Postglacial palaeoclimatic changes in Scandinavia and Central Europe. A tentative correlation based on studies of lake level fluctuations

P. 1995 (June): Younger Dryas and early Holocene lake-level fluctuations in the Jura mountains, France. Boreas, Vol. 24, Oslo. ISSN 0300-9483.Lake-level fluctuations in the Jura mountains (France) during the Younger Dryas and the early Holocene are reconstructed using sedimentological analyses. Major transgressive phases culminated just before the Laacher See tephra deposition, at the beginning of the Younger Dryas, between 9000 and 8000 BP and between 7000 and 6000 BP. The Younger Dryas appears to be characterized by increasing dryness. Other major lowering phases occurred during the middle Allergd and during the Preboreal. A transgressive event developed between c. 9700 and 9500 BP. These palaeohydrological changes can be related to climatic oscillations reconstructed from pollen and isotopic records in Swiss lakes, from glacier movements and timberline variations in the Alps, and from isotopic records in the Greenland ice sheet.

supporting

confidence: 59%

“…During recent decades studies of past lake-level fluctuations have proved useful in Holocene palaeohydrological reconstruction (Street-Perrott & Harrison 1985;Gaillard 1985;Digerfeldt 1988;Harrison et al 1991). The Jurd Mountains with their numerous lakes offer an exceptional investigation area for such palaeoclimatic studies.…”

Section: Bowmentioning

confidence: 99%

Younger Dryas and early Holocene lake‐level fluctuations in the Jura mountains, France

Magny

Ruffaldi

1995

“…Street & Grove (1979), Street-Perrott & Harrison (1985), and Harrison & Metcalfe (1985a, b) have demonstrated the valuable information which can be obtained from interpretation of paleohydrological records at a continental scale. Gaillard (1985) has presented a tentative correlation of Holocene lake-level fluctuations in Scandinavia and some countries in central Europe. Within the compass of IGCP 158, Harrison (1987) has recently begun a compilation and interpretation of paleohydrological records at a European continental scale.…”

Section: Climatic Interpretation Of Past Lakelevel Fluctuationsmentioning

confidence: 99%

Reconstruction and regional correlation of Holocene lake‐level fluctuations in Lake Bysjön, South Sweden

Digerfeldt¹

1988

255

100

Holocene lake‐level fluctuations in Lake Bysjön are reconstructed from recorded changes in the sediment limit and the content of reworked minerogenic matter in the sediment. These recorded changes are related to past lake‐level fluctuations by correlation to fluctuations convincingly demonstrated in earlier studies. A correlation of regionally significant fluctuations in South Sweden is presented, and the climatic interpretation is discussed. A distinct lowering in lake level culminated at about 9,500‐9,200 B.P., recording a major period of drier climate in the earlier part of the Holocene. After a succeeding period of increased humidity, recorded by rising and relatively higher lake level, another major period of increased dryness began at about 6,800‐6,500 B.P. In contrast to the older period, the climate was not uniformly drier, but anumber of demonstrated lake‐level fluctuations suggest a fluctuating climate. From the reconstruction in Bysjön, dryness culminated at about 4,900‐4,600 B.P., and the major period lasted until about 2,900‐2,600 B.P. After a succeeding rise in lake level, another distinct lowering is recorded some time between 1,800 B.P. and 1,200 B.P.

“…This is confirmed by a large number of different palaeoclimatic records from various sites (e.g. Overbeck 1975;Berglund 1983;Magny 1993;Saarse 1990), particularly by lake level reconstructions from Poland, Switzerland, southern Germany, northern Italy, and Great Britain (summarized by Gaillard 1985). Implications for low lake-level stands around 3000 cal.…”

Section: Mid Holocene Development In Concert With Early Settlementmentioning

confidence: 74%

Holocene climatic variations and postglacial sea-level rise geochemically recorded in the sediments of the brackish karst lake An Loch Mór, western Ireland

Schettler¹,

Romer²,

O’Connell³

et al. 2006

Holocene climatic variations and postglacial sea-level rise geochemically recorded in the sediments of the brackish karst lake An Loch Mó r, western Ireland. Boreas, Vol. 35, pp. 674 Á693. Oslo. ISSN 0300-9483.Palaeohydrology of the brackish karst lake An Loch Mó r (Inis Oírr) was reconstructed based on its 11 600 year sedimentation record. Low calcareous early Holocene sediments, characterized by high TOC contents and deposited at generally low accumulation rates, show a gradual decrease upwards in the concentration of the siliciclastic sediment until c. 7000 cal. yr BP. From c. 9000 cal. yr BP, sediment accumulation became increasingly dominated by the deposition of autochthonous calcite and organic matter. The deposition of autochthonous calcite and its chemical composition (Ca/Sr, Ca/Mg) are determined by the subsurface inflow of freshwater from the catchment of the lake and by the balance between freshwater and seawater influx. During the early Holocene, the lake mainly received input of sea salt by sea-spray. The sediments document the further development from seasonal towards the onset of diurnal infiltration of seawater at c. 5100 cal. yr BP. At that time, the relative sea level must have risen nearly to its present level in Galway Bay. Diurnal seawater infiltration during high tides was controlled by freshwater input. Freshwater inflow from the catchment gradually increased with human impact on local vegetation (EVPT decrease). Permanent diurnal seawater infiltration in concert with this general freshwater increase made the geochemical sedimentation record highly sensitive to changes in annual precipitation. We use information from the palynological record to interpret geochemically inferred freshwater inflow variations in terms of dry and wet climatic periods and document distinct century-scale successions between wet and dry climatic episodes for western Ireland.