Groundwater Recharge
Marcel Gaj, Matthias Beyer, Paul Koeniger, Heike Wanke, Josefina Hamutoko & Thomas Himmlesbach (2016): In situ unsaturated zone water stable isotope (2H and 18O) measurements in semi-arid environments: a soil water balance, Hydrol. Earth Syst. Sci., 20, 715-731, doi:10.5194/hess-20-715-2016, 2016.
Matthias Beyer, Marcel Gaj, Josefina Hamutoko, Paul Koeniger, Heike Wanke & Thomas Himmelsbach (2015): Deuterium labeling for the estimation of annual groundwater recharge in semi-arid regions. Isotopes in Environmental and Health Studies. DOI: 10.1080/10256016.2015.1076407.
Josefina T. Hamutoko, Heike Wanke, Paul Koeniger, Matthias Beyer, Marcel Gaj (2017): Hydrogeochemical and isotope study of perched aquifers in the Cuvelai-Etosha Basin, Namibia. Isotopes in Environmental and Health Studies.
Isotope Geochemistry
Marcel Gaj, Stephan Kaufhold, Jeffrey J. McDonnell (2017): Potential limitation of cryogenic vacuum extractions and spiked experiments. Rapid communications in mass spectrometry, 31 (9), 821–823. DOI: 10.1002/rcm.7850.
Marcel Gaj, Stephan Kaufhold, Paul Koeniger, Matthias Beyer, Markus Weiler, Thomas Himmelsbach (2017): Mineral mediated isotope fractionation of soil water. Rapid Communications in Mass Spectrometry, 31(3), 269-280.
Magali F. Nehemy, Cody Millar, Kimberley Janzen, Marcel Gaj, Dyan L. Pratt, Colin P. Laroque, Jeffrey J. McDonnell. (2019). 17O‐excess as a detector for co‐extracted organics in vapor analyses of plant isotope signatures. Rapid Communications in Mass Spectrometry.
Biogeochemical Interfaces
Marcel Gaj, Axel Lamparter, Susanne K. Woche, Jörg Bachmann, Jeffrey J. McDonnell, Florian Stange (2019): The role of matric potential, wettability and surface elemental composition on equilibrium fractionation of soil water. Vadose Zone Journal.
Marcel Gaj, Jeffrey J. McDonnell (2018): Soil tension controls the equilibrium fractionation during evaporation. Hydrological Processes.
Plant root water uptake dynamics
Mathias Beyer, Josefina T. Hamutoko, Heike Wanke, Marcel Gaj, Paul Koeniger (2018). Examination of deep root water uptake using anomalies of soil water stable isotopes, depth-controlled isotopic labeling and mixing models. Journal of hydrology, 566, 122-136.
Guselle, J., MS, Plant transpiration effects on the distribution and movement of soil water: A controlled laboratory experiment. University of Saskatchewan.
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