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| Titel |
Centennial mineral dust variability in high-resolution ice core data from Dome C, Antarctica |
| VerfasserIn |
F. Lambert, M. Bigler, J. P. Steffensen, M. Hutterli, H. Fischer |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1814-9324
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| Digitales Dokument |
URL |
| Erschienen |
In: Climate of the Past ; 8, no. 2 ; Nr. 8, no. 2 (2012-03-22), S.609-623 |
| Datensatznummer |
250005472
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| Publikation (Nr.) |
 copernicus.org/cp-8-609-2012.pdf |
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| Zusammenfassung |
| Ice core data from Antarctica provide detailed insights into the
characteristics of past climate, atmospheric circulation, as well as changes
in the aerosol load of the atmosphere. We present high-resolution records of
soluble calcium (Ca2+), non-sea-salt soluble calcium (nssCa2+),
and particulate mineral dust aerosol from the East Antarctic Plateau at a
depth resolution of 1 cm, spanning the past 800 000 years. Despite the fact
that all three parameters are largely dust-derived, the ratio of
nssCa2+ to particulate dust is dependent on the particulate dust
concentration itself. We used principal component analysis to extract the
joint climatic signal and produce a common high-resolution record of dust
flux. This new record is used to identify Antarctic warming events during
the past eight glacial periods. The phasing of dust flux and CO2
changes during glacial-interglacial transitions reveals that iron
fertilization of the Southern Ocean during the past nine glacial
terminations was not the dominant factor in the deglacial rise of CO2
concentrations. Rapid changes in dust flux during glacial terminations and
Antarctic warming events point to a rapid response of the southern westerly
wind belt in the region of southern South American dust sources on changing
climate conditions. The clear lead of these dust changes on temperature rise
suggests that an atmospheric reorganization occurred in the Southern
Hemisphere before the Southern Ocean warmed significantly. |
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