Please use this identifier to cite or link to this item:
Title: Rare earth elements and Nd isotopes as tracers of modern ocean circulation in the central Mediterranean Sea
Author: Garcia Solsona, Ester
Pena González, Leopoldo David
Paredes, Eduardo
Pérez-Asensio, José N. (José Noel)
Quirós Collazos, Lucía
Lirer, Fabrizio
Cacho Lascorz, Isabel
Keywords: Mediterrània (Mar)
Mediterranean Sea
Issue Date: 30-Apr-2020
Publisher: Elsevier
Abstract: Seawater rare earth element (REE) concentrations and Nd isotopic composition (εNd) are increasingly applied as valuable tracers of oceanographic processes such as water mass mixing and lithogenic inputs to seawater. However, their measurements are basically lacking in the Mediterranean Sea water column. This study analyzes 9 seawater stations around the central Mediterranean Sea to clarify the relative importance of external sources, vertical (biogeochemical) processes and lateral water mass transport in controlling REE and εNd distributions. Concentrations of REE do not show nutrient-like profiles with depth, likely indicative of relatively young waters with limited accumulation of remineralized REE. Light REE (LREE) present a non-conservative behavior, which largely peak at surface waters and rapidly decrease with depth. The negative correlation of surface LREE enrichment with offshore distance highlights the influence of continental input from the western Italian coast to the Tyrrhenian surface waters. In contrast to other regions with reported boundary exchange, this process does not modify the εNd values here. On the other side, distributions of dissolved heavy REE (HREE) and εNd display a conservative behavior that can be explained by mixing of western- (MAW and WMDW) and eastern- (LIW and EMDW) originated waters. We test this hypothesis with an Optimum Multi-Parameter Analysis (OMPA) including HREE and εNd parameters. Even though the limited data set, consistent results of water mass fractions are obtained for the four main water masses although with some particularities. While LIW takes on major importance when considering HREE in the model, EMDW fractions are preferentially detected with εNd. This latter finding implies a noticeable deep water flux across the Sicily Strait into the Western Mediterranean that was not clearly evidenced before.
Note: Reproducció del document publicat a:
It is part of: Progress in Oceanography, 2020, vol. 185
Related resource:
ISSN: 0079-6611
Appears in Collections:Articles publicats en revistes (Dinàmica de la Terra i l'Oceà)

Files in This Item:
File Description SizeFormat 
703533.pdf4.79 MBAdobe PDFView/Open

This item is licensed under a Creative Commons License Creative Commons