Preprints
https://doi.org/10.5194/acp-2021-395
https://doi.org/10.5194/acp-2021-395

  01 Jun 2021

01 Jun 2021

Review status: this preprint is currently under review for the journal ACP.

Weakening of Antarctic Stratospheric Planetary Wave Activities in Early Austral Spring Since the Early 2000s: A Response to Sea Surface Temperature Trends

Yihang Hu, Wenshou Tian, Jiankai Zhang, Tao Wang, and Mian Xu Yihang Hu et al.
  • Key Laboratory for Semi-Arid Climate Change of the Ministry of Education, College of Atmospheric Sciences, Lanzhou University, China

Abstract. Using multiple reanalysis datasets and modeling simulations, the trends of Antarctic stratospheric planetary wave activities in early austral spring since the early 2000s are investigated in this study. We find that the stratospheric planetary wave activities in September have weakened significantly since 2000, which is related to the weakening of the tropospheric wave sources in the extratropical southern hemisphere. Further analysis indicates that the trend of September sea surface temperature (SST) over 20° N–70° S is statistically linked to the weakening of stratospheric planetary wave activities. Numerical simulations support the result that the SST trend in the extratropical southern hemisphere (20° S–70° S) and the tropics (20° N–20° S) induce the weakening of wave-1 component of tropospheric geopotential height in the extratropical southern hemisphere, which subsequently leads to the decrease in stratospheric wave flux. The responses of stratospheric wave activities in the southern hemisphere to stratospheric ozone recovery is not significant in simulations. In addition, both reanalysis data and numerical simulations indicate that the Brewer-Dobson circulation (BDC) related to wave activities in the stratosphere has also been weakening in early austral spring since 2000 due to the trend of September SST in the tropics and extratropical southern hemisphere.

Yihang Hu et al.

Status: open (until 13 Jul 2021)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse

Yihang Hu et al.

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Short summary
We find that the Antarctic stratospheric wave activities in September have been weakening significantly since 2000s. Further analysis support that the SST trend over 20° N–70° S leads to the weakening of stratospheric wave activities, while the response of stratospheric wave activities to ozone recovery is week. These results indicate that the SST trend should be taken into consideration when exploring the mechanism for the climate transition in the southern hemispheric stratosphere around 2000.
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