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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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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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