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Discussion papers
https://doi.org/10.5194/os-2019-93
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/os-2019-93
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 05 Aug 2019

Submitted as: research article | 05 Aug 2019

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This discussion paper is a preprint. It is a manuscript under review for the journal Ocean Science (OS).

Influence of intraseasonal eastern boundary circulation variability on hydrography and biogeochemistry off Peru

Jan Lüdke1, Marcus Dengler1, Stefan Sommer1, David Clemens1, Sören Thomsen2, Gerd Krahmann1, Andrew W. Dale1, Eric P. Achterberg1,3, and Martin Visbeck1,3 Jan Lüdke et al.
  • 1GEOMAR Helmholtz Centre for Ocean Research Kiel, Düsternbrooker Weg 20, 24105 Kiel, Germany
  • 2LOCEAN-IPSL, IRD/CNRS/Sorbonnes Universites (UPMC)/MNHN, UMR 7159, Paris, France
  • 3Kiel University, Kiel, Germany

Abstract. The Peruvian Upwelling System is characterized by high primary productivity fuelled by the supply of nutrients in a highly dynamic boundary circulation. The intraseasonal evolution of the physical and biogeochemical properties is analysed based on shipboard observations and remote sensing conducted between April and June 2017 off central Peru. The poleward transport in the subsurface Peru Chile Undercurrent was highly variable and strongly intensified between mid and end of May. This intensification was likely caused by a first baroclinic mode downwelling coastal trapped wave excited at the equator at about 95° W that propagated poleward along the South American coast. The intensified poleward flow shortens the time of water mass advection from the equatorial current system to the study site. The impact of the anomalous advection is mostly noticed in the nitrogen cycle because during the shorter time needed for poleward advection less fixed nitrogen loss occurs within the waters. This causes a strong increase of nitrate concentrations and a decrease in the nitrogen deficit. These changes suggest that the advection caused by the coastal trapped wave supersedes the simultaneous effect of anomalous downwelling in terms of nutrient response.

Jan Lüdke et al.
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Influence of intraseasonal eastern boundary circulation variability on hydrography and biogeochemistry off Peru Lüdke, Jan; Dengler, Marcus; Sommer, Stefan; Clemens, David; Thomsen, Soeren; Krahmann, Gerd; Dale, Andrew W; Achterberg, Eric Pieter; Visbeck, Martin https://doi.pangaea.de/10.1594/PANGAEA.903828

Jan Lüdke et al.
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Short summary
We describe the intraseasonal variability of the alongshore circulation off Peru in early 2017, this circulation is very important for the supply of nutrients to the upwelling regime. The causes of this variability and its impact on the biogeochemistry are analysed. The poleward flow is strengthened during the observed time period, likely by a downwelling coastal trapped wave, the stronger current cause an increase in nitrate and reduces the deficit of fixed nitrogen.
We describe the intraseasonal variability of the alongshore circulation off Peru in early 2017,...
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