@article{fdi:010066086,
  title = {{C}entennial to millennial-scale changes in oxygenation and productivity in the {E}astern {T}ropical {S}outh {P}acific during the last 25,000 years},
  author = {{S}alvatteci, {R}. and {G}utierrez, {D}. and {S}ifeddine, {A}bdelfettah and {O}rtlieb, {L}uc and {D}ruffel, {E}. and {B}oussafir, {M}. and {S}chneider, {R}.},
  editor = {},
  language = {{ENG}},
  abstract = {{O}xygen minimum zones ({OMZ}) have expanded in all tropical oceans during the last 50 years resulting in habitat contraction and considerable changes in marine biogeochemistry. {H}owever, for a better understanding of the {OMZ} dynamics under the current climate change, two questions are relevant: 1) how do the magnitude and temporal changes in oceanic dissolved oxygen of the last few decades compare to the natural variability on longer timescales, and 2) what were the local and remote factors driving {OMZ} changes in the past. {I}n the present study we use a stacked record covering the last 25 kyr from the {E}astern {T}ropical {S}outh {P}acific ({ETSP}) {OMZ} to reconstruct changes in oxygenation and productivity. {W}e use a suite of proxies including the presence of laminations, redox sensitive metals ({U}, {M}o, {R}e, {N}i and {C}u), total organic carbon and delta {N}-15 measurements. {W}ater column denitrification and sediment redox conditions show pronounced centennial to millennial-scale variability during the last 25 kyr, with oxygenation levels as low as at present {G}lobal cold periods at different timescales such as the {L}ast {G}lacial {M}aximum (23-19 kyr {BP}) and the {L}ittle {I}ce {A}ge (1500-1850 {AD}) were associated with a weak {OMZ} and low export production, while warm intervals such as the deglaciation, part of the {M}edieval {C}limate {A}nomaly and the last 100 years are associated with a stronger {OMZ} and high export production. {W}ater column denitrification and sediment redox conditions were strongly coupled during the last 25 kyr {BP} apart from one remarkable exception: during the {A}ntarctic {C}old {R}eversal, sediments were less reducing but the water column denitrification was high resulting in a strong but shallow {OMZ}. {T}his may have been produced by an enhanced {A}ntarctic {I}ntermediate {W}ater flow. {C}ontrary to our expectations and modeling predictions for the next few decades, we observe a weak {ETSP}-{OMZ} during the warm mid-{H}olocene, which may have been the result of a stronger {W}alker {C}irculation that brought oxygen-rich waters to intermediate depths off {P}eru via {E}quatorial undercurrents. {I}n combination with other paleoceanographic reconstructions, our results show that oxygenation variability in the {ETSP}-{OMZ} was influenced by ocean circulation changes in the {T}ropical {P}acific, high latitude oceanographic and climatic changes, and local productivity.},
  keywords = {{R}edox sensitive metals ; {D}enitrification ; {O}xygen minimum zone ; {P}eruvian ; upwelling ecosystem ; {P}aleoceanography ; {PACIFIQUE} {SUD} ; {PEROU} ; {ZONE} {TROPICALE}},
  booktitle = {},
  journal = {{Q}uaternary {S}cience {R}eviews},
  volume = {131},
  numero = {{A}},
  pages = {102--117},
  ISSN = {0277-3791},
  year = {2016},
  DOI = {10.1016/j.quascirev.2015.10.044},
  URL = {https://www.documentation.ird.fr/hor/fdi:010066086},
}