Geologie: Recent submissions
Anzeige der Dokumente 301-325 von 933
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Mega-monsoon variability during the late Triassic: Re-assessing the role of orbital forcing in the deposition of playa sediments in the Germanic Basin
; Kolber, Gilles; Kaboth-Bahr, Stefanie; Reinhardt, Lutz; ; Pross, Jörg (Sedimentology, 2019)
The formation of the supercontinent Pangaea during the Permo–Triassic gave rise to an extreme monsoonal climate (often termed ‘mega-monsoon’) that has been documented by numerous palaeo-records. However, considerable debate ... -
Efficiency and Accuracy of Micro-Macro Models for Mineral Dissolution
; ; ; (Water Resources Research, 2020)
Micro-macro models for dissolution processes are derived from detailed pore-scale models applying upscaling techniques. They consist of flow and transport equations at the scale of the porous medium (macroscale). Both ... -
Constraining the Variability of the Atlantic Meridional Overturning Circulation During the Holocene
; ; ; ; ; ; ; ; ; ; (Geophysical Research Letters, 2019)
There is a converging body of evidence supporting a measurable slowdown of the Atlantic Meridional Overturning Circulation (AMOC) as climate warms and Northern Hemisphere ice sheets inexorably shrink. Within this context, ... -
Recent advances in the study of Arctic submarine permafrost
; ; ; ; (Permafrost and Periglacial Processes, 2020)
Submarine permafrost is perennially cryotic earth material that lies offshore. Most submarine permafrost is relict terrestrial permafrost beneath the Arctic shelf seas, was inundated after the last glaciation, and has been ... -
Climatic and environmental changes in the Yana Highlands of north‐eastern Siberia over the last c. 57 000 years, derived from a sediment core from Lake Emanda
Baumer, Marlene M.;; ; ; Lenz, Matthias; Fedorov, Grigory; ; (Boreas, 2020-11-13)
The sediment succession of Lake Emanda in the Yana Highlands was investigated to reconstruct the regional late Quaternary climate and environmental history. Hydro‐acoustic data obtained during a field campaign in 2017 show ... -
Formation of Continental Microplates Through Rift Linkage: Numerical Modeling and Its Application to the Flemish Cap and Sao Paulo Plateau
; ; ; Heine, Christian; Welford, J. Kim (Geochemistry, Geophysics, Geosystems, 2021-04-22)
Continental microplates are enigmatic plate boundary features, which can occur in extensional and compressional regimes. Here we focus on microplate formation and their temporal evolution in continental rift settings. To ... -
Provenance and Weathering of Clays Delivered to the Bay of Bengal During the Middle Miocene: Linkages to Tectonics and Monsoonal Climate
; ; ; ; ; ; ; ; ; ; (Paleoceanography and Paleoclimatology, 2021-02-24)
Tectonics and regional monsoon strength control weathering and erosion regimes of the watersheds feeding into the Bay of Bengal, which are important contributors to global climate evolution via carbon cycle feedbacks. The ... -
Persistent Provenance of South Asian Monsoon‐Induced Silicate Weathering Over the Past 27 Million Years
; ; (Paleoceanography and Paleoclimatology, 2021-03-18)
The development of the South Asian monsoon (SAM) and Himalaya‐Tibetan Plateau uplift were closely intertwined with some studies suggesting that uplift initiated the monsoon whereas others link tectonics with monsoon‐controlled ... -
Pronounced increase in slope instability linked to global warming: A case study from the eastern European Alps
; Comiti, Francesco; (Earth Surface Processes and Landforms, 2021-03-06)
In recent decades, slope instability in high‐mountain regions has often been linked to increase in temperature and the associated permafrost degradation and/or the increase in frequency/intensity of rainstorm events. In ... -
Capillary, Film, and Vapor Flow in Transient Bare Soil Evaporation (2): Experimental Identification of Hydraulic Conductivity in the Medium to Dry Moisture Range
; ; (Water Resources Research, 2021-05-13)
Bare‐soil evaporation involves coupled flow of liquid water, water vapor, and heat. As evaporation results in non‐isothermal conditions in the soil, the temperature dependence of transport properties and thermal fluxes of ... -
Geodynamic Modeling of Lithospheric Removal and Surface Deformation: Application to Intraplate Uplift in Central Mongolia
; ; ; Hansen, Ulrich (Journal of Geophysical Research: Solid Earth, 2021-05-03)
Intraplate surface deformation is enigmatic and the underlying mechanisms responsible are not fully understood. We use thermo‐mechanical numerical modeling to explore the conditions under which lithospheric removal processes ... -
Complex Basal Conditions and Their Influence on Ice Flow at the Onset of the Northeast Greenland Ice Stream
; ; ; ; ; ; (Journal of Geophysical Research: Earth Surface, 2021-03-09)
The ice stream geometry and large ice surface velocities at the onset region of the Northeast Greenland Ice Stream (NEGIS) are not yet well reproduced by ice sheet models. The quantification of basal sliding and a ... -
Biomarker Distributions in (Sub)‐Arctic Surface Sediments and Their Potential for Sea Ice Reconstructions
; ; ; ; ; (Geochemistry, Geophysics, Geosystems, 2020-09-29)
To evaluate the present sea ice changes in a longer‐term perspective, the knowledge of sea ice variability on preindustrial and geological time scales is essential. For the interpretation of proxy reconstructions it is ... -
Loess‐Like Dust Appearance at 40 Ma in Central China
; Dupont‐Nivet, Guillaume; ; Woutersen, Amber; ; Zhang, Yang; Liu, Xiang‐Jun; ; Abels, Hemmo A.; ; ; ; ; (Paleoceanography and Paleoclimatology, 2021-03-01)
Asian mineral dust has been studied extensively for its role in affecting regional‐to global‐scale climate and for its deposits, which enable reconstructing Asian atmospheric circulation in the past. However, the timing ... -
A Volcanic Ash Layer in the Nördlinger Ries Impact Structure (Miocene, Germany): Indication of Crater Fill Geometry and Origins of Long‐Term Crater Floor Sagging
; ; Jung, Dietmar; ; ; ; Reimer, Andreas; (Journal of Geophysical Research: Planets, 2021-04-09)
Since its recognition as an impact structure 60 years ago, no volcanics were anticipated in the circular depression of the 14.8 Ma old Nördlinger Ries. Here, we describe for the first time a volcanic ash‐derived ... -
Rockwall Slope Erosion in the Northwestern Himalaya
; Owen, Lewis A.; Saha, Sourav; Hammer, Sarah J.; (Journal of Geophysical Research: Earth Surface, 2021-02-19)
Rockwall slope erosion is an important component of alpine landscape evolution, yet the role of climate and tectonics in driving this erosion remains unclear. We define the distribution and magnitude of periglacial rockwall ... -
The supercritical question for pyroclastic dune bedforms: An overview
(Sedimentology, 2021-05-07)
Sedimentary structures deposited from dilute pyroclastic currents are largely dominated by the products of metre‐scale dune bedforms containing backset lamination. Since the first seminal works in the 1970s, the vast ... -
Modelling future lahars controlled by different volcanic eruption scenarios at Cotopaxi (Ecuador) calibrated with the massively destructive 1877 lahar
; ; ; (Earth Surface Processes and Landforms, 2021-02-05)
Lahars are among the most hazardous mass flow processes on earth and have caused up to 23 000 casualties in single events in the recent past. The Cotopaxi volcano, 60 km southeast of Quito, has a well‐documented history ... -
Role of the Tropical Atlantic for the Interhemispheric Heat Transport During the Last Deglaciation
; ; ; ; ; (Paleoceanography and Paleoclimatology, 2021-05-22)
During the last deglaciation abrupt millennial‐scale perturbations of the Atlantic Meridional Overturning Circulation massively altered the interhemispheric heat distribution affecting, for example, continental ice volume ... -
Information‐Based Machine Learning for Tracer Signature Prediction in Karstic Environments
(Water Resources Research, 2020-02-03)Karstic groundwater systems are often investigated by a combination of environmental or artificial tracers. One of the major downsides of tracer‐based methods is the limited availability of tracer measurements, especially ... -
Capillary, Film, and Vapor Flow in Transient Bare Soil Evaporation (1): Identifiability Analysis of Hydraulic Conductivity in the Medium to Dry Moisture Range
; ; ; (Water Resources Research, 2021-05-13)
Evaporation experiments are frequently used to determine soil hydraulic properties. We simulated laboratory evaporation experiments with a coupled water, vapor, and heat flow model which includes the surface energy balance. ... -
Syn‐ and post‐eruptive gully formation near the Laacher See volcano
; Dotterweich, Markus; Fülling, Alexander; ; Broisch‐Höhner, Manuela; Totschnig, Ralf; Seren, Sirri; (Earth Surface Processes and Landforms, 2021-05-04)
The Laacher See volcano (LSV) is located at the western margin of the Neuwied Basin, the central part of the Middle Rhine Basin of Germany. Its paroxysmal Plinian eruption c. 13 ka ago (Laacher See event; LSE) deposited a ... -
Dating the Northwest Shelf of Australia Since the Pliocene
Groeneveld, J.;; ; (Geochemistry, Geophysics, Geosystems, 2021-03-08)
Accurate dating of marine sediments is essential to reconstruct past changes in oceanography and climate. Benthic foraminiferal oxygen isotope series from such sediments record long‐term changes in global ice volume and ... -
Sedimentology of a Late Quaternary lacustrine record from the south‐eastern Carpathian Basin
; Hambach, Ulrich; Klasen, Nicole; ; ; ; ; Obreht, Igor; ; Papadopoulou, Maria; ; Schäbitz, Frank; Gavrilov, Milivoj B.; MarkoviĆ, Slobodan B.; Vött, Andreas; (Journal of Quaternary Science, 2021-05-04)
The Upper Pleistocene geoarchives in the south‐eastern Carpathian Basin are represented predominantly by loess–palaeosol records. In 2015, a 10 m sediment core composed of clay‐rich lacustrine sediments was recovered by ... -
Impact of Sea‐Ice Model Complexity on the Performance of an Unstructured‐Mesh Sea‐Ice/Ocean Model under Different Atmospheric Forcings
; ; ; ; ; (Journal of Advances in Modeling Earth Systems, 2021-04-27)
We have equipped the unstructured‐mesh global sea‐ice and ocean model FESOM2 with a set of physical parameterizations derived from the single‐column sea‐ice model Icepack. The update has substantially broadened the range ...
