Geoarchaeological and Paleo-Hydrological Overview of the Central-Western Mediterranean Early Neolithic Human–Environment Interactions

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Abstract

Climate change is still a subject of debate for archaeologist-neolithicists. Its exact chronology, internal pattern, variations in space and time, and impacts on sites and ecosystems and on coastal dynamic and river systems have yet to be assessed. Only a strict comparative approach at high chronological resolution will allow us to make progress on the causality of the socio-environmental processes at work during Neolithisation. Post-depositional impacts on the Early Neolithic hidden reserve also remain underestimated, which has led to the perpetuation of terms such as “Macedonian desert” and “archaeological silence” in the literature on the Neolithic. Off-site geoarchaeological and paleoenvironmental approaches provide some answers to these questions and opens up new research perspectives.

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Modeling Atmospheric 14C Influences and 14C Ages of Marine Samples to 10,000 BC

Thomas F. Braziunas, Minze Stuiver (1993)

The detailed radiocarbon agevs.calibrated (cal) age studies of tree rings reported in this Calibration Issue provide a unique data set for precise14C age calibration of materials formed in isotopic equilibrium with atmospheric CO2. The situation is more complex for organisms formed in other reservoirs, such as lakes and oceans. Here the initial specific14C activity may differ from that of the contemporaneous atmosphere. The measured remaining14C activity of samples formed in such reservoirs not only reflects14C decay (related to sample age) but also the reservoir14C activity. As the measured sample14C activity figures into the calculation of a conventional14C age (Stuiver & Polach 1977), apparent14C age differences occur when contemporaneously grown samples of different reservoirs are dated.

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9,400 years of cosmic radiation and solar activity from ice cores and tree rings.

Friedhelm Steinhilber, José Abreu, Jürg Hans Beer … (2012)

Understanding the temporal variation of cosmic radiation and solar activity during the Holocene is essential for studies of the solar-terrestrial relationship. Cosmic-ray produced radionuclides, such as (10)Be and (14)C which are stored in polar ice cores and tree rings, offer the unique opportunity to reconstruct the history of cosmic radiation and solar activity over many millennia. Although records from different archives basically agree, they also show some deviations during certain periods. So far most reconstructions were based on only one single radionuclide record, which makes detection and correction of these deviations impossible. Here we combine different (10)Be ice core records from Greenland and Antarctica with the global (14)C tree ring record using principal component analysis. This approach is only possible due to a new high-resolution (10)Be record from Dronning Maud Land obtained within the European Project for Ice Coring in Antarctica in Antarctica. The new cosmic radiation record enables us to derive total solar irradiance, which is then used as a proxy of solar activity to identify the solar imprint in an Asian climate record. Though generally the agreement between solar forcing and Asian climate is good, there are also periods without any coherence, pointing to other forcings like volcanoes and greenhouse gases and their corresponding feedbacks. The newly derived records have the potential to improve our understanding of the solar dynamics and to quantify the solar influence on climate.