|
One-hundred,
equally spaced samples of surface snow (top 5 centimeters) from an 8,100
square meter (m2) area adjacent to the drill site were analyzed
for 
18O to quantify lateral variability at the drilling site.
The snow-grid data were block kriged using 25 square blocks and a maximum
search distance of 50 m. The estimate and one sigma uncertainty for each
block was then contoured. The average two sigma uncertainty from the block
kriging results (mean = -14.90 + 1.53 permil, N = 25) was used to establish
the upper and lower limits of significant 18O variability with
respect to the profile in the ice-core record.
