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A multiproxy study of past environmental changes in the Sea of Okhotsk during the last 1.5 Ma 5
Lattaud, Julie; Lo, Li; Zeeden, Christian; Liu, Ya-jun; Song, Sheng-rong; Van Der Meer, Marcel T.j.; Sinninghe Damsté, Jaap S.; Schouten, Stefan.
Long-chain diols have been detected in a wide range of environments and have been used to reconstruct past environmental changes, however only a few long-term records exist to date. Here we reconstructed past environmental changes in the central Sea of Okhotsk over the last 1.5 million years, covering the Mid-Pleistocene Transition (MPT). Sea surface temperatures (SST) reconstructed using the Long-Chain Diol Index (LDI) reflects glacial/interglacial changes. However, when compared with other organic paleothermometers (Uk’37 and TEXL86) the LDI-SST is lower during interglacials and similar or higher during glacials, possibly suggesting a shift of diol production season during interglacials. The LDI-SST does not change in periodicity around the MPT as...
Tipo: Text Palavras-chave: Sea of Okhotsk; Mid-Pleistocene Transition; LDI; TEX86; U-37(K)'; Biogenic opal; Long-chain diols.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00489/60060/63342.pdf
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Monsoonal Forcing of European Ice-Sheet Dynamics During the Late Quaternary 5
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
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