Ozone-rich transients in the upper equatorial atlantic troposphere

Karsten Suhre, J. P. Gammas, P. Nedelec, R. Rosset, A. Marenco, H. G J Smitt

Research output: Contribution to journalArticle

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Abstract

High concentrations of ozone are found in the Earth's stratosphere, but strong stratification suppresses efficient exchange of this ozone-rich air with the underlying troposphere. Upward transport of tropospheric trace constituents occurs mainly through equatorial deep convective systems. In contrast, significant downward transport of ozone-rich stratospheric air is thought to take place only outside the tropics by exchange processes in upper-level fronts associated with strong distortions of the tropopause. Ozone within the tropical troposphere is assumed to originate predominantly from ground-based emissions of ozone precursors, particularly from biomass burning, rather than from a stratospheric source. Recent measurements of ozone in the upper troposphere in convective regions over the Pacific Ocean indeed reveal near-zero concentrations. Here we present sharply contrasting observations: ozone-rich (100-500 parts per billion by volume) transients were frequently encountered by specially equipped commercial aircraft at a cruising altitude of 10-12 km (in the upper troposphere) in the vicinity of strong convective activity over the equatorial Atlantic Ocean. This strongly suggests that the input of stratospheric ozone into the troposphere can take place in the tropics. We suggest that this transport occurs either by direct downward movement of air masses or by quasi-isentropic transport from the extratropical stratosphere.

Original languageEnglish
Pages (from-to)661-663
Number of pages3
JournalNature
Volume388
Issue number6643
DOIs
Publication statusPublished - 1997
Externally publishedYes

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Ozone
Stratospheric Ozone
Air Movements
Air
Atlantic Ocean
Pacific Ocean
Aircraft
Biomass

ASJC Scopus subject areas

  • General

Cite this

Suhre, K., Gammas, J. P., Nedelec, P., Rosset, R., Marenco, A., & Smitt, H. G. J. (1997). Ozone-rich transients in the upper equatorial atlantic troposphere. Nature, 388(6643), 661-663. https://doi.org/10.1038/41749

Ozone-rich transients in the upper equatorial atlantic troposphere. / Suhre, Karsten; Gammas, J. P.; Nedelec, P.; Rosset, R.; Marenco, A.; Smitt, H. G J.

In: Nature, Vol. 388, No. 6643, 1997, p. 661-663.

Research output: Contribution to journalArticle

Suhre, K, Gammas, JP, Nedelec, P, Rosset, R, Marenco, A & Smitt, HGJ 1997, 'Ozone-rich transients in the upper equatorial atlantic troposphere', Nature, vol. 388, no. 6643, pp. 661-663. https://doi.org/10.1038/41749
Suhre K, Gammas JP, Nedelec P, Rosset R, Marenco A, Smitt HGJ. Ozone-rich transients in the upper equatorial atlantic troposphere. Nature. 1997;388(6643):661-663. https://doi.org/10.1038/41749
Suhre, Karsten ; Gammas, J. P. ; Nedelec, P. ; Rosset, R. ; Marenco, A. ; Smitt, H. G J. / Ozone-rich transients in the upper equatorial atlantic troposphere. In: Nature. 1997 ; Vol. 388, No. 6643. pp. 661-663.
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