Fig. 2: Images of proglacial icings of land-terminating glaciers.
From: Groundwater springs formed during glacial retreat are a large source of methane in the high Arctic
a, Drone image of a winter icing formed at the glacier margin and extending within the proglacial river floodplain. b, Ice blister formed within an icing due to pressurized groundwater flow during winter. c, Aerial image of glacier (right) and icing remnants (left) in mid-summer. d, Icing field in early summer. e, Icing surface in summer with person for scale; ice layers formed by subsequent winter groundwater outflows are visible. Credit: photograph in c, Norwegian Polar Institute.
