Consulta: creatorFacets:"Knies, J."
Registros recuperados: 2
Data/hora: 03/06/2024 11:31:44

Meltwater and ice rafting in the southern Norwegian Sea between 20 and 40 calendar kyr BP: Implications for Fennoscandian Heinrich events
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Lekens, W. A. H.; Sejrup, H. P.; Haflidason, H.; Knies, J.; Richter, T.
[ 1] The timing of meltwater release in the southern Norwegian Sea in relation to millennial-scale climate variability is studied from core MD99-2283 based on down-core analysis of stable oxygen and carbon isotopes, calcium carbonate and ice-rafted debris (IRD). Between 20 and 40 calendar (cal) kyr B. P., strong Dansgaard-Oeschger cyclicity is expressed in increased carbonate content and reduced total organic carbon during warm interstadials and IRD marking the end of cold stadials. The planktonic delta(18)O record of core MD99-2283 compared to available isotopic records in the region confirms the existence of multisourced, synchronized meltwater anomalies during Heinrich ( H) events 2 to 4. It was found that the sudden release of meltwater occurs near...
Tipo: Text
Palavras-chave: Meltwater; Nordic Seas; Heinrich events.
Ano: 2006
URL: https://archimer.ifremer.fr/doc/00234/34525/33431.pdf

Methane seepage at Vestnesa Ridge (NW Svalbard) since the Last Glacial Maximum
Provedor de dados: Institutional Archive of Ifreme (ArchiMer)
Autores: Schneider, A.; Panieri, G.; Lepland, A.; Consolaro, C.; Cremiere, A.; Forwick, M.; Johnson, J. E.; Plaza-faverola, A.; Sauer, S.; Knies, J.
Multiple proxies in the geological record offshore NW Svalbard track shallow subseafloor diagenesis and seafloor methane seepage during the Last Glacial Maximum (LGM) extent and the disintegration of the Svalbard Barents Sea Ice Sheet (SBIS). Vestnesa Ridge, located at 79°N and in 1200 m water depth, is one of the northernmost known active methane seep sites and is characterised by a subseafloor fluid flow system, numerous seafloor pockmarks and gas flares in the water column. In this study, we develop a Late Pleistocene and Holocene stratigraphic framework, use stable oxygen and carbon isotope signatures (δ18O, δ13C) of benthic and planktic foraminifera, the mineralogical and carbon isotope composition of methane-derived authigenic carbonate (MDAC) and...
Tipo: Text
Palavras-chave: Micropaleontology; Foraminifers; Stable isotopes; Methane seepage; Authigenic carbonate; Holocene; Pleistocene; Paleogeography; Deglaciation; Arctic Ocean.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00445/55652/60554.pdf