Enhancements of hydroperoxides and formaldehyde in biomass burning impacted air and their effect on atmospheric oxidant cycles

Meehye Lee, Brian G. Heikes, Daniel J. Jacob

Research output: Contribution to journalArticle

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Abstract

Hydrogen peroxide, organic hydroperoxide species and formaldehyde were measured in the troposphere over the South Atlantic, Brazil and southern Africa during the NASA Global Tropospheric Experiment (GTE) Transport and Atmospheric Chemistry Near the Equator-Atlantic (TRACE-A) experiment, an investigation into the cause of an observed seasonal ozone maximum in this region. H2O2 and CH2O concentrations were extremely high, up to 14 and 5 ppbv, respectively, and are the result of direct production in fire plumes as well as secondary photochemical production in the atmosphere. Enhanced hydroperoxide and formaldehyde concentrations have a significant effect in both odd-hydrogen and odd-oxygen cycles in the troposphere. The odd-hydrogen radical production from hydroperoxide and formaldehyde photolysis exceeded that from ozone photolysis at high altitudes. At low altitudes where air was impacted by biomass burning the contribution of these species to odd-hydrogen radical production was comparable to that of O(1D). The fraction of radical production due to H2O2 and CH2O photolysis linearly increased with their concentrations. Odd-hydrogen radical production from hydroperoxides is ~30% of the total. These species also react with OH and cycle odd-hydrogen from OH to HO2 and CH3O2 radicals. In and near biomass burning plumes, more hydroperoxide and formaldehyde reacted iwth OH than was photolyzed, and HO2 radical production from H2O2 and CH2O oxidation was also important. Hydroperoxide and formaldehyde from fires together with nitric oxide initiate odd-oxygen production and contribute to new O3 formation. The greatest destruction of odd-oxygen in continental outflows leads to additional photochemical enhancement of the hydroperoxide. Therefore enhanced hydroperoxide and formaldehyde from biomass burning increases the oxidizing capacity of the atmosphere near fires and their high concentrations downwind reflect the stimulated chemistry.

Original languageEnglish
Pages (from-to)13201-13212
Number of pages12
JournalJournal of Geophysical Research D: Atmospheres
Volume103
Issue numberD11
Publication statusPublished - 1998 Jun 20
Externally publishedYes

Fingerprint

biomass burning
formaldehyde
Oxidants
oxidant
Hydrogen Peroxide
Formaldehyde
Biomass
cycles
hydrogen
augmentation
air
photolysis
Air
Hydrogen
Photolysis
oxygen
troposphere
Fires
Troposphere
ozone

ASJC Scopus subject areas

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

Cite this

Enhancements of hydroperoxides and formaldehyde in biomass burning impacted air and their effect on atmospheric oxidant cycles. / Lee, Meehye; Heikes, Brian G.; Jacob, Daniel J.

In: Journal of Geophysical Research D: Atmospheres, Vol. 103, No. D11, 20.06.1998, p. 13201-13212.

Research output: Contribution to journalArticle

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