EGU2020-2560, updated on 04 Jun 2020
https://doi.org/10.5194/egusphere-egu2020-2560
EGU General Assembly 2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

The behavior of Graviy wave during the unusual QBO structure in 2015/2016

Haiyan Li and Qingxiang Li
Haiyan Li and Qingxiang Li
  • Sun Yat-Sen University, School of Atmospheric Sciences, China (lihaiyan@whu.edu.cn)

We explored the gravity wave behavior and its role for the unusual QBO structure in 2015/2016 by analyzing the data of U.S. radiosonde with high vertical resolution over four equatorial stations from 1998 to 2017. The result implies that the gravity wave behavior should play an important role during the QBOW phase interrupted around 22 km in 2015/2016 winter. While the role of gravity wave was not as important as Kelvin waves during the prolonged and upward propagating westerly zonal wind around 27 km. The enhanced gravity wave may be generated by the instability of the stratospheric atmosphere rather than the tropospheric convection because the convection is weak during the unusual QBO structure over the four equatorial stations.

How to cite: Li, H. and Li, Q.: The behavior of Graviy wave during the unusual QBO structure in 2015/2016, EGU General Assembly 2020, Online, 4–8 May 2020, https://doi.org/10.5194/egusphere-egu2020-2560, 2020

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Presentation version 1 – uploaded on 03 May 2020
  • CC1: Comment on EGU2020-2560, Paul Pukite, 05 May 2020

    It has been a few years since the 2015-2016 QBO anomaly and the QBO cycle has re-aligned to the predicted lunisolar-nodal cycle of 28.436 months. This is the expected wave response from the gravitational forcing.

    • AC1: Reply to CC1, Qingxiang Li, 06 May 2020

      Thank you. This is a good perspective. And how much variance contribution the 28 month periodicity of QBO can explain may also affect its predictability.