Distinct lake level lowstand in Lake Prespa (SE Europe) at the time of the 74 (75) ka Toba eruption

Wagner, Bernd; Leng, Melanie J.; Wilke, Thomas; Böhm, A.; Panagiotopoulos, Konstantinos; Vogel, Hendrik; Lacey, Jack H.; Zanchetta, Giovanni; Sulpizio, Roberto

doi:10.5194/cp-10-261-2014

Cited by 10 publications

(7 citation statements)

References 34 publications

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“…We include records of HgT (this study) normalized to records of total organic carbon (TOC) (Damaschke et al, 2013), sulphide (estimated by total sulphur (TS)) , and detrital mineral abundance (estimated by potassium (K)) (Panagiotopoulos et al, 2014), with filled shading marking the original datasets. A distinct lake low stand based on seismic profiles and sedimentological data is marked at 14.63 -14.58 m depth (red shading) (Wagner et al, 2014). A purple arrow marks sections where artificially high Hg/TOC values are generated by a sharp drop to near-zero TOC (<0.06 wt %) coinciding with deposition of the Y-5 (17.1 m) tephra unitan effect expected as background sedimentation is interrupted by volcanic ash deposition.…”

Section: Host Phase Controlsmentioning

confidence: 99%

Mercury records covering the past 90 kyr from lakes Prespa and Ohrid, SE Europe

Paine

Fendley

Frieling

et al. 2023

Preprint

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Abstract. The element mercury (Hg) is a key pollutant, and much insight has been gained by studying the present-day Hg cycle. However, many important processes within this cycle operate on timescales responsive to centennial to millennial-scale environmental variability, highlighting the importance of also investigating the longer-term Hg records in sedimentary archives. To this end, we here explore the timing, magnitude, and expression of Hg signals retained in sediments over the past ~90 ka from two lakes, linked by a subterranean karst system: Lake Prespa (Greece/North Macedonia/Albania) and Lake Ohrid (North Macedonia/Albania). Results suggest that Hg fluctuates largely independent of variability in common host phases in each lake, and the recorded sedimentary Hg signals show distinct differences first during the late Pleistocene (Marine Isotope Stages 2–5). The Hg signals in Lake Prespa sediments highlights an abrupt, short-lived, peak in Hg accumulation coinciding with local deglaciation. In contrast, Lake Ohrid shows a broader interval with enhanced Hg accumulation, and, superimposed, a series of low-amplitude oscillations in Hg concentration peaking during the Last Glacial Maximum, that may result from elevated clastic inputs. Divergent Hg signals are also recorded during the early and middle Holocene (Marine Isotope Stage 1). Here, Lake Prespa sediments show a series of large Hg peaks; while Lake Ohrid sediments show a progression to lower Hg values. Around 3 ka, anthropogenic influences overwhelm local fluxes in both lakes. The lack of coherence in Hg accumulation between the two lakes suggests that, in the absence of an exceptional perturbation, local differences in sediment composition, lake structure, and water balance all influence the local Hg cycle, and determine the extent to which Hg signals reflect local or global-scale environmental changes.

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Section: Host Phase Controlsmentioning

confidence: 99%

Mercury records covering the past 90 kyr from lakes Prespa and Ohrid, SE Europe

Paine

Fendley

Frieling

et al. 2023

Preprint

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“…Assessing the capacity of both ecosystems to absorb disturbances and reorganize in order to retain their functional and structural characteristics implies that both lakes have different response mechanisms. The concept of the "ecosystems resilience" (Holling, 1973) is widely accepted, but also controversial because of its definition of mechanisms and components (Carpenter et al, 2001;Scheffer et al, 2001;Walker et al, 2004;Lake, 2013). Here, we consider the "resistance" and "resilience" as different components of the ecosystems response to disturbance; by interpreting the resistance in this case as the capacity of the ecosystem to absorb and withstand the disturbance and the resilience as the capacity to reorganize and/or restore or "recover" from the disturbance (Westman, 1978;Webster et al, 1983).…”

Section: 23mentioning

confidence: 99%

Ecosystem regimes and responses in a coupled ancient lake system from MIS 5b to present: the diatom record of lakes Ohrid and Prespa

et al. 2016

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Abstract. We reconstruct the aquatic ecosystem interactions since the last interglacial period in the oldest, most diverse, hydrologically connected European lake system, by using palaeolimnological diatom and selected geochemistry data from Lake Ohrid “DEEP site” core and equivalent data from Lake Prespa core, Co1215. Driven by climate forcing, the lakes experienced two adaptive cycles during the last 92 ka: "interglacial and interstadial" and "glacial" cycle. The short-term ecosystems reorganizations, e.g. regime shifts within these cycles substantially differ between the lakes, as evident from the inferred amplitudes of variation. The deeper Lake Ohrid shifted between ultra oligo- and oligotrophic regimes in contrast to the much shallower Lake Prespa, which shifted from a deeper, (oligo-) mesotrophic to a shallower, eutrophic lake and vice versa. Due to the high level of ecosystem stability (e.g. trophic state, lake level), Lake Ohrid appears relatively resistant to external forcing, such as climate and environmental change. Recovering in a relatively short time from major climate change, Lake Prespa is a resilient ecosystem. At the DEEP site, the decoupling between the lakes' response to climate change is marked in the prolonged and gradual changes during the MIS 5/4 and 2/1 transitions. These response differences and the lakes' different physical and chemical properties may limit the influence of Lake Prespa on Lake Ohrid. Regime shifts of Lake Ohrid due to potential hydrological change in Lake Prespa are not evident in the data presented here. Moreover, a complete collapse of the ecosystems functionality and loss of their diatom communities did not happen in either lake for the period presented in the study.

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“…Normandeau et al ., 2016; Lebas et al ., 2019) and to reconstruct lake‐level fluctuations (e.g. Abbott et al ., 2000; Wagner et al ., 2014) as well as the regional tectonic and glacial history (e.g. Monecke et al ., 2004; Greenwood et al ., 2015; Gromig et al ., 2019).…”

Section: Introductionmentioning

confidence: 99%

Highly variable sediment deposition in Lake Imandra, NW Russia, since the Late Pleistocene

Lenz

Lebas

Fedorov

et al. 2021

J Quaternary Science

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To understand the dynamics of sediment deposition and the potential influences of complex current systems in large lakes, Lake Imandra (Kola Peninsula) has been investigated. Seismic and echo‐sounder data of the central part of Bolshaya Imandra reveal the sediment architecture in unprecedented detail. In addition, the sediment core data indicate highly variable depositional processes since the Late Pleistocene. The complex morphology of the lacustrine basin favoured accumulation of sediment in depressions, where they were preserved from erosion. Three main stratigraphic units (SU I–III) were identified above the acoustic basement. The oldest SU III is best preserved along a tectonic trench and interpreted as glacial deposits partly eroded by the Scandinavian Ice Sheet during Marine Isotope Stage (MIS) 2. The overlying SU II deposits are regarded as a till related to MIS 2 glaciation. The youngest SU I represents glaciofluvial, glaciolacustrine and lacustrine sediment deposited after ice retreat. As the north–south‐trending main axis of Bolshaya Imandra runs parallel to the predominant wind direction, the basin is subject to strong wind‐induced surficial currents and compensatory subsurface currents. These currents occur in water depth of 0–15 and deeper than 30 m, respectively, and their velocity prevents sediment accumulation.

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Distinct lake level lowstand in Lake Prespa (SE Europe) at the time of the 74 (75) ka Toba eruption

Cited by 10 publications

References 34 publications

Mercury records covering the past 90 kyr from lakes Prespa and Ohrid, SE Europe

Mercury records covering the past 90 kyr from lakes Prespa and Ohrid, SE Europe

Ecosystem regimes and responses in a coupled ancient lake system from MIS 5b to present: the diatom record of lakes Ohrid and Prespa

Highly variable sediment deposition in Lake Imandra, NW Russia, since the Late Pleistocene

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