Moore, R. H.; Lathem, T. L.; Lin, J. J.; Yoon, Y. J.

doi:https://doi.org/10.5194/acp-15-7585-2015

Articles | Volume 15, issue 13

https://doi.org/10.5194/acp-15-7585-2015

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

https://doi.org/10.5194/acp-15-7585-2015

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

Articles | Volume 15, issue 13

Research article

|

13 Jul 2015

Research article |

| 13 Jul 2015

The relationship between cloud condensation nuclei (CCN) concentration and light extinction of dried particles: indications of underlying aerosol processes and implications for satellite-based CCN estimates

Y. Shinozuka, A. D. Clarke, A. Nenes, A. Jefferson, R. Wood, C. S. McNaughton, J. Ström, P. Tunved, J. Redemann, K. L. Thornhill, R. H. Moore, T. L. Lathem, J. J. Lin, and Y. J. Yoon

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Final revised paper (published on 13 Jul 2015)
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Preprint (discussion started on 29 Jan 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 C1243: 'Cloud physics', Anonymous Referee #1, 31 Mar 2015
- AC C2482: 'AuthorsResponse1', Yohei Shinozuka, 12 May 2015
RC C1246: 'referee comments', Anonymous Referee #2, 31 Mar 2015
- AC C2485: 'AuthorsResponse2', Yohei Shinozuka, 12 May 2015

Peer-review completion

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

AR by Yohei Shinozuka on behalf of the Authors (20 May 2015) Author's response Manuscript

ED: Referee Nomination & Report Request started (26 May 2015) by Patricia Quinn

RR by Anonymous Referee #1 (08 Jun 2015)

Suggestions for revision or reasons for rejection

I appreciate the authors’ efforts in making significant improvements to the manuscript in response to my comments. I’d think the manuscript be ready for publication after a few minor revisions.
Authors categorized the current CCN parameterization methods into four groups. The study by Nakajima et al, 2001 only established the relationship between aerosol number concentration and AI, rather than the relationship between CCN concentration and AI. Although there is tight relationship between Na and CCN, a short description is necessary to clarify. In addition, the study by Liu et al (2011, JGR) examined the CCN-AI relationship directly using the observation over the polluted site in China.
Page 5. The study by Liu and Li actually not only accounts for the size and aerosol vertical distribution effects, but also accounts for the influence of swelling effect by considering the RH for AOD, dry and ambient aerosol scattering coefficients, as well as the potential aerosol composition effect, to some degree, by analyzing the aerosol SSA. The studies by Ghan and Collins, 2004 and Ghan et al., 2006, should also be mentioned as these studies addressed the influence of aerosol vertical distribution and swelling effect here.
The CCN concentrations used are for SS of 0.3-0.5%, does it refer to the mean CCN value for the SS range or for all of individual samples from 0.3% to 0.5% SS? The CCN concentration at 0.3% SS and 0.5% SS is different, which indicates that the same AOD may correspond to different CCN concentration. What is the uncertainty in the CCN parameterization due to the difference in CCN concentration at different SS. It should be clarified in the manuscript.
Page 11. I am surprised by your finding that the CCN-AOD relationship is insensitive to the choice of wavelength of the AOD. As suggested in the first round of review, this should be explained more clearly in the manuscript, for it is hard to believe/understand.
Page 17. The seasonal cycles and variability of the CCN-extinction relationship should be caused by the seasonal changes in aerosol types dominated in different seasons.

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RR by Patricia Quinn (15 Jun 2015)

ED: Reconsider after minor revisions (Editor review) (15 Jun 2015) by Patricia Quinn

AR by Yohei Shinozuka on behalf of the Authors (17 Jun 2015) Author's response Manuscript

ED: Publish as is (17 Jun 2015) by Patricia Quinn

AR by Yohei Shinozuka on behalf of the Authors (26 Jun 2015) Manuscript

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