Diatom-inferred Holocene pH histories of lakes in arctic Fennoscandia and the Kola Peninsula

Diatom-inferred Holocene pH histories of lakes in arctic Fennoscandia and the Kola Peninsula. Toskaljavri (a) is redrawn from Seppä et al. (2002), Tsuolbmajavri (b) from Seppä and Weckström (1999), Lake Chuna (c) from Solovieva and Jones (2002), and Njargajavri (d) from Sarmaja-Korjonen et al. (2006). Note the different scales for pH and time (cal. BP means calibrated years before present).