Impacts of varying concentrations of cloud condensation nuclei on deep convective cloud updrafts: A multimodel assessment by Marinescu, P, van den Heever, S, Heikenfeld, M, Barret, A, Barthlott, C, Hoose, C, Fan, J, Fridlind, A, Matsui, T, Miltenberger, A, Stier, P, Vie, B, White, B, Zhang, Y