Temporal variability of the physical and chemical water characteristics at a coastal monitoring observatory: Station ENSENADA |
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| Authors: | L Linacre R Durazo JM Hernández-Ayón F Delgadillo-Hinojosa G Cervantes-Díaz JR Lara-Lara V Camacho-Ibar A Siqueiros-Valencia C Bazán-Guzmán |
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| Institution: | 1. Programa de Doctorado en Oceanografía Costera, Facultad de Ciencias Marinas/Instituto de Investigaciones Oceanológicas, Universidad Autónoma de Baja California (UABC), Km 107 Carretera Tijuana-Ensenada, Ensenada CP 22860, Baja California, México;2. Facultad de Ciencias Marinas, UABC, Km 107 Carretera Tijuana-Ensenada, Ensenada CP 22860, Baja California, México;3. Instituto de Investigaciones Oceanológicas, UABC, Km 107 Carretera Tijuana-Ensenada, Ensenada CP 22860, Baja California, México;4. División de Oceanología, Departamento de Oceanografía Biológica, Centro de Investigación Científica y de Educación Superior de Ensenada (CICESE), Km 107 Carretera Tijuana-Ensenada, Ensenada CP 22860, Baja California, México |
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| Abstract: | The temporal variability of the physical and chemical conditions of coastal waters off Ensenada, Baja California (Mexico) was characterized. A historical analysis was made based on 11 years (1998–2008) of temperature and salinity data records measured quarterly by IMECOCAL, along a transect perpendicular to the coast (CalCOFI line 100). Moreover, the physical and chemical conditions at a coastal monitoring observatory called station ENSENADA were described using a 2-year data series (October 2006–November 2008) obtained with improved temporal resolution. The historical analysis of line 100 showed marked seasonal variability in the thermohaline conditions associated with fluctuations in the flow of the equatorward California Current and the poleward California Undercurrent, as well as with coastal upwelling events whose magnitude and frequency increase towards spring–summer. Interannual variability was also observed, related to warm and/or cold ENSO phases that modify the characteristics of the water column in this coastal region. The most striking characteristics of the interannual variability at station ENSENADA were La Niña conditions recorded from summer 2007 to mid 2008. During this cold ENSO phase, temperature, salinity, dissolved oxygen, density, and dissolved inorganic carbon data revealed the anomalous presence of subsurface water at the surface layers in spring 2008. Results suggest that the coastal observatory is sensitive to the temporal variability of hydrographic conditions on shelf coastal waters (<50 km) off Ensenada in the northern BC region. Consequently, station ENSENADA would be a good location to high-frequency monitors the oceanographic conditions of the transitional region between tropical/subtropical and subarctic systems of the California Current System. |
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| Keywords: | Time series Station ENSENADA Temporal variability California current system El Niñ o/La Niñ a Baja California |
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