Preprints
https://doi.org/10.5194/acp-2022-778
https://doi.org/10.5194/acp-2022-778
 
14 Dec 2022
14 Dec 2022
Status: this preprint is currently under review for the journal ACP.

On the Quasi-2-Day Planetary Waves in the Middle Atmosphere During Different QBO Phases

Liang Tang1, Sheng-Yang Gu2, Shu-Yue Zhao2, and Dong Wang2 Liang Tang et al.
  • 1School of Optoelectronic Engineering, Chongqing University of Posts and Telecommunications, Chongqing, China
  • 2Electronic Information School, Wuhan University, Wuhan, China

Abstract. We found that the interannual difference of the W3 and W4 Q2DW is significantly correlated with the Quasi-Biennial Oscillation westerly (QBOW) and easterly (QBOE) phase, identified from the analysis of the 2003 to 2020 MERRA-2 and SABER atmospheric data. The amplitude of the zonal wind in the QBOE phase is approximately ∼10 m/s stronger than that in the QBOW phase. Mean zonal easterly winds are stronger in the QBOE phase than in the QBOW phase, while westerly winds are stronger in the QBOW phase. The Q2DW is present in the summer, and the background wind is easterly in both hemispheres. The mean temperature amplitudes of W3 and W4 in the QBOW phase are stronger than those in the QBOE phase, and the difference is ~2 K and ~3 K (in the Southern Hemisphere); ~2 K and ~3 K (in the Northern Hemisphere), respectively. The mean wave period of W4 in the QBOW phase in the Northern Hemisphere is shorter than that in the QBOE phase. The W3 mode is modulated by atmospheric eigenmodes in both hemispheres and shows slight differences in the QBOW and QBOE phases, while the W4 mode is more likely to show significant differences in the different QBO phases. Our diagnostic analysis suggests that the amplification of the QBOW phases W3 and W4 may be due to stronger mean-flow instabilities and background winds in the mesosphere. In addition, planetary waves gain stronger source activity during the QBOW phase to provide sufficient energy for propagation and amplification.

Liang Tang et al.

Status: open (until 25 Feb 2023)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • CC1: 'Comment on acp-2022-778', Fabrizio Sassi, 15 Dec 2022 reply
    • CC2: 'Reply on CC1', Paul PUKITE, 29 Dec 2022 reply
      • CC3: 'Reply on CC2', Paul PUKITE, 12 Jan 2023 reply

Liang Tang et al.

Liang Tang et al.

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Short summary
We found that the interannual difference of the W3 and W4 Q2DW is significantly correlated with the Quasi-Biennial Oscillation westerly (QBOW) and easterly (QBOE) phase. In addition, planetary waves gain stronger source activity during the QBOW phase to provide sufficient energy for propagation and amplification. Overall, this study reveals a difference between the dynamics of mid-latitude westward planetary waves in the QBOW and QBOE phases.
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