@article{fdi:010047573,
  title = {{A}noxic sediments off {C}entral {P}eru record interannual to multidecadal changes of climate and upwelling ecosystem during the last two centuries},
  author = {{G}uti{\'e}rrez, {D}. and {S}ifeddine, {A}bdelfettah and {R}eyss, {J}.{L}. and {V}argas, {G}abriel and {V}elazco, {F}. and {S}alvatteci, {R}. and {F}erreira, {V}. and {O}rtlieb, {L}uc and {F}ield, {D}. and {B}aumgartner, {T}. and {B}oussafir, {M}. and {B}oucher, {H}. and {V}aldes, {J}. and {M}arinovic, {L}. and {S}oler, {P}ierre and {T}apia, {P}.},
  editor = {},
  language = {{ENG}},
  abstract = {{H}igh-resolution paleo-environmental and paleoecological archives in laminated sequences are present in selected areas from the upper continental {P}eruvian margin within the oxygen minimum zone. {W}e present initial results of a multidisciplinary study (the {PALEOPECES} project) that aims to reconstruct environmental and ecosystem variability during the past 200 years from high-resolution records. {W}e report chronology development, sediment structure, elemental, organic, and mineralogical compositions of a box core collected at 300m depth off {P}isco, central {P}eru. {A}n average sedimentation rate of 2.2mmy−1 was estimated from downcore excess 210{P}b activities for the last 100-150 years. {E}xtending this rate further downcore indicates that a slump located at 52 cm depth from the top of the core can be correlated with a large tsunami that struck the coast of central {P}eru in 1746. {X}-ray analyses reveal laminated structures composed of couplets of light and dark laminae. {O}bservations under polarized microscope show that light laminae are dominated by more dense, detrital and terrigenous material, while dark laminae are less dense with greater concentrations of amorphous biogenic silica. {D}owncore variations in dry bulk density and {X}-ray radioscopy of gray level show similar patterns, including a major shift at 34 cm depth (ca. mid-nineteenth century). {A} finely laminated sequence, which may include annual varves, is present between 34 cm depth and the slump layer. {S}ediment characteristics of the sequence suggest increased seasonality of terrigenous versus biogenous sedimentation during the corresponding period. {I}n addition to a mid-nineteenth century change and considerable multidecadal variability in {TOC}, there is a positive trend in the past 50 years. {M}ineralogical analyses from a {F}ourier {T}ransformed {I}nfrared {S}pectroscopy ({FTIR}) of the upper core covering the last 25 years, indicate higher concentrations of the mineral fraction (quartz, feldspar, kaolinite and illite) in layers including large {E}l {N}i no events (1982-1983, 1986-1987 and 1997-1998), with the largest peak during the 1997-1998 episode. {T}hese results confirm that anoxic sediments off {P}isco are suitable archives to investigate interannual and decadal changes in oceanographic conditions and climate of the northern {H}umboldt upwelling system.},
  keywords = {{PEROU}},
  booktitle = {},
  journal = {{A}dvances in {G}eosciences},
  volume = {6},
  numero = {},
  pages = {119--125},
  year = {2006},
  URL = {https://www.documentation.ird.fr/hor/fdi:010047573},
}