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Victoria University Antarctic Research Expedition Science and Logistics Reports 2004-05: VUWAE 49

Borehole Measurements

Borehole Measurements

Once the drilling operation was completed borehole temperature and light penetration measurements were conducted. Borehole temperature provides a back-up measurement for the core temperature and verified that average annual temperature at EPG is −22°C and at MES – 25.6°C. The light penetration measurement was conducted to investigate if optical stimulated luminescence (OSL) could be used to date independently dust layers in the ice core record. Our measurements are encouraging. The OSL clock starts counting, when the sample is in complete darkness and is reset when exposed to light. We therefore wanted to determine the depth at which the OSL age would start counting. Our light measurements reveal that the light extinction curve is very sharp at both sites and darkness (<micro lux) is reached within 6m of the surface.