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. 2020 Nov 29;8(12):1889. doi: 10.3390/microorganisms8121889

Figure 1.

Figure 1

Historical overview of marine iron concentrations, as reviewed by de Baar (1994) [28]. * Proposed concentration based off data supposedly published by Schmidt in 1874 [29] and 1877 [30], as cited by Vernadsky (1924) [31] and Lewis and Goldberg (1954) [32]. Further referenced iron concentrations from Orton, 1923 [33], Harvey, 1925 [34], Wattenberg, 1927 [35], Braarud & Klem, 1931 [36], Thompson et al., 1932 [37], Cooper, 1935a [38], Thompson and Bremner, 1935b [39], Seiwell, 1935c [40], Rakestraw et al., 1936 [41], Simons et al., 1953 [42], Armstrong, 1957 [43], Menzel and Spaeth, 1962 [44], Subba Rao and Yeats, 1984 [45], and Symes and Kester, 1985 [46].