Joint assembly AGU-GAC-MAC-CGU
Year of publication:
In this study, two sets of CRCM5 simulations were carried out, with and without interactive snow, to investigate the role of snow-atmosphere coupling in modulating climate variability during cold season over North America. In the coupled simulation, snow interacts freely with the atmosphere at each time step, while in the uncoupled simulation, snow related model variables (i.e. snow mass, snow density and snow depth) are replaced with climatological values, derived from the coupled simulation, to suppress the snow-atmosphere interactions. Results indicate that a strong land–atmosphere coupling (mainly via snow cover variability) is noted in winter and spring over northern US and most parts of central Canada including the prairies. Over these regions, snow plays an important role in amplifying winter and spring surface air temperature variability through its influence on surface albedo.