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

R. D. Diab, Anne Mee Thompson, M. Zunckel, G. J.R. Coetzee, J. Combrink, G. E. Bodeker, J. Fishman, F. Sokolic, D. P. McNamara, C. B. Archer, D. Nganga

Research output: Contribution to journalArticle

47 Citations (Scopus)

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.

Original languageEnglish (US)
Pages (from-to)23823-23833
Number of pages11
JournalJournal of Geophysical Research Atmospheres
Volume101
Issue number19
StatePublished - Oct 30 1996

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Ozone
Southern Africa
ozone
oceans
Congo (Brazzaville)
Ascension
biomass burning
ocean
troposphere
Biomass
Troposphere
stations
ozonesonde
biomass
dry season
vertical distribution
ozonesondes
stratification
boundary layer
sounding

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

Cite this

Diab, R. D., Thompson, A. M., Zunckel, M., Coetzee, G. J. R., Combrink, J., Bodeker, G. E., ... Nganga, D. (1996). Vertical ozone distribution over southern Africa and adjacent oceans during SAFARI-92. Journal of Geophysical Research Atmospheres, 101(19), 23823-23833.
Diab, R. D. ; Thompson, Anne Mee ; Zunckel, M. ; Coetzee, G. J.R. ; Combrink, J. ; Bodeker, G. E. ; Fishman, J. ; Sokolic, F. ; McNamara, D. P. ; Archer, C. B. ; Nganga, D. / Vertical ozone distribution over southern Africa and adjacent oceans during SAFARI-92. In: Journal of Geophysical Research Atmospheres. 1996 ; Vol. 101, No. 19. pp. 23823-23833.
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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.",
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Diab, RD, Thompson, AM, Zunckel, M, Coetzee, GJR, Combrink, J, Bodeker, GE, Fishman, J, Sokolic, F, McNamara, DP, Archer, CB & Nganga, D 1996, 'Vertical ozone distribution over southern Africa and adjacent oceans during SAFARI-92', Journal of Geophysical Research Atmospheres, vol. 101, no. 19, pp. 23823-23833.

Vertical ozone distribution over southern Africa and adjacent oceans during SAFARI-92. / Diab, R. D.; Thompson, Anne Mee; Zunckel, M.; Coetzee, G. J.R.; Combrink, J.; Bodeker, G. E.; Fishman, J.; Sokolic, F.; McNamara, D. P.; Archer, C. B.; Nganga, D.

In: Journal of Geophysical Research Atmospheres, Vol. 101, No. 19, 30.10.1996, p. 23823-23833.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Vertical ozone distribution over southern Africa and adjacent oceans during SAFARI-92

AU - Diab, R. D.

AU - Thompson, Anne Mee

AU - Zunckel, M.

AU - Coetzee, G. J.R.

AU - Combrink, J.

AU - Bodeker, G. E.

AU - Fishman, J.

AU - Sokolic, F.

AU - McNamara, D. P.

AU - Archer, C. B.

AU - Nganga, D.

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N2 - 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.

AB - 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.

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Diab RD, Thompson AM, Zunckel M, Coetzee GJR, Combrink J, Bodeker GE et al. Vertical ozone distribution over southern Africa and adjacent oceans during SAFARI-92. Journal of Geophysical Research Atmospheres. 1996 Oct 30;101(19):23823-23833.