Tropospheric reactive odd nitrogen over the South Pacific in austral springtime

R. W. Talbot, J. E. Dibb, E. M. Scheuer, J. D. Bradshaw, S. T. Sandholm, H. B. Singh, D. R. Blake, N. J. Blake, Elliot L Atlas, F. Flocke

Research output: Contribution to journalArticle

37 Citations (Scopus)

Abstract

The distribution of reactive nitrogen species over the South Pacific during austral springtime appears to be dominated by biomass burning emissions and possibly lightning and stratospheric inputs. The absence of robust correlations of reactive nitrogen species with source-specific tracers (e.g., C2H2 [combustion], CH3Cl [biomass burning], C2Cl4 [industrial], 210Pb [continental], and 7Be [stratospheric]) suggests significant aging and processing of the sampled air parcels due to losses by surface deposition, OH attack, and dilution processes. Classification of the air parcels based on CO enhancements indicates that the greatest influence was found in plumes at 3-8 km altitude in the distributions of HNO3 and peroxyacetyl nitrate (PAN). Here mixing ratios of these species reached 600 parts per trillion by volume (pptv), values surprisingly large for a location several thousand kilometers removed from the nearest continental areas. The mixing ratio of total reactive nitrogen (the NOy sum), operationally defined in this paper as measured (NO + HNO3 + PAN + CH3ONO2 +C2H5ONO2) + modeled (NO2), had a median value of 285 pptv within these plumes compared with 120 pptv in nonplume air parcels. Particle NO3 - was not included in this analysis of the NOy sum due to its 10- to 15-min sampling time resolution, but, in general, it was <10% of the NOy sum. Comparison of the two air parcel classifications for NOx and alkyl nitrate distributions showed no perceivable plume influence, but recycling of reactive nitrogen may have masked this direct effect. In the marine boundary layer, the NOy sum averaged 50 pptv in both air parcel classifications, being somewhat isolated from the polluted conditions above it by the trade wind inversion. In this region, however, alkyl nitrates appear to have an important marine source where they comprise 20-80% of the NOy sum in equatorial and high-latitude regions over the South Pacific.

Original languageEnglish (US)
Article number1999JD901114
Pages (from-to)6681-6694
Number of pages14
JournalJournal of Geophysical Research C: Oceans
Volume105
Issue numberD5
StatePublished - Mar 16 2000
Externally publishedYes

Fingerprint

Nitrogen
nitrates
nitrogen
air
peroxyacetyl nitrate
plumes
Reactive Nitrogen Species
Air
biomass burning
Upper atmosphere
plume
mixing ratios
mixing ratio
Nitrates
Biomass
nitrate
trade wind
lightning
Lightning
Carbon Monoxide

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

Talbot, R. W., Dibb, J. E., Scheuer, E. M., Bradshaw, J. D., Sandholm, S. T., Singh, H. B., ... Flocke, F. (2000). Tropospheric reactive odd nitrogen over the South Pacific in austral springtime. Journal of Geophysical Research C: Oceans, 105(D5), 6681-6694. [1999JD901114].

Tropospheric reactive odd nitrogen over the South Pacific in austral springtime. / Talbot, R. W.; Dibb, J. E.; Scheuer, E. M.; Bradshaw, J. D.; Sandholm, S. T.; Singh, H. B.; Blake, D. R.; Blake, N. J.; Atlas, Elliot L; Flocke, F.

In: Journal of Geophysical Research C: Oceans, Vol. 105, No. D5, 1999JD901114, 16.03.2000, p. 6681-6694.

Research output: Contribution to journalArticle

Talbot, RW, Dibb, JE, Scheuer, EM, Bradshaw, JD, Sandholm, ST, Singh, HB, Blake, DR, Blake, NJ, Atlas, EL & Flocke, F 2000, 'Tropospheric reactive odd nitrogen over the South Pacific in austral springtime', Journal of Geophysical Research C: Oceans, vol. 105, no. D5, 1999JD901114, pp. 6681-6694.
Talbot RW, Dibb JE, Scheuer EM, Bradshaw JD, Sandholm ST, Singh HB et al. Tropospheric reactive odd nitrogen over the South Pacific in austral springtime. Journal of Geophysical Research C: Oceans. 2000 Mar 16;105(D5):6681-6694. 1999JD901114.
Talbot, R. W. ; Dibb, J. E. ; Scheuer, E. M. ; Bradshaw, J. D. ; Sandholm, S. T. ; Singh, H. B. ; Blake, D. R. ; Blake, N. J. ; Atlas, Elliot L ; Flocke, F. / Tropospheric reactive odd nitrogen over the South Pacific in austral springtime. In: Journal of Geophysical Research C: Oceans. 2000 ; Vol. 105, No. D5. pp. 6681-6694.
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abstract = "The distribution of reactive nitrogen species over the South Pacific during austral springtime appears to be dominated by biomass burning emissions and possibly lightning and stratospheric inputs. The absence of robust correlations of reactive nitrogen species with source-specific tracers (e.g., C2H2 [combustion], CH3Cl [biomass burning], C2Cl4 [industrial], 210Pb [continental], and 7Be [stratospheric]) suggests significant aging and processing of the sampled air parcels due to losses by surface deposition, OH attack, and dilution processes. Classification of the air parcels based on CO enhancements indicates that the greatest influence was found in plumes at 3-8 km altitude in the distributions of HNO3 and peroxyacetyl nitrate (PAN). Here mixing ratios of these species reached 600 parts per trillion by volume (pptv), values surprisingly large for a location several thousand kilometers removed from the nearest continental areas. The mixing ratio of total reactive nitrogen (the NOy sum), operationally defined in this paper as measured (NO + HNO3 + PAN + CH3ONO2 +C2H5ONO2) + modeled (NO2), had a median value of 285 pptv within these plumes compared with 120 pptv in nonplume air parcels. Particle NO3 - was not included in this analysis of the NOy sum due to its 10- to 15-min sampling time resolution, but, in general, it was <10{\%} of the NOy sum. Comparison of the two air parcel classifications for NOx and alkyl nitrate distributions showed no perceivable plume influence, but recycling of reactive nitrogen may have masked this direct effect. In the marine boundary layer, the NOy sum averaged 50 pptv in both air parcel classifications, being somewhat isolated from the polluted conditions above it by the trade wind inversion. In this region, however, alkyl nitrates appear to have an important marine source where they comprise 20-80{\%} of the NOy sum in equatorial and high-latitude regions over the South Pacific.",
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AU - Sandholm, S. T.

AU - Singh, H. B.

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AU - Atlas, Elliot L

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N2 - The distribution of reactive nitrogen species over the South Pacific during austral springtime appears to be dominated by biomass burning emissions and possibly lightning and stratospheric inputs. The absence of robust correlations of reactive nitrogen species with source-specific tracers (e.g., C2H2 [combustion], CH3Cl [biomass burning], C2Cl4 [industrial], 210Pb [continental], and 7Be [stratospheric]) suggests significant aging and processing of the sampled air parcels due to losses by surface deposition, OH attack, and dilution processes. Classification of the air parcels based on CO enhancements indicates that the greatest influence was found in plumes at 3-8 km altitude in the distributions of HNO3 and peroxyacetyl nitrate (PAN). Here mixing ratios of these species reached 600 parts per trillion by volume (pptv), values surprisingly large for a location several thousand kilometers removed from the nearest continental areas. The mixing ratio of total reactive nitrogen (the NOy sum), operationally defined in this paper as measured (NO + HNO3 + PAN + CH3ONO2 +C2H5ONO2) + modeled (NO2), had a median value of 285 pptv within these plumes compared with 120 pptv in nonplume air parcels. Particle NO3 - was not included in this analysis of the NOy sum due to its 10- to 15-min sampling time resolution, but, in general, it was <10% of the NOy sum. Comparison of the two air parcel classifications for NOx and alkyl nitrate distributions showed no perceivable plume influence, but recycling of reactive nitrogen may have masked this direct effect. In the marine boundary layer, the NOy sum averaged 50 pptv in both air parcel classifications, being somewhat isolated from the polluted conditions above it by the trade wind inversion. In this region, however, alkyl nitrates appear to have an important marine source where they comprise 20-80% of the NOy sum in equatorial and high-latitude regions over the South Pacific.

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