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Metals content in surface waters of an upwelling system of the northern Humboldt Current (Mejillones Bay, Chile)

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Valdés, Jorge and Román, Domingo and Álvarez Galindo, Gabriel and Ortlieb, Luc and Guiñez, Marcos (2008) Metals content in surface waters of an upwelling system of the northern Humboldt Current (Mejillones Bay, Chile). Journal of marine systems, 71 (1-fe). pp. 18-30. ISSN 0924-7963

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Official URL: http://dx.doi.org/10.1016/j.jmarsys.2007.05.006




Abstract

Physical-chemical parameters (temperature, salinity, dissolved oxygen, nutrients, and chlorophyll concentration) of surface waters were used to evaluate the influence of biological and physical processes over the metal concentrations (Cd, Ni, V, Mo, Mn, and Fe) in different periods of a normal annual cycle (June 2002 and April 2003), in Mejillones Bay (23 degrees S), one of northern Chile's strongest upwelling cells. Two points were sampled every 2 months, but statistical analysis of these parameters did not show any spatial differences in surface water composition (annual average) in this bay. The order of total and dissolved metals by abundance (annual mean) in the Mejillones Bay surface waters during the sampling period was Cd < Ni < Mn < Fe < V < Mo. The surface concentration of metals does not appear to be explained by anthropogenic inputs (at least not during the year of this work), and variability observed in this study appears to be natural. The lack of correlation between physical-chemical parameters and metals could indicate a more complex combination of factors acting on surface concentrations. Moreover, the mixture of water masses and the Oxygen Minimum Zone which characterizes the Mejillones bay should have an important influence on surface distribution of trace metals and can explain the high temporal variability observed in most of the metals analyzed in this work. A two-box conceptual model is proposed to suggest possible influences on metals in surface waters of this coastal ecosystem. (c) 2007 Elsevier B.V. All rights reserved.


Item Type:Article
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©2007 Elsevier B.V.
This study was supported by grant PEI 1340-02, from the Universidad de Antofagasta, Chile, and UR 055 PALEOTROPIQUE, IRD, France. Support was also provided by IRD through the JEAI (Jeune Equipe Associée à l'IRD) program. We thank Freddy Rabasté and Keyla Majluf for their help in sampling and analytical support in nutrient and chlorophyll determinations. Special thanks to anonymous reviewers for their comments and significantly improving the manuscript.

Uncontrolled Keywords:Trace metals; Upwelling; Humboldt system; Marine surface water
Subjects:Sciences > Physics > Physics-Mathematical models
Sciences > Physics > Mathematical physics
ID Code:32731
Deposited On:30 Jul 2015 12:12
Last Modified:10 Dec 2018 15:09

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