Dissolved, Labile, and Total Particulate Trace Metal Dynamics on the Northeast Greenland Shelf

We present high-resolution profiles of dissolved, labile, and total particulate trace metals (TMs) on the Northeast Greenland shelf from GEOTRACES cruise GN05 in August 2016. Combined with radium isotopes, stable oxygen noble gas measurements, elemental distributions suggest that TM dynamics were mainly regulated by mixing between North Atlantic-derived Intermediate Water, enriched labile TMs (LpTMs), Arctic surface waters, Siberian shelf-derived dissolved (dTMs; Co, Cu, Fe, Mn, Ni) carried Transpolar Drift. These two distinct sources delineated salinity-dependent variations dTM LpTM concentrations proportion dTMs relative to ratios. Locally produced meltwater Nioghalvfjerdsbræ (79NG) glacier cavity, distinguished other freshwater using helium excess, contributed a large pool inventory. Localized peaks Cd, Ni, Al, V, Ti cavity outflow, however, not directly submarine melting. Instead, these supplied re-suspension sediment particles. Currently, Ocean outflows are most important source dFe, dCu, dNi shelf, while LpTMs up 60% dMn dCo subglacial discharge 79NG cavity. Therefore, changes cavity-overturning induced glacial retreat, alterations transport materials Transport Drift may shift dTM-LpTM stoichiometry future.