摘要：Over the last 25 years, the three
deep ice cores 3G, 4G and 5G,
drilled at the Russian Vostok Station
(Fig.1), have provided a wealth
of information about past climate
and environmental changes. At
this site in East Antarctica, the ice
thickness is 3750 m and the snow
accumulation rate is only 2.1 cm
of water equivalent per year. This
provides the unique opportunity to
obtain a long climatic record with
relatively high time-resolution. In
January 1998, the collaborative
project between Russia, France
and the United States to drill the
5G hole at Vostok yielded the longest
ice core ever recovered, reaching
a depth of 3623 m. The drilling
stopped 130 m above Lake Vostok,
a deep subglacial water body that
extends over a large area below
the ice sheet.
