Articles | Volume 15, issue 23
https://doi.org/10.5194/bg-15-7111-2018
https://doi.org/10.5194/bg-15-7111-2018
Research article
 | 
29 Nov 2018
Research article |  | 29 Nov 2018

Pacific Decadal Oscillation and recent oxygen decline in the eastern tropical Pacific Ocean

Olaf Duteil, Andreas Oschlies, and Claus W. Böning

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Cited articles

Albert, A., Echevin, V., Levy, M., and Aumont, O.: Impact of nearshore wind stress curl on coastal circulation and primary productivity in the Peru upwelling system, J. Geophys. Res., 115, C12033, https://doi.org/10.1029/2010JC006569, 2010. 
Bettencourt, J. H., López, C., Hernández-Garcia, E., Montes, I., Sudre, J., Dewitte, B., Paulmier, A., and Garçon, V.: Boundaries of the Peruvian Oxygen Minimum Zone shaped by coherent mesoscale dynamics, Nature Geosci., 8, 937–940, https://doi.org/10.1038/ngeo2570, 2015. 
Bopp, L., Resplandy, L., Orr, J. C., Doney, S. C., Dunne, J. P., Gehlen, M., Halloran, P., Heinze, C., Ilyina, T., Séférian, R., Tjiputra, J., and Vichi, M.: Multiple stressors of ocean ecosystems in the 21st century: projections with CMIP5 models, Biogeosciences, 10, 6225–6245, https://doi.org/10.5194/bg-10-6225-2013, 2013. 
Bianchi, D., Galbraith, E. D., Carozza, D. A., Mislan, K. A. S., and Stock, C. A.: Intensification of open-ocean oxygen depletion by vertically migrating animals, Nature Geosci., 6, 545–548, 2013. 
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Short summary
Oxygen-depleted regions of the Pacific Ocean are currently expanding, which is threatening marine habitats. Based on numerical simulations, we show that the decrease in the intensity of the trade winds and the subsequent slowdown of the oceanic currents lead to a reduction in oxygen supply. Our study suggests that the prevailing positive conditions of the Pacific Decadal Oscillation since 1975, a major source of natural variability, may explain a significant part of the current deoxygenation.
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