Synchronizing <sup>10</sup>Be in two varved lake sediment records to IntCal13 <sup>14</sup>C during three grand solar minima

Abstract

Abstract.Timescale uncertainties between paleoclimate reconstructions often inhibit studying the exact timing, spatial expression and driving mechanisms of climate variations. Detecting and aligning the globally common cosmogenic radionuclide production signal via a curve fitting method provides a tool for the quasi-continuous synchronization of paleoclimate archives. In this study, we apply this approach to synchronize 10

Tiefer See – a key site for lake sediment research in NE Germany

“…The identification of another five Holocene cryptotephras of Icelandic origin in the lower part of the sediment profile (Hässeldalen, Askja-S, Saksunarvatn, Lairg B; Wulf et al, 2016) provides a good estimate of the early Holocene age model. 10 Be data further confirmed the chronology and allowed an independent synchronisation with the varved sediment record from Lake Czechowskie a few hundred kilometres further east (Czymzik et al, 2015(Czymzik et al, , 2018. The base of the profile is dated into the late Allerød through the detection of glass shards from the Laacher See eruption (12 880 yrs BP).…”

“…The alternation of varved and poorly or non-varved sediment intervals is also reflected in stable carbon isotope data of organic matter which is interpreted as variations between predominantly anoxic and oxic lake bottom waters (Dräger et al, 2019). The frequency and duration of poorly varved intervals increased during the late Holocene and has been related to either climatic changes (increased windiness) or human impact in the catchment (Dräger et al, 2017).…”

“…2a) during three field campaigns in 2011, 2013 and 2019. A composite profile has been established from six cores which includes two minor gaps below 7.5 m depth in the early Holocene (Dräger et al, 2017). These gaps have been closed with the new cores taken in 2019.…”

“…The organic-rich sediments vary in structure from finely laminated to poorly laminated and massive. The finely laminated sediments represent three different microfacies types of varves, (1) Ca-rhodochrosite varves, (2) or- ganic varves and (3) calcite varves (Dräger et al, 2017). The most recent period of varve preservation began in 1924 CE (Kienel et al, 2017) with the formation of calcite varves (Fig.…”

Using Annual Resolution Pollen Analysis to Synchronize Varve and Tree-Ring Records

“…Accurate synchronization of varve records is possible with tephra layers, yet only a limited number of tephra layers, often less than one per millennium, is available even in well studied areas, e.g., Europe [10][11][12], Japan [13] or New Zealand [14]. Furthermore, recently proof has been provided for 10 Be as a novel synchronization tool for varved lake sediments [8,15].…”