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Orbital- and sub-orbital-scale climate impacts on vegetation of the western Mediterranean basin over the last 48,000 yr ArchiMer
Fletcher, William J.; Goni, Maria Fernanda Sanchez.
High-resolution pollen analysis of Alboran Sea Core MD95-2043 provides a 48-ka continuous vegetation record that can be directly correlated with sea surface and deep-water changes. The reliability of this record is supported by comparison with that of Padul (Sierra Nevada, Spain). Marine Isotope Stage (MIS) 3 was characterised by fluctuations in Quercus forest cover in response to Dansgaard-Oeschger climate variability. MIS 2 was characterised by the dominance of semi-desert vegetation. Despite overall dry and cold conditions during MIS 2, Heinrich events (HEs) 2 and 1 were distinguished from the last glacial maximum by more intensely and conditions. Taxon-specific vegetation responses to a tripartite climatic structure within the HEs are observed. In MIS...
Tipo: Text Palavras-chave: Marine palynology; Land-sea correlation; Iberian margin; Mediterranean region; Dansgaard-Oeschger variability; Heinrich events; LGM; Holocene; Precession.
Ano: 2008 URL: https://archimer.ifremer.fr/doc/00237/34783/33369.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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