Aircraft measurements of the latitudinal, vertical, and seasonal variations of NMHCs, methyl nitrate, methyl halides, and DMS during the First Aerosol Characterization Experiment (ACE 1)

Nicola J. Blake, Donald R. Blake, Oliver W. Wingenter, Barkley C. Sive, Chang Hee Kang, Donald C. Thornton, Alan R. Bandy, Elliot L Atlas, Frank Flocke, Joyce M. Harris, F. Sherwood Rowland

Research output: Contribution to journalArticle

78 Citations (Scopus)

Abstract

Canister sampling for the determination of atmospheric mixing ratios of nonmethane hydrocarbons (NMHCs), selected halocarbons, and methyl nitrate was conducted aboard the National Center for Atmospheric Research (NCAR) C-130 aircraft over the Pacific and Southern Oceans as part of the First Aerosol Characterization Experiment (ACE 1) during November and December 1995. A latitudinal profile, flown from 76°N to 60°S, revealed latitudinal gradients for most trace gases. NMHC and halocarbon gases with predominantly anthropogenic sources, including ethane, ethyne, and tetrachloroethene, exhibited significantly higher mixing ratios in the northern hemisphere at all altitudes. Methyl chloride exhibited its lowest mixing ratios at the highest northern hemisphere latitudes, and the distributions of methyl nitrate and methyl iodide were consistent with tropical and subtropical oceanic sources. Layers containing continental air characteristic of aged biomass burning emissions were observed above about 3 km over the remote southern Pacific and near New Zealand between approximately 19°S and 43°S. These plumes originated from the west, possibly from fires in southern Africa. The month-long intensive investigation of the clean marine southern midlatitude troposphere south of Australia revealed decreases in the mixing ratios of ethane, ethyne, propane, and tetrachloroethene, consistent with their seasonal mixing ratio cycle. By contrast, increases in the average marine boundary layer concentrations of methyl iodide, methyl nitrate, and dimethyl sulfide (DMS) were observed as the season progressed to summer conditions. These increases were most appreciable in the region south of 44°S over Southern Ocean waters characterized as subantarctic and polar, indicating a seasonal increase in oceanic productivity for these gases.

Original languageEnglish (US)
Article number1999JD900238
Pages (from-to)21803-21817
Number of pages15
JournalJournal of Geophysical Research C: Oceans
Volume104
Issue numberD17
StatePublished - Sep 20 1999
Externally publishedYes

Fingerprint

methyl nitrate
ACE 1
nonmethane hydrocarbon
halide
airborne survey
annual variations
mixing ratios
Hydrocarbons
Aerosols
mixing ratio
aircraft
halides
sulfides
aerosols
seasonal variation
hydrocarbons
Aircraft
sulfide
aerosol
nitrate

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

Blake, N. J., Blake, D. R., Wingenter, O. W., Sive, B. C., Kang, C. H., Thornton, D. C., ... Rowland, F. S. (1999). Aircraft measurements of the latitudinal, vertical, and seasonal variations of NMHCs, methyl nitrate, methyl halides, and DMS during the First Aerosol Characterization Experiment (ACE 1). Journal of Geophysical Research C: Oceans, 104(D17), 21803-21817. [1999JD900238].

Aircraft measurements of the latitudinal, vertical, and seasonal variations of NMHCs, methyl nitrate, methyl halides, and DMS during the First Aerosol Characterization Experiment (ACE 1). / Blake, Nicola J.; Blake, Donald R.; Wingenter, Oliver W.; Sive, Barkley C.; Kang, Chang Hee; Thornton, Donald C.; Bandy, Alan R.; Atlas, Elliot L; Flocke, Frank; Harris, Joyce M.; Rowland, F. Sherwood.

In: Journal of Geophysical Research C: Oceans, Vol. 104, No. D17, 1999JD900238, 20.09.1999, p. 21803-21817.

Research output: Contribution to journalArticle

Blake, NJ, Blake, DR, Wingenter, OW, Sive, BC, Kang, CH, Thornton, DC, Bandy, AR, Atlas, EL, Flocke, F, Harris, JM & Rowland, FS 1999, 'Aircraft measurements of the latitudinal, vertical, and seasonal variations of NMHCs, methyl nitrate, methyl halides, and DMS during the First Aerosol Characterization Experiment (ACE 1)', Journal of Geophysical Research C: Oceans, vol. 104, no. D17, 1999JD900238, pp. 21803-21817.
Blake, Nicola J. ; Blake, Donald R. ; Wingenter, Oliver W. ; Sive, Barkley C. ; Kang, Chang Hee ; Thornton, Donald C. ; Bandy, Alan R. ; Atlas, Elliot L ; Flocke, Frank ; Harris, Joyce M. ; Rowland, F. Sherwood. / Aircraft measurements of the latitudinal, vertical, and seasonal variations of NMHCs, methyl nitrate, methyl halides, and DMS during the First Aerosol Characterization Experiment (ACE 1). In: Journal of Geophysical Research C: Oceans. 1999 ; Vol. 104, No. D17. pp. 21803-21817.
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abstract = "Canister sampling for the determination of atmospheric mixing ratios of nonmethane hydrocarbons (NMHCs), selected halocarbons, and methyl nitrate was conducted aboard the National Center for Atmospheric Research (NCAR) C-130 aircraft over the Pacific and Southern Oceans as part of the First Aerosol Characterization Experiment (ACE 1) during November and December 1995. A latitudinal profile, flown from 76°N to 60°S, revealed latitudinal gradients for most trace gases. NMHC and halocarbon gases with predominantly anthropogenic sources, including ethane, ethyne, and tetrachloroethene, exhibited significantly higher mixing ratios in the northern hemisphere at all altitudes. Methyl chloride exhibited its lowest mixing ratios at the highest northern hemisphere latitudes, and the distributions of methyl nitrate and methyl iodide were consistent with tropical and subtropical oceanic sources. Layers containing continental air characteristic of aged biomass burning emissions were observed above about 3 km over the remote southern Pacific and near New Zealand between approximately 19°S and 43°S. These plumes originated from the west, possibly from fires in southern Africa. The month-long intensive investigation of the clean marine southern midlatitude troposphere south of Australia revealed decreases in the mixing ratios of ethane, ethyne, propane, and tetrachloroethene, consistent with their seasonal mixing ratio cycle. By contrast, increases in the average marine boundary layer concentrations of methyl iodide, methyl nitrate, and dimethyl sulfide (DMS) were observed as the season progressed to summer conditions. These increases were most appreciable in the region south of 44°S over Southern Ocean waters characterized as subantarctic and polar, indicating a seasonal increase in oceanic productivity for these gases.",
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AU - Sive, Barkley C.

AU - Kang, Chang Hee

AU - Thornton, Donald C.

AU - Bandy, Alan R.

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