Transport of newly ventilated deep water from the Iceland Basin to the Westeuropean Basin |
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| Institution: | 1. Institut für Umweltphysik, Universität Bremen, Postfach 330440, D-28334 Bremen, Germany;2. Institut für Umweltphysik, Universität Heidelberg, Im Neuenheimer Feld 229, D-69120 Heidelberg, Germany;1. BEV - Federal Office of Metrology and Surveying, Austria;2. BOKU - University of Natural Resources and Life Sciences, Vienna, Austria;3. ENEA - Agenzia Nazionale per le nuove tecnologie l’energia e lo sviluppo economico sostenibile, Italy;4. CEA/LNHB - Commissariat à l’énergie atomique et aux énergies alternatives, France;5. CIEMAT, Spain;6. National Physical Laboratory, United Kingdom;7. SURO - Statni ustav radiacni ochrany v.v.i., Czechia;8. JRC-Geel, European Commission, Belgium;9. Czech Metrological Institute, Czechia;10. NRPA - Norwegian Radiation Protection Authority, Norway;11. GIG - Glowny Instytut Gornictwa, Poland;12. IRSN - Institut de Radioprotection et de Sûreté Nucléaire, France;13. STUK – Sateilyturvakeskus, Finland;14. IST - Instituto Superior Tecnico, Portugal;15. MKEH - Magyar Kereskedelmi Engedelyezesi Hivatal, Hungary;p. IJS - Institut Jozef Stefan, Slovenia;1. Department of Nuclear Chemistry, Czech Technical University in Prague, 115 19 Praha 1, Czech Republic;2. VERA Laboratory, Institute of Isotopic Research and Nuclear Physics, University of Vienna, Währinger Straße 17, A1090 Vienna, Austria;1. Department of Physics, A. E. Lalonde AMS Laboratory, University of Ottawa, 25 Templeton St., Ottawa, ON K1N 6N5, Canada;2. Department of Earth and Environmental Sciences, A. E. Lalonde AMS Laboratory, University of Ottawa, 25 Templeton St., Ottawa, ON K1N 6N5, Canada;3. Directorate of Security and Safeguards, Canadian Nuclear Safety Commission (CNSC), 280 Slater St., P.O. Box 1046 – Station B, Ottawa, ON K1P 5S9, Canada |
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| Abstract: | Increased values of trichlorofluoromethane (CFC-11), tritium and stable tritium in the depth range from 2500 to 3500 m at the eastern flank of the Mid-Atlantic Ridge at 48°N (WHP section A2) indicate an influence of newly ventilated water. Water with similar Θ, S and tracer properties is found on the WHP section A1 (55°N) situated north of the Gibbs Fracture Zone in the Iceland Basin. The high tracer concentrations are due to the influence of Iceland Scotland Overflow Water (ISOW). The ISOW-influenced water found in the Iceland Basin partially passes by the Gibbs Fracture Zone (52°N) and flows southward along the topography of the Mid-Atlantic Ridge. A quantitative analysis of the transport from the Iceland Basin to the Westeuropean Basin is carried out based on the assumption that the water with enhanced tracer values is a two-component mixture of recirculating North East Atlantic Deep Water from the eastern part of the Westeuropean Basin and ISOW-influenced water as found on A1 in the Iceland Basin (NEADWIB). The composition of the mixture and the transport time for the NEADWIB are deduced from the temporal evolution of the tracer values. From the distance between the two sections and the area with enhanced tracer values, a transport of NEADWIB from the Iceland Basin to the Westeuropean Basin of 1.63±0.32 Sv1 is calculated for the density range 41.37<σ3<41.475. Transports between 2.4 and 3.5 Sv result if the transport in the former density range is extrapolated to 41.35<σ3<41.52 (corresponding to σΘ>27.8) in different ways. |
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