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Next One:43. Geng, L.*, J. Cole-Dai, B. Alexander, J. Erbland, J. Savarino, A.J. Schauer, E.J. Steig, P. Lin, Q. Fu and M.C. Zatko, On the Origin of the Occasional Springtime Nitrate Concentration Maximum in Greenland Snow, Atmos. Chem. Phys., 14, 13361-13376, doi:10.5194/acp-14-13361-2014 (2014).