Controls on the Distributions of Dissolved Cd, Cu, Zn, and Cu‐Binding Organic Ligands in the East China Sea

Abstract

Trace metals such as Cd, Cu, and Zn are important micronutrients for phytoplankton (Morel et al., 2003), and their vertical distributions typically reflect their biogeochemical involvements in the ocean (Bruland & Lohan, 2003). Dissolved Cd and Zn exhibit "nutrient-type" profiles, in which biological uptake results in low concentrations in the biologically productive surface and subsurface waters, and subsequent remineralization of sinking particles rapidly increases their concentrations in the intermediate and deep waters below the nutricline (

Very strong but exchangeable organic ligand of cobalt in the marginal sea

“…Water masses at Sta. F1 were divided into Kuroshio surface water, Kuroshio tropical water, Kuroshio intermediate water, Okinawa Trough intermediate water, and Okinawa Trough deep water according to Wong et al (2021).…”

“…The low salinity waters observed at Sta. G3 had salinity of 33.74, which can be defined as Shelf Mixed Water, derived from the mixing of Changjiang Diluted Water and the Kuroshio Surface Water (Wong et al 2021).…”

“…5). This water mass corresponds to the Kuroshio Intermediate Water (Wong et al 2021). Wong et al revealed that dissolved Cd, Cu, and Zn also correlated positively with phosphate (and negatively with DO concentration) at these depths, similar to dCo.…”

“…We observed five distinct water masses at Sta. F1 and defined them accordingly based on the definition by Wong et al (2021) (Fig. 2).…”

“…In the intermediate waters, both temperature and salinity decreased with depth. This water mass is the Kuroshio Intermediate Water and is derived from the intermediate waters of the West Philippine Sea and South China Sea (Wong et al 2021). A salinity minimum (34.33) was observed in the lower intermediate depths of Sta.…”