Decadal Quasi-2-Day Wave Observations in the Equatorial Mesopause Region by a Meteor Radar over Kototabang (0.2°S, 100.3°E) and TIMED/TIDI and Comparison with Quasi-2-Day Wave Observations at Mid-Latitudes

Round 1

Reviewer 1 Report

Reviewer comments on manuscript #ISSN 2072-4292 entitled:

" Decadal quasi-2 day wave observations in the equatorial mesopause region by a meteor radar over Kototabang (0.2°S, 100.3°E)"

General Comments

The present manuscript addresses a statistical study of observations of quasi-two-day mesosphere waves over an equatorial location. This is an interesting phenomenon due to barotropic/baroclinic instabilities in the upper atmosphere, which has been studied since the 70s.

In general terms, the manuscript is well written and logical organized, the objectives are clearly exposed, and the methodology is described accordingly.

Despite it is not an original study, it constitutes a worth contribution which study almost an entire decade of observations at different latitudes.

On the other hand, the authors' main findings tend to support previous studies in the subject and the references employed are extensive and appropriate.  

However, there are some minor issues which were marked in the annotated manuscript enclosed. In my opinion, the manuscript will be ready for publication once these (few) issues will be addressed.

Finally, my recommendation is to return to authors for minor revision. 

 

 

 

 

Comments for author File: Comments.pdf

Author Response

Please see the attachment.

Author Response File: Author Response.docx

Reviewer 2 Report

1. Perhaps you need to think about the title. The tasks of the work are wider than the title. Can add Radar and TIDI data and comparison of QTDW at mid-latitudes?

2. Line 37 - "Many studies focus on meridional wind because the amplitudes of the meridional wind are much larger than that of the zonal wind [6,7]". QTDW amplitudes, right? And not the wind itself?

3. Line 73-75. Please specify at what latitudes the listed modes dominate?

4. Line 86. The word "Jet" is missing. The text mentions several times about the anomalous summer jet. Expand your thought. What are the anomalies? And an anomaly relative to other latitudes? Because for low latitudes, as I understand it, it is not an anomaly, but represents typical conditions.

5. In [27] DOI: is not indicated, but this work has it. Check the references, there are still sources for which the DOI is not indicated.

6. It is not obvious to me how the vertical wavelength was calculated. I think that the period is 2pi, in Figure 2(c) I don't see the heights at which there is a full period. Please add a description of the vertical wavelength calculations to Section 2.3. Methodology.

7. Why is Mohe not shown in Figure 12 in January-February?

8. "Besides" appears 15 times in the text, its synonyms are moreover, furthermore, additionally etc.

9. I couldn't see the data http://data.meridianproject.ac.cn/. Please check your data access options.

10. Figures 1b, 2e, 7, 10c. Everywhere instead of “at” is specified “@”.

11. It seems to me that table 1 overloads the paper. Maybe it's better to place table1  in the repository (for example, https://zenodo.org), and indicate the link in the text?

12. Figure 9 is a low resolution. Please improve the quality of the Figure 9.

Author Response

Please see the attachment.

Author Response File: Author Response.docx

Reviewer 3 Report

The authors present a study of the characteristics of the quasi-two-day wave (QTDW) using meteor radar over Kototabang during a long period (2003-2012). They performed a statistical study on the periodicity, occurrence time, and amplitude of QTDW. This research topic is relevant, and the analysis is well presented and described. However, some suggestions are made to highlight the results.

Major comments:

• The introduction needs a justification to support the research. The authors expose all the previous works very well, but the importance of this research needs to be added.

• I suggest combining all the statistical plots (Figures 4-7) in just one Figure to compare these events' characteristics. In this way, the discussion could be more concise.

• The discussion mentions the characteristics of QTDW; however, some discussion about the implications of your findings could help to understand the role of the wind patterns and how they can affect the upper atmosphere.

   

Minor comments:

 

 

• Consider changing quasi-two day by quasi-two-day.

• In the header of Figure 1b) appears “@”, what do it means? Correct or explain it, please. The same for Figures 8 and 10c)

• Try to improve the quality of Figure 9.

Author Response

Please see the attachment.

Author Response File: Author Response.docx

Reviewer 4 Report

Review of the paper “Decadal quasi-2 day wave observations in the equatorial meso-2 pause region by a meteor radar over Kototabang (0.2°S, 100.3°E)”

by Ruidi et al.

 

The study is dedicated to a comprehensive and detailed study of QTDWs. Despite the abundance of works devoted to these waves, there are many interesting topics that require discussion, and some of them are covered by this work. The work, of course, will be of interest to the world scientific community, corresponds to the scope of the journal and has the prospect of being published.

 

However, I have some suggestions (see below). Hence, I recommend the article for publication in “Remote Sensing” after major revision.

 

First of all, English language needs significant improvement, I would recommend the authors to contact specialists. Sometimes even the thoughts of the authors are incomprehensible. I did not correct grammatical errors, I left it for professionals, because I am not a native speaker.

 

The abstract can be shortened, some of the results that are already presented in the conclusion can be removed. But one must add a clear motivation why further study of QTDWs is necessary.

 

I'll refer to specific line numbers:

 

23 “W3 QTDW with the highest frequency” needs to be clarified or reformulated

«the highest frequency» - has nothing to do with frequency ща the wave: 1/T

 

76 what does it mean “the most common wave”

 

In the introduction it would be appropriate to refer to recent comprehensive studies of the QTDW and other short-period planetary waves based on satellite data, including the changes related to QBO, e.g., (Liu et al., 2019).

 

Liu, G., England, S. L., & Janches, D. (2019). Quasi two-, three-, and six-day planetary‐scale wave oscillations in the upper atmosphere observed by TIMED/SABER over ~17 years during 2002–2018. Journal of Geophysical Research: Space Physics, 124, 9462–9474. https://doi.org/10.1029/2019JA026918

 

Fig 2c. it is not clear how the vertical wavelength is shown and where is 23 km

 

Section 3.2 Long-term trend is not visible and is not discussed. I can only see the QBO influence.

 

353. “the QBO in zonal wind at 30 km is in phase with the QBO in QTDW between 82 km and 96 km.” - Here it would be appropriate to refer to recent studies and mention that this effect has been demonstrated, for example, in the study of Koval et al. (2022).

 

Koval, A.V., Gavrilov, N.M., Kandieva, K.K. Ermakova, T.S., Didenko, K.A. (2022) Numerical simulation of stratospheric QBO impact on the planetary waves up to the thermosphere // Scientific Reports, 12, 21701. DOI: 10.1038/s41598-022-26311-x

 

378 “It 377 can be found that the amplitude in January and February decreases or even disappears 378 with the increasing latitude.” – this fact confirms Fig. 9. You can mention it.

 

In general, the article is good. The main problem is grammar.

Author Response

Please see the attachment.

Author Response File: Author Response.docx

Round 2

Reviewer 4 Report

The manuscript is suitable for publication.