Origins of tropospheric ozone interannual variation over Réunion: A model investigation

Junhua Liu, Jose M. Rodriguez, Anne M. Thompson, Jennifer A. Logan, Anne R. Douglass, Mark A. Olsen, Stephen D. Steenrod, Françoise Posny

Research output: Contribution to journalArticle

11 Scopus citations

Abstract

Observations from long-term ozonesonde measurements show robust variations and trends in the evolution of ozone in the middle and upper troposphere over Réunion Island (21.1°S, 55.5°E) in June–August. Here we examine possible causes of the observed ozone variation at Réunion Island using hindcast simulations by the stratosphere-troposphere Global Modeling Initiative chemical transport model for 1992–2014, driven by assimilated Modern-Era Retrospective Analysis for Research and Applications meteorological fields. Réunion Island is at the edge of the subtropical jet, a region of strong stratospheric-tropospheric exchange. Our analysis implies that the large interannual variation (IAV) of upper tropospheric ozone over Réunion is driven by the large IAV of the stratospheric influence. The IAV of the large-scale, quasi-horizontal wind patterns also contributes to the IAV of ozone in the upper troposphere. Comparison to a simulation with constant emissions indicates that increasing emissions do not lead to the maximum trend in the middle and upper troposphere over Réunion during austral winter implied by the sonde data. The effects of increasing emission over southern Africa are limited to the lower troposphere near the surface in August–September.

Original languageEnglish (US)
Pages (from-to)521-537
Number of pages17
JournalJournal of Geophysical Research
Volume121
Issue number1
DOIs
StatePublished - Jan 16 2016

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Forestry
  • Oceanography
  • Aquatic Science
  • Ecology
  • Water Science and Technology
  • Soil Science
  • Geochemistry and Petrology
  • Earth-Surface Processes
  • Atmospheric Science
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science
  • Palaeontology

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    Liu, J., Rodriguez, J. M., Thompson, A. M., Logan, J. A., Douglass, A. R., Olsen, M. A., Steenrod, S. D., & Posny, F. (2016). Origins of tropospheric ozone interannual variation over Réunion: A model investigation. Journal of Geophysical Research, 121(1), 521-537. https://doi.org/10.1002/2015JD023981