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Variabilidad estacional de la clorofila a y su respuesta a condiciones El Niño y La Niña en el Norte del Golfo de California

2013; University of Valparaíso; Volume: 48; Issue: 1 Linguagem: Inglês

10.4067/s0718-19572013000100011

0718-1957

Esteban M Pérez-Arvizu, E. Alberto Aragón-Noriega, T. Leticia Espinosa-Carreón,

Water Quality Monitoring and Analysis

In order to determinate the seasonal variability concentrations of chlorophyll-a (Clo-a) derived from satellite observations, and their responses to El Niño and La Niña conditions in the northern Gulf of California (NGC), we used monthly sea color composites from January 1997 to December 2011 from the OCTS and SeaWiFS sensor.The Clo-a seasonality indicate in winter-spring maxima and summer-autumn minimum, with a predominance of the annual signal During El Niño 1997-1998 Clo-a showed low concentrations.During El Niño 2002-2003 the Clo-a show low influence.In La Niña 2007 Cloa response was positive with high values.In 2011 where registered the highest Clo-a concentration of the entire study period, as result of La Niña phase.From 2003 to 2007 conditions were considered 'normal' in the system.The average pattern of time series suggests that NGC is eutrophic and the interannual variability of Chl-a is influenced by adjacent Pacific Ocean forcing, suggested by a significant inverse relationship of Chl-a and the Multivariate ENOA index (MEI; ENOA: El Niño Austral Oscillation).We propose that shifts from a strong El Niño (1997)(1998) to La Niña conditions (1999), the phytoplankton biomass response was low because a great oceanography conditions changes (wind, stability, etc.), however with the shifts from El Niño weak (2009)(2010) to La Niña (2011), these conditions represent less stress with a suitable phytoplankton response and the biomass increases.