The reconstruction of easterly wind directions for the Eifel region (Central Europe) during the period 40.3–12.9 ka BP

Dietrich, Stephan; Seelos, Klemens

doi:10.5194/cp-6-145-2010

Cited by 27 publications

(29 citation statements)

References 37 publications

(44 reference statements)

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“…In line with previous modeling (COHMAP Members, 1988;Ludwig et al, 2016) and fieldwork studies (Dietrich and Seelos, 2010;Krauß et al, 2016;Römer et al, the slopes of the southern and eastern EIS margins where they picked up and turned gradually into northeasters and easterlies. By blowing over the bare proglacial EIS areas, they generated dust emissions, carried the dust westwards implying dust depositions in areas west of the respective dust sources.…”

Section: Dust Cycle Hypothesissupporting

confidence: 88%

Linkage between Dust Cycle and Loess of the Last Glacial Maximum in Europe

Schaffernicht¹,

Ludwig²,

Shao³

2019

Preprint

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Abstract. This article establishes a linkage between the mineral dust cycle and loess deposits during the Last Glacial Maximum (LGM) in Europe. To this aim, we simulate the LGM dust cycle at high resolution using a regional climate-dust model. The model-simulated dust deposition rates are found to be comparable with the mass accumulation rates of the loess deposits determined from more than 70 sites. In contrast to the present-day prevailing westerlies, winds from northeast, east and southeast (36 %) and cyclonic regimes (22 %) were found to prevail over central Europe during the LGM. This supports the hypothesis that the recurring east sector winds associated with a high-pressure system over the Eurasian ice sheet (EIS) dominated the dust transport from the EIS margins in eastern and central Europe. The highest dust emission rates in Europe occurred in summer and autumn. Almost all dust was emitted from the zone between the Alps, the Black Sea and the southern EIS margin. Within this zone, the highest emission rates were located near the southernmost EIS margins corresponding to the present-day German-Polish border region. Coherent with the persistent easterlies, westwards running dust plumes resulted in high deposition rates in western Poland, northern Czechia, the Netherlands, the southern North Sea region and on the North German Plain including adjacent regions in central Germany. The agreement between the climate model simulations and the mass accumulation rates of the loess deposits corroborates the proposed LGM dust cycle hypothesis for Europe.

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Section: Dust Cycle Hypothesissupporting

confidence: 88%

Linkage between Dust Cycle and Loess of the Last Glacial Maximum in Europe

Schaffernicht¹,

Ludwig²,

Shao³

2019

Preprint

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“…The aeolian sand-sheet sediments of the Upper Senne were deposited by wind ripples on a dry surface. Reconstructed eastern to northeastern palaeowinds match with wind directions reconstructed from Lateglacial dune deposits of the eastern Senne (Hesemann 1975) and with Late Pleniglacial lake deposits of the Eifel region (Dietrich & Seelos 2010). Intercalated flashflood deposits, isolated channel-fills and three palaeosols point to ephemeral wetter phases and may reflect the climatic warming at the end of the Late Pleniglacial and/or at the beginning of the Lateglacial (Fig.…”

Section: Discussionsupporting

confidence: 53%

“…Reconstructed eastern to northeastern palaeowinds match with wind directions reconstructed from Lateglacial dune deposits of the eastern Senne (Hesemann 1975) and with Late Pleniglacial lake deposits of the Eifel region (Dietrich & Seelos 2010). Reconstructed eastern to northeastern palaeowinds match with wind directions reconstructed from Lateglacial dune deposits of the eastern Senne (Hesemann 1975) and with Late Pleniglacial lake deposits of the Eifel region (Dietrich & Seelos 2010).…”

Section: Formation Of Late Pleniglacial To Lateglacial Mixed Alluvialmentioning

confidence: 62%

Climate control on the evolution of Late Pleistocene alluvial‐fan and aeolian sand‐sheet systems in NW Germany

Meinsen

Winsemann

Roskosch

et al. 2013

Boreas

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J. 2014 (January): Climate control on the evolution of Late Pleistocene alluvial-fan and aeolian sand-sheet systems in NW Germany.The Late Pleistocene was characterized by rapid climate oscillations with alternation of warm and cold periods that lasted up to several thousand years. Although much work has been carried out on the palaeoclimate reconstruction, a direct correlation of ice-core, marine and terrestrial records is still difficult. Here we present new data from late Middle Pleniglacial to Lateglacial alluvial-fan and aeolian sand-sheet deposits in northwestern Germany. Records of Late Pleniglacial alluvial fans in central Europe are very rare, and OSL dating is used to determine the timing of fan aggradation. In contrast to fluvial systems that commonly show a delay between climate change and incision/aggradation, the small alluvial-fan systems of the Senne area responded rapidly to climatic changes and therefore act as important terrestrial climate archives for this time span. The onset of alluvial-fan deposition correlates with the climate change from warm to cold at the end of MIS 3 (29.3Ϯ3.2 ka). Strong fan progradation started at 24.4Ϯ2.8 ka and may be related to a period of higher humidity. The vertical stacking pattern of sedimentary facies and channel styles indicate a subsequrent overall decrease in water and sediment supply, with less sustained discharges and more sporadic runoffs from the catchment area, corresponding to an increasing aridity in central Europe during the Late Pleniglacial. Major phases of channel incision and fan aggradation may have been controlled by millennial-scale Dansgaard-Oeschger cycles. The incision of channel systems is attributed to unstable climate phases at cold-warm (dry-wet) or warm-cold (wet-dry) transitions. The alluvial-fan deposits are bounded by an erosion surface and are overlain by aeolian sand-sheets that were periodically affected by flash-floods. This unconformity might be correlated with the Beuningen Gravel Bed, which is an important marker horizon in deposits of the Late Pleniglacial resulting from deflation under polar desert conditions. The deposition of aeolian sand-sheet systems (19.6Ϯ2.1 to 13.1Ϯ1.5 ka) indicates a rapid increase in aridity at the end of the Late Pleniglacial. Intercalated flash-floods deposits and palaeosols (Finow type) point to temporarily wet conditions during the Lateglacial. The formation of an ephemeral channel network probably marks the warm-cold transition from the Allerød to the Younger Dryas.

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“…Windy periods like this have been reported from loess at several sites in the Pannonian Basin (e.g. Frechen et al, 1997;Marković et al, 2008) and from pelagic sediments and maar lake deposits (Rea, 1994;Dietrich and Seelos, 2010). Though deflation started in the Early Pleistocene, it was probably most intense during the Late Pleistocene, as shown by slightly increased regional denudation rates (Ruszkiczay-Rüdiger et al, in press), by climatic considerations and by the young age of large deflation hollows.…”

Section: Timing Of Yardang Formationmentioning

confidence: 91%