Sixty year ¹⁰Be record from Greenland and Antarctica.

Proc. Indian Aca. Sci. (Earth Planet. Sci.), Vol 107, No. 2. June 1998

A. Aldahan
Institue of Earth Sciences, Uppsala University, S.751 21 Uppsala, Sweden
and Tandem Laboratory, Uppsala University, S.751 21 Uppsala, Sweden
G. Possnert
Tandem Laboratory, Uppsala University, S.751 21 Uppsala, Sweden
S.J. Johnsen,
Science Institute, University of Iceland, Reykjavik .
H.B. Clausen
Departement of Geophysics, The Niels Bohr Institute of Astronomy, Physics and Geophysics, University of Copenhagen..
E. Isaksson
Norwegean Polar Institute, Box 5072, N-0301 Oslo, Norway.
W. Karlén
Dep. of Physical Geography, University of Stockholm, S-106 91, Stodkholm, Sweden.
M. Hansson
Dep. of Meteorology, University of Stockholm, S-106 91, Stodkholm, Sweden.

ABSTRACT.
We report in this study the distribution of ¹⁰Be in the top of the Renland ice core (East Greenland) and in a 30 m long core from DML (Dronning Maud Land, Antarctica) for the period 1931-1988. The two sites show differences in ¹⁰Be content, the Antarctica site showing smaller variance and a lower average ¹⁰Be annual flux. Similarly, the average accumulation rate (cm water equivalent per year) is higher in the Renland relative to DML. The variability in accumulation (precipitation) rates seems to explain part of the difference in¹⁰Be flux between the two polar sites. Cyclic fluctuations of ¹⁰Be flux correlate with the 11-year sunspot number and cosmic ray intensity than with the aa index (pertubation of the geomagnetic activity by the solar wind). Our data corroborate ¹⁰Be cyclic fluctuation pattern from the Dye 3 ice core and confirm a promising potential for correlation of global and local events.