Preprints
https://doi.org/10.5194/acp-2020-990
https://doi.org/10.5194/acp-2020-990

  03 Nov 2020

03 Nov 2020

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

Contribution of air-mass transport via the South Asia High to the deep stratosphere in summer

Yu Liu Yu Liu
  • State Key Laboratory of Severe Weather, Key Laboratory of Atmospheric Chemistry of CMA, Chinese Academy of Meteorological Sciences, Beijing 100081, China

Abstract. This study proposes a method for estimating meridional and vertical air-mass transport in the stratosphere based on the mass conservation equation. The method does not require calculation of the velocity and flux, and avoids the uncertainty in vertical velocity estimates. Using satellite observations of hydrogen cyanide (HCN) concentrations in summer (June–September), the relative contributions of air mass originating from the troposphere and transporting into the deep stratosphere via the tropical tropopause and South Asia High (SAH) were estimated as 7.72 % and 14.55 %, while those of HCN were 7.17 % and 15.72 %, respectively. These results indicate that the air-mass contributions of the SAH are greater than those of the tropical troposphere, and that the SAH is the most important air-mass transport pathway from the troposphere to the deep stratosphere in summer. This suggests that the impact of pollutants from Asia on the stratosphere is greater than that reported by previous studies.

Yu Liu

 
Status: final response (author comments only)
Status: final response (author comments only)
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Yu Liu

Yu Liu

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Short summary
In order to aviod uncertainty in the estimatione of contribution of air-mass transport from the South Asia High (SAH) to the deep stratosphere, I proposed a new method. Results show that the SAH is the most important air-mass transport pathway from the troposphere to the deep stratosphere in summer. This suggests that the impact of pollutants from Asia on the stratosphere is greater than that reported by previous studies.
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