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. 2021 Jul 9;16(1):78–90. doi: 10.1038/s41396-021-01049-y

Fig. 1. Sediment depth profiles for dissolved CH4 concentration and HCl-extractable iron contents in the seep site (70°22.669′N, 157°20.925´W) in Lake Qalluuraq near Atqasuk on the North Slope of the Brooks Range in Alaska.

Fig. 1

Images of CH4 ebullition at the water surface above the persistent seep location in May (A) and July (B), 2009. Dissolved CH4 concentration (C), HCl-extractable total Fe, Fe2+ and the percent of Fe2+ to total Fe of the seep-associated sediments (n = 3) collected in ice-covered May (D) and ice-free July 2009 (E). Error bars indicate standard deviation.