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Pleistocene sea-surface temperature evolution: Early cooling, delayed glacial intensification, and implications for the mid-Pleistocene climate transition. ArchiMer
Mcclymont, Erin L.; Sosdian, Sindia M.; Rosell-mele, Antoni; Rosenthal, Yair.
mid-Pleistocene climate transition (MPT) is defined by the emergence of high amplitude, quasi-100 ka glacial-interglacial cycles from a prior regime of more subtle 41 ka cycles. This change in periodicity and amplitude cannot be explained by a change in 'external' astronomical forcing. Here, we review and integrate published records of sea-surface temperatures (SSTs) to assess whether a common global expression of the MPT in the surface ocean can be recognized, and examine our findings in light of mechanisms proposed to explain climate system reorganization across the MPT. We show that glacial-interglacial variability in SSTs is superimposed upon a longer-term cooling trend in oceanographic systems spanning the low-to high-latitudes. Regional variability...
Tipo: Text Palavras-chave: Sea surface temperatures; Mid-Pleistocene transition; Ice sheets; 100 kyr world.
Ano: 2013 URL: https://archimer.ifremer.fr/doc/00264/37510/82770.pdf
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Reconstruction des transferts sédimentaires en provenance du système glaciaire de Mer d'Irlande et du paléofleuve Manche au cours des derniers cycles climatiques ArchiMer
Toucanne, Samuel.
The Pleistocene has been period of fluctuating climate accompanied by prominent sea-level lowstands during the glacial intervals, when massive continental ice sheets extended from mountainous to lowland European areas. The retreat of the shoreline on the extensive present-day shallow continental shelf of the southern part of the British Isles induced the appearance of the 'Fleuve Manche' palaeoriver, one of the largest systems that drained the European continent. Sedimentary records from the Bay of Biscay offer an independent record allowing the reconstruction of the freshwater and sediment discharges of the 'Fleuve Manche', and the possibility of detecting the imprint of surrounding ice-sheet oscillations and attendant modification of hinterland drainage...
Tipo: Text Palavras-chave: Land sea correlations; European fluvial system; Glacial Irish Sea system; 'Fleuve Manche' palaeoriver; Ice sheets; Glaciations; Climate; Pleistocene; Turbidite systems; Sediment transfer; Bay of Biscay; Corrélations terre mer; Réseau de drainage européen; Système glaciaire de Mer d'Irlande; Fleuve Manche; Calottes glaciaires; Glaciations; Climat; Pléistocène; Systèmes turbiditiques; Transferts sédimentaires; Golfe de Gascogne.
Ano: 2008 URL: http://archimer.ifremer.fr/doc/2008/these-6328.pdf
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The timing of Mediterranean sapropel deposition relative to insolation, sea-level and African monsoon changes ArchiMer
Grant, K. M.; Grimm, R.; Mikolajewicz, U.; Marino, G.; Ziegler, M.; Rohling, E. J..
The Mediterranean basin is sensitive to global sea-level changes and African monsoon variability on orbital timescales. Both of these processes are thought to be important to the deposition of organic-rich sediment layers or 'sapropels' throughout the eastern Mediterranean, yet their relative influences remain ambiguous. A related issue is that an assumed 3-kyr lag between boreal insolation maxima and sapropel mid-points remains to be tested. Here we present new geochemical and ice-volume-corrected planktonic foraminiferal stable isotope records for sapropels S1 (Holocene), S3, S4, and S5 (Marine Isotope Stage 5) in core LC21 from the southern Aegean Sea. The records have a radiometrically constrained chronology that has already been synchronised with the...
Tipo: Text Palavras-chave: Eastern Mediterranean; Sapropels; African monsoon; Sea level; Ice sheets; Insolation; Precession; Meltwater pulses.
Ano: 2016 URL: https://archimer.ifremer.fr/doc/00421/53245/83374.pdf
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