Ozone in the Pacific tropical troposphere from ozonesonde observations

Samuel J. Oltmans, Bryan J. Johnson, Joyce M. Harris, Holger Vömel, Anne M. Thompson, Kanatathu Koshy, Patrick Simon, Richard J. Bendura, Jennifer A. Logan, Fumio Hasebe, Masato Shiotani, Volker W.J.H. Kirchhoff, Matakite Maata, Gopal Sami, Ansari Samad, Jioji Tabuadravu, Humberto Enriquez, Mario Agama, Jaime Cornejo, Francisco Paredes

Research output: Contribution to journalArticle

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Abstract

Ozone vertical profile measurements obtained from ozonesondes flown at Fiji, Samoa, Tahiti, and the Galapagos are used to characterize ozone in the troposphere over the tropical Pacific. There is a significant seasonal variation at each of these sites. At sites in both the eastern and western Pacific, ozone mixing ratios are greatest at almost all levels in the troposphere during the September-November season and smallest during March-May. The vertical profile has a relative maximum at all of the sites in the midtroposphere throughout the year (the largest amounts are usually found near the tropopause). This maximum is particularly pronounced during the September-November season. On average, throughout the troposphere, the Galapagos has larger ozone amounts than the western Pacific sites. A trajectory climatology is used to identify the major flow regimes that are associated with the characteristic ozone behavior at various altitudes and seasons. The enhanced ozone seen in the midtroposphere during September-November is associated with flow from the continents. In the western Pacific this flow is usually from southern Africa (although 10-day trajectories do not always reach the continent) but also may come from Australia and Indonesia. In the Galapagos the ozone peak in the midtroposphere is seen in flow from the South American continent and particularly from northern Brazil. High ozone concentrations within potential source regions and flow characteristics associated with the ozone mixing ratio peaks seen in both the western and eastern Pacific suggest that these enhanced ozone mixing ratios result from biomass burning. In the upper troposphere, low ozone amounts are seen with flow that originates in the convective western Pacific.

Original languageEnglish (US)
Article number2000JD900834
Pages (from-to)32503-32525
Number of pages23
JournalJournal of Geophysical Research Atmospheres
Volume106
Issue numberD23
DOIs
StatePublished - Dec 16 2001

Fingerprint

ozonesondes
ozonesonde
Troposphere
Ozone
troposphere
ozone
continents
mixing ratios
mixing ratio
vertical profile
trajectories
Samoa
trajectory
Trajectories
Tahiti
Climatology
Indonesia
biomass burning
tropopause
Fiji

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

Oltmans, S. J., Johnson, B. J., Harris, J. M., Vömel, H., Thompson, A. M., Koshy, K., ... Paredes, F. (2001). Ozone in the Pacific tropical troposphere from ozonesonde observations. Journal of Geophysical Research Atmospheres, 106(D23), 32503-32525. [2000JD900834]. https://doi.org/10.1029/2000JD900834
Oltmans, Samuel J. ; Johnson, Bryan J. ; Harris, Joyce M. ; Vömel, Holger ; Thompson, Anne M. ; Koshy, Kanatathu ; Simon, Patrick ; Bendura, Richard J. ; Logan, Jennifer A. ; Hasebe, Fumio ; Shiotani, Masato ; Kirchhoff, Volker W.J.H. ; Maata, Matakite ; Sami, Gopal ; Samad, Ansari ; Tabuadravu, Jioji ; Enriquez, Humberto ; Agama, Mario ; Cornejo, Jaime ; Paredes, Francisco. / Ozone in the Pacific tropical troposphere from ozonesonde observations. In: Journal of Geophysical Research Atmospheres. 2001 ; Vol. 106, No. D23. pp. 32503-32525.
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abstract = "Ozone vertical profile measurements obtained from ozonesondes flown at Fiji, Samoa, Tahiti, and the Galapagos are used to characterize ozone in the troposphere over the tropical Pacific. There is a significant seasonal variation at each of these sites. At sites in both the eastern and western Pacific, ozone mixing ratios are greatest at almost all levels in the troposphere during the September-November season and smallest during March-May. The vertical profile has a relative maximum at all of the sites in the midtroposphere throughout the year (the largest amounts are usually found near the tropopause). This maximum is particularly pronounced during the September-November season. On average, throughout the troposphere, the Galapagos has larger ozone amounts than the western Pacific sites. A trajectory climatology is used to identify the major flow regimes that are associated with the characteristic ozone behavior at various altitudes and seasons. The enhanced ozone seen in the midtroposphere during September-November is associated with flow from the continents. In the western Pacific this flow is usually from southern Africa (although 10-day trajectories do not always reach the continent) but also may come from Australia and Indonesia. In the Galapagos the ozone peak in the midtroposphere is seen in flow from the South American continent and particularly from northern Brazil. High ozone concentrations within potential source regions and flow characteristics associated with the ozone mixing ratio peaks seen in both the western and eastern Pacific suggest that these enhanced ozone mixing ratios result from biomass burning. In the upper troposphere, low ozone amounts are seen with flow that originates in the convective western Pacific.",
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Oltmans, SJ, Johnson, BJ, Harris, JM, Vömel, H, Thompson, AM, Koshy, K, Simon, P, Bendura, RJ, Logan, JA, Hasebe, F, Shiotani, M, Kirchhoff, VWJH, Maata, M, Sami, G, Samad, A, Tabuadravu, J, Enriquez, H, Agama, M, Cornejo, J & Paredes, F 2001, 'Ozone in the Pacific tropical troposphere from ozonesonde observations', Journal of Geophysical Research Atmospheres, vol. 106, no. D23, 2000JD900834, pp. 32503-32525. https://doi.org/10.1029/2000JD900834

Ozone in the Pacific tropical troposphere from ozonesonde observations. / Oltmans, Samuel J.; Johnson, Bryan J.; Harris, Joyce M.; Vömel, Holger; Thompson, Anne M.; Koshy, Kanatathu; Simon, Patrick; Bendura, Richard J.; Logan, Jennifer A.; Hasebe, Fumio; Shiotani, Masato; Kirchhoff, Volker W.J.H.; Maata, Matakite; Sami, Gopal; Samad, Ansari; Tabuadravu, Jioji; Enriquez, Humberto; Agama, Mario; Cornejo, Jaime; Paredes, Francisco.

In: Journal of Geophysical Research Atmospheres, Vol. 106, No. D23, 2000JD900834, 16.12.2001, p. 32503-32525.

Research output: Contribution to journalArticle

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AU - Oltmans, Samuel J.

AU - Johnson, Bryan J.

AU - Harris, Joyce M.

AU - Vömel, Holger

AU - Thompson, Anne M.

AU - Koshy, Kanatathu

AU - Simon, Patrick

AU - Bendura, Richard J.

AU - Logan, Jennifer A.

AU - Hasebe, Fumio

AU - Shiotani, Masato

AU - Kirchhoff, Volker W.J.H.

AU - Maata, Matakite

AU - Sami, Gopal

AU - Samad, Ansari

AU - Tabuadravu, Jioji

AU - Enriquez, Humberto

AU - Agama, Mario

AU - Cornejo, Jaime

AU - Paredes, Francisco

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N2 - Ozone vertical profile measurements obtained from ozonesondes flown at Fiji, Samoa, Tahiti, and the Galapagos are used to characterize ozone in the troposphere over the tropical Pacific. There is a significant seasonal variation at each of these sites. At sites in both the eastern and western Pacific, ozone mixing ratios are greatest at almost all levels in the troposphere during the September-November season and smallest during March-May. The vertical profile has a relative maximum at all of the sites in the midtroposphere throughout the year (the largest amounts are usually found near the tropopause). This maximum is particularly pronounced during the September-November season. On average, throughout the troposphere, the Galapagos has larger ozone amounts than the western Pacific sites. A trajectory climatology is used to identify the major flow regimes that are associated with the characteristic ozone behavior at various altitudes and seasons. The enhanced ozone seen in the midtroposphere during September-November is associated with flow from the continents. In the western Pacific this flow is usually from southern Africa (although 10-day trajectories do not always reach the continent) but also may come from Australia and Indonesia. In the Galapagos the ozone peak in the midtroposphere is seen in flow from the South American continent and particularly from northern Brazil. High ozone concentrations within potential source regions and flow characteristics associated with the ozone mixing ratio peaks seen in both the western and eastern Pacific suggest that these enhanced ozone mixing ratios result from biomass burning. In the upper troposphere, low ozone amounts are seen with flow that originates in the convective western Pacific.

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Oltmans SJ, Johnson BJ, Harris JM, Vömel H, Thompson AM, Koshy K et al. Ozone in the Pacific tropical troposphere from ozonesonde observations. Journal of Geophysical Research Atmospheres. 2001 Dec 16;106(D23):32503-32525. 2000JD900834. https://doi.org/10.1029/2000JD900834