Articles | Volume 14, issue 20
https://doi.org/10.5194/bg-14-4601-2017
https://doi.org/10.5194/bg-14-4601-2017
Research article
 | 
19 Oct 2017
Research article |  | 19 Oct 2017

The OMZ and nutrient features as a signature of interannual and low-frequency variability in the Peruvian upwelling system

Michelle I. Graco, Sara Purca, Boris Dewitte, Carmen G. Castro, Octavio Morón, Jesús Ledesma, Georgina Flores, and Dimitri Gutiérrez

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The Peruvian coastal upwelling ecosystem is a natural laboratory to study climatic variability and climate change. We examined the variability in the OMZ in the last decades in connection with the equatorial Pacific strong 1997–1998 El Niño event and the influence of central Pacific El Niño events and enhanced equatorial Kelvin wave activity since 2000. The data reveal two contrasting regimes and a long-term trend corresponding to a deepening of the oxygen-deficient waters and warming.
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