The Roosevelt Island Ice Core Chronology 2017 (RICE17)

A timescale for the Roosevelt Island Climate Evolution (RICE) ice core, Ross Ice Shelf, West Antarctica, covering the last 83,000 years. Top part (0-343.67m) of the ice chronology is based on annual layer counting. Below 343.67m, the ice chronology is based on gas matching to WAIS Divide on the WD2014 chronology and modelling of delta-age. The gas timescale (entire core) is based on gas matching to target records derived from WAIS Divide on the WD2014 chronology and NGRIP on the GICC05 chronology, modified for continuity with WD2014. The chronology (0-746m) is interpolated between matchpoints assuming piecewise constant accumulation and linearly decreasing annual layer thicknesses. For the top 343.67m, depths of the gas-age matchpoints have been interpolated to the nearest annual layer. Continuity of the RICE ice core ends at 746.00 m, and delta-age was not calculated for the deeper part. In this section, the interpolated gas timescale is calculated using linear interpolation between matchpoints, and ice ages are calculated using a constant delta-age of 200 years. For questions on the use or construction of this chronology, please contact: Mai Winstrup mailto:mai@nbi.ku.dk : Annual-layer-counted ice chronology (0-343.67m) James E. Lee mailto:jlee@coas.oregonstate.edu : Gas chronology (all core), and gas-matched ice chronology (343.67-753.75m)