A5091547501- Groundwater and Isotope Geochemistry
- Methane Hydrates and Related Phenomena
- Groundwater flow and contamination studies
- Geology and Paleoclimatology Research
- Atmospheric and Environmental Gas Dynamics
- Cryospheric studies and observations
- Arctic and Antarctic ice dynamics
- Karst Systems and Hydrogeology
- Isotope Analysis in Ecology
- Hydrology and Watershed Management Studies
- Marine and coastal ecosystems
- Oceanographic and Atmospheric Processes
- Atmospheric Ozone and Climate
- Arsenic contamination and mitigation
- Climate change and permafrost
- Groundwater and Watershed Analysis
- Ionosphere and magnetosphere dynamics
- Radioactive contamination and transfer
- Analytical chemistry methods development
- Water Quality and Pollution Assessment
- Maritime Transport Emissions and Efficiency
- Nuclear Physics and Applications
- Spacecraft and Cryogenic Technologies
- Astro and Planetary Science
- Hydrocarbon exploration and reservoir analysis
University of Bremen
2015-2024
We describe the mass spectrometric facility for measuring helium isotopes, neon, and tritium that has been operative at this institute since 1989, also sampling sample preparation steps precede analysis. For water samples in a near-equilibrium with atmospheric air, achieves precision 3He/4He ratios of±0.4% or better, and±0.8 % better neon concentrations. Tritium is typically±3 detection limit 10 mTU (≈ 1.2·10−3 Bq/kg of pure water). Sample throughputs can reach some thousands per year. These...
Abstract The Filchner‐Ronne Ice Shelf (FRIS) is characterized by moderate basal melt rates due to the near‐freezing waters that dominate wide southern Weddell Sea continental shelf. We revisited region in austral summer 2018 with detailed hydrographic and noble gas surveys along FRIS. FRIS front was High Salinity Water (HSSW) Ronne Depression, (ISW) on its eastern flank, an inflow of modified Warm Deep (mWDW) entering through Central Trough. Filchner Trough dominated HSSW‐sourced ISW, likely...
Abstract Berlin relies on induced bank filtration from a broad‐scale, lake‐type surface water system. Because the contains treated sewage, wastewater residues are present in and groundwater. Multiple environmental tracers, including tritium helium isotopes ( 3 H, He, 4 He), stable (δ 18 O δ 2 H) number of persistent sewage indicators, such as chloride, boron selection pharmaceutical (phenazone‐type analgesics their metabolites, carbamazepine anthropogenic gadolinium, Gd excess ), were used...
Groundwater age is a key aspect of production well vulnerability. Public drinking water supply wells typically have long screens and are expected to produce mixture groundwater ages. The distributions seven the Holten field (Netherlands) were estimated from tritium‐helium ( 3 H/ He), krypton‐85 85 Kr), argon‐39 39 Ar), using new application discrete distribution model existing mathematical models, by minimizing uncertainty‐weighted squared differences modeled measured tracer concentrations....
The present study aims to understand the impact of submarine groundwater discharge (SGD) on a coastal area with different lithology and degrees SGD. Sampling campaigns took place in Puck Bay Gulf Gdańsk, southern Baltic Sea encompassing years between 2009 2021. methodological approach combined geophysical characterization surface sediments detailed spatial temporal (isotope) biogeochemical investigations pore waters, was supported by nearshore river surveys. Acoustic identified areas...
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....
Abstract The Greenland Ice Sheet (GrIS) faces accelerated melting under a warming climate. This also affects the largest marine‐terminating outlet glacier of Northeast Stream (NEGIS), Nioghalvfjerdsbræ (79 North Glacier, 79NG). In cavity below its floating ice tongue, heat inflowing warm and saline Atlantic Water melts at base, colder fresher outflow is exported toward shelf break presumably south with East Current (EGC). However, freshwater from submarine hardly distinguishable other...
Abstract. Groundwater can be a major source of nutrients and contaminants to river systems in agriculturally active areas with significant implications for water quality ecosystem health. The Elbe eastern Germany, characterised by Cretaceous aquifers upstream Quaternary downstream, is located intense agricultural activity therefore vulnerable nutrient fluxes. This study investigates the time scales diffuse groundwater-borne entering using multi-environmental tracers (³H/³He, SF₆, CFCs, ¹⁴C)....
The relationship between the atmospheric concentration of cosmogenic isotopes, change solar activity and hence secondary neutron flux has already been proven. temporal variation most studied isotopes shows a significant anti-correlation with cycles. However, since artificial tritium input to atmosphere due nuclear-weapon tests masked expected variations production rate by three orders magnitude, natural in meteoric precipitation not previously detected. For first time, we provide clear...
Millions of people globally, and particularly in South Southeast Asia, face chronic exposure to arsenic from reducing groundwaters which. Arsenic release is widely attributed largely reductive dissolution arsenic-bearing iron minerals, driven by metal bacteria using bioavailable organic matter as an electron donor. However, the nature implicated mobilization, location within subsurface where these processes occur, remains debated. In a high resolution study pristine, shallow aquifer Kandal...
Abstract Groundwater dynamics in continental rift zone settings remain poorly understood because of the spatial heterogeneity flow, storage, and recharge dynamics. The Central Kenya Rift is an excellent example where, though groundwater important for domestic, irrigation, geothermal energy exploitation, its hydrogeological properties largely unknown. Existing conceptual models assume flow from high‐elevation, humid flanks to low‐elevation, semiarid floor, but role faults that fracture...
The impact of freshwater sources like surface river runoff and submarine groundwater discharge (SGD) on coastal waters is currently in focus intense debate investigation. One the ongoing challenges SGD research characterization quantification endmember contributions to subsurface mixing zone their influences element balance biogeochemical transformations. Long-term investigations sediment porewater composition provide understanding physical, hydrological processes controlling substance...
Nitrate pollution from agricultural activities often persistently affects groundwater quality due to long residence times in the vadose and saturated zone. In this study we used a lumped parameter approach estimate time of nitrate agriculturally Jahna‐Aue drinking water catchment Saxonia, Germany. Inverse modeling measured concentrations tritium tritiogenic 3 He revealed consistent mean between 25 50 years for young, nitrate‐rich component, high contributions (>75%) an old, tracer‐free,...
As methane is consumed in the deep sea, its 13 C/ 12 C ratio progressively increases because of kinetic isotope fractionation. Many submarine hydrothermal vents emit with carbon ratios that are higher than those background surrounding ocean. Since latter exists at low concentrations, mixing vent fluid tends to decrease as concentration decreases, opposite trend produced by consumption. We investigated CH 4 and δ together 3 He plumes from Logatchev field (LHF) located 14°45′N, 45°W, which...
Upwelling velocities w in the equatorial band are too small to be directly observed. Here, we apply a recently proposed indirect method, using observed helium isotope ( 3 He or 4 He) disequilibria mixed layer. The data were sampled from three cruises eastern tropical Atlantic September 2005 and June/July 2006. A one‐dimensional two‐box model was applied, where air‐sea gas exchange is balanced by upwelling He‐rich water below layer vertical mixing. mixing coefficients K v estimated...
Large‐scale dispersion was studied in an unconsolidated, sandy, glaciofluvial, river‐recharged, and confined aquifer Germany. Groundwater observation wells from a 3.5‐km‐long transect located flow direction the river Oder into large lowland area (Oderbruch polder) were sampled for noble gases order to date groundwater with tritium helium ( 3 H‐ He) technique. The apparent He ages of increased only few months >40 years along path. Highest values initial H (sum its decay product tritiogenic...