54 documents found, page 1 of 6
Early Pleistocene (1.94–1.46 Ma) records for the upper mediterranean outflow Wa...
Voelker, Antje; Ducassou, Emanuelle; Balestra, Barbara; Flores, Jose Abel; Acton, Gary D.; Richter, Carl; Xuan, Chuang; Lofi, Johanna; Alberto, AnaThe Mediterranean Outflow Water (MOW), modified by paleoceanographic conditions and tectonic processes, played a significant role in the formation of sediments drifts along the Iberian Margin. Using sediment samples from IODP Hole U1387C, we explore the Early Pleistocene history of the upper MOW core above the central Faro Drift in the Gulf of Cadiz. The time series of benthic foraminifer stable isotope and gra...
Environmental changes at the seafloor of the Faro drift (Gulf of Cadiz) during ...
Silveira Molina, Giulia; Schmiedl, Gerhard; Jiménez-Espejo, Francisco; Kuhnert, Henning; Anica Claro Rodrigues, Teresa Isabel; Voelker, AntjeThis study explores the ecology of the benthic foraminifera fauna and reconstructs bottom water oxygenation, organic matter fluxes, and Mediterranean Outflow Water (MOW) dynamics in the Gulf of Cadiz during the Early to Middle Pleistocene Transition (EMPT) interval of Marine Isotope Stage (MIS) 28 to MIS 19 (1014–761 ka) using high-resolution multiproxy data from IODP Site U1387. Along with benthic foraminifera...
Sea surface temperature variations revealed by planktonic foraminifera at the P...
Mega, Aline; Salgueiro, Emilia; Rebotim, Andreia; Voelker, Antje; Cruz, Joana; Calvo, Eva; Abrantes, FatimaABSTRACT: Global warming, resulting from increasing human emissions of greenhouse gases, is raising ocean temperatures, projecting an increase of 2.6 °C by the end of this century. With the aim of refining climate models and predicting future regional climate conditions more accurately, this study reconstructs sea surface water temperature during the current interglacial period, the Holocene, off the southwest ...
A glycymeris-rich unit as evidence of a late pleistocene tsunami event from NW ...
Doukani, Mohamed Amine; Satour, Linda; Ozer, Caner Kaya; Belkebir, Lahcene; Voelker, Antje; Tedjeddine, Hassane; Landau, Bernard; Uchman, AlfredCompared to the extensive research carried out on the Neogene deposits of the Lower Chelif Basin, the Pleistocene series is still poorly studied, with no detailed lithological succession published to date. This study focuses on the Glycymeris-rich Unit (GRU) along the coastal area of the Hachacha Plateau in Northwestern Algeria. This unit unconformably overlies Miocene, Pliocene, and Pleistocene basements. The ...
Reconstruction of deep-water undercurrent variability from the outer Labrador S...
Kaboth-Bahr, Stefanie; Bahr, André; Blaser, Patrick; Voelker, Antje; Lippold, Jörg; Gutjahr, Marcus; Hodell, David A.; Channell, James E.T.We present a comprehensive multi-proxy analysis spanning 550,000 years from the outer Labrador Sea region at the Integrated Ocean Drilling Program (IODP) Sites U1302/1303. We combine new benthic foraminiferal stable oxygen (delta 18O) and carbon (delta 13C) isotope records, with sediment elemental composition and authigenic neodymium isotope measurements, to provide insights into deep-water mass sourcing and ch...
Technical note: large offsets between different datasets of seawater isotopic c...
Reverdin, Gilles; Waelbroeck, Claire; Voelker, Antje; Meyer, HannoWe illustrate offsets in surface seawater isotopic composition between recent public datasets from the Atlantic Ocean and the subtropical southeastern Indian Ocean. The observed offsets between datasets often exceed 0.10 parts per thousand in delta 18O and 0.50 parts per thousand in delta 2H. They might in part originate from different sampling of seasonal, interannual, or spatial variability. However, they lik...
High-frequency glacial climate instability during the early pleistocene: insigh...
Trotta, Samanta; Duque Castaño, Monica Liliana; Rodrigues, Teresa; Voelker, Antje; Maiorano, Patrizia; Balestra, Barbara; Flores, José-AbelWe provide new high-resolution data on alkenone-derived sea surface temperature (SST) and calcareous plankton key taxa in temporally well constrained, high resolution benthic and planktonic oxygen isotope records at Integrated Ocean Drilling Program site U1387 in the Gulf of Cadiz. The investigated time interval encompasses the Early Pleistocene marine isotope stages (MIS) 48 to MIS 43. The aim is to evidence m...
The early–middle pleistocene transition in the gulf of Cadiz (NE Atlantic) – an...
Mega, Aline; Rodrigues, Teresa; Salgueiro, Emilia; Padilha, Mária; Kuhnert, Henning; Voelker, AntjeBesides the shift in dominant orbital cyclicity depicted in paleoclimate proxy records, the Mid-Pleistocene Transition or Early-Middle Pleistocene Transition (EMPT) was linked to a change in the deep thermohaline circulation. Those changes contributed to more intense and longer-lasting glacial periods and cooler sea surface temperatures (SSTs) during glacials. Within the Atlantic Ocean, the Iberian Margin is co...
Distinct seasonal changes and precession forcing of surface and subsurface temp...
Pang, Xiaolei; Voelker, Antje; Lu, Sihua; Ding, XuanThe Late Pliocene marks the intensification of Northern Hemisphere glaciation (iNHG), offering a unique opportunity to study climate evolution and ice-sheet-related feedback mechanisms. In this study, we present high-resolution Mg / Ca-based sea surface temperatures (SSTs) and subsurface temperatures (SubTs) derived from the foraminiferal species Globigerinoides ruber and Globorotalia hirsuta, respectively, at ...
ForCenS-LGM: a dataset of planktonic foraminifera species assemblage compositio...
Jonkers, Lukas; Mix, Alan; Voelker, Antje; Risebrobakken, Bjørg; Smart, Christopher W.; Ivanova, Elena; Arellano-Torres, Elsa; Eynaud, FrédériqueSpecies assemblage composition of marine microfossils offers the possibility to investigate ecological and climatological change on time scales inaccessible using conventional observations. Planktonic foraminifera - calcareous zooplankton - have an excellent fossil record and are used extensively in palaeoecology and palaeoceanography. During the Last Glacial Maximum (LGM; 19,000 - 23,000 years ago), the climat...