Interactions Between the Subtidal Variability of an Upwelling Front and Wind Stress in the Midriff Archipelago Region of the Gulf of California Using Remote Sensors.

The front variability is controlled by the physical process that produces it and the biological processes are influenced by this seasonal variability. The objective of this study is to identify the interaction between the subtidal variability of the upwelling front and the wind stress in the Midriff Archipelago Region of the Gulf of California during 2017 using remote sensing. The SST and Chlorophyll satellite data, sea level data, magnitude and direction data of the wind, in the archipelago of the Gulf of California or the Midriff Island Zone are using. The SST and chlorophyll daily data were used to see the fortnightly variability in 2017 related to the neap and spring tidal cycle. The identity of the upper ocean front was done following the Belkin and O’Reilly (2009) methodology and using the daily SST and chlorophyll data. This upwelling front is produced by the strong thermohaline interaction between the upwelling waters and the water from the southern part of the Gulf of California. The upwelling front variability follows the spring and neap tide cycle. During the spring tide the front is more intense and larger; it extends almost to the continental coast, because during the spring tide the upwelling is at maximum. In the neap tide the upwelling front is retracted to close to the peninsula coast and it is less intense, because the upwelling is minimal. In summer and autumn, the wind stress plays an important role in the upwelling intensity, if the wind from the east matches with the spring tide, the front is larger and stronger. In winter and spring, without wind from the east, the upwelling is less and the front will be retracted to close to the peninsula and the upwelling front is controlled only by the spring and neap tide cycles.