A Digital Thermometer to Enhance High Resolution Borehole Paleothermometry at Siple Dome and Beyond: a Unique Opportunity

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0087273 WaddingtonThis award supports the development and testing of digital probesfor high precision temperature measurements in boreholes in polarice sheets. These measurements are key to obtaining calibratedpaleotemperature records in the polar regions.The current state-of-the-art system is the USGS Polar BoreholeTemperature Logging System (PBTS), which uses analog probe technologywith the electronic package at the ice sheet surface. Strong winds candisturb the recording electronics, forcing the field team to modifylogistics plans to produce high quality data. Probes that transmitdigital signals up the cable would not be affected by these surfaceconditions, improving the efficiency of field operations. This projectwill adapt a recently-designed digital probe for use with the PBTS systemin cold temperatures in polar drilling fluids. These probes will reducesome of the stringent hardware and procedural requirements of the currentanalog system. These new digital probes will be calibrated alongside thecurrently used sensors and will be tested at Siple Dome as part of analready-funded program of borehole temperature logging. The final product(in addition to a working borehole temperature logging system with newdigital probes) will be a publication in the Journal of Glaciologydescribing the new probes, the comparisons, and the new researchopportunities that digital probes can offer.