Convective lofting links Indian Ocean air pollution to paradoxical South Atlantic ozone maxima

R. B. Chatfield, H. Guan, A. M. Thompson, J. C. Witte

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25 Scopus citations


We describe a broad resolution of the "Atlantic Parado" concerning the seasonal and geographic distribution of tropical tropospheric ozone. We highlight periods of significant maximum tropospheric O3 for Jan.-April, 1999, exploiting satellite estimates and SHADOZ (Southern Hemisphere Additional Ozonesondes). Trajectory analyses connecting sondes and Total Tropospheric Ozone (TTO) maps suggest a complex influence from the Indian Ocean: beginning with mixed combustion sources, then low level transport, cumulonimbus venting, possible stratospheric input, and finally high-level transport to the west, with possible mixing over Africa. For the Jan.-March highest column-O3 periods in the Atlantic, distinct sounding peaks trace to specific NO sources, especially lightning, while in the same episodes, recurring every 20-50 days, more diffuse buildups of Indian-to-Atlantic pollution make important contributions.

Original languageEnglish (US)
Pages (from-to)L06103 1-5
JournalGeophysical Research Letters
Issue number6
StatePublished - Mar 28 2004

All Science Journal Classification (ASJC) codes

  • Geophysics
  • General Earth and Planetary Sciences


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