%0 Journal article
%A de Vrese, Philipp
%A Stacke, Tobias
%A Caves Rugenstein, Jeremy
%A Goodman, Jason
%A Brovkin, Victor
%T Snowfall-albedo feedbacks could have led to deglaciation of snowball Earth starting from mid-latitudes
%R 10.1038/s43247-021-00160-4
%J Communications Earth & Environment
%V 2
%N 1

%I Nature Publishing Group UK
%X Simple and complex climate models suggest a hard snowball – a completely ice-covered planet – is one of the steady-states of Earth’s climate. However, a seemingly insurmountable challenge to the hard-snowball hypothesis lies in the difficulty in explaining how the planet could have exited the glaciated state within a realistic range of atmospheric carbon dioxide concentrations. Here, we use simulations with the Earth system model MPI-ESM to demonstrate that terminal deglaciation could have been triggered by high dust deposition fluxes. In these simulations, deglaciation is not initiated in the tropics, where a strong hydrological cycle constantly regenerates fresh snow at the surface, which limits the dust accumulation and snow aging, resulting in a high surface albedo. Instead, comparatively low precipitation rates in the mid-latitudes in combination with high maximum temperatures facilitate lower albedos and snow dynamics that – for extreme dust fluxes – trigger deglaciation even at present-day carbon dioxide levels.
%U http://resolver.sub.uni-goettingen.de/purl?gldocs-11858/11140
%~  FID GEO-LEO e-docs