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| Titel |
Changes in black carbon deposition to Antarctica from two high-resolution ice core records, 1850–2000 AD |
| VerfasserIn |
M. M. Bisiaux, R. Edwards, J. R. McConnell, M. A. J. Curran, T. D. Ommen, A. M. Smith, T. A. Neumann, D. R. Pasteris, J. E. Penner, K. Taylor |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1680-7316
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Chemistry and Physics ; 12, no. 9 ; Nr. 12, no. 9 (2012-05-09), S.4107-4115 |
| Datensatznummer |
250011123
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| Publikation (Nr.) |
 copernicus.org/acp-12-4107-2012.pdf |
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| Zusammenfassung |
| Refractory black carbon aerosols (rBC) emitted by biomass burning (fires)
and fossil fuel combustion, affect global climate and atmospheric chemistry.
In the Southern Hemisphere (SH), rBC is transported in the atmosphere from
low- and mid-latitudes to Antarctica and deposited to the polar ice sheet
preserving a history of emissions and atmospheric transport. Here, we
present two high-resolution Antarctic rBC ice core records drilled from the
West Antarctic Ice Sheet divide and Law Dome on the periphery of the East
Antarctic ice sheet. Separated by ~3500 km, the records span calendar
years 1850–2001 and reflect the rBC distribution over the Indian and Pacific
ocean sectors of the Southern Ocean. Concentrations of rBC in the ice cores
displayed significant variability at annual to decadal time scales, notably
in ENSO-QBO and AAO frequency bands. The delay observed between rBC and
ENSO variability suggested that ENSO does not directly affect rBC transport,
but rather continental hydrology, subsequent fire regimes, and aerosol
emissions. From 1850 to 1950, the two ice core records were uncorrelated but
were highly correlated from 1950 to 2002 (cross-correlation coefficient at
annual resolution: r = 0.54, p < 0.01) due to a common decrease in rBC
variability. The decrease in ice-core rBC from the 1950s to late 1980s
displays similarities with inventories of SH rBC grass fires and biofuel
emissions, which show reduced emission estimates over that period. |
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