Vertical ozone distribution over southern Africa and adjacent oceans during SAFARI-92

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Vertical_ozone_distribution_over_souther.pdf (1.07 MB)

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https://onlinelibrary.wiley.com/doi/abs/10.1029/96JD01267

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https://doi.org/10.1029/96JD01267
 http://hdl.handle.net/11603/35157

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UMBC GESTAR II

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Author/Creator ORCID

https://orcid.org/0000-0002-7829-0920

Date

1996-10-01

Type of Work

journal articles
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Program

Citation of Original Publication

Diab, R. D., A. M. Thompson, M. Zunckel, G. J. R. Coetzee, J. Combrink, G. E. Bodeker, J. Fishman, et al. “Vertical Ozone Distribution over Southern Africa and Adjacent Oceans during SAFARI-92.” Journal of Geophysical Research: Atmospheres 101, no. D19 (1996): 23823–33. https://doi.org/10.1029/96JD01267.

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This work was written as part of one of the author's official duties as an Employee of the United States Government and is therefore a work of the United States Government. In accordance with 17 U.S.C. 105, no copyright protection is available for such works under U.S. Law.
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Abstract

A set of four ozonesonde stations located at Ascension Island, Brazzaville, Okaukuejo, and Irene, operational during the TRACE A and SAFARI-92 experiments has provided an opportunity to investigate the vertical distribution of ozone over southern Africa and adjacent oceans. All stations display a springtime maximum in tropospheric ozone. Enhanced tropospheric ozone, which occurs between June and September at Brazzaville and between July and October at Ascension Island, is linked to dry season biomass burning. The influence of tropical biomass burning is delayed until September at Okaukuejo when a sharp increase in tropospheric ozone is experienced. The biomass burning influence at Irene is less because of its more southerly location. A general tropospheric enhancement is observed at all stations. It is manifest as an enriched layer in the upper troposphere at Okaukuejo (9–12 km) and Brazzaville (11–14 km) and in the lower troposphere (2–8 km) at Ascension Island. At Ascension Island lower tropospheric ozone values are about 20 parts per billion by volume greater than elsewhere and the tropospheric component here accounts for about 18% of the total column ozone. A series of tethersonde soundings conducted at hourly intervals at Okaukuejo revealed ozone to be well mixed in the lower boundary layer during the day, but to display marked vertical stratification at night.