Relationships between Aerosol and Raindrop Size Distributions during Rainfall Period (Changma) in Jeju Island, Korea

Round 1

Reviewer 1 Report

In the study of the change of aerosol particles removed by rainfall, there are studies on the relationship between the size of aerosol particles and the size of raindrops using modeling, but there are few studies using field observation data. Therefore, the content of this study can be regarded as a good case study based on actual values. It is believed that the purpose and results of the study were well organized. However, this study is considered a preliminary study, and it is expected that scavenging coefficient and correlation coefficient can be presented using more long-term data from a statistical point of view in the future.

Author Response

We thank the editor and reviewers on their extensive assessment of our manuscript and for providing suggestions and useful insights. We have incorporated the corrections and modifications as suggested by the reviewers in the revised manuscript. The changes have been highlighted in blue font.
We tried our best to improve this paper according to the reviewers’ comments. We believe this study is significant because it is related to the relationship between aerosol and raindrop size distribution in Korea during the Changma period, an important period in terms of annual precipitation. We hope that the revised paper is considered for publication.

Author Response File: Author Response.docx

Reviewer 2 Report

 

This is an interesting study, but I think the authors should clarify the following points before further consideration:

1. Based on the dataset, I noted that the selected rain amount only include 4 days, and the data is stale, 10 years ago. So (1) How such few samples can stand for the whole Changma in Korea? (2) how could the scavenging processes represents the present, since the chemical compounds of PM has changed a lot?

2: Line 77: “km2” 2 should be superscript.

3: Line 142: What is the author want to explain in this section? As shown in Figure 2, most diameters between aerosol and raindrop are irrelevant.

4: The authors mentioned winds, and humidity could influence scavenging effect, but I did not see the related discussion in the main text.

Author Response

We thank the editor and reviewers on their extensive assessment of our manuscript and for providing suggestions and useful insights. We have incorporated the corrections and modifications as suggested by the reviewers in the revised manuscript. The changes have been highlighted in blue font.
We tried our best to improve this paper according to the reviewers’ comments. We believe this study is significant because it is related to the relationship between aerosol and raindrop size distribution in Korea during the Changma period, an important period in terms of annual precipitation. We hope that the revised paper is considered for publication.

Author Response File: Author Response.docx

Reviewer 3 Report

This paper studies the scavenging of aerosols below cloud  on an island off Korea.  The paper presents an interesting set of data relating aerosol particles by size with captured rain drops. Observations of this kind are relatively rare so the results are useful for workers in cloud microphysics and aerosol scavenging.  The paper is well written and the interpretation relies on known theory for scavenging. 

There is a potential for an added effect on scavenging--electrical charge,  The measurements did not include any information on charging. However, the authors might comment on its possible effect that could modify their results.

Author Response

We thank the editor and reviewers on their extensive assessment of our manuscript and for providing suggestions and useful insights. We have incorporated the corrections and modifications as suggested by the reviewers in the revised manuscript. The changes have been highlighted in blue font.
We tried our best to improve this paper according to the reviewers’ comments. We believe this study is significant because it is related to the relationship between aerosol and raindrop size distribution in Korea during the Changma period, an important period in terms of annual precipitation. We hope that the revised paper is considered for publication.

Author Response File: Author Response.docx

Reviewer 4 Report

This manuscript investigated the relationship between aerosols and raindrops observed at Gosan, Jeju Island, Korea during a heavy rainfall period from July 1 to 15, 2012. Four cases were identified based on the rain amount. Large variation in aerosol and raindrop size distribution were observed during the rain period.  Collision efficiency, constituted by Brownian diffusion, interception and impaction, was also investigated for various aerosol and raindrop distribution. The authors also compared the scavenging coefficient and below-cloud scavenging rate produced for various aerosol diameters.

The manuscript was clearly written, and the flow was smooth. The conclusion in the manuscript was well supported by the results and the discussion. I recommend publication after minor revision as below:

General comments:

1. Did the authors consider other meteorological condition in the analysis as they mentioned in the introduction that scavenging effects can be affected by wind speed as well?

2. Sect. 2: What is the time resolution of the measurement?

3. Eqn. 1: ‘Y’ at the numerator should be the mean of Y.

4. Eqn. 4: Remove ‘,v’.

5. Fig. 2: The color scale is not symmetrical for negative and positive values, and the figures look a bit bias in terms of the colors.

6. Fig. 4a: The y-axis should be the same as the x-axis.

Author Response

We thank the editor and reviewers on their extensive assessment of our manuscript and for providing suggestions and useful insights. We have incorporated the corrections and modifications as suggested by the reviewers in the revised manuscript. The changes have been highlighted in blue font.
We tried our best to improve this paper according to the reviewers’ comments. We believe this study is significant because it is related to the relationship between aerosol and raindrop size distribution in Korea during the Changma period, an important period in terms of annual precipitation. We hope that the revised paper is considered for publication.

Author Response File: Author Response.docx

Round 2

Reviewer 2 Report

I think the authors has replayed the comments properly, so I recommend the manuscript for publication.