 |
| Titel |
Variability of black carbon deposition to the East Antarctic Plateau, 1800-2000 AD |
| VerfasserIn |
M. M. Bisiaux, R. Edwards, J. R. McConnell, M. R. Albert, H. Anschütz, T. A. Neumann, E. Isaksson, J. E. Penner |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1680-7316
|
| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 12, no. 8 ; Nr. 12, no. 8 (2012-04-26), S.3799-3808 |
| Datensatznummer |
250011078
|
| Publikation (Nr.) |
 copernicus.org/acp-12-3799-2012.pdf |
|
|
|
|
|
| Zusammenfassung |
| Refractory black carbon aerosols (rBC) from biomass burning and fossil fuel
combustion are deposited to the Antarctic ice sheet and preserve a history
of emissions and long-range transport from low- and mid-latitudes. Antarctic ice core
rBC records may thus provide information with respect to past combustion
aerosol emissions and atmospheric circulation. Here, we present six East
Antarctic ice core records of rBC concentrations and fluxes covering the
last two centuries with approximately annual resolution (cal. yr. 1800 to
2000). The ice cores were drilled in disparate regions of the high East
Antarctic ice sheet, at different elevations and net snow accumulation
rates. Annual rBC concentrations were log-normally distributed and geometric
means of annual concentrations ranged from 0.10 to 0.18 μg kg−1. Average
rBC fluxes were determined over the time periods 1800 to 2000 and 1963 to
2000 and ranged from 3.4 to 15.5 μg m−2 a−1 and 3.6 to
21.8 μg m−2 a−1, respectively. Geometric mean concentrations spanning 1800 to
2000 increased linearly with elevation at a rate of 0.025 μg kg−1/500 m.
Spectral analysis of the records revealed significant decadal-scale
variability, which at several sites was comparable to decadal ENSO
variability. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|