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

Chen, Xue-Gang, Rusiecka, Dagmara, Gledhill, Martha , Milne, Angela, Annett, Amber L., Birchill, Antony J., Lohan, Maeve C., Ussher, Simon, Woodward, E. Malcolm S. and Achterberg, Eric Pieter (2023) Ocean circulation and biological processes drive seasonal variations of dissolved Al, Cd, Ni, Cu, and Zn on the Northeast Atlantic continental margin. Marine Chemistry . Art.Nr. 104246. DOI 10.1016/j.marchem.2023.104246.

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Abstract

Nutrients and nutrient-like dissolved trace metals (dTMs) are essential for the functioning of marine organisms and therefore form an important part of ocean biogeochemical cycles. Here, we report on the seasonal distributions of dissolved zinc (dZn), nickel (dNi), copper (dCu), cadmium (dCd), aluminum (dAl), and nutrients on the Northeast Atlantic continental margin (Celtic Sea), which is representative for temperate shelf seas globally. Variations in surface water dTM and nutrient concentrations were mainly regulated by seasonal changes in biological processes. The stoichiometry of dTMs (especially for dCu and dZn) and nutrients on the continental shelf was additionally affected by fluvial inputs. Nutrients and dTMs at depth on the continental slope were determined by water mass mixing driven by ocean circulation, without an important role for local remineralization processes. The Mediterranean Outflow Waters are especially important for delivering Mediterranean-sourced dTMs to the Northeast Atlantic Ocean and drive dTM:nutrient kinks at a depth of ~1000 m. These results highlight the importance of riverine inputs, seasonality of primary production and ocean circulation on the distributions of nutrients and nutrient-like dTMs in temperate continental margin seas. Future climate related changes in the forcing factors may impact the availability of nutrients and dTMs to marine organisms in highly productive continental shelf regions and consequently the regional carbon cycle.

Document Type: Article
Funder compliance: DFG: AC 217/4-1
Additional Information: Open research Data are held at the British Oceanographic Data Centre (http://www.bodc.ac.uk/). The data in this study can be achieved by searching “Samples data” filtered by Cruise to “RRS Discovery DY018”, “RRS Discovery DY029”, and “RRS Discovery DY033”.
Keywords: Trace metals; Nutrients; Continental margins; Ocean circulation; Seasonal variations; RRS Discovery
Research affiliation: OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-CH Chemical Oceanography
NOC
OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-CH Chemical Oceanography > FB2-CH Water column biogeochemistry
Main POF Topic: PT6: Marine Life
Refereed: Yes
Open Access Journal?: No
Publisher: Elsevier
Related URLs:
Projects: GEOTRACES
Date Deposited: 24 May 2023 10:21
Last Modified: 07 Feb 2024 15:39
URI: https://oceanrep.geomar.de/id/eprint/58566

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