| Summary: | This dataset was used to create a depth-age scale of the NEEM 2008 S3 firn core using annual layer counting of multiple seasonally-varying chemical parameters (McConnell et al., 2007). This depth-age scale was used to date the layers of other NEEM firn cores, in an effort to date the layers of interesting physical property and chemical impurities layers. The 2008 S3 chronology is consistent with the independently layer-counted 2011 S1 (Sigl et al., 2015) and D4 core chronologies (McConnell et al., 2007) at >10 volcanic tie points between 1750 and 2008. Mean 1850 to 2008, water-equivalent accumulation rates in the 2008 S3 and 2011 S1 cores were 202 and 206 kg m-2 y-1 (0.220 and 0.224 m ice eq. a-1), respectively, suggesting relatively uniform net snowfall rates at NEEM. Estimated uncertainty in the 2008 S3 and 2011 S1 chronologies are <1 year, suggesting an estimated uncertainty in the 2009 S2 chronology used in this study of <2 years. This data set includes measurements of S (ng g-1), Sr (ng g-1), and Ca (ng g-1) concentrations by Year (A.D.) and depth from surface (m) from the NEEM 2008 S3 firn core.
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