Isotope; Emanation; Stable Isotope; Cosmogenic production; Dating; Underground production; Low level counting; Tracing environmental processes; Climate reconstruction; Hydrology; Atmosphere
Zappala J. C., Baggenstos D., Gerber C., Jiang W., Kennedy B. M., Lu Z. T., Masarik J., Mueller P., Purtschert R., Visser A. (2020), Atmospheric 81Kr as an integrator of cosmic-ray flux on the hundred-thousand-year timescale, in
Geophysical Research Letters, n/a, 2019-086381.
Jakobsen Rasmus, Hinsby Klaus, Aamand Jens, van der Keur Peter, Kidmose Jacob, Purtschert Roland, Jurgens Bryant, Sültenfuss Jürgen, Albers Christian N. (2020), History and Sources of Co-Occurring Pesticides in an Abstraction Well Unraveled by Age Distributions of Depth-Specific Groundwater Samples, in
Environmental Science & Technology, 54, 158-165.
Holmes Jonathan A, Leuenberger Markus, Molloy Karen, O'Connell Michael (2019), Younger Dryas and Holocene environmental change at the Atlantic fringe of Europe derived from lake‐sediment stable‐isotope records from western Ireland, in
Boreas, 1-15.
Shestakova Tatiana A, Voltas Jordi, Saurer Matthias, Berninger Frank, Esper Jan, Andreu‐Hayles Laia, Daux Valérie, Helle Gerhard, Leuenberger Markus, Loader Neil J (2019), Spatio‐temporal patterns of tree growth as related to carbon isotope fractionation in European forests under changing climate, in
Global Ecology and Biogeography, 28, 1295-1309.
Affolter Stéphane, Häuselmann Anamaria, Fleitmann Dominik, Edwards R Lawrence, Cheng Hai, Leuenberger Markus (2019), Central Europe temperature constrained by speleothem fluid inclusion water isotopes over the past 14,000 years, in
Science advances, 5, 3809-3809.
Bréant Camille, Landais Amaelle, Orsi Anais, Martinerie Patricia, Extier Thomas, Prié Frédéric, Stenni Barbara, Jouzel Jean, Masson-Delmotte Valérie, Leuenberger Markus (2019), Unveiling the anatomy of Termination 3 using water and air isotopes in the Dome C ice core, East Antarctica, in
Quaternary Science Reviews, 211, 156-165.
Cormier M-A, Werner Roland A, Leuenberger Markus C, Kahmen Ansgar (2019), 2 H-enrichment of cellulose and n-alkanes in heterotrophic plants, in
Oecologia, 189, 365-373.
Heidinger Michael, Eichinger Florian, Purtschert Roland, Mueller Peter, Zappala Jake, Wirsing Gunther, Geyer Tobias, Fritzer Thomas, Groß Doris (2019), Altersbestimmung an thermalen Tiefenwässern im Oberjura des Molassebeckens mittels Krypton-Isotopen, in
Grundwasser, 24, 287-294.
Bollhöfer Andreas, Schlosser Clemens, Schmid Sabine, Konrad Martina, Purtschert Roland, Krais Roman (2019), Half a century of Krypton-85 activity concentration measured in air over Central Europe: Trends and relevance for dating young groundwater, in
Journal of Environmental Radioactivity, 205-206, 7-16.
Kastlander J., Aldener M., Fritioff T., Raghoo L., Purtschert R. (2019), Measurement of radioxenon and radioargon in air from soil with elevated uranium concentration, in
Journal of Environmental Radioactivity, 197, 62-66.
Yokochi Reika, Ram Roi, Zappala Jake C., Jiang Wei, Adar Eilon, Bernier Ryan, Burg Avihu, Dayan Uri, Lu Zheng-Tian, Mueller Peter, Purtschert Roland, Yechieli Yoseph (2019), Radiokrypton unveils dual moisture sources of a deep desert aquifer, in
Proceedings of the National Academy of Sciences, 116, 16222-16222.
Yechieli Yoseph, Yokochi Reika, Zilberbrand Michael, Lu Zheng-Tian, Purtschert Roland, Sueltenfuss Jürgen, Jiang Wei, Zappala Jake, Mueller Peter, Bernier Ryan, Avrahamov Naama, Adar Eilon, Talhami Firas, Livshitz Yakov, Burg Avihu (2019), Recent seawater intrusion into deep aquifer determined by the radioactive noble-gas isotopes 81Kr and 39Ar, in
Earth and Planetary Science Letters, 507, 21-29.
Döring Michael, Leuenberger Markus (2018), Novel automated inversion algorithm for temperature reconstruction using gas isotopes from ice cores, in
Climate of the Past, 14, 763-788.
Pärn Joonas, Affolter Stéphane, Ivask Jüri, Johnson Sean, Kirsimäe Kalle, Leuenberger Markus, Martma Tõnu, Raidla Valle, Schloemer Stefan, Sepp Holar (2018), Redox zonation and organic matter oxidation in palaeogroundwater of glacial origin from the Baltic Artesian Basin, in
Chemical geology, 488, 149-161.
Leuenberger Markus, Levin Ingeborg, Hammer Samuel (2018),
Long-term observations of 14CO2 at Jungfraujoch, 60, 1285-1299, HFSJG, Bern 60, 1285-1299.
Extier Thomas, Landais Amaelle, Bréant Camille, Prié Frédéric, Bazin Lucie, Dreyfus Gabrielle, Roche Didier M, Leuenberger Markus (2018), On the use of δ18Oatm for ice core dating, in
Quaternary Science Reviews, 185, 244-257.
Yuan Ye, Ries Ludwig, Petermeier Hannes, Steinbacher Martin, Gómez-Peláez Angel J, Leuenberger Markus C, Schumacher Marcus, Trickl Thomas, Couret Cedric, Meinhardt Frank (2018), Adaptive selection of diurnal minimum variation: a statistical strategy to obtain representative atmospheric CO 2 data and its application to European elevated mountain stations, in
Atmospheric Measurement Techniques, 11, 1501-1514.
Kobashi Takuro, Menviel Laurie, Jeltsch-Thömmes Aurich, Vinther Bo M, Box Jason E, Muscheler Raimund, Nakaegawa Toshiyuki, Pfister Patrik L, Döring Michael, Leuenberger Markus (2018), Author Correction: Volcanic influence on centennial to millennial Holocene Greenland temperature change, in
Scientific reports, 8, 1-1.
Ziehmer Malin Michelle, Nicolussi Kurt, Schlüchter Christian, Leuenberger Markus (2018), Preliminary evaluation of the potential of tree-ring cellulose content as a novel supplementary proxy in dendroclimatology, in
Biogeosciences, 15, 1047-1064.
Cormier Marc‐André, Werner Roland A, Sauer Peter E, Gröcke Darren R, Leuenberger Markus C, Wieloch Thomas, Schleucher Jürgen, Kahmen Ansgar (2018), 2H‐fractionations during the biosynthesis of carbohydrates and lipids imprint a metabolic signal on the δ2H values of plant organic compounds, in
New Phytologist, 218, 479-491.
Avrahamov Naama, Yechieli Yoseph, Purtschert Roland, Levy Yehuda, Sültenfuß Jürgen, Vergnaud Virginie, Burg Avihu (2018), Characterization of a carbonate karstic aquifer flow system using multiple radioactive noble gases (3H-3He, 85Kr, 39Ar) and 14C as environmental tracers, in
Geochimica et Cosmochimica Acta, 242, 213-232.
McCallum James L., Cook Peter G., Dogramaci Shawan, Purtschert Roland, Simmons Craig T., Burk Lawrence (2018), Identifying modern and historic recharge events from tracer-derived groundwater age distributions, in
Water Resources Research, 100-115.
Tessler M., Paul M., Halfon S., Meyer B. S, Pardo R., Purtschert R., Rehm K. E, Scott R., Weigand M., Weissman L., Almaraz-Calderon S., Avila M. L, Baggenstos D., Collon P., Hazenshprung N., Kashiv Y., Kijel D., Kreisel A., Reifarth R., Santiago-Gonzalez D., Shor A., Silverman I., Talwar R., Veltum D., Vondrasek R. (2018), Stellar $^{36,38}\mathrm{Ar}(n,\ensuremath{\gamma})^{37,39}\mathrm{Ar}$ Reactions and Their Effect on Light Neutron-Rich Nuclide Synthesis, in
Physical Review Letters, 121, 112701-112701.
McCallum James L., Dogramaci Shawan, Cook Peter G., Banks Eddie, Purtschert Roland, Irvine Michelle, Simmons Craig T., Burk Lawrence (2018), Stochastic correction of carbon-14 activities: A Bayesian approach with argon-39 validation, in
Journal of Hydrology, 566, 396-405.
Gerber Christoph, Purtschert Roland, Hunkeler Daniel, Hug Rainer, Sültenfuss Jürgen (2018), Using environmental tracers to determine the relative importance of travel times in the unsaturated and saturated zones for the delay of nitrate reduction measures, in
Journal of Hydrology, 561, 250-266.
Berhanu Tesfaye, Szidat Sönke, Brunner Dominik, Satar Ece, Schanda Rüdiger, Nyfeler Peter, Battaglia Michael, Steinbacher Martin, Hammer Samuel, Leuenberger Markus (2017), Estimation of the fossil fuel component in atmospheric CO₂ based on radiocarbon measurements at the Beromünster tall tower, Switzerland, in
Atmospheric chemistry and physics, 17, 10753-10766.
Hatvani István Gábor, Leuenberger Markus, Kohán Balázs, Kern Zoltán (2017), Geostatistical analysis and isoscape of ice core derived water stable isotope records in an Antarctic macro region, in
Polar science, 13, 23-32.
Oney Brian, Gruber Nicolas, Henne Stephan, Leuenberger Markus, Brunner Dominik (2017), A CO-based method to determine the regional biospheric signal in atmospheric CO2, in
Tellus B: Chemical and Physical Meteorology, 69, 1353388-1353388.
Andreu-Hayles Laia, Ummenhofer Caroline C, Barriendos Mariano, Schleser Gerhard H, Helle Gerhard, Leuenberger Markus, Gutierrez Emilia, Cook Edward R (2017), 400 Years of summer hydroclimate from stable isotopes in Iberian trees, in
Climate Dynamics, 49, 143-161.
Schilder Jos, van Hardenbroek Maarten, Bodelier Paul, Kirilova Emiliya P, Leuenberger Markus, Lotter André F, Heiri Oliver (2017), Trophic state changes can affect the importance of methane-derived carbon in aquatic food webs, in
Proceedings of the Royal Society B: Biological Sciences, 284, 20170278-20170278.
Keller Kathrin, Lienert Sebastian, Bozbiyik Anil, Stocker Thomas, Frank David C, Klesse Stefan, Koven Charles D, Leuenberger Markus, Riley William J, Saurer Matthias (2017), 20th century changes in carbon isotopes and water-use efficiency: tree-ring-based evaluation of the CLM4. 5 and LPX-Bern models, in
Biogeosciences, 14, 2641-2673.
Gerber Christoph, Vaikmäe Rein, Aeschbach Werner, Babre Alise, Jiang Wei, Leuenberger Markus, Lu Zheng-Tian, Mokrik Robert, Müller Peter, Raidla Valle (2017), Using 81Kr and noble gases to characterize and date groundwater and brines in the Baltic Artesian Basin on the one-million-year timescale, in
Geochimica et Cosmochimica Acta, 205, 187-210.
Kobashi Takuro, Menviel Laurie, Jeltsch-Thömmes Aurich, Vinther Bo M, Box Jason E, Muscheler Raimund, Nakaegawa Toshiyuki, Pfister Patrik L, Döring Michael, Leuenberger Markus (2017), Volcanic influence on centennial to millennial Holocene Greenland temperature change, in
Scientific reports, 7, 1-10.
Bamberger Ines, Oney Brian, Brunner Dominik, Henne Stephan, Leuenberger Markus, Buchmann Nina, Eugster Werner (2017), Observations of atmospheric methane and carbon dioxide mixing ratios: tall-tower or mountain-top stations?, in
Boundary-Layer Meteorology, 164, 135-159.
Schilling Oliver S., Gerber Christoph, Partington Daniel J., Purtschert Roland, Brennwald Matthias S., Kipfer Rolf, Hunkeler Daniel, Brunner Philip (2017), Advancing Physically-Based Flow Simulations of Alluvial Systems Through Atmospheric Noble Gases and the Novel 37Ar Tracer Method, in
Water Resources Research, 53, 10465-10490.
Yokochi Reika, Bernier Ryan, Purtschert Roland, Zappala Jake C., Yechieli Yoseph, Adar Eilon, Jiang Wei, Lu Zheng-Tian, Mueller Peter, Olack Gerard, Ram Roi (2017), Field Degassing as a New Sampling Method for 14C Analyses in Old Groundwater, in
Radiocarbon, 60, 349-366.
Zappala J. C., Bailey K., Mueller P., O'Connor T. P., Purtschert R. (2017), Rapid processing of 85Kr/Kr ratios using Atom Trap Trace Analysis, in
Water Resources Research, 53, 2553-2558.
Zappala J. C., Bailey K., Jiang W., Micklich B., Mueller P., O’Connor T. P., Purtschert R. (2017), Setting a limit on anthropogenic sources of atmospheric 81Kr through Atom Trap Trace Analysis, in
Chemical Geology, 453, 66-71.
Esper Jan, Carnelli Adriana L, Kamenik Christian, Filot Marc, Leuenberger Markus, Treydte Kerstin (2017), Spruce tree-ring proxy signals during cold and warm periods, in
Dendrobiology, 77, 3-18.
Isotope studies have considerably increased over the last decades mainly due to the development of online preparation systems and new detector methods such as laser based instruments. Yet, for many applications mass spectrometric isotope ratio measurements are still state-of-the-art. Recent analytical developments in our groups allow a more detailed quantification of past temperature variations based on climate proxies and characterization of biogeochemical cycles. The goal of the project isotopes in Earth System Science (isoCEP) is to extend these new analytical tools and to apply them to four paleo archives, namely ice cores, tree rings, ground water and speleothems as well as to direct atmospheric air samples in order to enhance the process understanding of the Earth’s Climate System. This includes (i) quantification of temperature variations based on air nitrogen and argon isotopes (d15N and d40Ar) extracted from polar ice focussing on the Holocene period; (ii) quantification of water stable isotopes (d17O, d18O, d17O, dD) of speleothem fluid inclusions and build-up of an expertise of clumped isotope applications related to the above mentioned archives and on biogeochemical processes, i.e. photosynthesis/respiration, fossil fuel oxidation etc.; (iii) measurements of triple isotopes (d13C, d18O and dD) to complete the Holocene records of tree ring finds from forelands of retreating alpine glaciers; (iv) quantification of direct atmospheric air composition and (v) quantification of subsurface production rates of argon isotopes in order to enhance the robustness of argon isotope interpretations related to groundwater dating and reconstructions of recharge conditions in the past. We will address two main objectives by investigations of these five different research topics. First, we aim to improve the robustness of Holocene temperature reconstructions and to better understand their spatial differences and gradients. Therefore, we will perform measurements from four paleo archives polar ice cores, groundwater aquifers, mid-latitude tree rings and low-mid latitude speleothems that exhibit the necessary spatial and vertical coverage. Second, since the understanding of biogeochemical processes is the key to correctly read and interpret past variations of climate proxy data, we will deepen this understanding by process specific experiments including clumped besides conventional isotope ratio measurements complemented by gas concentration analyses. This also includes linking past variations with present-day measurements and comparisons with in-house model results. These five different research topics and associated data streams allow us to capture - though still incompletely - the complexity of the Earth’s Climate Systems. In collaboration with our partners and colleagues from the Climate and Environmental Physics Division and with regard to their proposed work submitted in parallel to this proposal, we optimize the outcome from both, the experimental and model, perspectives.