Articles | Volume 11, issue 3
Research article
22 Jun 2015
Research article |  | 22 Jun 2015

Circulation, eddies, oxygen, and nutrient changes in the eastern tropical South Pacific Ocean

R. Czeschel, L. Stramma, R. A. Weller, and T. Fischer

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Cited articles

Anderson, L. A.: On the hydrogen and oxygen content of marine phytoplankton, Deep-Sea Res. I, 42, 1675–1680, 1995.
Ayon, P., Criales-Hernandez, M. I., Schwamborn, R., and Hirche, H.-J.: Zooplankton research off Peru: A review, Prog. Oceanogr., 79, 238–255, 2008.
Behrenfeld, M. J., Boss, E., Siegel, D. A., and Shea, D. M.: Carbon-based ocean productivity and phytoplankton physiology from space, Global Biogeochem. Cy., 19,, 2005.
Bograd, S. J., Pozo Buil, M., Di Lorenzo, E., Castro, C. G., Schroeder, I. D., Goericke, R., Anderson, C. R., Benitez-Nelson, C., and Whitney, F. A.: Changes in source waters to the Southern California Bight, Deep-Sea Res. II, 112, 42–52,, 2015.
Chaigneau, A., Gizolme, A., and Grados, C.: Mesoscale eddies off Peru in altimeter records: Identification algorithms and eddy spatio-temporal patterns, Prog. Oceanogr., 79, 106–119, 2008.
Short summary
Mean circulation in the eastern tropical South Pacific in 50-600m depth is modified by seasonal variability and eddies on the poleward side of the oxygen minimum zone(OMZ). Floats with parking depth at 400m show westward flow in the equatorial channel, sluggish flow in the northern part of the OMZ, and passage of eddies with oxygen anomalies. Net community production rates were estimated from a float. Oxygen decrease in 50-300m depth since 1976 is related to an increase in nitrate and phosphate.