Articles | Volume 16, issue 6
https://doi.org/10.5194/os-16-1347-2020
https://doi.org/10.5194/os-16-1347-2020
Research article
 | 
09 Nov 2020
Research article |  | 09 Nov 2020

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

Jan Lüdke, Marcus Dengler, Stefan Sommer, David Clemens, Sören Thomsen, Gerd Krahmann, Andrew W. Dale, Eric P. Achterberg, and Martin Visbeck

Related authors

Effects of 238U variability and physical transport on water column 234Th downward fluxes in the coastal upwelling system off Peru
Ruifang C. Xie, Frédéric A. C. Le Moigne, Insa Rapp, Jan Lüdke, Beat Gasser, Marcus Dengler, Volker Liebetrau, and Eric P. Achterberg
Biogeosciences, 17, 4919–4936, https://doi.org/10.5194/bg-17-4919-2020,https://doi.org/10.5194/bg-17-4919-2020, 2020
Short summary
Bacterial degradation activity in the eastern tropical South Pacific oxygen minimum zone
Marie Maßmig, Jan Lüdke, Gerd Krahmann, and Anja Engel
Biogeosciences, 17, 215–230, https://doi.org/10.5194/bg-17-215-2020,https://doi.org/10.5194/bg-17-215-2020, 2020
Short summary
Controls on redox-sensitive trace metals in the Mauritanian oxygen minimum zone
Insa Rapp, Christian Schlosser, Jan-Lukas Menzel Barraqueta, Bernhard Wenzel, Jan Lüdke, Jan Scholten, Beat Gasser, Patrick Reichert, Martha Gledhill, Marcus Dengler, and Eric P. Achterberg
Biogeosciences, 16, 4157–4182, https://doi.org/10.5194/bg-16-4157-2019,https://doi.org/10.5194/bg-16-4157-2019, 2019
Short summary
Diapycnal dissolved organic matter supply into the upper Peruvian oxycline
Alexandra N. Loginova, Sören Thomsen, Marcus Dengler, Jan Lüdke, and Anja Engel
Biogeosciences, 16, 2033–2047, https://doi.org/10.5194/bg-16-2033-2019,https://doi.org/10.5194/bg-16-2033-2019, 2019
Short summary

Related subject area

Approach: In situ Observations | Depth range: Thermocline | Geographical range: Deep Seas: South Pacific | Phenomena: Temperature, Salinity and Density Fields
Transport, properties, and life cycles of mesoscale eddies in the eastern tropical South Pacific
Rena Czeschel, Florian Schütte, Robert A. Weller, and Lothar Stramma
Ocean Sci., 14, 731–750, https://doi.org/10.5194/os-14-731-2018,https://doi.org/10.5194/os-14-731-2018, 2018
Short summary
Observed El Niño conditions in the eastern tropical Pacific in October 2015
Lothar Stramma, Tim Fischer, Damian S. Grundle, Gerd Krahmann, Hermann W. Bange, and Christa A. Marandino
Ocean Sci., 12, 861–873, https://doi.org/10.5194/os-12-861-2016,https://doi.org/10.5194/os-12-861-2016, 2016
Short summary

Cited articles

Albert, A., Echevin, V., Lévy, M., and Aumont, O.: Impact of nearshore wind stress curl on coastal circulation and primary productivity in the Peru upwelling system, J. Geophys. Res.-Oceans, 115, C12033, https://doi.org/10.1029/2010JC006569, 2010. 
Bachèlery, M.-L., Illig, S., and Dadou, I.: Forcings of nutrient, oxygen, and primary production interannual variability in the southeast Atlantic Ocean, Geophys. Res. Lett., 43, 8617–8625, https://doi.org/10.1002/2016gl070288, 2016. 
Bakun, A. and Nelson, C. S.: The Seasonal Cycle of Wind-Stress Curl in Subtropical Eastern Boundary Current Regions, J. Phys. Oceanogr., 21, 1815–1834, https://doi.org/10.1175/1520-0485(1991)021<1815:TSCOWS>2.0.CO;2, 1991. 
Belmadani, A., Echevin, V., Dewitte, B., and Colas, F.: Equatorially forced intraseasonal propagations along the Peru-Chile coast and their relation with the nearshore eddy activity in 1992–2000: A modeling study, J. Geophys. Res.-Oceans, 117, C04025, https://doi.org/10.1029/2011JC007848, 2012. 
Download
Short summary
We analyse 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 investigated. The poleward flow is strengthened during the observed time period, likely by a downwelling coastal trapped wave. The stronger current causes an increase in nitrate and reduces the deficit of fixed nitrogen relative to phosphorus.