Unknown
International Glaciological Society
In:
EPIC3International Symposium on Ice Cores and Climate, Kangerlussuaq, Hotel and Conference Center, 2001-08-19-2001-08-23Kangerlussuaq, Greenland, International Glaciological Society
Publication Date:
2018-09-18
Description:
The paper presents first results from the upper 54 m of a 723.91 m ice core drilled on
Academy of Sciences Ice Cap in 1999-2001, supplemented by data from shallow ice cores.
The glacier's peculiarity is the infiltration and refreezing of melting water thereby changing
original isotopic and chemical signals. Therefore, stratigraphical observations in these ice
cores are more difficult than in those from central Greenland or Antarctica. However, the 1963
maximum of artificial radioactivity from atmospheric nuclear tests is clearly detectable in the
deep ice core and the d180 profile of a 12.82 m shallow core shows annual variations.
Consequently, an almost seasonal time resolution of paleoclirnate record could be expected at
least for the upper part of the main core. The Chemobyl layer was detected by increased 137 Cs
activity in depths between 11.81 m and 12.51 m related to the 2000 surface. The resulting
mean annual net mass balance is 53 ± 2 g cm-2 a- 1.
Data from dielectric profiling (DEP) of the main core show considerable peaks in
conductivity; one of them was interpreted as volcano event. According to the resulting
chronology this part of the core represents approximately the last 100 years.
Repository Name:
EPIC Alfred Wegener Institut
Type:
Conference
,
notRev
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