Nathan Chellman¹, Joseph R McConnell², Andrew I Wilson³, Andreas Stohl⁴, Monica M Arienzo⁵, Sabine Eckhardt⁶, Diedrich Fritzsche⁷, Sepp Kipfstuhl⁸, Thomas Opel⁹, Elisabeth Thompson³, Mark Pollard³, Philip Place Jr¹⁰ and Jorgen Peder Steffensen¹¹, (1)Desert Research Institute Reno, Reno, NV, United States, (2)Desert Res Inst, Reno, NV, United States, (3)University of Oxford, Oxford, United Kingdom, (4)Norwegian Institute for Air Research, Kjeller, Norway, (5)Desert Research Institute, Reno, NV, United States, (6)Norwegian Institute for Air Research, Atmospheric and Climate Research (ATMOS), Kjeller, Norway, (7)Alfred Wegener Institute Helmholtz-Center for Polar and Marine Research Potsdam, Potsdam, Germany, (8)Alfred Wegener Institute, Bremerhaven, Germany, (9)Alfred Wegener Institute Helmholtz-Center for Polar and Marine Research Potsdam, Department of Periglacial Research, Potsdam, Germany, (10)University of Rochester, Department of Earth and Environmental Sciences, Rochester, NY, United States, (11)Centre for Ice and Climate, Copenhagen, Denmark