Dynamical evolution of a minor sudden stratospheric warming in the Southern Hemisphere in 2019

Liu, Guangyu; Hirooka, Toshihiko; Eguchi, Nawo; Krüger, Kirstin

doi:https://doi.org/10.5194/acp-22-3493-2022

Articles | Volume 22, issue 5

https://doi.org/10.5194/acp-22-3493-2022

© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.

https://doi.org/10.5194/acp-22-3493-2022

© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 22, issue 5

Research article

|

16 Mar 2022

Research article |

| 16 Mar 2022

Dynamical evolution of a minor sudden stratospheric warming in the Southern Hemisphere in 2019

Guangyu Liu, Toshihiko Hirooka, Nawo Eguchi, and Kirstin Krüger

Data sets

The JRA-55 Reanalysis: general specifications and basic characteristics (https://jra.kishou.go.jp/JRA-55/index_en.html) S. Kobayashi, Y. Ota, Y. Harada, A. Ebita, M. Moriya, H. Onoda, K. Onogi, H. Kamahori, C. Kobayashi, H. Endo, K. Miyaoka, and K. Takahashi https://doi.org/10.2151/jmsj.2015-001

Short summary

The sudden stratospheric warming (SSW) event that occurred in September 2019 in the Southern Hemisphere was analyzed. A large warming and decelerated westerly winds were observed in the southern polar region. Since a reversal from westerly to easterly winds did not take place SSW2019 was classified as a minor SSW. The total wave forcing and the contribution from PW1 were larger in 2019. The strong and long-lasting planetary-scale waves with zonal wavenumber 1 played a role in SSW2019.