Anomalous accumulation rates in the Vostok ice-core resulting from ice flow over Lake Vostok
- Anomalous accumulation rates in the Vostok ice-core resulting from ice flow over Lake Vostok
- Leonard, Katherine
Bell, Robin E.
- Lamont-Doherty Earth Observatory
- Persistent URL:
- Book/Journal Title:
- Geophysical Research Letters
- The accumulation rate of snow is crucial to the
development of accurate age-depth models for ice-cores.
The dating of the Vostok ice-core assumes that accumulation
rates generally vary linearly between the core site and
the ice divide 250 km to the west [Jouzel et al., 1996;
Lorius et al., 1985; Petit et al., 1999], an assumption which
impacts the timing of prominent climatic transitions. We
present evidence for a local accumulation rate anomaly at
the ice surface above the western shoreline of Lake Vostok.
A significant thickening between isochronous layers results
from this geographically fixed high accumulation zone
which can be stratigraphically traced to a depth of 820 –
1100 m in the Vostok ice-core, a portion known for its high
accumulation rates and paleoclimate records that deviate
from other Antarctic ice-core records. This non-climatic
accumulation anomaly in the Vostok ice-core impacts the
flow dependent age models and subsequent interpretations
of sequencing of global climate shifts during the last glacial.
These previously unreported geographically fixed accumulation
rate anomalies are introduced into ice-cores drilled away
from ice domes (e.g., Byrd and Vostok) and should be
considered in age depth models.
- Hydrologic sciences
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- Suggested Citation:
- Katherine Leonard, Robin E. Bell, Michael Studinger, Bruno Tremblay, 2004, Anomalous accumulation rates in the Vostok ice-core resulting from ice flow over Lake Vostok, Columbia University Academic Commons, http://hdl.handle.net/10022/AC:P:10760.