Late Pleistocene aeolian dust provenances and wind direction changes reconstructed by heavy mineral analysis of the sediments of the Dehner dry maar (Eifel, Germany)

Römer, Wolfgang; Lehmkuhl, Frank; Sirocko, Frank

doi:10.1016/j.gloplacha.2016.10.012

Cited by 34 publications

(32 citation statements)

References 40 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Our findings are in agreement with fieldwork-based results of Römer et al (2016), who found evidence for strong east sector winds over northern, central and western Germany for 23 to 20 ka ago. Also loess in the Harz Foreland indicates a shift to prevailing east sector winds for the LGM (Krauß et al, 2016).…”

Section: East Sector Winds and Cyclones Over Central Europesupporting

confidence: 93%

“…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: 87%

“…In agreement with this hypothesis, glacial simulations for 90 ka ago evidenced katabatic winds over the EIS (Krinner et al, 2004) and GCM simulations for the LGM indicate prevailing east sector winds over central and eastern Europe (COHMAP Members, 1988;Ludwig et al, 2016). In Germany, several aeolian sediment records that are dated to the LGM originated from more eastern sources (Dietrich and Seelos, 2010;Krauß et al, 2016;Römer et al, 2016). In contrast to the dominant present-day anticyclones and west sector winds (southwesters, westerlies and northwesters), east sector winds (36%) and cyclones 22%prevailed over central Europe during the LGM (Table 2).…”

Section: East Sector Winds and Cyclones Over Central Europementioning

confidence: 63%

See 2 more Smart Citations

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

Schaffernicht¹,

Ludwig²,

Shao³

2019

Preprint

View full text Add to dashboard Cite

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.

show abstract

Section: East Sector Winds and Cyclones Over Central Europesupporting

confidence: 93%

Section: Dust Cycle Hypothesissupporting

confidence: 87%

Section: East Sector Winds and Cyclones Over Central Europementioning

confidence: 63%

See 1 more Smart Citation

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

Schaffernicht¹,

Ludwig²,

Shao³

2019

Preprint

View full text Add to dashboard Cite

show abstract

“…These cyclones produce strong, but infrequent northwesterly winds that help to interpret the observed distribution of loess depositions in the Great Plains . The importance of loess as a climate proxy is discussed in additional studies . For the LGM winter climate, the RCM produces a substantially different atmospheric response to the LGM boundary conditions than obtained by GCM simulation .…”

Section: The Last Glacial Maximummentioning

confidence: 99%

“…81 The importance of loess as a climate proxy is discussed in additional studies. 82,83 For the LGM winter climate, the RCM produces a substantially different atmospheric response to the LGM boundary conditions than obtained by GCM simulation. 80 The RCM generates a split of the upper level flow around the blocking cyclone over the LIS that is primarily due to mechanical forcing by the LIS.…”

Section: The Last Glacial Maximummentioning

confidence: 99%

Perspectives of regional paleoclimate modeling

Ludwig

Gómez-Navarro

Pinto

et al. 2018

Annals of the New York Academy of Sciences

View full text Add to dashboard Cite

Regional climate modeling bridges the gap between the coarse resolution of current global climate models and the regional-to-local scales, where the impacts of climate change are of primary interest. Here, we present a review of the added value of the regional climate modeling approach within the scope of paleoclimate research and discuss the current major challenges and perspectives. Two time periods serve as an example: the Holocene, including the Last Millennium, and the Last Glacial Maximum. Reviewing the existing literature reveals the benefits of regional paleo climate modeling, particularly over areas with complex terrain. However, this depends largely on the variable of interest, as the added value of regional modeling arises from a more realistic representation of physical processes and climate feedbacks compared to global climate models, and this affects different climate variables in various ways. In particular, hydrological processes have been shown to be better represented in regional models, and they can deliver more realistic meteorological data to drive ice sheet and glacier modeling. Thus, regional climate models provide a clear benefit to answer fundamental paleoclimate research questions and may be key to advance a meaningful joint interpretation of climate model and proxy data.

show abstract

Source areas of the Eastern Ebro Valley loess (NE Iberian Peninsula): Heavy mineral composition as a provenance indicator

Plata

Balasch

Rodríguez

et al. 2022

Earth Surf Processes Landf

View full text Add to dashboard Cite

Loess deposits of the Eastern Ebro Valley (NE Iberian Peninsula) occupy an area of $2000 km 2 mostly on the east of the Ebro depression and locally in the M ora Basin.We studied 38 samples of loess and 47 samples of their possible source areas, in order to determine the location of the origin of the loess materials, based on their particle size distribution and composition of heavy minerals. Our results clearly differentiate two depositional loess basins disconnected by the reliefs of the Pre-Coastal Range with different mineralogical signatures: the Ebro Basin and the M ora Basin. The most relevant variables to discern source areas were the percentage of heavy minerals, the concentrations of zircon, staurolite, rutile and inosilicates, and the presence of gypsum. In the Ebro Basin, the largest set of loess deposits is located around a depocenter in the Batea region and along several lateral areas, with materials that come from the central alluvial plain of the Middle Ebro River (25 to >100 km travel distance), in addition to deflated materials from Miocene interfluvial substrates. On the other hand, loess deposits of the M ora Basin come from more proximal source areas (<15 km), originating from the alluvial materials of the Lower Ebro River that contain the contributions of its tributaries, the Cinca and Segre rivers.Taking into account the homogeneity in the mineralogical composition of complex loess sequences, we deduced a general WNW-ESE wind direction, which would have remained constant over the last two cold periods (MIS-2 and MIS-6). Along this axis, the Pàndols-Cavalls Range, with a height difference of 200-350 m, acted as a wind barrier separating the loess of Ebro Basin from the loess of M ora Basin.

show abstract

Late Pleistocene aeolian dust provenances and wind direction changes reconstructed by heavy mineral analysis of the sediments of the Dehner dry maar (Eifel, Germany)

Cited by 34 publications

References 40 publications

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

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

Perspectives of regional paleoclimate modeling

Source areas of the Eastern Ebro Valley loess (NE Iberian Peninsula): Heavy mineral composition as a provenance indicator

Contact Info

Product

Resources

About