Fate of pharmaceutical micro-pollutants in Lake Tegel (Berlin,Germany): the impact of lake-specific mechanisms     

Sebastian Schimmelpfennig  Georgiy Kirillin  Christof Engelhardt  Uwe Dünnbier  Gunnar Nützmann 《Environmental Earth Sciences》2016,75(10):893

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Simulation of temperature effects on groundwater flow,contaminant dissolution,transport and biodegradation due to shallow geothermal use   总被引：1，自引：0，他引：1  

Christof Beyer  Steffi Popp  Sebastian Bauer 《Environmental Earth Sciences》2016,75(18):1244

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Destination cities of European exchange students     

Christof Van Mol  Peter Ekamper 《Geografisk tidskrift / udgivet af Bestyrelsen for Det Kongelige danske geografiske selskab》2016,116(1):85-91

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Depletion-induced seismicity in NW-Germany: lessons from comprehensive investigations     

Gudehus  Gerd  Lempp  Christof  Scheffzük  Christian  Műller  Birgit I.  Schilling  Frank R. 《Acta Geotechnica》2023,18(2):951-969

Acta Geotechnica - Evaluating various investigations for north-German gas fields, we discuss past and actual evolutions of the rock fabric in the light of dilatant driven and spontaneous...  相似文献   

Soil formation and weathering in a permafrost environment of the Swiss Alps: a multi‐parameter and non‐steady‐state approach          下载免费PDF全文

Barbara Zollinger  Christine Alewell  Christof Kneisel  Dagmar Brandová  Marta Petrillo  Michael Plötze  Marcus Christl  Markus Egli 《地球表面变化过程与地形》2017,42(5):814-835

Spatially discontinuous permafrost conditions frequently occur in the European Alps. How soils under such conditions have evolved and how they may react to climate warming is largely unknown. This study focuses on the comparison of nearby soils that are characterised by the presence or absence of permafrost (active‐layer thickness: 2–3 m) in the alpine (tundra) and subalpine (forest) range of the Eastern Swiss Alps using a multi‐method (geochemical and mineralogical) approach. Moreover, a new non‐steady‐state concept was applied to determine rates of chemical weathering, soil erosion, soil formation, soil denudation, and soil production. Long‐term chemical weathering rates, soil formation and erosion rates were assessed by using immobile elements, fine‐earth stocks and meteoric ¹⁰Be. In addition, the weathering index (K + Ca)/Ti, the amount of Fe‐ and Al‐oxyhydroxides and clay minerals characteristics were considered. All methods indicated that the differences between permafrost‐affected and non‐permafrost‐affected soils were small. Furthermore, the soils did not uniformly differ in their weathering behaviour. A tendency towards less intense weathering in soils that were affected by permafrost was noted: at most sites, weathering rates, the proportion of oxyhydroxides and the weathering stage of clay minerals were lower in permafrost soils. In part, erosion rates were higher at the permafrost sites and accounted for 79–97% of the denudation rates. In general, soil formation rates (8.8–86.7 t/km²/yr) were in the expected range for Alpine soils. Independent of permafrost conditions, it seems that the local microenvironment (particularly vegetation and subsequently soil organic matter) has strongly influenced denudation rates. As the climate has varied since the beginning of soil evolution, the conditions for soil formation and weathering were not stable over time. Soil evolution in high Alpine settings is complex owing to, among others, spatio‐temporal variations of permafrost conditions and thus climate. This makes predictions of future behaviour very difficult. Copyright © 2016 John Wiley & Sons, Ltd.  相似文献   

From land to sea: provenance,composition, and preservation of organic matter in a marine sediment record from the North-East Greenland shelf spanning the Younger Dryas–Holocene     

Nanna Andreasen  Rebecca Jackson  Arka Rudra  Henrik Nøhr-Hansen  Hamed Sanei  Jørgen Bojesen-Koefoed  Marit-Solveig Seidenkrantz  Christof Pearce  Nicolas Thibault  Sofia Ribeiro 《Boreas: An International Journal of Quaternary Research》2023,52(4):459-475

The organic matter content of marine sediments is often used to infer past changes in ocean conditions. However, the organic carbon pool preserved in coastal sediments is a complex mixture derived from different sources and may not reflect in situ processes. In this study, we combine taxonomic identification of reworked palynomorphs with pyrolysis organic geochemistry and reflected-light organic petrographic microscopy to investigate the provenance, composition and preservation of organic matter in a marine sediment core retrieved from the NE Greenland shelf. Our study reveals continuous yet variable input of land-derived organic carbon to the marine environment throughout the late Younger Dryas–Holocene, with the highest input of inert carbon in the late Younger Dryas. Although the sediments contain some recent marine palynomorphs, there is no other evidence of fresh marine organic carbon. In contrast, our results indicate that these shelf sediments represent a significant sink of recycled organic carbon. The results of pyrolysis geochemistry revealed that ~90% of the total organic carbon in the sediments is inert. The organic petrography analyses revealed that >70–84% of the organic carbon in the sediment core is terrigenous. Reworked dinoflagellate cysts showed a continuous provenance of Cretaceous land-derived material, most likely from the nearby Clavering Island. Our study points to the importance of constraining the organic matter origin, composition and preservation in marine sediments to achieve more accurate palaeoenvironmental reconstructions based on organic proxies.  相似文献   

Apatite as probe for the halogen composition of metamorphic fluids (Bamble Sector,SE Norway)     

Christof Kusebauch  Timm John  Martin J. Whitehouse  Ane K. Engvik 《Contributions to Mineralogy and Petrology》2015,169(4):1-20

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The impact of the antenna phase center models on the coordinates in the EUREF Permanent Network     

Araszkiewicz  Andrzej  Völksen  Christof 《GPS Solutions》2017,21(2):747-757

GPS Solutions - Precise positioning using the signals of the Global Position System requires correcting the distance between the points of reception of the signal carrier phase and the antenna...  相似文献   

Parameterizability of processes in subsurface energy and mass storage     

Frank Dethlefsen  Christof Beyer  Volker Feeser  Ralf Köber 《Environmental Earth Sciences》2016,75(10):885

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The last glaciation of the Arctic volcanic island Jan Mayen     

Astrid Lyså  Eiliv A. Larsen  Johanna Anjar  Naki Akçar  Morgan Ganerød  Asbjørn Hiksdal  Roelant Van Der Lelij  Christof Vockenhuber 《Boreas: An International Journal of Quaternary Research》2021,50(1):6-28

The volcanic island of Jan Mayen, remotely located in the Norwegian-Greenland Sea, was covered by a contiguous ice cap during the Late Weichselian. Until now, it has been disputed whether parts of the island south of the presently glaciated Mount Beerenberg area were ever glaciated. Based on extensive field mapping we demonstrate that an ice cap covered all land areas and likely also extended onto the shallow shelf areas southeast and east of the island. Chronological interpretations are based on K-Ar and ⁴⁰Ar/³⁹Ar dating of volcanic rocks, cosmogenic nuclide (³⁶Cl) surface exposure dating of bedrock and glacial erratics, and radiocarbon dating. We argue that ice growth started after 34 ka and that an initial deglaciation started some 21.5–19.5 ka in the southern and middle parts of the island. In the northern parts, closer to the present glaciers, the deglaciation might have started later, as evidenced by the establishment of vegetation 17–16 cal. ka BP. During full glaciation, the ice cap was likely thickest over the southern part of the island. This may explain a seemingly delayed deglaciation compared with the northern parts despite earlier initial deglaciation. In a broader context, the new knowledge of the Late Weichselian of the island contributes to the understanding of glaciations surrounding the North Atlantic and its climate history.  相似文献