An aerial view of one of the 'upwellings' at the front of Humboldt glacier. A Greenpeace inflatable carries glaciologists interested in these 'upwellings' or plumes of turbid fresh-water as they contain valuable information about melt dynamics within Humboldt. A large quantity of melt water, flowing from inland, has been making its way to the base of the front of the glacier, via networks of ravines, moulins and channels to cause this upwelling through the salt water in the fjord. The ice debris and surface differences in this photograph show the boundary where saline and fresh water mix.