Physical and biogeochemical controls on seasonal iron, manganese, and cobalt distributions in Northeast Atlantic shelf seas

Expansion of Ocean Anoxia During Glacial Periods Recorded in the Cobalt Flux to Pelagic Sediments

“…Due to its short residence time, sustaining elevated Co flux over millennia requires an increase in Co supply to the open ocean. Co biogeochemistry within estuaries and on continental shelves is complex (Chen et al., 2023; de Carvalho et al., 2021), but the ultimate source of Co is the weathering of silicate rocks, which appears to have varied little over glacial cycles (Von Blanckenburg et al., 2015). Aeolian deposition, constrained by dust reconstructions in these cores (Costa et al., 2016; Jacobel et al., 2017), provides <10% of the authigenic Co flux (Figure S5 in Supporting Information ).…”

Ocean circulation and biological processes drive seasonal variations of dissolved Al, Cd, Ni, Cu, and Zn on the Northeast Atlantic continental margin

“…The shelf sea carbon pump subsequently transfers the captured carbon to the open ocean (Thomas et al, 2004). The Northeast (NE) Atlantic continental margin (Celtic Sea) is a typical temperate shelf sea and is representative for such systems globally because of its enhanced and seasonal primary productivity, seasonal co-limitation of phytoplankton growth by nitrate and Fe (Birchill et al, 2017), seasonal stratification, and occurrence of both fluvial and benthic inputs of redox sensitive TMs (including Fe and Mn) (Chen et al, 2023). Here, we report the seasonal distributions of dTMs (with focus on dCd, dCu, dNi, and dZn) and nutrients on the NE Atlantic continental margin, which is characterized by large seasonal variations in biological productivity (Birchill et al, 2017), complex bathymetry and dynamic water circulation (Fig.…”