Deutsch
 
Hilfe Datenschutzhinweis Impressum
  DetailsucheBrowse

Datensatz

DATENSATZ AKTIONENEXPORT
  Carbonaceous aerosols over the Indian Ocean during the Indian Ocean Experiment (INDOEX): Chemical characterization, optical properties, and probable sources

Mayol-Bracero, O. L., Gabriel, R., Andreae, M. O., Kirchstetter, T. W., Novakov, T., Ogren, J., et al. (2002). Carbonaceous aerosols over the Indian Ocean during the Indian Ocean Experiment (INDOEX): Chemical characterization, optical properties, and probable sources. Journal of Geophysical Research, 107(D19): 8030. doi:10.1029/2000JD000039.

Item is

Basisdaten

einblenden: ausblenden:
Genre: Zeitschriftenartikel
Alternativer Titel : J. Geophys. Res.

Externe Referenzen

einblenden:

Urheber

einblenden:
ausblenden:
 Urheber:
Mayol-Bracero, O. L.1, Autor           
Gabriel, R.1, Autor           
Andreae, M. O.1, Autor           
Kirchstetter, T. W., Autor
Novakov, T., Autor
Ogren, J., Autor
Sheridan, P., Autor
Streets, D. G., Autor
Affiliations:
1Biogeochemistry, Max Planck Institute for Chemistry, Max Planck Society, ou_1826286              

Inhalt

einblenden:
ausblenden:
Schlagwörter: carbonaceous aerosols; INDOEX; chemical characterization; optical properties; sources; aerosols
 Zusammenfassung: [1] We measured carbonaceous material and water-soluble ionic species in the fine fraction (D-p < 1.3 μm) of aerosol samples collected on NCAR's C-130 aircraft during the intensive field phase (February-March 1999) of the Indian Ocean Experiment (INDOEX). Polluted layers were present over most of the study region north of the equator at altitudes up to 3.2 km. The estimated aerosol mass (sum of carbonaceous and soluble ionic aerosol components) of fine-mode particles in these layers was 15.3 +/- 7.9 μg m(-3). The major components were particulate organic matter (POM, 35%), SO42- (34%), black carbon (BC, 14%), and NH4+ (11%). The main difference between the composition of the marine boundary layer (MBL, 0 to similar to1.2 km), and the overlying residual continental boundary layer (1.2 to similar to3.2 km) was a higher abundance of SO42- relative to POM in the MBL, probably due to a faster conversion of SO2 into SO42- in the MBL. Our results show that carbon is a major, and sometimes dominant, contributor to the aerosol mass and that its contribution increases with altitude. Low variability was observed in the optical properties of the aerosol in the two layers. Regression analysis of the absorption coefficient at 565 nm on BC mass (BC < 4.0 μg C m(-3)) yielded a specific absorption cross section of 8.1 +/- 0.7 m(2) g(-1) for the whole period. The unusually high fraction of BC and the good correlation between the absorption coefficient and BC suggest that BC was responsible for the strong light absorption observed for the polluted layers during INDOEX. High correlation between BC and total carbon (TC) (r(2) = 0.86) suggest that TC is predominantly of primary origin. Good correlations were also found between the scattering coefficient at 550 nm and the estimated aerosol mass for the fine fraction. These yielded a specific scattering cross section of 4.9 +/- 0.4 m(2) g(-1). The observed BC/TC, BC/OC, SO42-/BC, and K+/BC ratios were fairly constant throughout the period. These ratios suggest that between 60 and 80% of the aerosol in the polluted layers during INDOEX originated from fossil fuel and between 20 and 40% from biofuel combustion.

Details

einblenden:
ausblenden:
Sprache(n): eng - English
 Datum: 2002-09
 Publikationsstatus: Erschienen
 Seiten: -
 Ort, Verlag, Ausgabe: -
 Inhaltsverzeichnis: -
 Art der Begutachtung: Expertenbegutachtung
 Identifikatoren: eDoc: 18230
ISI: 000180428300064
DOI: 10.1029/2000JD000039
 Art des Abschluß: -

Veranstaltung

einblenden:

Entscheidung

einblenden:

Projektinformation

einblenden:

Quelle 1

einblenden:
ausblenden:
Titel: Journal of Geophysical Research
  Alternativer Titel : J. Geophys. Res.
Genre der Quelle: Zeitschrift
 Urheber:
Affiliations:
Ort, Verlag, Ausgabe: -
Seiten: - Band / Heft: 107 (D19) Artikelnummer: 8030 Start- / Endseite: - Identifikator: ISSN: 0747-7309