Preprints
https://doi.org/10.5194/acp-2021-647
https://doi.org/10.5194/acp-2021-647

  02 Sep 2021

02 Sep 2021

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

Enhanced upward motion through the troposphere over the tropical western Pacific and its implication to transport of trace gases from the troposphere to the stratosphere

Kai Qie1, Wuke Wang2, Wenshou Tian1, Rui Huang1, Mian Xu1, Tao Wang1, and Yifeng Peng1 Kai Qie et al.
  • 1College of Atmospheric Sciences, Lanzhou University, Lanzhou 730000, China
  • 2Department of Atmospheric Science, China University of Geosciences, Wuhan 430074, China

Abstract. The tropical western Pacific (TWP) is a preferential area of air uplifting from the surface to the upper troposphere. A significantly intensified upward motion through the troposphere over the TWP in the boreal wintertime (November to March of the next year) has been detected from 1958 to 2017 using the reanalysis datasets. Model simulations using the Whole Atmosphere Community Climate Model, version 4 (WACCM4) suggest that warming global sea surface temperatures (SSTs), particularly TWP SSTs, play a dominant role in the intensification of the upward motion by strengthening the Pacific Walker circulation and enhancing the deep convection over the TWP. Using CO as a tropospheric tracer, numeric simulations show that more CO could be elevated to the tropical tropopause layer (TTL) by the enhanced upward motion over the TWP and subsequently into the stratosphere by the strengthened Brewer-Dobson (BD) circulation which is also mainly caused by global SST warming. This implies that more tropospheric trace gases and aerosols may enter the stratosphere through the TWP region and affect the stratospheric chemistry and climate.

Kai Qie et al.

Status: open (until 14 Oct 2021)

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

Kai Qie et al.

Kai Qie et al.

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Short summary
We identify a significantly intensified upward motion over the tropical western Pacific (TWP) and an enhanced tropical upwelling in boreal winter during 1958–2017 due to the warming of global sea surface temperatures (SSTs). Our results suggest that more tropospheric trace gases over the TWP could be elevated to the lower stratosphere, which implies that the emission from the maritime continent plays a more important role in the stratospheric processes and the global climate.
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