Consulta: creatorFacets:"Bahr, Andre"
Registros recuperados: 4
Data/hora: 11/06/2024 02:40:08

Abrupt changes of temperature and water chemistry in the late Pleistocene and early Holocene Black Sea
Provedor de dados: 5
Autores: Bahr, Andre; Lamy, Frank; Arz, Helge W.; Major, Candace; Kwiecien, Olga; Wefer, Gerold.
[1] New Mg/Ca, Sr/Ca, and published stable oxygen isotope and Sr-87/(86) Sr data obtained on ostracods from gravity cores located on the northwestern Black Sea slope were used to infer changes in the Black Sea hydrology and water chemistry for the period between 30 to 8 ka B. P. ( calibrated radiocarbon years). The period prior to 16.5 ka B. P. was characterized by stable conditions in all records until a distinct drop in delta O-18 values combined with a sharp increase in Sr-87/(86) Sr occurred between 16.5 and 14.8 ka B. P. This event is attributed to an increased runoff from the northern drainage area of the Black Sea between Heinrich Event 1 and the onset of the Bolling warm period. While the Mg/Ca and Sr/Ca records remained rather unaffected by this...
Tipo: Text
Palavras-chave: Black Sea; Ostracods; Trace elements.
Ano: 2008
URL: https://archimer.ifremer.fr/doc/00209/31989/30432.pdf

New insights into upper MOW variability over the last 150 kyr from IODP 339 Site U1386 in the Gulf of Cadiz
Provedor de dados: 5
Autores: Kaboth, Stefanie; Bahr, Andre; Reichart, Gert-jan; Jacobs, Bram; Lourens, Lucas J.
The upper Mediterranean Outflow Water (MOW) paleo-oceanographic history in the Gulf of Cadiz is poorly constrained due to the lack of high-resolution records that pre-date the last glaciation. Existing proxy records concentrate on MOW variability along the middle slope of the Gulf of Cadiz. Here we present a continuous high-resolution benthic foraminifera delta O-18 record from the upper MOW core at IODP Expedition 339 Site U1386 in the Gulf of Cadiz of the past 150,000 years. Based on delta O-18, grain-size and Zr/AI variability comparison of our results with existing Mediterranean Sea (MD01-2472, MD95-2043), open ocean (LR04) and Gulf of Cadiz (MD99-2339) records we have gathered new insights into the evolution of the upper MOW core on glacial...
Tipo: Text
Palavras-chave: Mediterranean outflow; Glacial-interglacial variability; Sapropel; Heinrich events; Gulf of Cadiz.
Ano: 2016
URL: https://archimer.ifremer.fr/doc/00421/53235/54767.pdf

Mississippi River discharge over the last similar to 560,000 years - Indications from X-ray fluorescence core-scanning
Provedor de dados: 5
Autores: Kujau, Ariane; Nuernberg, Dirk; Zielhofer, Christoph; Bahr, Andre; Roehl, Ursula.
The long term history of terrigenous flux to the Gulf of Mexico via the Mississippi River is hardly known. We here present geochemical and sedimentological data to approximate the varying Mississippi River sediment influx into the northeastern Gulf of Mexico (GoM) over the last six glacial-interglacial cycles (MIS 1 to 14). Our study is based on the IMAGES sediment core MD02-2576 that was recovered from the DeSoto Canyon and is located similar to 200 km south to the recent Mississippi River delta and similar to 150 km east of the recent coastline of Florida. Concentrations of siliciclastic elements in bulk sediment samples were estimated from XRF scanning and calibrated by single bulk XRF-analyses. Elemental ratios of the sedimentary record correspond to...
Tipo: Text
Palavras-chave: Mississippi sediment discharge; Mississippi flood dynamics; Gulf of Mexico; Glacial-interglacial cycles; XRF-scanning.
Ano: 2010
URL: https://archimer.ifremer.fr/doc/00230/34135/82666.pdf

Monsoonal Forcing of European Ice-Sheet Dynamics During the Late Quaternary
Provedor de dados: 5
Autores: Kaboth-bahr, Stefanie; Bahr, Andre; Zeeden, Christian; Toucanne, Samuel; Eynaud, Frederique; Jimenez-espejo, Francisco; Rohl, Ursula; Friedrich, Oliver; Pross, Joerg; Lowemark, Ludvig; Lourens, Lucas J.
The dynamics of Northern Hemisphere ice sheets during Late Quaternary glacials have yet been dominantly examined from a Laurentide Ice Sheet perspective, which helped shaping the idea of moisture-starved glacials and small-scale ice volume variability. However, the waxing and waning of the European Ice Sheet (EIS) casts doubt on this perception. Understanding EIS dynamics under glacial boundary conditions is crucial because its meltwater pulses influence global climate by weakening deepwater formation in the North Atlantic Ocean. Here we show that the advection of subtropical water toward the continental margin of western Europe lead to enhanced moisture availability on the continent and fueled the growth of EIS lobes during glacials. This warm-water...
Tipo: Text
Palavras-chave: Mediterranean Outflow variability; European Ice Sheet dynamics; Marine‐terrestrial feedback in the Euro‐Mediterranean realm; Glacial climate variability; Low‐latitude forcing of high‐latitude glaciations.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00457/56831/58657.pdf