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Half-precession signals in Lake Ohrid and their spatial and temporal connection to proxy records in the European realm

Lake Ohrid (North Macedonia/Albania) is Europe’s oldest lake and thus is a valuable archive for changes of local (hydro)climate during the last 1.36 million years (e.g., Wagner et al. 2019). During an International Continental Scientific Drilling Program campaign in 2013, geophysical downhole logging by the Leibniz Institute for Applied Geophysics acquired continuous datasets of physical properties. Additionally, sediment cores from four sites were obtained, the deepest with a length of 570 m (Wagner et al. 2014). Investigations of half-precession (HP) cycles (~9,000 – 12,000 years) have been given a subordinate role in previous cyclostratographic studies. Here we focus on HP-signals in Lake Ohrid and investigate the temporal variability of this signal over the last one million years. Next to a connection of HP-cycles to interglacials, we see a more pronounced HP-signal in the younger part of several proxy records. We relate the results from Lake Ohrid to a variety of proxy records from the European mainland and marine records. The HP-signal is to some extent present in all of the investigated sites and exhibits similarities, but also differences to the Lake Ohrid-records. HP-cycles are a relevant part of natural climate variability - also in Europe - and allow a more detailed investigation of sedimentary systems. References: Wagner, Bernd, et al. "The SCOPSCO drilling project recovers more than 1.2 million years of history from Lake Ohrid." Scientific Drilling 17 (2014): 19-29. Wagner, Bernd, et al. "Mediterranean winter rainfall in phase with African monsoons during the past 1.36 million years." Nature 573.7773 (2019): 256-260.


Arne Ulfers1, Christian Zeeden1, Silke Voigt2, Wonik Thomas1
1Leibniz Institute for Applied Geophysics, Hannover, Germany; 2Institute of Geosciences, Goethe University Frankfurt, Germany
GeoKarlsruhe 2021