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• W2773765374 abstract "Greater understanding of Holocene climatic and environmental variability and processes, as well as about feedback and forcing mechanisms of the climate system is crucial for the assessment of both natural and anthropogenic future climate and environmental changes. Compared to prior epochs in earth’s history, the climate of the Holocene is traditionally regarded as relatively stable. However, Holocene climate also showed significant fluctuations although perturbation were smaller in magnitude compared to Pleistocene. These fluctuations can be assessed by organic geochemical molecular and isotope analyses of lake sedimentary organic matter (OM) that have the potential to reveal a variety of information regarding physical, chemical and biological changes and processes of the lake, its environment, and the climate. Therefore, within the scope of this thesis, sedimentary archives from selected lakes from the Sub-Artic (Lake Tornetrask), the Mediterranean (Lake Dojran), and the African tropics (Lake Dendi) were analyzed using various analytical methods including the analysis of lipid biomarker and compound specific leaf wax stable isotopes, as well as palynological, microcharcoal, and inorganic sedimentological analyses. All three lakes are situated in key regions for the understanding of northern hemispheric Holocene climate variability and natural/anthropogenic forcing and feedback mechanisms:To constrain changes in atmospheric circulation patterns and their effects on the environment in the Fennoscandian sub-arctic, lipid biomarker, inorganic proxies, and compound specific δD analysis are applied to a Holocene sedimentary record from Lake Tornetrask (NW Sweden). Owing to its climate being influenced by both the North Atlantic and the polar frontal zone, northern Fennoscandia can be regarded as a key region to better understand the regional expression and potential threshold effects of insolation-forced migrations of atmospheric circulation systems. The results indicate a non-linear reorganization of the atmospheric circulation expressed as a change from zonal towards more meridional flow starting at ~4,000 and intensifying ~2,000 cal yrs BP. For the reconstruction of the climatic, environmental, and human impact on the southern Balkan Peninsula lipid biomarker, microcharcoal, and pollen analyses are applied to a Holocene sedimentary record from Lake Dojran (Macedonia/Greece). The southern Balkan region played a key role in the early migration of the Neolithic lifestyle to Central Europe and is thus very suitable for studies of human-environment forcing and feedback mechanisms. The results suggest a relationship between anthropogenic activity and centennial to millennial scale environmental/climatic changes, since increased human impact corresponds to phases of higher humidity and high lake levels at Lake Dojran.To detect changes in atmospheric circulation, hydrology, and vegetation in East Africa, associated with the African Humid Period (AHP), lipid biomarker and compound specific δD and δ13C analysis are applied to sedimentary OM from Lake Dendi (Ethiopia). Due to its location in proximity of the Congo Air Boundary (CAB) and the Intertropical Convergence Zone (ITCZ), the Dendi region can play a crucial role in the understanding of past changes in atmospheric circulation pattern of the tropical regions. The results indicate a rapid re-strengthening of the monsoonal circulation in the Early Holocene followed by Peak AHP conditions between ~9,800 yrs cal BP and ~8,000 yrs cal BP. Subsequently a moderate decrease in precipitation and a shift in moisture sources due to weakening monsoonal systems and associated shifts of the ITCZ and the CAB have been detected. Together, the lakes datasets suggest a thermal maximum and a northernmost position of the atmospheric circulation systems in the Early Holocene followed by a long-term trend of decreasing temperatures and environmental changes in accordance with decreasing NH summer insolation. Despite some differences in nature and timing, all tree records further indicate a southwards migration and weakening of NH atmospheric circulation systems over the course of the Holocene with significant phases of climatic/environmental changes around 4,500 yrs cal BP and 2,000 yrs." @default.
• W2773765374 created "2017-12-22" @default.
• W2773765374 creator A5031956378 @default.
• W2773765374 date "2017-01-01" @default.
• W2773765374 modified "2023-09-23" @default.
• W2773765374 title "Reconstructing Holocene climatic and environmental change using molecular and isotopic proxies from lake sedimentary records" @default.
• W2773765374 hasPublicationYear "2017" @default.
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