Atmospheric transport and photochemistry of ozone over central Southern Africa during the Southern Africa Fire-Atmosphere research initiative

P. D. Tyson, M. Garstang, Anne Mee Thompson, P. D'Abreton, R. D. Diab, E. V. Browell

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

Vertically integrated back and forward trajectories for the 300-200, 700-500 and surface-800 hPa levels are calculated using Pretoria as point of origin for the Southern Africa Fire-Atmo-sphere Research Initiative (SAFARI) period September-October 1992. The transport fields are then combined to show both horizontal and vertical transport of air to and from Pretoria at the different levels. Air transport patterns in the vertical are linked to the occurrence of absolutely stable layers which are also evident in the 16 ozonesonde profiles recorded at Pretoria during SAFARI. The coherence of the stratification based on dynamical and ozone analysis permits the use of mean ozone profiles with air volume fluxes to interpret the ozone in terms of photochemistry and transport within stable layers. Extensive recirculation across the meridional plane at Pretoria implies that advection of ozone is slow and that photochemistry is responsible for the observed vertical structure over central southern Africa in September and October 1992. Requisite ozone formation rates are supported by model analysis of ozone and ozone precursors measured from SAFARI and Transport and Atmospheric Research Chemistry near the Equator-Atlantic aircraft.

Original languageEnglish (US)
Pages (from-to)10623-10635
Number of pages13
JournalJournal of Geophysical Research Atmospheres
Volume102
Issue number9
StatePublished - May 20 1997

Fingerprint

photochemistry
Photochemical reactions
Ozone
Central Africa
atmospheric transport
Southern Africa
ozone
photochemical reactions
Fires
atmospheres
atmosphere
air transportation
Breguet 1150 aircraft
air
Air
ozonesondes
ozonesonde
aircraft
Advection
equators

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

Tyson, P. D., Garstang, M., Thompson, A. M., D'Abreton, P., Diab, R. D., & Browell, E. V. (1997). Atmospheric transport and photochemistry of ozone over central Southern Africa during the Southern Africa Fire-Atmosphere research initiative. Journal of Geophysical Research Atmospheres, 102(9), 10623-10635.
Tyson, P. D. ; Garstang, M. ; Thompson, Anne Mee ; D'Abreton, P. ; Diab, R. D. ; Browell, E. V. / Atmospheric transport and photochemistry of ozone over central Southern Africa during the Southern Africa Fire-Atmosphere research initiative. In: Journal of Geophysical Research Atmospheres. 1997 ; Vol. 102, No. 9. pp. 10623-10635.
@article{a433c57466824e77a93fe628808cd608,
title = "Atmospheric transport and photochemistry of ozone over central Southern Africa during the Southern Africa Fire-Atmosphere research initiative",
abstract = "Vertically integrated back and forward trajectories for the 300-200, 700-500 and surface-800 hPa levels are calculated using Pretoria as point of origin for the Southern Africa Fire-Atmo-sphere Research Initiative (SAFARI) period September-October 1992. The transport fields are then combined to show both horizontal and vertical transport of air to and from Pretoria at the different levels. Air transport patterns in the vertical are linked to the occurrence of absolutely stable layers which are also evident in the 16 ozonesonde profiles recorded at Pretoria during SAFARI. The coherence of the stratification based on dynamical and ozone analysis permits the use of mean ozone profiles with air volume fluxes to interpret the ozone in terms of photochemistry and transport within stable layers. Extensive recirculation across the meridional plane at Pretoria implies that advection of ozone is slow and that photochemistry is responsible for the observed vertical structure over central southern Africa in September and October 1992. Requisite ozone formation rates are supported by model analysis of ozone and ozone precursors measured from SAFARI and Transport and Atmospheric Research Chemistry near the Equator-Atlantic aircraft.",
author = "Tyson, {P. D.} and M. Garstang and Thompson, {Anne Mee} and P. D'Abreton and Diab, {R. D.} and Browell, {E. V.}",
year = "1997",
month = "5",
day = "20",
language = "English (US)",
volume = "102",
pages = "10623--10635",
journal = "Journal of Geophysical Research",
issn = "0148-0227",
publisher = "American Geophysical Union",
number = "9",

}

Atmospheric transport and photochemistry of ozone over central Southern Africa during the Southern Africa Fire-Atmosphere research initiative. / Tyson, P. D.; Garstang, M.; Thompson, Anne Mee; D'Abreton, P.; Diab, R. D.; Browell, E. V.

In: Journal of Geophysical Research Atmospheres, Vol. 102, No. 9, 20.05.1997, p. 10623-10635.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Atmospheric transport and photochemistry of ozone over central Southern Africa during the Southern Africa Fire-Atmosphere research initiative

AU - Tyson, P. D.

AU - Garstang, M.

AU - Thompson, Anne Mee

AU - D'Abreton, P.

AU - Diab, R. D.

AU - Browell, E. V.

PY - 1997/5/20

Y1 - 1997/5/20

N2 - Vertically integrated back and forward trajectories for the 300-200, 700-500 and surface-800 hPa levels are calculated using Pretoria as point of origin for the Southern Africa Fire-Atmo-sphere Research Initiative (SAFARI) period September-October 1992. The transport fields are then combined to show both horizontal and vertical transport of air to and from Pretoria at the different levels. Air transport patterns in the vertical are linked to the occurrence of absolutely stable layers which are also evident in the 16 ozonesonde profiles recorded at Pretoria during SAFARI. The coherence of the stratification based on dynamical and ozone analysis permits the use of mean ozone profiles with air volume fluxes to interpret the ozone in terms of photochemistry and transport within stable layers. Extensive recirculation across the meridional plane at Pretoria implies that advection of ozone is slow and that photochemistry is responsible for the observed vertical structure over central southern Africa in September and October 1992. Requisite ozone formation rates are supported by model analysis of ozone and ozone precursors measured from SAFARI and Transport and Atmospheric Research Chemistry near the Equator-Atlantic aircraft.

AB - Vertically integrated back and forward trajectories for the 300-200, 700-500 and surface-800 hPa levels are calculated using Pretoria as point of origin for the Southern Africa Fire-Atmo-sphere Research Initiative (SAFARI) period September-October 1992. The transport fields are then combined to show both horizontal and vertical transport of air to and from Pretoria at the different levels. Air transport patterns in the vertical are linked to the occurrence of absolutely stable layers which are also evident in the 16 ozonesonde profiles recorded at Pretoria during SAFARI. The coherence of the stratification based on dynamical and ozone analysis permits the use of mean ozone profiles with air volume fluxes to interpret the ozone in terms of photochemistry and transport within stable layers. Extensive recirculation across the meridional plane at Pretoria implies that advection of ozone is slow and that photochemistry is responsible for the observed vertical structure over central southern Africa in September and October 1992. Requisite ozone formation rates are supported by model analysis of ozone and ozone precursors measured from SAFARI and Transport and Atmospheric Research Chemistry near the Equator-Atlantic aircraft.

UR - http://www.scopus.com/inward/record.url?scp=0031417013&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0031417013&partnerID=8YFLogxK

M3 - Article

AN - SCOPUS:0031417013

VL - 102

SP - 10623

EP - 10635

JO - Journal of Geophysical Research

JF - Journal of Geophysical Research

SN - 0148-0227

IS - 9

ER -