The Great Islands zone, in the Gulf of California, presents high phytoplankton concentration as a result of the high
Turbulent Kinetic Energy (TKE). In this work we looked for dynamics zones based on Empirical Orthogonal Function
analysis (EOF). The input data were Sea Surface Temperature (SST) and Chlorophyll-a concentration (Chla) from daily
MODIS-AQUA at 1 Km from 2003 to 2006. Time series were generated to define the average conditions for summer
and winter spring tides. Results showed that in general and during summer-spring tides, higher Chla concentrations are
localized in the west coast, with a displacement to the south. These high Chla were associated with tidal mixing. Zero
EOF values in summer showed the boundary between low SST and high Chla. During winter-spring tides there were
more spatial variability than during summer time. Zero EOF value in winter time showed low SST and Chla in the west
coast due to stronger mixing conditions that stay longer. Results of this work emphasize that a dynamic regionalization
can be used in high TKE areas and it helps to define zones with a similar response based on the input parameters chosen.
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