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Título

Modelling nutrients and chlorophyll a time series in an estuarine upwelling ecosystem (Ria de Vigo: NW Spain) using the Box-Jenkins approach

AutorNogueira, Enrique CSIC ORCID CVN; Pérez, Fiz F. CSIC ORCID ; Ríos, Aida F. CSIC
Palabras claveNutrients
Weather-induced forching
Time series
Univariate models
Transfer function-noise models
Ria de Vigo
Spanish coast
Fecha de publicación1998
EditorAcademic Press
CitaciónEstuarine, Coastal and Shelf Science 46(2): 267-286 (1998)
ResumenHydrographic variables were monitored twice weekly at a fixed station in the Ría de Vigo (NW Spain) from 1987. In this work, the behaviour of nutrients and chlorophyll a in response to external forcing has been analysed. To achieve this objective, the time course of nutrients and chlorophyll a has been investigated through the Box–Jenkins approach, by means of both univariate and transfer function–noise (TFN) models. Meteorological and thermohaline variables were used to characterize the external forcing in the building of TFN models. Nutrients in the Ría de Vigo can be grouped into different categories depending on the factors which control their behaviour. Surface NO3-, DIN and Si(OH)4, and bottom NH4+, NO3-, and DIN are strongly influenced by external factors such as runoff and/or upwelling–downwelling events. Surface NH4+ and HPO42- are clearly under internal control, i.e. biologically mediated processes operating at lower time-scales which override the larger scale hydrodynamic (or weather-induced) forcing. Bottom HPO42- and Si(OH)4 are under both internal and external control. Box–Jenkins methods applied in this work are conceptually too simple to model the complex behaviour of phytoplankton biomass. However, modelling chlorophyll a using this approach may be a valuable tool to focus our attention on situations when large fluctuations of phytoplankton biomass occur
Descripción20 páginas, 15 figuras, 4 tablas
Versión del editorhttp://dx.doi.org/10.1006/ecss.1997.0266
URIhttp://hdl.handle.net/10261/58086
DOI10.1006/ecss.1997.0266
ISSN0272-7714
E-ISSN1096-0015
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