A5038370519- Groundwater and Isotope Geochemistry
- Hydrology and Watershed Management Studies
- Groundwater flow and contamination studies
- Geology and Paleoclimatology Research
- Groundwater and Watershed Analysis
- Isotope Analysis in Ecology
- Plant Water Relations and Carbon Dynamics
- Soil and Unsaturated Flow
- Geological and Tectonic Studies in Latin America
- Cryospheric studies and observations
- Geophysical and Geoelectrical Methods
- Geophysics and Gravity Measurements
- Hydrocarbon exploration and reservoir analysis
- Atmospheric and Environmental Gas Dynamics
- Water Resource Management and Quality
- Methane Hydrates and Related Phenomena
- Marine and environmental studies
- Soil Moisture and Remote Sensing
- Karst Systems and Hydrogeology
- Climate variability and models
- Marine Bivalve and Aquaculture Studies
- Soil and Water Nutrient Dynamics
- Marine and coastal plant biology
- Geophysical Methods and Applications
- Nuclear Physics and Applications
Federal Institute for Geosciences and Natural Resources
2016-2025
Landesamt für Bergbau, Energie und Geologie
2019
South African Weather Service
2018
Leibniz Institute for Applied Geophysics
2009-2012
Leibniz Association
2008-2009
University of Idaho
2006-2007
University of Freiburg
2004-2006
Institute of Hydrology of the Slovak Academy of Sciences
2006
The stable isotopes of water (hydrogen and oxygen isotopes) are utmost interest in ecology the geosciences. In many cases has to be extracted directly from a matrix such as soil or plant tissue before can analyzed by mass spectrometry. Currently, most widely used technique for is cryogenic vacuum extraction. We present simple inexpensive modification this method document tests conducted with soils various grain size tree core replicates taken on four occasions during 2010. accuracies sandy...
Abstract. For more than two decades, research groups in hydrology, ecology, soil science, and biogeochemistry have performed cryogenic water extractions (CWEs) for the analysis of δ2H δ18O water. Recent studies shown that extraction conditions (time, temperature, vacuum) along with physicochemical properties may affect extracted isotope composition. Here we present results from first worldwide round robin laboratory intercomparison. We test null hypothesis that, identical soils, standards,...
Groundwater recharge estimations are necessary for sustainable management of groundwater resources. Among various hydraulic, hydrogeological and hydrological approaches, tracer methods proposed to improve estimations. Soil water isotope-based estimates rates were developed in the 1960s have been applied more than 40 studies reviewed within this manuscript. This comprehensive review research distinguishes three fundamental approaches: (1) labelling method with tritium or deuterium, which can...
Abstract. Stable isotopes (deuterium, 2H, and oxygen-18, 18O) of soil water were measured in the field using a liquid isotope analyzer (tunable off-axis integrated cavity output spectroscope, OA-ICOS, LGR) commercially available gas probes (BGL-30, UMS, Munich) semi-arid Cuvelai–Etosha Basin (CEB), Namibia. Results support applicability an situ measurement system for determination stable pore water. High spatial temporal resolution was achieved study area with reasonable accuracy...
Rationale The ability to recover the isotopic signature of water added soil samples that have previously been oven‐dried decreases with increasing presence silt and clay. effects on associated physicochemical properties are not yet fully understood, for either hydration or dehydration samples. Methods sample chemistry crystallinity minerals were measured by X‐ray fluorescence diffraction. organic carbon cation‐exchange capacity also determined. Water known was used spike an substrate...
Abstract The spatial variation of soil water isotopes (SWI)—representing the baseline for investigating root uptake (RWU) depths with stable isotope techniques—has rarely been investigated. Here, we use SWI depth profile sampling in combination unmanned aerial vehicle (UAV) based land surface temperature estimates and vegetation indices (VI) order to improving process understanding relationships between variability content patterns canopy status, represented form VI. We carried out a 10...
This study investigated the influence of meteorological, pedospheric and physiological factors on water relations Scots pine, as characterized by origin taken up, xylem transport well carbon isotope discrimination (Delta13C) oxygen enrichment (Delta18O) newly assimilated organic matter. For more than 1 year, we quantified delta2H delta18O potential sources Delta13C Delta18O in twig trunk phloem matter biweekly, related these values to continuously measured or modelled meteorological...
Abstract The age stratification of a freshwater lens on the island Langeoog, Germany, was reconstructed through depth‐specific sampling and groundwater dating using tritium‐helium method. is strongly affected by land use resulting differences in recharge rates. Infiltration at dune tops significantly lower than valleys, due to repellency dry sand. Dune valleys contribute up four times more per area other areas. Housing development areas might therefore decrease available fresh groundwater....
Landuse and climate change alter hydrological processes affect drinking water resources. Practical tools for understanding quantifying these becomes increasingly important, example to sustainably manage groundwater reservoirs. Analyses of the isotopes deuterium (δ2H), oxygen (δ18O), tritium (3H) provide useful tools, which can be applied determine ages, assess bank filtration quantities, identify mixings aquifers or long-term climate-induced changes. The objective...
Abstract Isotopic composition of snow cover and streamflow was determined in a snow‐dominated, forested watershed to quantify the spatial variability processes that alter stable isotope (oxygen‐18, 18 O deuterium, 2 H) under different forest canopy conditions (clear‐cut, partial‐cut (thinned), unimpacted forest). Snow sampling carried out on 4 days late winter early spring 2006. Meteorological data, precipitation, were continuously monitored during study. Isotope analyses precipitation...
Abstract Rapid urbanization has exerted considerable pressure on groundwater resources in Jaipur, India. Peri-urban areas are particularly affected as the public supply infrastructure often does not reach this fast-growing fringe, which lacks a planning strategy, leading to an informal water based groundwater. At same time, hills and historic reservoirs located these important for recharge and, therefore, critical sustainable groundwater-resource management. To understand local hydrogeology...
River water samples were analysed for stable isotopes (deuterium and oxygen-18) collected from 46 sites during spring 2008, monthly at the outlets of seven sub-basins Weser (46,200 km2 basin area in total) over a five year period 2003 to 2007, characterise temporal spatial isotope patterns river water. Results indicate pronounced elevation effect (0.2‰ 1 2‰ per 100 m δ18O δ2H, respectively) as well influence seawater mixing few coastal locations. A lumped parameter modelling approach was...
Global precipitation isoscapes based on the Network for Isotopes in Precipitation (GNIP) network are an important toolset that aid our understanding of global hydrologic cycles. Although GNIP database is instrumental developing isoscapes, data coverage some regions hydrological interest (e.g., drylands) low or non-existent thus accuracy and relevance to these debatable. Capitalizing existing literature isotope data, we generated rainfall Namibia (dryland) using cokriging method compared it a...
In Germany, river monitoring for tritium started in the early 1970s. Today this network consists of 50 stations and includes stable isotopes. The isotope time series to end 2021 are at least four years some up 30 long. Daily water samples were collected during an extraordinary dry season from October 2018 until January 2019 six selected Rhine five Elbe basin. most dominating effects seasonal altitude effects, but also a continental effect is visible. isotopes indicate snow ice melt...
Stable isotopes (deuterium and oxygen-18) of precipitation four springs the Figeh spring system were studied between March 2011 July 2012 in karstic Anti-Lebanon Mountains Western Syria. Almost two thirds drinking-water supply Damascus City, capital Syria, is being exploited from system. About 70 samples collected precipitation, 1000 at least weekly time resolution. Observed mean values for agree well with published data earlier studies are −8.7‰ −7.3‰ δ18O −50‰ −40‰ δ2H. Time series...
Abstract The creation of artificial dunes for coastal protection may have important consequences freshwater lenses in aquifers. objective this study was to compare the recharge processes below such a young dune with scant vegetation an older covered by grass and herbaceous vegetation. To aim, soil water samples were collected from unsaturated zone at two sites on Langeoog Island northern Germany, analysed stable isotopes chloride. Recharge rates calculated using new version HYDRUS-1D, which...
The stable water isotope deuterium (2H) was applied as an artificial tracer (2H2O) in order to estimate groundwater recharge through the unsaturated zone and describe soil movement a semi-arid region of northern central Namibia. A particular focus this study assess spatiotemporal persistence when field on small scale under extreme climatic conditions propose method obtain estimates data-scarce regions. At two natural sites that differ vegetation cover, geology, 500 ml 70 % 2H2O solution...
Karst springs of the Zagros Mountains contribute a significant amount to agricultural and human water demands western south-western Iran. For an adequate management available resources in semi-arid arid regions, sufficient hydrological monitoring is needed, hydro-chemical isotope data provide important additional information. About 350 samples were collected from precipitation, river water, karst upper part Karkheh River Basin (20,895 km2) located between 33°35′ 34°55′ North 46°22′ 49°10′...
This study addresses the relevance of preferential flow for transport a non-sorbing solute in sandy agricultural field with nitrate-contaminated groundwater. Two multitracer irrigation experiments were conducted 1) October 2017, and 2) March 2018 on 2 m × plot an Northern Germany (Cloppenburg region). For 1, Cl-, H218O, 15NO3- used as tracers, 2, Br-, 2H2O, tracers. Between both events was subject to natural precipitation. The instrumented soil moisture sensors suction plates. occurrence...
Abstract Stable isotopes of water are known to provide information on mean altitudes spring recharge areas, which is an important parameter for groundwater resources management especially in karstic environments. Very often, a lack precipitation input data limits the possibility appropriate estimation catchment altitudes. In Jeita catchment, Lebanon, characterization was possible with samples collected at six stations varying (88 amount‐weighted monthly samples). A local meteoric line...