Browsing by Author "Engels, S"

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    Bog burst in the eastern Netherlands triggered by the 2.8 kyr BP climate event
    (Sage Journals, 2014-11) van Geel, B; Heijnis, H; Charman, DJ; Thompson, G; Engels, S
    The nature and cause of the so-called 2.8 kyr BP event have been a subject of much debate. Peat sequences have provided much of the evidence for this event, but the process link between climate and peatland response is not well understood. Multiproxy, high-resolution analysis of a core from Bargerveen in the eastern Netherlands based on pollen, non-pollen palynomorphs, testate amoebae and geochemistry identified an abrupt shift from relatively dry to extremely wet conditions. Radiocarbon-based wiggle-match dating (WMD) and biostratigraphy based on the pollen record show that this shift in local hydrology occurred around 2800 cal. yr BP. We interpret an erosional hiatus lasting up to 950 years immediately prior to this, as the effect of a bog burst after excessive rainfall. This phenomenon was not limited to our sampling location but occurred over a large part of the former Bargerveen. Peat at the hiatus contains microfossils that reflect temporary eutrophication as a consequence of local fires and secondary decomposition because of increased drainage after the erosion event. Our data show how detailed multiproxy analyses can elucidate the past response of peatlands to changing climate and suggest that the climatic change in northwest Europe at this time caused major non-linear disruption to these ecosystems. © 2014, © SAGE Publications.
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    Bog burst in the eastern Netherlands triggered by the 2.8 kyr BP climate event
    (University of New South Wales and Australian Nuclear Science and Technology Organisation, 2015-07-09) Heijnis, H; van Geel, B; Charman, DJ; Thompson, G; Engels, S
    Not provided to the ANSTO Library.
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    A global database of holocene paleotemperature records
    (Springer Nature Limited, 2020-04-14) Kaufman, DS; McKay, N; Rouston, C; Erb, M; Davis, B; Heiri, O; Jaccard, SL; Tierney, J; Dätwyler, C; Axford, Y; Brussel, T; Cartapanis, O; Chase, BM; Dawson, A; de Vernal, A; Engels, S; Jonkers, L; Marsicek, J; Moffa-Sánchez, P; Morrill, C; Oris, A; Rehfeld, K; Saunders, KM; Sommer, PS; Thomas, E; Tonello, M; Tóth, M; Vachula, R; Andreev, A; Bertrand, S; Biskaborn, B; Bringué, M; Brooks, S; Caniupán, M; Chevalier, M; Cwynar, L; Emile-Geay, J; Fegyveresi, J; Feurdean, A; Finsinger, W; Fortin, MC; Foster, L; Fox, M; Gajewski, K; Grosjean, M; Hausmann, S; Heinrichs, M; Holmes, N; Ilyashuk, B; Ilyashuk, E; Juggins, S; Khider, D; Koinig, K; Langdon, P; Larocque-Tobler, I; Li, JY; Lotter, A; Luoto, T; Mackay, A; Magyari, E; Malevich, S; Mark, B; Massaferro, J; Montade, V; Nazarova, L; Novenko, E; Pařil, P; Pearson, E; Peros, M; Peinitz, R; Płóciennik, M; Porinchu, D; Potito, A; Rees, ABH; Reinemann, S; Roberts, SJ; Rolland, N; Salonen, S; Self, A; Seppä, H; Shala, S; St-Jacques, JM; Stenni, B; Syrykh, L; Tarrats, P; Taylor, K; van den Bos, V; Velle, G; Wahl, E; Walker, I; Wilmshurst, J; Zhang, E; Zhilich, S
    A comprehensive database of paleoclimate records is needed to place recent warming into the longer-term context of natural climate variability. We present a global compilation of quality-controlled, published, temperature-sensitive proxy records extending back 12,000 years through the Holocene. Data were compiled from 679 sites where time series cover at least 4000 years, are resolved at sub-millennial scale (median spacing of 400 years or finer) and have at least one age control point every 3000 years, with cut-off values slackened in data-sparse regions. The data derive from lake sediment (51%), marine sediment (31%), peat (11%), glacier ice (3%), and other natural archives. The database contains 1319 records, including 157 from the Southern Hemisphere. The multi-proxy database comprises paleotemperature time series based on ecological assemblages, as well as biophysical and geochemical indicators that reflect mean annual or seasonal temperatures, as encoded in the database. This database can be used to reconstruct the spatiotemporal evolution of Holocene temperature at global to regional scales, and is publicly available in Linked Paleo Data (LiPD) format. © 2020 The Authors
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    Using high-resolution geochemical data from XRF core scanning to interpret major climatic events at the Uddelermeer site (The Netherlands)
    (International Union for Quaternary Research (INQUA), 2019-07-27) Gadd, PS; Heijnis, H; Peti, L; Engels, S
    High-resolution X-ray fluorescence (XRF) scanning data is used as a palaeoclimate proxy on a long sediment record retrieved from Lake Uddelermeer. Lake Uddelermeer is the only lake in The Netherlands to contain a continuous record of environmental and climate change from the late Pleistocene to present. Due to its unique character, the lake has been studied by various research groups since the 1950s. Here we focus on a newly retrieved sediment core which has been radiocarbon dated and for which a variety of palaeoecological and palaeoclimatological data is available. We scanned the 15.6 m sediment sequence at 200 µm interval and geochemical proxies were utilised to infer changes in the lake system during major climatic events, and compared our results to existing palaeoecological and palaeoclimatological data from the same sediment sequence. Commonly used proxies such as Si/Ti can imply changes in biogenic silica and Rb/Sr can suggest chemical weathering. These proxies were looked at in detail in conjunction with the dates to confirm the timing and impact of the following major events: the Bølling-Allerød, Younger Dryas, Pre-boreal oscillations, the 9.3 ka, 8.2 ka, 2.8 ka and the Little Ice Age. Additionally, the use of high-resolution XRF scanning can be very useful for finding crypto tephra, and in this presentation, we will explore the potential occurrence of the Vedde Ash (Iceland) and the Laacher See Ash (Germany) in the sediment sequence, as well as other unidentified crypto tephra during the Last Glacial termination.