SNOW GRID DATA COLLECTION

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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 Delta18O 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 Delta18O variability with respect to the profile in the ice-core record.

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