globalchange  > 过去全球变化的重建
DOI: 10.1016/j.palaeo.2017.07.027
论文题名:
A low seasonality scenario in the Mediterranean Sea during the Calabrian (Early Pleistocene) inferred from fossil Arctica islandica shells
作者: von Leesen G.; Beierlein L.; Scarponi D.; Schöne B.R.; Brey T.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2017
语种: 英语
英文关键词: Paleotemperature reconstruction ; Sclerochronology ; Sicily ; Stable oxygen isotopes
英文摘要: Understanding past seasonal temperature variability in the ocean is essential to evaluate the effects of future climate change on marine ecosystems. Here, we estimate seasonal water temperature amplitudes from stable oxygen isotope (δ18Oshell) values of fossil shells of Arctica islandica (assuming δ18Owater =+0.9±0.1‰ V-SMOW). Specimens were collected from three Pleistocene successions (Emilian and Sicilian substages of the Calabrian) in Central and Southern Italy (i.e., Rome, Lecce and Sicily). Biostratigraphic analyses from Rome Quarry deposits indicate an age between 1.6 and 1.2Ma, whereas Sicily and Lecce successions are slightly more recent (between 1.1 and 0.62Ma). Prior to carbonate geochemical analysis, we checked the shells for potential diagenetic alterations (e.g., from aragonite to calcite) using confocal Raman microscopy. δ18Oshell transects indicate an annual temperature amplitude of about 3°C during the Early Pleistocene. This is in sharp contrast to reconstructions based on faunal assemblages, according to which the simultaneous occurrence of boreal and warm-water species in the Calabrian Mediterranean Sea suggests a much higher seasonality (ca. 10°C). The low seasonality and the relatively cold water (9-10°C) indicate the outcrops represent colder climatic conditions compared to modern times, and suggest the occurrence of a maximum glacial phase. © 2017 Elsevier B.V.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/68138
Appears in Collections:过去全球变化的重建

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作者单位: Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research, Am Handelshafen 12, 27570 Bremerhaven, Germany; Department of Biological, Geological and Environmental Sciences, University of Bologna, Piazza Porta San Donato 1, 40126 Bologna, Italy; Institute of Geosciences, Johannes Gutenberg University Mainz, J.-J.-Becher-Weg 21, 55128 Mainz, Germany; Helmholtz Institute for Functional Marine Biodiversity at the University of Oldenburg, Carl-von-Ossietzky-Str. 9 -11, 26129 Oldenburg, Germany

Recommended Citation:
von Leesen G.,Beierlein L.,Scarponi D.,et al. A low seasonality scenario in the Mediterranean Sea during the Calabrian (Early Pleistocene) inferred from fossil Arctica islandica shells[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2017-01-01
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