Simulation of impact from stratospheric ozone on global tropospheric ozone distribution with a chemistry transport model: A case study during the 1990–1991 period

Kuo Ying Wang, Wen Shung Kau

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Abstract

In this work we examine the effect of ozone (O3) from the stratosphere on the O3 levels in the troposphere. The tropopause is defined according to the potential vorticity (PV) and potential temperature distribution. Annual simulations were performed with and without stratospheric O3 in the model to access the impact of stratospheric O3 on tropospheric O3 distribution. Our results show that surface O3 over the tropical marine boundary layer is dominated by in-situ photochemistry in the troposphere. The maintenance of the inter-hemispheric asymmetry in ozone over the extra-tropical marine boundary layer is dominated by the transport of O3 from the stratosphere. Comparisons between the model and the surface measurements show that the model without stratospheric O3 exhibits a hemispheric summer maximum, emphasizing the contributions of transport of O3 and O3 producing precursors from continental regions during the summer months, whilst no clear spring O3 maximum is found. About 50%–80% of O3 in the lower troposphere over the northern hemisphere mid-latitudes are photochemically produced during the northern hemisphere summer. About 20%–40% is due to tropospheric photochemistry in the lower troposphere during the northern hemisphere spring. We conclude that O3 transported from the stratosphere is the dominating factor for the spring O3 maximum over the extra-tropical latitudes, while the photochemical ozone production is the dominating factor for O3 over the tropical marine boundary layer environments and over the land surface emission areas.

Original languageEnglish
Pages (from-to)137-155
Number of pages19
JournalAsia-Pacific Journal of Atmospheric Sciences
Volume51
Issue number2
DOIs
StatePublished - 5 May 2015

Keywords

  • chemistry transport model
  • inter-hemispheric asymmetry
  • Ozone
  • spring ozone maximum
  • stratosphere

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