Articles | Volume 69, issue 2
https://doi.org/10.5194/egqsj-69-121-2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/egqsj-69-121-2020
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
the Creative Commons Attribution 4.0 License.
Research article
| 
25 Sep 2020
Research article |
| 25 Sep 2020
| 25 Sep 2020
Anthropogenic and climate signals in late-Holocene peat layers of an ombrotrophic bog in the Styrian Enns valley (Austrian Alps)
Wolfgang Knierzinger
CORRESPONDING AUTHOR
Department of Geodynamics and Sedimentology, University of Vienna,
Althanstraße 14, 1090 Vienna, Austria
Ruth Drescher-Schneider
Schillingsdorfer Straße 27, 8010 Kainbach bei Graz, Austria
Klaus-Holger Knorr
Ecohydrology and Biogeochemistry Group, Institute of Landscape Ecology, University of Münster,
Heisenbergstraße 2, 48149 Münster, Germany
Simon Drollinger
Department of Physical Geography, University of Göttingen, Goldschmidtstraße 5, 37077 Göttingen, Germany
Andreas Limbeck
Institute of Chemical Technologies and Analytics, Technical University Vienna, Getreidemarkt 9, 1060 Vienna, Austria
Lukas Brunnbauer
Institute of Chemical Technologies and Analytics, Technical University Vienna, Getreidemarkt 9, 1060 Vienna, Austria
Felix Horak
Institute of Chemical Technologies and Analytics, Technical University Vienna, Getreidemarkt 9, 1060 Vienna, Austria
Daniela Festi
Institute for Interdisciplinary Mountain Research, Austrian
Academy of Sciences, Technikerstraße 21a, 6020 Innsbruck, Austria
Michael Wagreich
Department of Geodynamics and Sedimentology, University of Vienna,
Althanstraße 14, 1090 Vienna, Austria
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Henning Teickner, Edzer Pebesma, and Klaus-Holger Knorr
EGUsphere, https://doi.org/10.5194/egusphere-2024-1739, https://doi.org/10.5194/egusphere-2024-1739, 2024
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The Holocene Peatland Model (HPM) is a widely used peatland model to understand and predict long-term peatland dynamics. Here, we test whether the HPM can predict Sphagnum litterbag decomposition rates from oxic to anoxic conditions. Our results indicate that decomposition rates change more gradually from oxic to anoxic conditions and may be underestimated under anoxic conditions, possibly because the effect of water table fluctuations on decomposition rates is not considered.
Marian Schönauer, Anneli M. Ågren, Klaus Katzensteiner, Florian Hartsch, Paul Arp, Simon Drollinger, and Dirk Jaeger
Hydrol. Earth Syst. Sci., 28, 2617–2633, https://doi.org/10.5194/hess-28-2617-2024, https://doi.org/10.5194/hess-28-2617-2024, 2024
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This work employs innovative spatiotemporal modeling to predict soil moisture, with implications for sustainable forest management. By correlating predicted soil moisture with rut depth, it addresses a critical concern of soil damage and ecological impact – and its prevention through adequate planning of forest operations.
Henning Teickner, Edzer Pebesma, and Klaus-Holger Knorr
EGUsphere, https://doi.org/10.5194/egusphere-2024-1686, https://doi.org/10.5194/egusphere-2024-1686, 2024
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Decomposition rates for Sphagnum mosses, the main peat forming plants in northern peatlands, are often derived from litterbag experiments. Here, we estimate initial leaching losses from available Sphagnum litterbag experiments and analyze how decomposition rates are biased when initial leaching losses are ignored. Our analyses indicate that initial leaching losses range between 3 to 18 mass-% and that this may result in overestimated mass losses when extrapolated to several decades.
Carrie L. Thomas, Boris Jansen, Sambor Czerwiński, Mariusz Gałka, Klaus-Holger Knorr, E. Emiel van Loon, Markus Egli, and Guido L. B. Wiesenberg
Biogeosciences, 20, 4893–4914, https://doi.org/10.5194/bg-20-4893-2023, https://doi.org/10.5194/bg-20-4893-2023, 2023
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Peatlands are vital terrestrial ecosystems that can serve as archives, preserving records of past vegetation and climate. We reconstructed the vegetation history over the last 2600 years of the Beerberg peatland and surrounding area in the Thuringian Forest in Germany using multiple analyses. We found that, although the forest composition transitioned and human influence increased, the peatland remained relatively stable until more recent times, when drainage and dust deposition had an impact.
Laura Clark, Ian B. Strachan, Maria Strack, Nigel T. Roulet, Klaus-Holger Knorr, and Henning Teickner
Biogeosciences, 20, 737–751, https://doi.org/10.5194/bg-20-737-2023, https://doi.org/10.5194/bg-20-737-2023, 2023
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We determine the effect that duration of extraction has on CO2 and CH4 emissions from an actively extracted peatland. Peat fields had high net C emissions in the first years after opening, and these then declined to half the initial value for several decades. Findings contribute to knowledge on the atmospheric burden that results from these activities and are of use to industry in their life cycle reporting and government agencies responsible for greenhouse gas accounting and policy.
Niccolò Maffezzoli, Eliza Cook, Willem G. M. van der Bilt, Eivind N. Støren, Daniela Festi, Florian Muthreich, Alistair W. R. Seddon, François Burgay, Giovanni Baccolo, Amalie R. F. Mygind, Troels Petersen, Andrea Spolaor, Sebastiano Vascon, Marcello Pelillo, Patrizia Ferretti, Rafael S. dos Reis, Jefferson C. Simões, Yuval Ronen, Barbara Delmonte, Marco Viccaro, Jørgen Peder Steffensen, Dorthe Dahl-Jensen, Kerim H. Nisancioglu, and Carlo Barbante
The Cryosphere, 17, 539–565, https://doi.org/10.5194/tc-17-539-2023, https://doi.org/10.5194/tc-17-539-2023, 2023
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Multiple lines of research in ice core science are limited by manually intensive and time-consuming optical microscopy investigations for the detection of insoluble particles, from pollen grains to volcanic shards. To help overcome these limitations and support researchers, we present a novel methodology for the identification and autonomous classification of ice core insoluble particles based on flow image microscopy and neural networks.
Matthias Koschorreck, Klaus Holger Knorr, and Lelaina Teichert
Biogeosciences, 19, 5221–5236, https://doi.org/10.5194/bg-19-5221-2022, https://doi.org/10.5194/bg-19-5221-2022, 2022
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At low water levels, parts of the bottom of rivers fall dry. These beaches or mudflats emit the greenhouse gas carbon dioxide (CO2) to the atmosphere. We found that those emissions are caused by microbial reactions in the sediment and that they change with time. Emissions were influenced by many factors like temperature, water level, rain, plants, and light.
Henning Teickner and Klaus-Holger Knorr
SOIL, 8, 699–715, https://doi.org/10.5194/soil-8-699-2022, https://doi.org/10.5194/soil-8-699-2022, 2022
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The chemical quality of biomass can be described with holocellulose (relatively easily decomposable by microorganisms) and Klason lignin (relatively recalcitrant) contents. Measuring both is laborious. In a recent study, models have been proposed which can predict both quicker from mid-infrared spectra. However, it has not been analyzed if these models make correct predictions for biomass in soils and how to improve them. We provide such a validation and a strategy for their improvement.
Daniela Kau, Marion Greilinger, Bernadette Kirchsteiger, Aron Göndör, Christopher Herzig, Andreas Limbeck, Elisabeth Eitenberger, and Anne Kasper-Giebl
Atmos. Meas. Tech., 15, 5207–5217, https://doi.org/10.5194/amt-15-5207-2022, https://doi.org/10.5194/amt-15-5207-2022, 2022
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The use of thermal–optical analysis for the determination of elemental carbon (EC) and organic carbon (OC) can be biased by mineral dust (MD). We present a method that utilizes this interference to quantify iron contained in MD in snow samples. Possibilities and limitations of applying this method to particulate matter samples are presented. The influence of light-absorbing iron compounds in MD on the transmittance signal can be used to identify samples experiencing a bias of the OC / EC split.
Cordula Nina Gutekunst, Susanne Liebner, Anna-Kathrina Jenner, Klaus-Holger Knorr, Viktoria Unger, Franziska Koebsch, Erwin Don Racasa, Sizhong Yang, Michael Ernst Böttcher, Manon Janssen, Jens Kallmeyer, Denise Otto, Iris Schmiedinger, Lucas Winski, and Gerald Jurasinski
Biogeosciences, 19, 3625–3648, https://doi.org/10.5194/bg-19-3625-2022, https://doi.org/10.5194/bg-19-3625-2022, 2022
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Methane emissions decreased after a seawater inflow and a preceding drought in freshwater rewetted coastal peatland. However, our microbial and greenhouse gas measurements did not indicate that methane consumers increased. Rather, methane producers co-existed in high numbers with their usual competitors, the sulfate-cycling bacteria. We studied the peat soil and aimed to cover the soil–atmosphere continuum to better understand the sources of methane production and consumption.
Liam Heffernan, Maria A. Cavaco, Maya P. Bhatia, Cristian Estop-Aragonés, Klaus-Holger Knorr, and David Olefeldt
Biogeosciences, 19, 3051–3071, https://doi.org/10.5194/bg-19-3051-2022, https://doi.org/10.5194/bg-19-3051-2022, 2022
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Permafrost thaw in peatlands leads to waterlogged conditions, a favourable environment for microbes producing methane (CH4) and high CH4 emissions. High CH4 emissions in the initial decades following thaw are due to a vegetation community that produces suitable organic matter to fuel CH4-producing microbes, along with warm and wet conditions. High CH4 emissions after thaw persist for up to 100 years, after which environmental conditions are less favourable for microbes and high CH4 emissions.
Ramona J. Heim, Andrey Yurtaev, Anna Bucharova, Wieland Heim, Valeriya Kutskir, Klaus-Holger Knorr, Christian Lampei, Alexandr Pechkin, Dora Schilling, Farid Sulkarnaev, and Norbert Hölzel
Biogeosciences, 19, 2729–2740, https://doi.org/10.5194/bg-19-2729-2022, https://doi.org/10.5194/bg-19-2729-2022, 2022
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Fires will probably increase in Arctic regions due to climate change. Yet, the long-term effects of tundra fires on carbon (C) and nitrogen (N) stocks and cycling are still unclear. We investigated the long-term fire effects on C and N stocks and cycling in soil and aboveground living biomass.
We found that tundra fires did not affect total C and N stocks because a major part of the stocks was located belowground in soils which were largely unaltered by fire.
Paolo Gabrielli, Theo Manuel Jenk, Michele Bertó, Giuliano Dreossi, Daniela Festi, Werner Kofler, Mai Winstrup, Klaus Oeggl, Margit Schwikowski, Barbara Stenni, and Carlo Barbante
Clim. Past Discuss., https://doi.org/10.5194/cp-2022-20, https://doi.org/10.5194/cp-2022-20, 2022
Revised manuscript not accepted
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We present a methodology that reduces the chronological uncertainty of an Alpine ice core record from the glacier Alto dell’Ortles, Italy. This chronology will allow the constraint of the Holocene climatic and environmental histories emerging from this archive of Central Europe. This method will allow to obtain accurate chronologies also from other ice cores from-low latitude/high-altitude glaciers that typically suffer from larger dating uncertainties compared with well dated polar records.
Daniela Festi, Margit Schwikowski, Valter Maggi, Klaus Oeggl, and Theo Manuel Jenk
The Cryosphere, 15, 4135–4143, https://doi.org/10.5194/tc-15-4135-2021, https://doi.org/10.5194/tc-15-4135-2021, 2021
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In our study we dated a 46 m deep ice core retrieved from the Adamello glacier (Central Italian Alps). We obtained a timescale combining the results of radionuclides 210Pb and 137Cs with annual layer counting derived from pollen and refractory black carbon concentrations. Our results indicate that the surface of the glacier is older than the drilling date of 2016 by about 20 years, therefore revealing that the glacier is at high risk of collapsing under current climate warming conditions.
Leandra Stephanie Emilia Praetzel, Nora Plenter, Sabrina Schilling, Marcel Schmiedeskamp, Gabriele Broll, and Klaus-Holger Knorr
Biogeosciences, 17, 5057–5078, https://doi.org/10.5194/bg-17-5057-2020, https://doi.org/10.5194/bg-17-5057-2020, 2020
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Small lakes are important but variable sources of greenhouse gas emissions. We performed lab experiments to determine spatial patterns and drivers of CO2 and CH4 emission and sediment gas production within a lake. The observed high spatial variability of emissions and production could be explained by the degradability of the sediment organic matter. We did not see correlations between production and emissions and suggest on-site flux measurements as the most accurate way for determing emissions.
Wiebke Münchberger, Klaus-Holger Knorr, Christian Blodau, Verónica A. Pancotto, and Till Kleinebecker
Biogeosciences, 16, 541–559, https://doi.org/10.5194/bg-16-541-2019, https://doi.org/10.5194/bg-16-541-2019, 2019
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Processes governing CH4 dynamics have been scarcely studied in southern hemispheric bogs. These can be dominated by cushion-forming plants with deep and dense roots suppressing emissions. Here we demonstrate how the spatial distribution of root activity drives a pronounced pattern of CH4 emissions, likewise also possible in densely rooted northern bogs. We conclude that presence of cushion vegetation as a proxy for negligible CH4 emissions from cushion bogs needs to be interpreted with caution.
Xi Wen, Viktoria Unger, Gerald Jurasinski, Franziska Koebsch, Fabian Horn, Gregor Rehder, Torsten Sachs, Dominik Zak, Gunnar Lischeid, Klaus-Holger Knorr, Michael E. Böttcher, Matthias Winkel, Paul L. E. Bodelier, and Susanne Liebner
Biogeosciences, 15, 6519–6536, https://doi.org/10.5194/bg-15-6519-2018, https://doi.org/10.5194/bg-15-6519-2018, 2018
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Rewetting drained peatlands may lead to prolonged emission of the greenhouse gas methane, but the underlying factors are not well described. In this study, we found two rewetted fens with known high methane fluxes had a high ratio of microbial methane producers to methane consumers and a low abundance of methane consumers compared to pristine wetlands. We therefore suggest abundances of methane-cycling microbes as potential indicators for prolonged high methane emissions in rewetted peatlands.
Sina Berger, Leandra S. E. Praetzel, Marie Goebel, Christian Blodau, and Klaus-Holger Knorr
Biogeosciences, 15, 885–903, https://doi.org/10.5194/bg-15-885-2018, https://doi.org/10.5194/bg-15-885-2018, 2018
Tanja Broder, Klaus-Holger Knorr, and Harald Biester
Hydrol. Earth Syst. Sci., 21, 2035–2051, https://doi.org/10.5194/hess-21-2035-2017, https://doi.org/10.5194/hess-21-2035-2017, 2017
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This study elucidates controls on temporal variability in DOM concentration and quality in stream water draining a bog and a forested peaty riparian zone, particularly considering drought and storm flow events. DOM quality was monitored using spectrofluorometric indices (SUVA254, SR and FI) and PARAFAC modeling of EEMs. DOM quality depended clearly on hydrologic preconditions and season. Moreover, the forested peaty riparian zone generated most variability in headwater DOM quantity and quality.
Daniela Festi, Luca Carturan, Werner Kofler, Giancarlo dalla Fontana, Fabrizio de Blasi, Federico Cazorzi, Edith Bucher, Volkmar Mair, Paolo Gabrielli, and Klaus Oeggl
The Cryosphere, 11, 937–948, https://doi.org/10.5194/tc-11-937-2017, https://doi.org/10.5194/tc-11-937-2017, 2017
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We propose a sub-seasonal timescale based on pollen analyses for a Mt. Ortles firn core. The method can be applied to all types of glaciers, provided the proximity of the pollen source and a negligible time lag between pollen production and its deposition on the glacier. By combining pollen dating with a mass balance model we found evidence that pollen grains are resilient to downward transport by percolating water and that pollen shows a high potential for inferring past climatic conditions.
Paolo Gabrielli, Carlo Barbante, Giuliano Bertagna, Michele Bertó, Daniel Binder, Alberto Carton, Luca Carturan, Federico Cazorzi, Giulio Cozzi, Giancarlo Dalla Fontana, Mary Davis, Fabrizio De Blasi, Roberto Dinale, Gianfranco Dragà, Giuliano Dreossi, Daniela Festi, Massimo Frezzotti, Jacopo Gabrieli, Stephan P. Galos, Patrick Ginot, Petra Heidenwolf, Theo M. Jenk, Natalie Kehrwald, Donald Kenny, Olivier Magand, Volkmar Mair, Vladimir Mikhalenko, Ping Nan Lin, Klaus Oeggl, Gianni Piffer, Mirko Rinaldi, Ulrich Schotterer, Margit Schwikowski, Roberto Seppi, Andrea Spolaor, Barbara Stenni, David Tonidandel, Chiara Uglietti, Victor Zagorodnov, Thomas Zanoner, and Piero Zennaro
The Cryosphere, 10, 2779–2797, https://doi.org/10.5194/tc-10-2779-2016, https://doi.org/10.5194/tc-10-2779-2016, 2016
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New ice cores were extracted from Alto dell'Ortles, the highest glacier of South Tyrol in the Italian Alps, to check whether prehistoric ice, which is coeval to the famous 5300-yr-old Tyrolean Iceman, is still preserved in this region. Dating of the ice cores confirms the hypothesis and indicates the drilling site has been glaciated since the end of the Northern Hemisphere Climatic Optimum (7000 yrs BP). We also infer that an unprecedented acceleration of the glacier flow has recently begun.
H. Biester, K.-H. Knorr, J. Schellekens, A. Basler, and Y.-M. Hermanns
Biogeosciences, 11, 2691–2707, https://doi.org/10.5194/bg-11-2691-2014, https://doi.org/10.5194/bg-11-2691-2014, 2014
S. Strohmeier, K.-H. Knorr, M. Reichert, S. Frei, J. H. Fleckenstein, S. Peiffer, and E. Matzner
Biogeosciences, 10, 905–916, https://doi.org/10.5194/bg-10-905-2013, https://doi.org/10.5194/bg-10-905-2013, 2013
K.-H. Knorr
Biogeosciences, 10, 891–904, https://doi.org/10.5194/bg-10-891-2013, https://doi.org/10.5194/bg-10-891-2013, 2013
C. Estop-Aragonés, K.-H. Knorr, and C. Blodau
Biogeosciences, 10, 421–436, https://doi.org/10.5194/bg-10-421-2013, https://doi.org/10.5194/bg-10-421-2013, 2013
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Investigating the loess–palaeosol sequence of Bahlingen-Schönenberg (Kaiserstuhl), southwestern Germany, using a multi-methodological approach
Holocene vegetation reconstruction in the forest–steppe of Mongolia based on leaf waxes and macro-charcoals in soils
Evaluation of geochemical proxies and radiocarbon data from a loess record of the Upper Palaeolithic site Kammern-Grubgraben, Lower Austria
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E&G Quaternary Sci. J., 73, 23–40, https://doi.org/10.5194/egqsj-73-23-2024, https://doi.org/10.5194/egqsj-73-23-2024, 2024
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In reconstructing the living conditions of the late ice age and the early warm periods, archaeologists rely on palaeobotany. Since the 1940s, there has been the common image of a treeless tundra, which changes to a light birch forest within only a few years at the transition between the periods. By using environmental data, it is demonstrated that this image must be refined, and examples are given for a better understanding of palaeobotanical data and their use in archaeological reconstructions.
Nora Pfaffner, Annette Kadereit, Volker Karius, Thomas Kolb, Sebastian Kreutzer, and Daniela Sauer
E&G Quaternary Sci. J., 73, 1–22, https://doi.org/10.5194/egqsj-73-1-2024, https://doi.org/10.5194/egqsj-73-1-2024, 2024
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We present results of the Baix loess–palaeosol sequence, SE France. Reconstructed intense soil formation under warm, moist conditions before and into the last ice age and less intense soil formations in warm (temporarily moist) phases during the generally cold, dry ice age were validated with laboratory and dating techniques. This is particularly relevant as Baix is located in the temperate–Mediterranean climate transition zone, a sensitive zone that is susceptible to future climate changes.
Sudip Acharya, Maximilian Prochnow, Thomas Kasper, Linda Langhans, Peter Frenzel, Paul Strobel, Marcel Bliedtner, Gerhard Daut, Christopher Berndt, Sönke Szidat, Gary Salazar, Antje Schwalb, and Roland Zech
E&G Quaternary Sci. J., 72, 219–234, https://doi.org/10.5194/egqsj-72-219-2023, https://doi.org/10.5194/egqsj-72-219-2023, 2023
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This study presents a palaeoenvironmental record from Lake Höglwörth, Bavaria, Germany. Before 870 CE peat deposits existed. Erosion increased from 1240 to 1380 CE, followed by aquatic productivity and anoxia from 1310 to 1470 CE. Increased allochthonous input and a substantial shift in the aquatic community in 1701 were caused by construction of a mill. Recent anoxia has been observed since the 1960s.
Jacob Hardt, Nadav Nir, Christopher Lüthgens, Thomas M. Menn, and Brigitta Schütt
E&G Quaternary Sci. J., 72, 37–55, https://doi.org/10.5194/egqsj-72-37-2023, https://doi.org/10.5194/egqsj-72-37-2023, 2023
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We investigated the geomorphological and geological characteristics of the archaeological sites Hawelti–Melazo and the surroundings. We performed sedimentological analyses, as well as direct (luminescence) and indirect (radiocarbon) sediment dating, to reconstruct the palaeoenvironmental conditions, which we integrated into the wider context of Tigray.
Lea Schwahn, Tabea Schulze, Alexander Fülling, Christian Zeeden, Frank Preusser, and Tobias Sprafke
E&G Quaternary Sci. J., 72, 1–21, https://doi.org/10.5194/egqsj-72-1-2023, https://doi.org/10.5194/egqsj-72-1-2023, 2023
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The loess sequence of Köndringen, Upper Rhine Graben, comprises several glacial–interglacial cycles. It has been investigated using a multi-method approach including the measurement of colour, grain size, organic matter, and carbonate content. The analyses reveal that the sequence comprises several fossil soils and layers of reworked soil material. According to luminescence dating, it reaches back more than 500 000 years.
Max Engel, Felix Henselowsky, Fabian Roth, Annette Kadereit, Manuel Herzog, Stefan Hecht, Susanne Lindauer, Olaf Bubenzer, and Gerd Schukraft
E&G Quaternary Sci. J., 71, 213–226, https://doi.org/10.5194/egqsj-71-213-2022, https://doi.org/10.5194/egqsj-71-213-2022, 2022
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The late-glacial Bergstraßenneckar is a former course of the Neckar River in the Upper Rhine Graben of southwest Germany at a time when the confluence with the Rhine river was 50 km further to the north. The former river bends are still visible in topographic maps and satellite imagery. Sediment cores and geophysical measurements from the former river channels let us reconstruct the shift from a running river to silting-up meanders and permit us to date this to ca. 11 000 to 10 500 years ago.
Tabea Schulze, Lea Schwahn, Alexander Fülling, Christian Zeeden, Frank Preusser, and Tobias Sprafke
E&G Quaternary Sci. J., 71, 145–162, https://doi.org/10.5194/egqsj-71-145-2022, https://doi.org/10.5194/egqsj-71-145-2022, 2022
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A loess sequence in SW Germany was investigated using a high-resolution multi-method approach. It dates to 34–27 ka and comprises layers of initial soil formation. Drier conditions and a different atmospheric circulation pattern during the time of deposition are expected as the soil layers are less strongly developed compared to similar horizons further north. Dust accumulation predates the last advance of Alpine glaciers, and no loess deposition is recorded for the time of maximum ice extent.
Marcel Lerch, Julia Unkelbach, Florian Schneider, Michael Zech, and Michael Klinge
E&G Quaternary Sci. J., 71, 91–110, https://doi.org/10.5194/egqsj-71-91-2022, https://doi.org/10.5194/egqsj-71-91-2022, 2022
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Charcoals and leaf waxes from vegetation accumulate in the soil and provide information about past vegetation because they are mostly resistant against physical and biological degradation. Analyzing and comparing ratios of both element types helped us to improve the evidence for vegetation reconstruction. We found that the accumulation processes and preservation of these elements depend on different environmental conditions at forest- and steppe-dominated sites in the Mongolian forest–steppe.
Lilian Reiss, Christian Stüwe, Thomas Einwögerer, Marc Händel, Andreas Maier, Stefan Meng, Kerstin Pasda, Ulrich Simon, Bernd Zolitschka, and Christoph Mayr
E&G Quaternary Sci. J., 71, 23–43, https://doi.org/10.5194/egqsj-71-23-2022, https://doi.org/10.5194/egqsj-71-23-2022, 2022
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We aim at testing and evaluating geochemical proxies and material for radiocarbon dating for their reliability and consistency at the Palaeolithic site Kammern-Grubgraben (Lower Austria). While carbonate and organic carbon contents are interpreted in terms of palaeoclimate variability, pedogenic carbonates turned out to be of Holocene age. As a consequence, the proxy data assessed here are differentially suitable for environmental reconstructions.
Carlos A. Góis-Marques
E&G Quaternary Sci. J., 70, 197–199, https://doi.org/10.5194/egqsj-70-197-2021, https://doi.org/10.5194/egqsj-70-197-2021, 2021
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Palaeobotanical research on oceanic islands has been largely ignored despite its importance for providing empirical proofs to disentangle insular plant diversity, evolution, ecology and biogeography. Here we explore the oceanic archipelagos of Madeira and the Azores to demonstrate the existence of well-preserved and palaeobiologically informative plant fossils.
Christian Zeeden, Jehangeer Ahmad Mir, Mathias Vinnepand, Christian Laag, Christian Rolf, and Reyaz Ahmad Dar
E&G Quaternary Sci. J., 70, 191–195, https://doi.org/10.5194/egqsj-70-191-2021, https://doi.org/10.5194/egqsj-70-191-2021, 2021
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We investigate two loess–palaeosol sequences in Kashmir. Magnetic enhancement of the loess was strong during stadial phases. Besides classical magnetic enhancement, wind vigour suggests partly strong winds. Grain sizes are dominantly in the silt range and comparable to data from central Asia, which do not suggest transport over high mountain ranges as required for non-local sources in Kashmir. Therefore, we suggest that the Kashmir loess is predominantly of local origin.
Christopher-Bastian Roettig
E&G Quaternary Sci. J., 69, 161–163, https://doi.org/10.5194/egqsj-69-161-2020, https://doi.org/10.5194/egqsj-69-161-2020, 2020
Joana Seguin, Pavlos Avramidis, Annette Haug, Torben Kessler, Arndt Schimmelmann, and Ingmar Unkel
E&G Quaternary Sci. J., 69, 165–186, https://doi.org/10.5194/egqsj-69-165-2020, https://doi.org/10.5194/egqsj-69-165-2020, 2020
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We present two new palaeolake archives of Pheneos and Kaisari, Peloponnese, and compare them with records from Stymphalia and Asea by applying the same set of analyses to all sites. We focus on different spatial scales to estimate the validity range of the proxy signals. Geochemical ratios depict hydrological variation and environmental changes over the last 5000 years. They indicate drier phases, but timing and duration vary, which may be explained by site-specific ecosystem responses.
Lutz Schirrmeister, Elisabeth Dietze, Heidrun Matthes, Guido Grosse, Jens Strauss, Sebastian Laboor, Mathias Ulrich, Frank Kienast, and Sebastian Wetterich
E&G Quaternary Sci. J., 69, 33–53, https://doi.org/10.5194/egqsj-69-33-2020, https://doi.org/10.5194/egqsj-69-33-2020, 2020
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Late Pleistocene Yedoma deposits of Siberia and Alaska are prone to degradation with warming temperatures.
Multimodal grain-size distributions of >700 samples indicate varieties of sediment production, transport, and deposition.
These processes were disentangled using robust endmember modeling analysis.
Nine robust grain-size endmembers characterize these deposits.
The data set was finally classified using cluster analysis.
The polygenetic Yedoma origin is proved.
Michael O'Connell, Karen Molloy, and Eneda Jennings
E&G Quaternary Sci. J., 69, 1–32, https://doi.org/10.5194/egqsj-69-1-2020, https://doi.org/10.5194/egqsj-69-1-2020, 2020
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Long-term environmental change in Co. Mayo, on the mid-Atlantic seaboard of Ireland, is discussed. Pollen diagrams and bog pine, dated by 14C and dendrochronology, provide evidence for woodlands, farming and climate change. Intensive farming is dated to the early Neolithic (3800–3400 BC) prior to wide-scale spread of blanket bog. Construction of the peat-covered, stone-wall field system at Céide Fields occurred at this time which is unexpectedly early. Bronze and Iron Age activity is detailed.
Betelhem Mekonnen, Wolfgang Zech, Bruno Glaser, Bruk Lemma, Tobias Bromm, Sileshi Nemomissa, Tamrat Bekele, and Michael Zech
E&G Quaternary Sci. J., 68, 177–188, https://doi.org/10.5194/egqsj-68-177-2019, https://doi.org/10.5194/egqsj-68-177-2019, 2019
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The study evaluates the ability of stable isotopes (δ13C and δ15N) and sugar biomarkers to distinguish Erica from the dominant vegetation of the Bale Mountains in order to reconstruct the past extent of Erica on the Sanetti Plateau. No significant differences in stable isotopes are found between the dominant plant species. Although Erica is characterized by quite high (G+M)/(A+X) ratios, it cannot be unambiguously distinguished from other plants due to degradation and soil microbial effects.
Bruk Lemma, Betelhem Mekonnen, Bruno Glaser, Wolfgang Zech, Sileshi Nemomissa, Tamrat Bekele, Lucas Bittner, and Michael Zech
E&G Quaternary Sci. J., 68, 189–200, https://doi.org/10.5194/egqsj-68-189-2019, https://doi.org/10.5194/egqsj-68-189-2019, 2019
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Chemotaxonomic identification of keystone plant species in the Bale Mountains are possible using lignin phenols. However, Erica could not be differentiated chemotaxonomically from all other investigated plants using n-alkanes. Unambiguous characteristic patterns of lignin phenols reflected in the plant samples were not sustained in the organic layers and mineral topsoils. This is due to degradation and organic matter inputs by roots. Therefore, the past extent of Erica is still speculative.
Hannes Laermanns, Simon Matthias May, Daniel Kelterbaum, Giorgi Kirkitadze, Stephan Opitz, Levan Navrozashvili, Mikheil Elashvili, and Helmut Brückner
E&G Quaternary Sci. J., 68, 119–139, https://doi.org/10.5194/egqsj-68-119-2019, https://doi.org/10.5194/egqsj-68-119-2019, 2019
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The landscape on the Black Sea coast of Georgia has changed significantly during the last few millennia. By using granulometric and geochemical analyses, we reconstructed significant sea level, coastline and palaeoenvironmental changes that have taken place in the surroundings of the Supsa fan since at least 4000 BCE.
Elisabeth Dietze and Michael Dietze
E&G Quaternary Sci. J., 68, 29–46, https://doi.org/10.5194/egqsj-68-29-2019, https://doi.org/10.5194/egqsj-68-29-2019, 2019
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Sedimentary deposits provide insights into past Earth surface dynamics via the size distribution of mineral grains documenting the erosion, transport and deposition history. This study introduces structured procedures to decipher the distinct grain-size distributions of sediment samples that were mixed during/after deposition, using the free statistical tool EMMAgeo. Compared with other algorithms, EMMAgeo is unique as it provides uncertainty estimates and allows expert knowledge to be included.
Clemens von Scheffer, Annika Lange, François De Vleeschouwer, Joachim Schrautzer, and Ingmar Unkel
E&G Quaternary Sci. J., 68, 13–28, https://doi.org/10.5194/egqsj-68-13-2019, https://doi.org/10.5194/egqsj-68-13-2019, 2019
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By using geochemical and pollen data, this study wanted to close knowledge gaps on the interconnection of climate, environment and human impact in the Kleinwalser Valley (Kleinwalsertal, northern central Alps) over the past 6200 years. For a long time, the Walser people were believed to be the first settlers, who cultivated the valley. However, humans have recurrently used and modified the landscape for at least 5500 years by burning or cutting down forests and practicing pasture management.
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Short summary
We present multi-proxy analyses of a 14C-dated peat core covering the past ⁓5000 years from the ombrotrophic Pürgschachen Moor. Pronounced increases in cultural indicators suggest significant human activity in the Bronze Age and in the period of the late La Tène culture. We found strong, climate-controlled interrelations between the pollen record, the humification degree and the ash content. Human activity is reflected in the pollen record and by heavy metals.
We present multi-proxy analyses of a 14C-dated peat core covering the past ⁓5000 years from the...
