Annual layers in polar firn detected by Borehole Optical Stratigraphy

• Other Authors: The Pennsylvania State University CiteSeerX Archives
• Format: Text
• Language: English
• Subjects: most detailed record can be obtained by counting annual; Austral; Siple; Siple Dome; Antarc*; Antarctica; ice core
• Online Access: http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.482.9341; http://earthweb.ess.washington.edu/~bo/papers/layers_preprint/2003GL017675.pdf

[1] We have developed a system called Borehole Optical Stratigraphy which can detect annual layers in boreholes in polar firn. Borehole Optical Stratigraphy consists of a downhole camera package and post-processing routines, which allow us to measure the intensity of light emitted from an on-board source and returned from the borehole wall. We manually identify the annual layers in this optical signal. We used this system at Siple Dome, Antarctica, in the 2001–2002 austral summer season. Our results agree well with counts of annual layers detected with two different methods in an ice core recovered 50 meters from