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| Titel |
Modelling of the anthropogenic tritium transient and its decay product helium-3 in the Mediterranean Sea using a high-resolution regional model |
| VerfasserIn |
M. Ayache, J.-C. Dutay, P. Jean-Baptiste, K. Béranger, T. Arsouze, J. Beuvier, J. Palmieri, B. Le-Vu, W. Roether |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1812-0784
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| Digitales Dokument |
URL |
| Erschienen |
In: Ocean Science ; 11, no. 3 ; Nr. 11, no. 3 (2015-05-12), S.323-342 |
| Datensatznummer |
250117220
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| Publikation (Nr.) |
 copernicus.org/os-11-323-2015.pdf |
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| Zusammenfassung |
This numerical study provides the first simulation of the anthropogenic tritium
invasion and its decay product helium-3 (3He) in the Mediterranean Sea. The
simulation covers the entire tritium (3H) transient generated by the atmospheric
nuclear weapons tests performed in the 1950s and early 1960s and is run till 2011. Tritium,
helium-3 and their derived age estimates are particularly suitable for studying intermediate
and deep-water ventilation and spreading of water masses at intermediate/deep levels.
The simulation is made using a high-resolution regional model NEMO (Nucleus for European
Modelling of the Ocean), in a regional configuration for the Mediterranean Sea called MED12,
forced at the surface with prescribed tritium evolution derived from observations.
The simulation is compared to measurements of tritium and helium-3 performed along large-scale
transects in the Mediterranean Sea during the last few decades on cruises of
R/V Meteor: M5/6, M31/1, M44/4, M51/2, M84/3, and R/V Poseidon: 234. The results show that
the input function used for the tritium generates a realistic distribution of the
main hydrographic features of the Mediterranean Sea circulation. In the eastern basin,
the results highlight the weak formation of Adriatic Deep Water in the model, which
explains its weak contribution to the Eastern Mediterranean Deep Water (EMDW) in the Ionian
sub-basin. It produces a realistic representation of the Eastern Mediterranean
Transient (EMT)
signal, simulating a deep-water formation in the Aegean sub-basin at the beginning of
1993, with a realistic timing of deep-water renewal in the eastern basin. |
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