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The Transient Distributions of Nuclear Weapon-generated Tritium and Its Decay Product 3He in the Mediterranean Sea, 1952–2011, and Their Oceanographic Potential : Volume 10, Issue 2 (03/04/2013)

By Roether, W.

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Book Id: WPLBN0004020757
Format Type: PDF Article :
File Size: Pages 42
Reproduction Date: 2015

Title: The Transient Distributions of Nuclear Weapon-generated Tritium and Its Decay Product 3He in the Mediterranean Sea, 1952–2011, and Their Oceanographic Potential : Volume 10, Issue 2 (03/04/2013)  
Author: Roether, W.
Volume: Vol. 10, Issue 2
Language: English
Subject: Science, Ocean, Science
Collections: Periodicals: Journal and Magazine Collection, Copernicus GmbH
Publication Date:
Publisher: Copernicus Gmbh, Göttingen, Germany
Member Page: Copernicus Publications


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Jean-Baptiste, P., Fourré, E., Sültenfuß, J., & Roether, W. (2013). The Transient Distributions of Nuclear Weapon-generated Tritium and Its Decay Product 3He in the Mediterranean Sea, 1952–2011, and Their Oceanographic Potential : Volume 10, Issue 2 (03/04/2013). Retrieved from

Description: Institut für Umweltphysik, University Bremen, Otto Hahn Allee, 28355, Bremen, Germany. We present a comprehensive account of tritium and 3He in the Mediterranean Sea since the appearance of the tritium generated by the atmospheric nuclear-weapon testing in the 1950's and early 1960's, based on essentially all available observations. Tritium in surface waters rose to 20–30 TU in 1964 (TU = 1018 · [3H]/[H]), a factor of about 100 above the natural level, and thereafter declined 30-fold up to 2011. The decline was largely due to radioactive tritium decay, which produced significant amounts of its stable daughter 3He. We present the scheme by which we separate the tritiugenic part of 3He and the part due to release from the sea floor (terrigenic part). We show that the tritiugenic component can be quantified throughout the Mediterranean waters, typically to a ±0.15 TU equivalent, mostly because the terrigenic part is low in 3He. This fact makes the Mediterranean unique in offering a potential for the use of tritiugenic 3He as a tracer. The transient distributions of the two tracers are illustrated by a number of sections spanning the entire sea and relevant features of their distributions are noted. By 2011, the 3He concentrations in the top few hundred meters had become low, in response to the decreasing tritium concentrations combined with a flushing out by the general westward drift of these waters. Tritium-3He ages in Levantine Intermediate Water (LIW) were obtained repeated in time at different locations, defining transit times from the LIW source region east of Rhodes. The ages show an upward trend with the time elapsed since the surface-water tritium maximum, which arises because the repeated observations represent increasingly slower moving parts of the full transit time spectrum of LIW. The transit time dispersion found by this new application of tritium-3He dating is considerable. We find mean transit times of 12 ± 2 yr up to the Strait of Sicily, 18 ± 3 yr up to the Tyrrhenian Sea, and 22 ± 4 yr up into the Western Mediterranean. We furthermore present full Eastern Mediterranean sections of terrigenic 3He and tritium-3He age in 1987, the latter one similarly showing an effect of the transit time dispersion. We conclude that the available tritium and 3He data, in particular if combined with other tracer data, are useful for constraining the subsurface circulation and mixing of the Mediterranean Sea.

The transient distributions of nuclear weapon-generated tritium and its decay product 3He in the Mediterranean Sea, 1952–2011, and their oceanographic potential

Andrie, C. and Merlivat, L.: Tritium in the western Mediterranean during the 1981 Phycemed cruise, Deep-Sea Res. Pt. I, 35, 247–267, 1988.; Benson, B. B. and Krause, D.: Isotopic fractionation of helium during solution: a probe for the liquid state, J. Solut. Chem., 9, 895–909, 1980.; Charlou, J. L., Donval, J. P., Roy, N., Jean-Baptiste, P., Foucher, J. P., Woodside, J., and the MEDINAUT Scientific Party: Evidence of methane venting and geochemistry of brines associated with mud volcanoes of the eastern Mediterranean sea (MEDINAUT diving cruise, 1998), Deep-Sea Res. Pt. I, 50, 941–958, 2003.; Clarke, W. B., Jenkins, W. J., and Top, Z.: Determination of tritium by mass spectrometric measurement of 3He, Int. J. Appl. Radiat. Isotopes, 27, 515–522, 1976.; Cortecci, G., Noto, P., and Tonarelli, B.: Tritium and oxygen profiles in the eastern Mediterranean, Tellus 31, 179–183, 1979.; Dreisigacker, E. and Roether, W.: Tritium and 90-strontium in North Atlantic surface water, Earth Planet. Sci. Lett., 38, 301–312, 1978.; Gačić, M., Schroeder, K., Civitarese, G., Cosoli, S., Vetrano, A., and Eusebi Borzelli, G. L.: Salinity in the Sicily Channel corroborates the role of the Adriatic–Ionian Bimodal Oscillating System (BiOS) in shaping the decadal variability of the Mediterranean overturning circulation, Ocean Sci., 9, 83–90, doi:10.5194/os-9-83-2013, 2013.; Gasparini, G. P., Ortona, A., Budillon, B., Astraldi, M., and Sansone, E.: The effect of the Eastern Mediterranean Transient on the hydrographic characteristics in the Strait of Sicily and in the Tyrrhenian Sea, Deep-Sea Res. Pt. I, 52, 915–935, 2005.; Huhn, O., Roether, W., and Steinfeldt, R.: Age spectra in North Atlantic Deep Water along the South American continental slope, 10{\degree} N–30{\degree} S, based on tracer observations, Deep-Sea Res. Pt. I, 55, 1252–1276, doi:10.1016/j.dsr.2008.05.016, 2008.; Jean-Baptiste, P., Mantisi, F., Dapoigny, A., and Stievenard, M.: Design and performance of a mass spectrometric facility for measuring helium isotopes in natural waters and for low-levle tritium determination by the 3He ingrowth method, Appl. Radiat. Isot., 43, 881–891, 1992.; Klein, B., Roether, W., Manca, B., Bregant, D., Beitzel, V., Kovacevic, V., and Luchetta, A.: The large deep water transient in the Eastern Mediterranean, Deep-Sea Res. Pt. I, 46, 371–414, 1999.; Lucas, L. L. and Unterweger, M. P.: Comprehensive review and critical evaluation of the half-life of tritium, J. Res. Natl. Inst. Stand. Tech., 105, 541–549, 2000.; Lupton, J., de Ronde, C., Spovieri, M., Baker, E. T., Bruno, P. P., Italiano, F., Walker, S., Faure, K., Leybourne, M., Britten, K., and Greene, R.: Active hydrothermal discharge on the submarine Aeolian Arc, J. Geophys, Res., 116, B02102, doi:10.1029/2010JB007738, 2011.; Millot, C.: Circulation in the Western Mediterranean Sea, J. Mar. Systems, 20, 423–442, 1999.; Millot, C. and Taupier-Letage, I.: Circulation in the Mediterranean Sea, in: The Handbook of Environmental Chemistry, vol. 5, P


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