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Anzeige der Dokumente 391-410 von 6897
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Assessing the utility of trace and rare earth elements as biosignatures in microbial iron oxyhydroxides
(Frontiers in Earth Science, 2015)Microbial iron oxyhydroxides are common deposits in natural waters, recent sediments, and mine drainage systems. Along with these minerals, trace and rare earth elements (TREE) are being accumulated within the mineralizing ... -
Assessing vertical diffusion in a stratified lake using a three-dimensional hydrodynamic model
(Hydrological Processes, 2019)Vertical turbulent diffusivity (Kz), which can be estimated from water temperature, is a key factor in the evolution of water quality in lentic waters. In this study, we analysed the capability of a three-dimensional ... -
Assessing Volcanic Controls on Miocene Climate Change
(Geophysical Research Letters, 2022-01-18)The Miocene period saw substantially warmer Earth surface temperatures than today, particularly during a period of global warming called the Mid Miocene Climatic Optimum (MMCO; ∼17–15 Ma). However, the long‐term drivers ... -
Assessment and abatement of the eco-risk caused by mine spoils in the dry subtropical climate
(Environmental Geochemistry and Health, 2021-04-09)The highly rugged mountainous land topography of the Novorossiysk industrial agglomeration (NW Caucasus, Krasnodar Krai, Russia) and arid climate limit the restoration abilities of disturbed mine lands. Abandoned waste-rock ... -
Assessment of C, N, and Si Isotopes as Tracers of Past Ocean Nutrient and Carbon Cycling
(Global Biogeochemical Cycles, 2021-07-02)Biological productivity in the ocean directly influences the partitioning of carbon between the atmosphere and ocean interior. Through this carbon cycle feedback, changing ocean productivity has long been hypothesized as ... -
Assessment of crop risk due to climate change in Sao Tome and Principe
(Regional Environmental Change, 2021-02-11)Sao Tome and Principe is a small insular country in the west coast of Central Africa. The small dimensions of the islands and the limited natural resources put these islands under highly vulnerable to climate change. To ... -
Assessment of the heterogeneity of hydraulic properties in gravelly outwash plains: a regionally scaled sedimentological analysis in the Munich gravel plain, Germany
(Hydrogeology Journal, 2020-08-11)The favorable overall conditions for the utilization of groundwater in fluvioglacial aquifers are impacted by significant heterogeneity in the hydraulic conductivity, which is related to small-scale facies changes. Knowledge ... -
Assessment of the Precision of Spectral Model Turbulence Analysis Techniques Using Direct Numerical Simulation Data
(Journal of Geophysical Research: Atmospheres, 2022-02-17)The spectral model turbulence analysis technique is widely used to derive kinetic energy dissipation rates of turbulent structures (ɛ) from different in situ measurements in the Earth's atmosphere. The essence of this ... -
Assessment of water contamination by potentially toxic elements in mangrove lagoons of the Red Sea, Saudi Arabia
(Environmental Geochemistry and Health, 2021-05-26)Mangrove (Avicennia marina) forests in the Red Sea cost have great concern from environmental, biological, economic, and social points of view. Therefore, assessing water contamination in this ecosystem is worth to be ... -
Assimilating synthetic land surface temperature in a coupled land–atmosphere model
(Quarterly Journal of the Royal Meteorological Society, 2020)A realistic simulation of the atmospheric boundary layer (ABL) depends on an accurate representation of the land–atmosphere coupling. Land surface temperature (LST) plays an important role in this context and the assimilation ... -
Assimilating visible satellite images for convective-scale numerical weather prediction: A case-study
(Quarterly Journal of the Royal Meteorological Society, 2020)Satellite images in the visible spectral range contain high-resolution cloud information, but have not been assimilated directly before. This paper presents a case-study on the assimilation of visible Meteosat SEVIRI images ... -
Assimilation of High-Resolution Soil Moisture Data Into an Integrated Terrestrial Model for a Small-Scale Head-Water Catchment
(Water Resources Research, 2019)Land surface-subsurface modeling combined with data assimilation was applied on the Rollesbroich hillslope (Germany). Dense information from a soil moisture sensor network was assimilated with the ensemble Kalman filter ... -
Association of S-type and I-type granitoids in the Neoproterozoic Cameroon orogenic belt, Bafoussam area, West Cameroon - geology, geochemistry and petrogenesis
(Univ. Würzburg, 2005)Die Region Bafoussam im westlichen Kamerun ist Teil des "Cameroon Neoproterozoic orogenic belt" (nördlich des Kongo Kratons), welcher zum "Central African Fold Belt" (CAFB)gehört. Die Entstehung des CAFB hängt ... -
Asteroid 2008 TC3, not a polymict ureilitic but a polymict C1 chondrite parent body? Survey of 249 Almahata Sitta fragments
(Meteoritics & Planetary Science, 2022-05-14)On October 7, 2008, the asteroid 2008 TC3 exploded as it entered the Earth’s atmosphere, producing significant dust (in the atmosphere) and delivering thousands of stones in a strewn field in Sudan, collectively known as ... -
Astrophysical phenomena related to supermassive black holes - searching for local particularities in the center of the Milky Way and extragalactic nuclei at high angular resolution
(Univ. Köln, 2006)All projects aim at pushing the limits of our knowledge about the interaction between a galaxy and a supermassive black hole (SMBH) at its center. The development of a new instrument can be as valuable as combining different ... -
Asymmetrical deformation of the Piton de la Fournaise (Réunion Island) summit cone
(11. Symposium "Tektonik, Struktur- und Kristallingeologie", 2006-03)Piton de la Fournaise (Réunion Island) is an active basaltic shield volcano in the south-western part of the Indian Ocean. The activity consists essentially of lava being issued from two rift zones close to the summit cone. ... -
Atmospheric and Oceanographic Signatures in the Ice Shelf Channel Morphology of Roi Baudouin Ice Shelf, East Antarctica, Inferred From Radar Data
(Journal of Geophysical Research: Earth Surface, 2020-07-09)Ice shelves around Antarctica can provide back stress for outlet glaciers and control ice sheet mass loss. They often contain narrow bands of thin ice termed ice shelf channels. Ice shelf channel morphology can be interpreted ... -
Atmospheric circulation patterns that trigger heavy rainfall in West Africa
(International Journal of Climatology, 2022-04-07)Classification of atmospheric circulation patterns (CP) is a common tool for downscaling rainfall, but it is rarely used for West Africa. In this study, a two‐step classification procedure is proposed for this region, which ... -
Atmospheric CO2 Concentration Based on Boron Isotopes Versus Simulations of the Global Carbon Cycle During the Plio‐Pleistocene
(Paleoceanography and Paleoclimatology, 2023-02-21)Atmospheric carbon dioxide concentrations (pCO2) beyond ice core records have been reconstructed from δ11B derived from planktic foraminifera found in equatorial sediment cores. Here, I applied a ... -
Atmospheric CO2 fertilization effects on biomass yields of 10 crops in northern Germany
(Frontiers in Environmental Science, 2015)The quality and quantity of the influence that atmospheric CO2 has on crop growth is still a matter of debate. This study's aim is to estimate if [CO2] will have an effect on biomass yields at all, to quantify and spatially ...