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Science China Earth Sciences

, Volume 60, Issue 9, pp 1685–1693 | Cite as

Stratospheric entry point for upper-tropospheric air within the Asian summer monsoon anticyclone

  • QiuJun Fan
  • JianChun BianEmail author
  • Laura L. Pan
Research Paper

Abstract

The Asian summer monsoon (ASM) anticyclone isolates upper-tropospheric air within the interior of the anticyclone from the outside. Forward trajectory simulations in previous studies have shown that much of the air within the ASM anticyclone can be trapped for up to two or three weeks, not only laterally but also vertically. Here, we investigate the locations of exit points for upper-tropospheric air trapped within the ASM anticyclone, especially the preferred tropopause-crossing locations, using a 3-dimensional trajectory model. Forward trajectory calculations show two-thirds of the air crosses the tropopause at the southern part of the anticyclone via upward diabatic transport. Furthermore, some air crosses at northern and eastern parts via isentropic shedding, but air crosses rarely through the center of the anticyclone. However, calculations also show that many stratospheric parcels within the anticyclone are traceable from the upper-tropospheric anticyclone. This implies they cannot break through the tropopause directly overhead but instead enter the stratosphere via other entry points.

Keywords

Asian summer monsoon anticyclone Tropopause Stratosphere-troposphere exchange Trajectory simulation 

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Notes

Acknowledgements

This work was supported by the National Natural Science Foundation of China (Grant Nos. 91337214 & 41675040).

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Copyright information

© Science China Press and Springer-Verlag GmbH Germany 2017

Authors and Affiliations

  1. 1.Key Laboratory of Middle Atmosphere and Global Environment Observation, Institute of Atmospheric PhysicsChinese Academy of SciencesBeijingChina
  2. 2.College of Earth SciencesUniversity of Chinese Academy of SciencesBeijingChina
  3. 3.National Center for Atmospheric ResearchBoulderUSA

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