Fig. 5: Surface-water methane concentrations of fjords adjacent to marine-terminating glaciers.
From: Groundwater springs formed during glacial retreat are a large source of methane in the high Arctic
Methane concentrations (nM) are denoted by coloured shading on the maps and are interpolated from the sampling points (grey dots) using Data-Interpolating Variational Analysis. Note the different concentration scale on each map. Concentrations are displayed for subsea-ice surface waters adjacent to three marine-terminating glaciers (glaciers are light grey; land is dark grey). a, Fridtjovbreen (Triassic–Middle Jurassic). b, Paulabreen (Early Cretaceous). c, Tunabreen (Carboniferous and Permian). Water depths are less than 60 m. Land and glacier shapefiles were digitalized manually by tracing Sentinel-2 satellite images. Figure created with Ocean Data View (https://odv.awi.de).
