Water column characterisation on the Azores platform and at the sea mounts south of the archipelago

This study provides data concerning the hydrography and water chemistry of the Atlantic region between 29-38° N and 27-31° W, and establishes background values for dissolved Cu, Cd, Pb and As. Three water masses were identified: the Eastern North Atlantic Central Water (ENACW), the Mediterranean Wat...

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Bibliographic Details
Published in:Marine Pollution Bulletin
Main Authors: Palma, Carla, Lillebø, Ana I., Borges, Carlos, Souto, Miguel, Pereira, Eduarda, Duarte, Armando C., Abreu, Manuel Pinto de
Format: Article in Journal/Newspaper
Language:English
Published: Elsevier 2012
Subjects:
Deep sea
Atlantic region of the Azores
Water masses
Nutrients
Potential toxic elements
Background concentrations
NADW
North Atlantic Deep Water
North Atlantic
Online Access:http://hdl.handle.net/10773/27205
https://doi.org/10.1016/j.marpolbul.2012.06.015
Description
Summary:This study provides data concerning the hydrography and water chemistry of the Atlantic region between 29-38° N and 27-31° W, and establishes background values for dissolved Cu, Cd, Pb and As. Three water masses were identified: the Eastern North Atlantic Central Water (ENACW), the Mediterranean Water (MW) and the North Atlantic Deep Water (NADW). The ENACW exhibits a clear meridional gradient of temperature and salinity, with comparatively high values at the southern sites and lower values on the Azores platform. The ENACW, which includes the euphotic zone, also had comparatively high concentrations of oxygen and lower concentrations of nutrients and metals. The Cu, Cd and Pb results suggest that new background concentrations for OSPAR Region V (the Wider Atlantic) should be established as follows: 0.15-13 nM for Cu, 0.05-1.4 nM for Cd and 0.03-5 nM for Pb. The background concentrations of As for OSPAR Region V should be 7-28 nM. published

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