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| Titel |
On the occurrence of annual layers in Dome Fuji ice core early Holocene ice |
| VerfasserIn |
A. Svensson, S. Fujita, M. Bigler, M. Braun, R. Dallmayr, V. Gkinis, K. Goto-Azuma, M. Hirabayashi, K. Kawamura, S. Kipfstuhl, H. A. Kjær, T. Popp, M. Simonsen, J. P. Steffensen, P. Vallelonga, B. M. Vinther |
| 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 ; 11, no. 9 ; Nr. 11, no. 9 (2015-09-15), S.1127-1137 |
| Datensatznummer |
250117400
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| Publikation (Nr.) |
 copernicus.org/cp-11-1127-2015.pdf |
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| Zusammenfassung |
| Whereas ice cores from high-accumulation sites in coastal Antarctica clearly
demonstrate annual layering, it is debated whether a seasonal signal is also
preserved in ice cores from lower-accumulation sites further inland and
particularly on the East Antarctic Plateau. In this study, we examine 5 m of
early Holocene ice from the Dome Fuji (DF) ice core at a high temporal
resolution by continuous flow analysis. The ice was continuously analysed for
concentrations of dust, sodium, ammonium, liquid conductivity, and water
isotopic composition. Furthermore, a dielectric profiling was performed on
the solid ice. In most of the analysed ice, the multi-parameter impurity data
set appears to resolve the seasonal variability although the identification
of annual layers is not always unambiguous. The study thus provides
information on the snow accumulation process in central East Antarctica. A
layer counting based on the same principles as those previously applied to
the NGRIP (North Greenland Ice core Project) and the Antarctic EPICA
(European Project for Ice Coring in Antarctica) Dronning Maud Land (EDML) ice cores leads to a mean annual layer thickness
for the DF ice of 3.0 ± 0.3 cm that compares well to existing
estimates. The measured DF section is linked to the EDML ice core through a
characteristic pattern of three significant acidity peaks that are present in
both cores. The corresponding section of the EDML ice core has recently been
dated by annual layer counting and the number of years identified
independently in the two cores agree within error estimates. We therefore
conclude that, to first order, the annual signal is preserved in this section
of the DF core. This case study demonstrates the feasibility of determining
annually deposited strata on the central East Antarctic Plateau. It also
opens the possibility of resolving annual layers in the Eemian section of
Antarctic ice cores where the accumulation is estimated to have been greater
than in the Holocene. |
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