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Salvatteci, Renato (2018): Redox sensitive metals, d15N, hydrogen index and TOC measured on a composite record (B14-G10-G14) off Peru covering the last 25 kyr. PANGAEA,, Supplement to: Salvatteci, Renato; Gutièrrez, Dimitri; Sifeddine, Abdelfettah; Ortlieb, Luc; Druffel, Ellen RM; Boussafir, Mohammed; Schneider, Ralph R (2016): Centennial to millennial-scale changes in oxygenation and productivity in the Eastern Tropical South Pacific during the last 25,000 years. Quaternary Science Reviews, 131, 102-117,

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Oxygen minimum zones (OMZ) have expanded in all tropical oceans during the last 50 years resulting in habitat contraction and considerable changes in marine biogeochemistry. However, 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. In the present study we use a stacked record covering the last 25 kyr from the Eastern Tropical South Pacific (ETSP) OMZ to reconstruct changes in oxygenation and productivity. We use a suite of proxies including the presence of laminations, redox sensitive metals (U, Mo, Re, Ni and Cu), total organic carbon and d15N measurements. Water 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. Global cold periods at different timescales such as the Last Glacial Maximum (23e19 kyr BP) and the Little Ice Age (1500e1850 AD) were associated with a weak OMZ and low export production, while warm intervals such as the deglaciation, part of the Medieval Climate Anomaly and the last 100 years are associated with a stronger OMZ and high export production. Water column denitrification and sediment redox conditions were strongly coupled during the last 25 kyr BP apart from one remarkable exception: during the Antarctic Cold Reversal, sediments were less reducing but the water column denitrification was high resulting in a strong but shallow OMZ. This may have been produced by an enhanced Antarctic Intermediate Water flow. Contrary to our expectations and modeling predictions for the next few decades, we observe a weak ETSP-OMZ during the warm mid-Holocene, which may have been the result of a stronger Walker Circulation that brought oxygen-rich waters to intermediate depths off Peru via Equatorial undercurrents. In combination with other paleoceanographic reconstructions, our results show that oxygenation variability in the ETSP-OMZ was influenced by ocean circulation changes in the Tropical Pacific, high latitude oceanographic and climatic changes, and local productivity.
German Science Foundation (DFG), grant/award no. 27542298: Climate - Biogeochemistry Interactions in the Tropical Ocean
Median Latitude: -14.348667 * Median Longitude: -76.417667 * South-bound Latitude: -14.392000 * West-bound Longitude: -76.430000 * North-bound Latitude: -14.270000 * East-bound Longitude: -76.398000
Minimum Elevation: -396.0 m * Maximum Elevation: -301.0 m
B14_MUC * Latitude: -14.270000 * Longitude: -76.430000 * Elevation: -301.0 m * Method/Device: Core (CORE) * Comment: Paleo-3 cruise in 2005
G-10-GC-02 * Latitude: -14.384000 * Longitude: -76.398000 * Elevation: -312.0 m * Campaign: Galathea 3 * Basis: HDMS Vaedderen * Method/Device: Gravity corer (GC)
G-14-GC-06 * Latitude: -14.392000 * Longitude: -76.425000 * Elevation: -396.0 m * Campaign: Galathea 3 * Basis: HDMS Vaedderen * Method/Device: Gravity corer (GC)
#NameShort NameUnitPrincipal InvestigatorMethod/DeviceComment
1Event labelEventSalvatteci, Renato
2Latitude of eventLatitudeSalvatteci, Renato
3Longitude of eventLongitudeSalvatteci, Renato
4Elevation of eventElevationmSalvatteci, Renato
5Sample code/labelSample labelSalvatteci, Renato
6AGEAgeka BPSalvatteci, RenatoGeocode
7PeriodPeriodSalvatteci, Renato
8Carbon, organic, totalTOC%Salvatteci, Renato
9Hydrogen index, mass HC per unit mass total organic carbonHI, HC/TOCmg/gSalvatteci, Renato
10δ15Nδ15N‰ airSalvatteci, Renato
11AluminiumAl%Salvatteci, Renato
12Nickel excessNi xsmg/kgSalvatteci, Renato
13Copper excessCu xsmg/kgSalvatteci, Renato
14Molybdenum excessMo xsmg/kgSalvatteci, Renato
15Uranium excessU xsmg/kgSalvatteci, Renato
16Rhenium excessRe xsµg/kgSalvatteci, Renato
17Carbon, organic, total/Aluminium ratioTOC/AlSalvatteci, Renato
18Molybdenum/Uranium ratioMo/USalvatteci, Renato
19Rhenium/molybdenum ratioRe/MoSalvatteci, Renato
20Enrichment factorEFSalvatteci, RenatoNi
21Enrichment factorEFSalvatteci, RenatoCu
22Enrichment factorEFSalvatteci, RenatoMo
23Enrichment factorEFSalvatteci, RenatoU
24Enrichment factorEFSalvatteci, RenatoRe
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