Mercury geochemistry of marine sediments from the eastern Laptev Sea: The spatial distribution, levels, and contamination assessment

Mercury Burial in Modern Sedimentary Systems of the East China Marginal Seas: The Role of Coastal Oceans in Global Mercury Cycling

“…The average Hg‐AR in the ECMS (376 μg m −2 yr −1 , n = 11; Figure 1b) is comparable to that of the east coasts of the USA (including the Mississippi River Delta, Estuary and Gulf of St. Lawr, Penobscot and Pettaquamscutt River Estuary; 420 μg m −2 yr −1 , n = 23; Fitzgerald et al., 2018; Santschi et al., 2001; J. N. Smith & Schafer, 1999; Yeager, Schwehr, Louchouarn, et al., 2018; Yeager, Schwehr, Schindler, & Santschi, 2018) and Canada coasts (the Hudson Bay and Strait of Georgia; 392 μg m −2 yr −1 , n = 28; Hare et al., 2010; Johannessen et al., 2005). These estimates are 2‐fold higher than those of coastal regions with lower sedimentation rates (<0.5 g cm −2 yr −1 ), such as the coasts of Northern Europe (including the Baltic Sea and Portuguese margin; 57.4 μg m −2 yr −1 , n = 9; Leipe et al., 2013; Mil‐Homens et al., 2009) and the coasts of Russia (the Laptev, Siberian, and Chukchi Seas; 31.5 μg m −2 yr −1 , n = 3; Aksentov et al., 2021; Fox et al., 2014; D. V. Kim et al., 2023), as well as the coasts of Antarctica (the Ross Sea; 14.1 μg m −2 yr −1 ; Zheng et al., 2015). The contemporary Hg‐AR in the ECMS is approximately 4‐ and 5‐fold higher than the global median (∼80 μg m −2 yr −1 ), one to two orders of magnitude larger than other coastal oceans in the world with relatively low MAR (0.02–0.1 g cm −2 yr −1 ; Figure S9 in Supporting Information S1), and the currently estimated deep‐ocean average of 0.7–10.4 μg m −2 yr −1 (Cossa et al., 2021; Outridge et al., 2018; Sanei et al., 2021; Y. X. Zhang et al., 2015).…”

“…N. Smith & Schafer, 1999;Yeager, Schwehr, Louchouarn, et al, 2018; and Canada coasts (the Hudson Bay and Strait of Georgia; 392 μg m −2 yr −1 , n = 28; Hare et al, 2010;Johannessen et al, 2005). These estimates are 2-fold higher than those of coastal regions with lower sedimentation rates (<0.5 g cm −2 yr −1 ), such as the coasts of Northern Europe (including the Baltic Sea and Portuguese margin; 57.4 μg m −2 yr −1 , n = 9; Leipe et al, 2013;Mil-Homens et al, 2009) and the coasts of Russia (the Laptev, Siberian, and Chukchi Seas; 31.5 μg m −2 yr −1 , n = 3; Aksentov et al, 2021;Fox et al, 2014;D. V. Kim et al, 2023), as well as the coasts of Antarctica (the Ross Sea; 14.1 μg m −2 yr −1 ; Zheng et al, 2015).…”