摘要：Ice cores provide the most direct
and highest temporal resolution record
of past atmospheric and precipitation
chemistry, and local to
regional-scale meteorology. Such records
have been used to reconstruct
changes in oceanic and atmospheric
circulation, to document industrial
pollution and volcanic emissions,
and to investigate current and past
surface mass balance and net snowfall.
An ice core chemical record reflects
changes in both emissions
from the source regions and transport
pathways, so arrays of ice core
records are required to distinguish
between these often covarying phenomena.
Moreover, arrays of ice
cores offer the potential to identify
spatial variability in emissions, climate,
and meteorology. Extensive
arrays of ice cores (Fig. 1) have been
collected recently on the Greenland
Ice Sheet (GIS) under two projects:
the Alfred-Wegener-Institute North
Greenland Traverse (NGT) (following
the 1990 to 1992 German/Swiss
glaciological study along the old
line of the Expedition Glaciologique
International au Groenland (EGIG)
in central Greenland) and the U.S.
Program for Arctic Regional Climate
Assessment (PARCA).
