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Changements climatiques en Méditerranée à la transition Pléistocène inférieur-moyen : pollens, isotopes stables et cyclostratigraphie

Abstract : Pollen analysis has been performed on six sections (Santa Lucia, Montalbano Jonico, Site ODP 976; Tsampika and Shamb) placed along a 4,000 km long transect from the Western Mediterranean region to Little Caucasus. These sections recorded same vegetation changes related to climatic cycles occurred throughout the Mediterranean region during the Early-Middle Pleistocene (1.600-0.700 Ma), despite an observed longitudinal gradient. Mesothermic taxa were affected by the increasing aridity and the extremes related to climatic cycles during this considered time-window.
“Long-term” vegetation successions were controlled by climatic cycles related to the obliquity forcing. A similar vegetation dynamics with short and longer-term durations were forced by precession and its modulator (the eccentricity), respectively. Influences of both parameters were superimposed. The expected shift from obliquity to 100 ka long-cycles related to eccentricity is not observed in the Mediterranean region during the Mid-Pleistocene Transition.
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https://tel.archives-ouvertes.fr/tel-00347549
Contributor : Sebastien Joannin Connect in order to contact the contributor
Submitted on : Tuesday, December 16, 2008 - 11:26:36 AM
Last modification on : Tuesday, October 12, 2021 - 2:48:16 PM
Long-term archiving on: : Tuesday, June 8, 2010 - 5:21:57 PM

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  • HAL Id : tel-00347549, version 1

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Sebastien Joannin. Changements climatiques en Méditerranée à la transition Pléistocène inférieur-moyen : pollens, isotopes stables et cyclostratigraphie. Sciences de la Terre. Université Claude Bernard - Lyon I, 2007. Français. ⟨tel-00347549⟩

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