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Title: Water column characterisation on the Azores platform and at the sea mounts south of the archipelago
Author: Palma, Carla
Lillebø, Ana I.
Borges, Carlos
Souto, Miguel
Pereira, Eduarda
Duarte, Armando C.
Abreu, Manuel Pinto de
Keywords: Deep sea
Atlantic region of the Azores
Water masses
Potential toxic elements
Background concentrations
Issue Date: Sep-2012
Publisher: Elsevier
Abstract: 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.
Peer review: yes
DOI: 10.1016/j.marpolbul.2012.06.015
ISSN: 0025-326X
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