General Information

D4 is a 10.2 cm diameter, 146 m long core drilled in 2003 to investigate annual accumulation over recent centuries in central Greenland. The ice core was analyzed by CFA by Joe McConnell and annually dated based on multiple seasonal markers, including hydrogen peroxide (H2O2), total sulfur, lead, and sea-salt and dust tracers (for example, Na, Mg, Ca). The period of record in the D4 core is 1734-2003 (McConnell and others, 2019). There is only a small section of core remaining in the archive.

  • Banta JR and McConnell JR (2007) Annual accumulation over recent centuries at four sites in central Greenland. Journal of Geophysical Research, 112, D10114. https://doi.org/10.1029/2006JD00788
  • McConnell JR, Chellman NJ, Wilson AI, Stohl A, Arienzo MM, Eckhardt S, Fritzsche D, Kipfstuhl S, Opel T, Place PF, Steffensen JP (2019) Pervasive Arctic lead pollution suggests substantial growth in medieval silver production modulated by plague, climate, and conflict. Proceedings of the National Academy of Sciences Jul 2019, 116 (30) 14910-14915. https://doi.org/10.1073/pnas.1904515116