On the origin of tropospheric ozone and NOx over the tropical South Pacific

Martin G. Schultz, Daniel J. Jacob, Yuhang Wang, Jennifer A. Logan, Elliot L Atlas, Donald R. Blake, Nicola J. Blake, John D. Bradshaw, Edward V. Browell, Marta A. Fenn, Frank Flocke, Gerald L. Gregory, Brian G. Heikes, Glen W. Sachse, Scott T. Sandholm, Richard E. Shetter, Hanwant B. Singh, R. W. Talbot

Research output: Contribution to journalArticle

118 Citations (Scopus)

Abstract

The budgets of ozone and nitrogen oxides (NOx = NO + NO2) in the tropical South Pacific troposphere are analyzed by photochemical point modeling of aircraft observations at 0-12 km altitude from the Pacific Exploratory Mission-Tropics A campaign flown in September-October 1996. The model reproduces the observed NO2/NO concentration ratio to within 30% and has similar success in simulating observed concentrations of peroxides (H2O2, CH3OOH), lending confidence in its use to investigate ozone chemistry. It is found that chemical production of ozone balances only half of chemical loss in the tropospheric column over the tropical South Pacific. The net loss is 1.8 x 1011 molecules cm-2 s-1. The missing source of ozone is matched by westerly transport of continental pollution into the region. Independent analysis of the regional ozone budget with a global three-dimensional model corroborates the results from the point model and reveals the importance of biomass burning emissions in South America and Africa for the ozone budget over the tropical South Pacific. In this model, biomass burning increases average ozone concentrations by 7-8 ppbv throughout the troposphere. The NOx responsible for ozone production within the South Pacific troposphere below 4 km can be largely explained by decomposition of peroxyacetylnitrate (PAN) transported into the region with biomass burning pollution at higher altitudes.

Original languageEnglish (US)
Article number98JD02309
Pages (from-to)5829-5843
Number of pages15
JournalJournal of Geophysical Research C: Oceans
Volume104
Issue numberD5
StatePublished - Mar 20 1999
Externally publishedYes

Fingerprint

Ozone
ozone
biomass burning
Troposphere
troposphere
budgets
Biomass
pollution
Pollution
observation aircraft
Nitrogen Oxides
Tropics
nitrogen oxides
Republic of South Africa
tropospheric ozone
Peroxides
peroxides
three dimensional models
high altitude
tropical regions

ASJC Scopus subject areas

  • Geochemistry and Petrology
  • Geophysics
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science
  • Atmospheric Science
  • Astronomy and Astrophysics
  • Oceanography

Cite this

Schultz, M. G., Jacob, D. J., Wang, Y., Logan, J. A., Atlas, E. L., Blake, D. R., ... Talbot, R. W. (1999). On the origin of tropospheric ozone and NOx over the tropical South Pacific. Journal of Geophysical Research C: Oceans, 104(D5), 5829-5843. [98JD02309].

On the origin of tropospheric ozone and NOx over the tropical South Pacific. / Schultz, Martin G.; Jacob, Daniel J.; Wang, Yuhang; Logan, Jennifer A.; Atlas, Elliot L; Blake, Donald R.; Blake, Nicola J.; Bradshaw, John D.; Browell, Edward V.; Fenn, Marta A.; Flocke, Frank; Gregory, Gerald L.; Heikes, Brian G.; Sachse, Glen W.; Sandholm, Scott T.; Shetter, Richard E.; Singh, Hanwant B.; Talbot, R. W.

In: Journal of Geophysical Research C: Oceans, Vol. 104, No. D5, 98JD02309, 20.03.1999, p. 5829-5843.

Research output: Contribution to journalArticle

Schultz, MG, Jacob, DJ, Wang, Y, Logan, JA, Atlas, EL, Blake, DR, Blake, NJ, Bradshaw, JD, Browell, EV, Fenn, MA, Flocke, F, Gregory, GL, Heikes, BG, Sachse, GW, Sandholm, ST, Shetter, RE, Singh, HB & Talbot, RW 1999, 'On the origin of tropospheric ozone and NOx over the tropical South Pacific', Journal of Geophysical Research C: Oceans, vol. 104, no. D5, 98JD02309, pp. 5829-5843.
Schultz MG, Jacob DJ, Wang Y, Logan JA, Atlas EL, Blake DR et al. On the origin of tropospheric ozone and NOx over the tropical South Pacific. Journal of Geophysical Research C: Oceans. 1999 Mar 20;104(D5):5829-5843. 98JD02309.
Schultz, Martin G. ; Jacob, Daniel J. ; Wang, Yuhang ; Logan, Jennifer A. ; Atlas, Elliot L ; Blake, Donald R. ; Blake, Nicola J. ; Bradshaw, John D. ; Browell, Edward V. ; Fenn, Marta A. ; Flocke, Frank ; Gregory, Gerald L. ; Heikes, Brian G. ; Sachse, Glen W. ; Sandholm, Scott T. ; Shetter, Richard E. ; Singh, Hanwant B. ; Talbot, R. W. / On the origin of tropospheric ozone and NOx over the tropical South Pacific. In: Journal of Geophysical Research C: Oceans. 1999 ; Vol. 104, No. D5. pp. 5829-5843.
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