Orbital variations in planktonic foraminifera assemblages from the Ionian Sea during the Middle Pleistocene Transition
| Type | Article | ||||||||
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| Date | 2013-01 | ||||||||
| Language | English | ||||||||
| Author(s) | Incarbona Alessandro1, Dinares-Turell Jaume2, Di Stefano Enrico1, Ippolito Giuseppe1, Pelosi Nicola3, Sprovieri Rodolfo1 | ||||||||
| Affiliation(s) | 1 : Univ Palermo, Dipartimento Sci Terra & Mare, I-90134 Palermo, Italy. 2 : Ist Nazl Geofis & Vulcanol, I-00143 Rome, Italy. 3 : CNR, Ist Ambiente Marino Costiero, I-80133 Naples, Italy. |
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| Source | Palaeogeography Palaeoclimatology Palaeoecology (0031-0182) (Elsevier Science Bv), 2013-01 , Vol. 369 , P. 303-312 | ||||||||
| DOI | 10.1016/j.palaeo.2012.10.039 | ||||||||
| WOS© Times Cited | 4 | ||||||||
| Keyword(s) | Middle Pleistocene Transition, Planktonic foraminifera, Ionian Sea, Orbital climate variability, Neogloboquadrina pachyderma sinistral coiling | ||||||||
| Abstract | The Middle Pleistocene Transition (1.2-0.7 Ma) is the most recent re-organization of the global climate system which includes variations in the frequency and amplitude of glacial/interglacial cycles, increased ice sheet volume, sea surface temperature cooling and a significant drop in the CO2 atmospheric levels. Here we present high-resolution planktonic foraminifera data (mean sampling resolution of about 780 years) from core LC10 recovered in the Ionian Sea (eastern Mediterranean), between 1.2 and 0.9 Ma. Selected taxa, among them G. ruber, T. quinqueloba and G. bulloides, show significant periodicities that can be associated to orbital cycles, mainly precession and obliquity. The planktonic foraminifera based paleoclimatic curve exhibits a cooling linear trend that can be associated to similar phenomena observed in the North Atlantic. On the other hand, we refer to the influence of the North African Monsoon the occurrence of two peaks of the low-salinity tolerant species G. quadrilobatus that fall in coincidence of sapropel layers. Finally, we discuss the distribution pattern of N. pachyderma sinistral coiling, with peaks up to about 20% between MIS 30 and 28, and compare it to middle-late Quaternary records of the Sicily Channel and western Mediterranean. | ||||||||
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