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Thomsen, Soeren; Kanzow, Torsten; Krahmann, Gerd; Greatbatch, Richard J; Dengler, Marcus (2016): The formation of a subsurface anticyclonic eddy in the Peru-Chile Undercurrent and its impact on the near-coastal salinity, oxygen and nutrient distributions. PANGAEA, https://doi.org/10.1594/PANGAEA.860727, Supplement to: Thomsen, Soeren; Kanzow, Torsten; Krahmann, Gerd; Greatbatch, Richard J; Dengler, Marcus; Lavik, Gaute (2016): The formation of a subsurface anticyclonic eddy in the Peru-Chile Undercurrent and its impact on the near-coastal salinity, oxygen, and nutrient distributions. Journal of Geophysical Research: Oceans, 121(1), 476-501, https://doi.org/10.1002/2015JC010878

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Abstract:
The formation of a subsurface anticyclonic eddy in the Peru-Chile Undercurrent (PCUC) in January and February 2013 is investigated using a multi-platform four-dimensional observational approach. Research vessel, multiple glider and mooring-based measurements were conducted in the Peruvian upwelling regime near 12°30'S. The dataset consists of more than 10000 glider profiles and repeated vessel-based hydrography and velocity transects. It allows a detailed description of the eddy formation and its impact on the near-coastal salinity, oxygen and nutrient distributions. In early January, a strong PCUC with maximum poleward velocities of ca. 0.25 m/s at 100 to 200 m depth was observed. Starting on January 20 a subsurface anticyclonic eddy developed in the PCUC downstream of a topographic bend, suggesting flow separation as the eddy formation mechanism. The eddy core waters exhibited oxygen concentrations less than 1mol/kg, an elevated nitrogen-deficit of ca. 17µmol/l and potential vorticity close to zero, which seemed to originate from the bottom boundary layer of the continental slope. The eddy-induced across-shelf velocities resulted in an elevated exchange of water masses between the upper continental slope and the open ocean. Small scale salinity and oxygen structures were formed by along-isopycnal stirring and indications of eddy-driven oxygen ventilation of the upper oxygen minimum zone were observed. It is concluded that mesoscale stirring of solutes and the offshore transport of eddy core properties could provide an important coastal open-ocean exchange mechanism with potentially large implications for nutrient budgets and biogeochemical cycling in the oxygen minimum zone off Peru.
Related to:
Dengler, Marcus (2016): Hydrochemistry of water samples during METEOR cruise M92. PANGAEA, https://doi.org/10.1594/PANGAEA.862046
Lavik, Gaute; Krahmann, Gerd (2016): Hydrochemistry of water samples during METEOR cruise M93. PANGAEA, https://doi.org/10.1594/PANGAEA.862055
Coverage:
Median Latitude: -11.116721 * Median Longitude: -77.453517 * South-bound Latitude: -13.969330 * West-bound Longitude: -79.569200 * North-bound Latitude: 8.950900 * East-bound Longitude: -76.418000
Date/Time Start: 2013-01-05T00:00:00 * Date/Time End: 2013-03-09T00:00:00
Size:
14 datasets

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Datasets listed in this publication series

  1. Dengler, M (2016): ADCP current measurements (38 kHz) during METEOR cruise M92. https://doi.org/10.1594/PANGAEA.860718
  2. Dengler, M (2016): ADCP current measurements (38 kHz) during METEOR cruise M93. https://doi.org/10.1594/PANGAEA.860725
  3. Dengler, M (2016): ADCP current measurements (75 kHz) during METEOR cruise M93. https://doi.org/10.1594/PANGAEA.860726
  4. Kanzow, T; Krahmann, G (2018): Physical oceanography from glider mission IFM03_depl09. https://doi.org/10.1594/PANGAEA.887703
  5. Kanzow, T; Krahmann, G (2017): Physical oceanography from glider mission ifm06_depl02 (old version). https://doi.org/10.1594/PANGAEA.884284
  6. Kanzow, T; Krahmann, G (2017): Physical oceanography from glider mission ifm07_depl08 (old version). https://doi.org/10.1594/PANGAEA.884286
  7. Kanzow, T; Krahmann, G (2017): Physical oceanography from glider mission ifm08_depl05 (old version). https://doi.org/10.1594/PANGAEA.884281
  8. Kanzow, T; Krahmann, G (2017): Physical oceanography from glider mission ifm11_depl04 (old version). https://doi.org/10.1594/PANGAEA.884282
  9. Kanzow, T; Krahmann, G (2017): Physical oceanography from glider mission ifm12_depl01 (old version). https://doi.org/10.1594/PANGAEA.884283
  10. Krahmann, G (2016): ADCP current measurements (75 kHz) during METEOR cruise M92. https://doi.org/10.1594/PANGAEA.860717
  11. Krahmann, G (2016): Physical oceanography during METEOR cruise M92. https://doi.org/10.1594/PANGAEA.858070
  12. Krahmann, G (2015): Physical oceanography during METEOR cruise M93. https://doi.org/10.1594/PANGAEA.848017
  13. Krahmann, G (2016): Physical oceanography from glider mission IFM03_depl08 (old version). https://doi.org/10.1594/PANGAEA.860721
  14. Krahmann, G (2016): Physical oceanography from glider mission IFM10_depl03 (old version). https://doi.org/10.1594/PANGAEA.860722