Holocene climate variability in the North-Western Mediterranean Sea (Gulf of Lions)
作者： B. Jalali , M.-A. Sicre , M.-A. Bassetti , N. Kallel
关键词: Discharge 、 Sedimentary rock 、 Holocene climatic optimum 、 Geology 、 North Atlantic oscillation 、 Oceanography 、 Mediterranean sea 、 Structural basin 、 Holocene 、 Flood myth
摘要: Sea surface temperatures (SSTs) and land-derived input time series were generated from the Gulf of Lions inner-shelf sediments (NW Mediterranean Sea) using alkenones high-molecular-weight odd-carbon numbered n-alkanes (TERR-alkanes), respectively. The SST record depicts three main phases: a warm Early Holocene (∼ 18 ± 0.4 °C) followed by cooling ∼ 3 °C between 7000 1000 BP, rapid warming 1850 AD onwards. Several superimposed multi-decadal to centennial-scale cold events 1 amplitude also identified. TERR-alkanes quantified in same sedimentary horizons identify periods high Rhone River discharge compare them with regional flood reconstructions. Concentrations show broad increase towards present pronounced minimum around 2500 BP large fluctuations during Late Holocene. Comparison activity reconstructions across Alps region suggests that inner shelf originate mainly Upper catchment basin they are primarily delivered positive North Atlantic Oscillation (NAO).
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