Chemical composition-dependent hygroscopic behavior of individual ambient aerosol particles collected at a coastal site

Wu, Li; Eom, Hyo-Jin; Yoo, Hanjin; Gupta, Dhrubajyoti; Cho, Hye-Rin; Fu, Pingqing; Ro, Chul-Un

doi:https://doi.org/10.5194/acp-23-12571-2023

Articles | Volume 23, issue 19

https://doi.org/10.5194/acp-23-12571-2023

© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.

https://doi.org/10.5194/acp-23-12571-2023

© Author(s) 2023. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 23, issue 19

Research article

|

09 Oct 2023

Research article |

| 09 Oct 2023

Chemical composition-dependent hygroscopic behavior of individual ambient aerosol particles collected at a coastal site

Li Wu, Hyo-Jin Eom, Hanjin Yoo, Dhrubajyoti Gupta, Hye-Rin Cho, Pingqing Fu, and Chul-Un Ro

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Final revised paper (published on 09 Oct 2023)
Supplement to the final revised paper
Preprint (discussion started on 02 May 2023)
Supplement to the preprint

Interactive discussion

Status: closed

RC1:
'Comment on egusphere-2023-693', Anonymous Referee #1, 21 Jun 2023

The comment was uploaded in the form of a supplement: https://egusphere.copernicus.org/preprints/2023/egusphere-2023-693/egusphere-2023-693-RC1-supplement.pdf

Citation: https://doi.org/10.5194/egusphere-2023-693-RC1
- AC1: 'Reply on RC1', Chul-Un Ro, 24 Jun 2023
  
  The comment was uploaded in the form of a supplement: https://egusphere.copernicus.org/preprints/2023/egusphere-2023-693/egusphere-2023-693-AC1-supplement.pdf
  
  Citation: https://doi.org/10.5194/egusphere-2023-693-AC1
RC2:
'Comment on egusphere-2023-693', Anonymous Referee #2, 16 Jul 2023
The paper investigated the hygroscopicity of atmospheric aerosols collected on Jeju Island, Korea. Both optical microscopy and SEM-EDS were used for the analyses. The paper improves our understanding in hygroscopicity of complex ambient SSA aerosols. The paper is within the scope of ACP and well organized. The figures are present in a proper way. Overall, I suggest accepting this paper after the revision.

Here are my comments:
I found that the paper was based on 39 particles collected in one sample. How could we ensure the representative of this sample?

Line 95, an unnecessary parenthesis appeared in the sentence.

Figure 2, all the SSAs are classified as “aged SSA”. Did the authors find any nascent SSA in their study?

Figures 6&7, the caption is too simple. At least the notations of five phases should be explained in the caption.

Section 3.4, although nonSSA particles is not the main component in this paper, pure description without figure is not convenient for reading. It would be better if the authors could move one representative figure from SI into the text in this section.

The scale bar in Figure S2 was missing too.

It is necessary to present SEM images of laboratory-generated (Na, Mg)(Cl, NO3) mixture particles, maybe in Figure S3.

Figures S6-S12, what did the size in SEM image stand for? Scale bar or diameter?
Citation: https://doi.org/10.5194/egusphere-2023-693-RC2
- AC2: 'Reply on RC2', Chul-Un Ro, 20 Jul 2023
  
  We thank the reviewer very much for the positive evaluation and valuable suggestions for our work.
  Except comments #1 and #3, all the other comments suggesting the modifications in the text and figures will be respected in the final revision.
  * Comment #1: I found that the paper was based on 39 particles collected in one sample. How could we ensure the representative of this sample?
  - Resopnse: Our main focus is not the characterization of the sample. Instead, we deeply investigated the hygroscopic behavior of ambient aerosols collected at a coastal site in terms of their chemical compositions.
  * Comment #3: Figure 2, all the SSAs are classified as “aged SSA”. Did the authors find any nascent SSA in their study?
  - Response: Indeed, all the SSAs are more or less aged. We will make this clear in the text of the final revision.
  The final revision will be made later based on all reviewers’ comments.
  
  Citation: https://doi.org/10.5194/egusphere-2023-693-AC2

Peer review completion

AR: Author's response | RR: Referee report | ED: Editor decision | EF: Editorial file upload

AR by Chul-Un Ro on behalf of the Authors (16 Aug 2023) Author's response Author's tracked changes Manuscript

ED: Publish as is (29 Aug 2023) by Markus Ammann

AR by Chul-Un Ro on behalf of the Authors (29 Aug 2023)

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Short summary

Hygroscopicity of ambient marine aerosols is of critical relevance to investigate their atmospheric impacts, which, however, remain uncertain due to their complex compositions and mixing states. Therefore, a study on the hygroscopic behavior of ambient marine aerosols for understanding the phase states when interacting with water vapor at different RH levels and their subsequent impacts on the heterogeneous chemical reactions, atmospheric environment, and human health is of vital importance.