A method based on satellite imagery to identify spatial units for eutrophication management
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AuthorsMercado-Carmona, J.M. (Jesús Mariano); Gómez-Jakobsen, F.J. (Francisco José); Yebra, L. (Lidia); Salles, S. (Soluna); León, P. (Pablo); Putzeys, S.
A procedure based on analysis of time series of MODIS-Aqua satellite chlorophyll a images was developed in order to spatially delimit areas of the Alboran Sea with distinguishable annual cycles of productivity. For this objective, daily images of satellite chlorophyll were obtained from 2002 to 2013. Monthly means were calculated for each pixel and then the pixels were grouped by means of the statistical technique of non-hierarchical clustering analysis according to the features of their annual cycle. The outcome of the clustering analysis was validated by comparing the pixel grouping patterns with the spatial distribution of in situ chlorophyll a and nutrients as determined from the available data (about 2,900 registers obtained in the 20 m upper seawater layer in 70 sampling stations). Six grouping areas were identified which reproduced the expected zonation according to the distribution of the main mesoscale hydrological structures that modulate the productivity in the study area ...
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