Henrieka Detlef, Aarhus University, Institute of Geoscience, Aarhus C, Denmark, Brendan T Reilly, CEOAS, Corvallis, OR, United States, Anne E Jennings, Institute of Arctic and Alpine Research, Boulder, CO, United States, Alan C Mix, CEOAS, Oregon State University, Corvallis, OR, United States, Martin Jakobsson, Stockholm University, Department of Geological Sciences, Stockholm, Sweden, Marianne Glasius, Aarhus University, Dep. of Chemistry, Aarhus C, Denmark and Christof Pearce, Aarhus University, Department of Geoscience, Aarhus C, Denmark