Ice core chemistry data from each end of the traverse

Ice core glaciochemical data including stable water isotopes (delta 18O and delta deuterium), and major ion and trace element concentrations (strontium - Sr, cesium - Cs, barium - Ba, lanthanum - La, cerium - Ce, praseodymium - Pr, lead - Pb, bismuth - Bi, uranium - U, lithium - Li, aluminum - Al, sulfur - S, calcium - Ca, titanium - Ti, vanadium - V, chromium - Cr, manganese - Mn, iron - Fe, cobalt - Co, sodium - Na, magnesium - Mg, potassium - K, methanesulfonic acid - MSA, chloride- Cl, nitrate - NO3, sulfate - SO4) from three Greenland locations: 1) The "Owen" ice core collected from Summit Station, Greenland (72.58 N, 38.45 W, 3200 m elevation), in July, 2010. 2) The "2Barrel" ice core collected near Camp Century on the NW Greenland Ice Sheet (76.93 N, 63.12 W, 1685 m elevation), in July, 2011; and 3) The "Galen" ice core collected from 74.42 N 39.29 W 2950 m elevation) in APRIL OR MAY, 2011. The 2Barrel and Galen ice cores were collected using PICO and Kovacs hand augers, respectively, while the Owen ice core was collected using the IDDO 4-inch electromechanical drill. Cores were sampled at 4-10 cm resolution under clean-room conditions using the Dartmouth College ice core melter system with discrete sampling (Osterberg et al., 2006). Trace element concentrations were measured on the University of Maine Climate Change Institute Thermo ELEMENT2 ICP-MS. Stable water isotope ratios were measured on Picarro L1102-i Liquid Water Analyzers at Dartmouth and in the Iowa State University Stable Isotope Laboratory. Sulfate, nitrate, chloride, and methanesulfonate concentrations were measured on the 2Barrel ice core samples by Dionex ICS-5000 capillary ion chromatograph. Timescales for each core were created through multi-paramater annual layer counting of season oscillations in sea-salt (Na, Cl), dust (Al, Fe, U), and MSA concentrations, and stable water isotope (d18O, dD) ratios. The uncertainty in each timescale is +- 0.5 years based on repeat, independent annual layer counts.