the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Numerical modeling of relative contribution of planetary waves to the atmospheric circulation
- 1Atmospheric Physics Department, Saint-Petersburg State University, Saint Petersburg, 199034, Russia
- 2Department of Meteorological Forecasts, Russian State Hydrometeorological University, 195196 Saint-Petersburg, Russia
- 3Physikalisch-Meteorologisches Observatorium, Davos World Radiation Centre, Davos Dorf, 7260, Switzerland
- 1Atmospheric Physics Department, Saint-Petersburg State University, Saint Petersburg, 199034, Russia
- 2Department of Meteorological Forecasts, Russian State Hydrometeorological University, 195196 Saint-Petersburg, Russia
- 3Physikalisch-Meteorologisches Observatorium, Davos World Radiation Centre, Davos Dorf, 7260, Switzerland
Abstract. Using the general circulation model of the middle and upper atmosphere (MUAM), a number of numerical scenarios were implemented to study the impact of individual planetary waves (PWs) on the global atmospheric circulation, including zonal wind, temperature, and residual meridional circulation. The calculations were performed for the winter conditions of the Northern Hemisphere (January–February). The contribution to the formation of the dynamic and temperature regimes of the middle and upper atmosphere made by equatorial Kelvin waves propagating to the east, as well as atmospheric normal modes with periods from 4 to 16 days is shown. In particular, it is demonstrated that the impact of a 5-day PW and an ultrafast Kelvin wave can change the speed of circulation flows by up to 5 % in the areas of their amplitude maxima. The presented research results are important for a deeper understanding of the mechanisms of large-scale atmospheric interactions. Despite the obviousness and simplicity of the problem, such work has not been carried out at the moment.
Andrey V. Koval et al.
Status: open (until 24 Feb 2023)
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RC1: 'Comment on acp-2022-816', Anonymous Referee #1, 27 Jan 2023
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This paper demonstrates that the contributions of individual UFKWs and PWs to changes in zonal-mean temperatures and zonal winds throughout the atmosphere are insignificant, i.e., a negative result. All other aspects of the paper in terms of approach and interpretation are very good, and I suppose it is useful to know that these waves have insignificant impacts on the mean state of the atmosphere; hence my "fair" instead" of "low" rating under "Scientific significance" above. Â However, I do not see the justification for a whole paper appearing in the open literature to report this result. Based on my knowledge of their other works, these authors have a great model, great ideas and great scientific insights, and I am sure that they will find a way to introduce a few sentences in one of their forthcoming papers to report this result, as an aside to the main theme of that paper.
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AC1: 'Reply on RC1', Andrey Koval, 27 Jan 2023
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First of all, on behalf of the co-authors, I would like to thank the reviewer for the positive feedback about our scientific team, as well as about the structure of the manuscript. Indeed, we still have many new ideas and we are always open for cooperation!
As for the reviewer's main remark, we do not quite agree with the assessment of "insignificant" and "negative".
Even if we look at the two-month average wind and RMC distributions, we can see that the statistically confirmed contribution of some waves to circulation changes can reach several percent. At the same time, at certain moments, this effect is much stronger, as shown in Figs. 4 and 5. In addition, the waves can be superimposed on one another, and their effect can be summarized. I.e., the cumulative effect of the considered waves can significantly increase at certain moments of time. This conclusion, although it looks quite obvious, is documented by us for the first time. We can articulate this thought more clearly in the final version of the manuscript.
We believe that it would be interesting to present such a study to a wide scientific community as separate paper: the most simplified statement of the problem, with clear focus only on the contribution of the PWs.
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AC1: 'Reply on RC1', Andrey Koval, 27 Jan 2023
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CC1: 'Comment on acp-2022-816', Elena N. Savenkova, 30 Jan 2023
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Dear colleagues, I would like to add that, according to Pogoreltsev et al., (2014), the direct effect of the atmospheric normal modes (NM) we have considered, can be enhanced also due to their nonlinear interactions with the mean flow. This occurs buy the interference of NMs and stationary PWs, when their phases coincide. Finally, this causes deceleration of the mean flow, creating better conditions for the SSW onset.ÂÂPogoreltsev, A. I., Savenkova, E. N., Pertsev, N. N. (2014), Sudden stratopheric warmings: the role of normal atmospheric modes. Geomagnetism and Aeronomy 54(2), 1–15. doi 10.1134/S0016793214020169
Andrey V. Koval et al.
Andrey V. Koval et al.
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