Offre de thèse : Climate extremes during the Bronze Age (Lund)

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Several dramatic changes in climate and environment during prehistoric time have been detected in tree-ring data and archaeological records. Despite ever improving methods for palaeoclimatic and archaeological studies, the exact timing, causes and effects of many extreme events are poorly known. In this project, a PhD student will work in a multidisciplinary research group of dendrochronologists, archaeologists, geologist, palaeoclimatologists. The PhD student will apply a novel combination of dendrochemical methods to tree-ring records from subfossil trees. The analyses will be based on Energy-Dispersive X-ray Fluorescence (ED-XRF) and Laser Ablation Inductively Coupled Plasma Mass Spectrometry (LA-ICP-MS), a combination which will enable detection of trace elements from, e.g., volcanic eruptions and anthropogenic activities as metal fabrication. Following detection and dating of the events, stable carbon- and oxygen-isotope ratios as well as tree-ring density and growth anomalies will be explored to gain information on climatic and environmental responses. To clarify the societal responses to extreme events, the PhD student and collaborators will compare our data with large archaeological datasets with palaeodemographic data from burials, settlements, and ritual deposits. Combined such data will provide supportive information on natural and anthropogenic responses. The research project will focus on extreme events observed in the tree-ring records as well as periods when major volcanic eruptions may have influenced the climate in Scandinavia during the mid-Holocene (7000-3000 years before present).

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