A5064861795- Radioactive contamination and transfer
- Methane Hydrates and Related Phenomena
- Radioactivity and Radon Measurements
- Arctic and Antarctic ice dynamics
- Geology and Paleoclimatology Research
- Nuclear and radioactivity studies
- Atmospheric and Environmental Gas Dynamics
- Isotope Analysis in Ecology
- Marine and coastal ecosystems
- Nuclear Physics and Applications
- Radioactive element chemistry and processing
- Groundwater and Isotope Geochemistry
- Oceanographic and Atmospheric Processes
- Ancient Mediterranean Archaeology and History
- Radiation Dose and Imaging
- Historical and Archaeological Studies
- Cryospheric studies and observations
- Ancient and Medieval Archaeology Studies
- Marine and environmental studies
- Ocean Acidification Effects and Responses
- Classical Antiquity Studies
- Maritime and Coastal Archaeology
- Graphite, nuclear technology, radiation studies
- Climate change and permafrost
- Linguistics and language evolution
ETH Zurich
2015-2024
Universitat Rovira i Virgili
2021
Board of the Swiss Federal Institutes of Technology
2018
University of Southampton
2018
Universitat Autònoma de Barcelona
2009-2013
Korea Atomic Energy Research Institute
2013
The GEOTRACES Intermediate Data Product 2017 (IDP2017) is the second publicly available data product of international programme, and contains measured quality controlled before end 2016. IDP2017 includes from Atlantic, Pacific, Arctic, Southern Indian oceans, with about twice volume previous IDP2014. For first time, for a large suite biogeochemical parameters as well aerosol rain characterising atmospheric trace element isotope (TEI) sources. TEI in are by careful assessment intercalibration...
The years following the Fukushima Dai-ichi nuclear power plant (FDNPP) accident, distribution of (90)Sr in seawater coast off Japan has received limited attention. However, is a major contaminant waters accumulated within facility and storage tanks. Seawater samples collected FDNPP September 2013 showed radioactive levels significantly higher than pre-Fukushima 6 km FDNPP. These samples, with up to 8.9 ± 0.4 Bq·m(-3) for (90)Sr, 124 3 (137)Cs, 54 1 (134)Cs, appear be influenced by ongoing...
Abstract. The impact of the earthquake and tsunami on east coast Japan 11 March 2011 caused a loss power at Fukushima Dai-ichi nuclear plant (NPP) that resulted in one most important releases artificial radioactivity into environment. Although several works were devoted to evaluating atmospheric dispersion radionuclides, discharges ocean has been less investigated. Here we evaluate distribution Fukushima-derived 90Sr (n = 57) 89Sr 19) throughout waters 30–600 km offshore June 2011....
Abstract Climate change interacts with the sources and cycling of contaminants, such as radionuclides, in environment. In this review, we discuss implications climate impacts on existing potential future radionuclides associated human activities to marine The overall effect operational releases from nuclear non-nuclear sectors will likely be increased interference or prevention normal operations due weather-related events. For certain radioactive waste dumped at sea sunken submarines, impact...
Abstract This study presents the data on 129 I and 236 U concentrations in seawater samples sea ice cores obtained during two expeditions to Arctic Ocean that took place onboard R/V Polarstern (PS94) Lance (N‐ICE2015) summer 2015. Carbon‐14 was also measured deep water from Nansen, Amundsen, Makarov Basins. The main goal investigate distribution of a transect Norwegian Coast Basin fully exploit potential combining as dual tracer track Atlantic waters throughout Ocean. use I/ U/ 238 atom...
Abstract A reconstruction of historical discharges 236 U into the Northeast Atlantic Ocean by nuclear installations is presented. The reprocessing facilities Sellafield (SF), Great Britain (GB) and La Hague (LH), France potentially also fuel processing installation Springfields (SP), GB represent main contributors in Ocean. Because data on releases lacking, from SP SF are estimated based U‐isotopic systematics found LH. resulting indicates that, until 2013, a total (95 ± 32) kg was...
Abstract The first full transarctic section of 228 Ra in surface waters measured during GEOTRACES cruises PS94 and HLY1502 (2015) shows a consistent distribution with maximum activities the transpolar drift. Activities central Arctic have increased from 2007 through 2011 to 2015. input is attributed stronger wave action on shelves resulting longer ice‐free season. A concomitant decrease Th/ ratio likely results more rapid transit depleted Th by scavenging over shelf. observed intermediate...
Marine biogenic materials such as corals, shells, or seaweed have long been recognized recorders of environmental conditions. Here, the bivalve Cerastoderma edule is used for first time a recorder past seawater contamination with anthropogenic uranium, specifically 236U. Several studies employed authorized radioactive releases, including 236U, from nuclear reprocessing plants in La Hague, France, into English Channel, and Sellafield, England, Irish Sea, to trace Atlantic waters understand...
Abstract. The inflow of Atlantic Water to the Arctic Ocean is a crucial determinant for future trajectory this ocean basin with regard warming, loss sea ice, and acidification. Yet many details fate circulation these waters within remain unclear. Here, we use two long-lived anthropogenic radionuclides 129I 236U together age models constrain pathways times in surface (10–35 m depth) mid-depth layer (250–800 depth). We thereby benefit from unique time-dependent tagging by isotopes. In layer,...
Abstract. Atlantic Water circulation and associated changes play a crucial role in the future of Arctic Ocean, especially light ongoing "Atlantification" trends. Still, pathways, mixing properties, times Ocean remain to be better understood view recent variability Here, we use long-lived anthropogenic radionuclides I129 U236 investigate between Pacific Waters surface layer determine mid-depth using Transit Time Distribution (TTD) model. The study is mainly based on radionuclide data that has...
In marine systems, 210 Po and Pb disequilibria are being increasingly used to examine oceanic particle formation export. Here, an updated assessment of current methods for determining activity in samples is provided includes a complete description the vast number calculations uncertainties associated with loss, decay, ingrowth during sample processing. First, we summarize determination activities dissolved particulate seawater recommend areas improvement. Next, detail using principles error...
Abstract In this study 129 I and 236 U concentrations in seawater samples collected onboard R/V Polarstern during the PS100 expedition Fram Strait 2016 are presented. The overall aim of was to investigate distribution these long‐lived radionuclides along transect located at 79°N. combination both used for first time trace ocean circulation pathways Atlantic waters. Results show that as well U/ 238 ratios about two times higher (> 600 × 10 7 kg (−1) , > 20 6 2.8 −9 respectively) cold...
Abstract Measurements of the tracers, 129 I, CFC‐11, and SF 6 on water samples collected in Arctic Ocean 2015 have been used to calculate mean ages, Γ mixing, Δ parameters using transit time distributions (TTDs) constrain circulation mixing scales. Values determined separately two tracer pairs, ‐CFC‐11, I‐CFC‐11 are good agreement for gas solubilities estimated saturation levels 0.90, but decreases other levels. Both increase rapidly with increasing depth below base intermediate layer (ca....
After the Fukushima Dai-ichi nuclear accident, many efforts were put into determination of presence 137Cs, 134Cs, 131I, and other gamma-emitting radionuclides in ocean, but minor work was done regarding monitoring less volatile radionuclides, pure beta-ray emitters or simply with very long half-lives. In this study we document temporal evolution 129I, 236U, Pu isotopes (239Pu 240Pu) seawater sampled during four different cruises performed 2, 3, 4 years after compare results to 137Cs...
Abstract. Pathways and timescales of water mass transport in the subpolar North Atlantic Ocean (SPNA) have been investigated by many studies due to their importance for meridional overturning circulation thus global ocean. In this sense, observational data on geochemical tracers provide complementary information improve current understanding SPNA. To end, we present first simultaneous distribution artificial 129I 236U 14 depth profiles surface waters along GEOVIDE section covering a zonal...
Abstract 129 I measurements on samples collected during GEOTRACES oceanographic missions in the Arctic Ocean 2015 have provided first synoptic sections across Eurasian, Canada, and Makarov Basins. During 1990s, increased discharges of from European nuclear fuel reprocessing plants produced a large, tracer spike whose passage through has been followed by time series over past 25 years. Elevated levels measured Lomonosov Alpha‐Mendeleyev Ridges were associated with labeled, Atlantic‐origin...
Abstract This study explores for the first time possibilities that 233 U/ 236 U atom ratio offers to distinguish waters of Atlantic or Pacific origin in Arctic Ocean. entering Ocean often carry an isotopic signature dominantly originating from European reprocessing facilities with some smaller contribution global fallout nuclides, whereas northern are labeled nuclides released during atmospheric nuclear testing period only. In Ocean, originates while carries both, a and prominent signal....
Abstract Anthropogenic radionuclides 129 I and 236 U are used to investigate pathways of the Atlantic Water flow in Canada Basin, estimate transport timescales, mixing dynamics within layer overlying Pacific Water. Transit Time Distribution (TTD) model mean ages indicate water takes 25–35 years reach Basin from entrance Arctic, with limited lateral vertical along core Arctic Ocean Boundary Current. Mode obtained yield shorter times 20–32 years. These age estimates agree previous studies...