The distribution of 3He in the western Atlantic ocean

Jenkins, W. J.; Clarke, W. B.

doi:10.1016/0011-7471(76)90860-3

Cited by 90 publications

(94 citation statements)

References 14 publications

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“…Jenkins and Clarke (1976) combined measurements of 3 H and 3 He to estimate the elapsed time since the water parcel has been isolated from exchange with the atmosphere, when the 3 H-3 He clock is set to zero (called the 3 H-3 He age). This method has Figure 2.…”

Section: Presentation Of Tracersmentioning

confidence: 99%

Modelling of the anthropogenic tritium transient and its decay product helium-3 in the Mediterranean Sea using a high-resolution regional model

et al. 2015

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Abstract. This numerical study provides the first simulation of the anthropogenic tritium invasion and its decay product helium-3 ( 3 He) in the Mediterranean Sea. The simulation covers the entire tritium ( 3 H) 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 subbasin at the beginning of 1993, with a realistic timing of deep-water renewal in the eastern basin.

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Section: Presentation Of Tracersmentioning

confidence: 99%

Modelling of the anthropogenic tritium transient and its decay product helium-3 in the Mediterranean Sea using a high-resolution regional model

et al. 2015

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“…Although bomb-generated 3H has been used as a tracer for ocean circulation (e.g., OSTLUND et al, 1974;JENKINS, 1980;JENKINS and CLARKE, 1976;FINE et al, 1981), future 'H measurements will be limited by the sensitivity of the analytical instrumentation used for 3H due to its short half-life of 12.4 years. Presently there is no practical method for retrieving the 3H record from the organic matter in corals.…”

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confidence: 99%

Anomalous levels of 90Sr and 239,240Pu in Florida corals: Evidence of coastal processes

Purdy

Druffel

Hugh

1989

Geochimica et Cosmochimica Acta

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“…Extraction of the dissolved helium-The direct application of the method used in the lab to extract helium dissolved in natural waters (Jenkins 1976) proved to be inadequate to extract helium from the bulk sediment because pore-water is embedded and trapped in the solid phase of the sediment. Several tests were performed on our standard water extraction line without extruding the sediment from the copper tube.…”

Section: Materials and Proceduresmentioning

confidence: 99%

A new method for quantitative analysis of helium isotopes in sediment pore‐waters

Chaduteau

Fourré

Jean‐Baptiste

et al. 2007

Limnology & Ocean Methods

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Owing to their inertness and contrasted composition in the various earth reservoirs, helium isotopes are powerful tracers of a number of processes pertaining to geophysics and geochemistry. Because sediments cover a large portion of the earth's surface, helium isotope geochemistry of sediment pore‐waters is of particular interest. In spite of this potential, its development has been hampered by the difficulty of collecting samples without gas loss and/or contamination problems. We developed a new method for the sampling and the quantitative extraction of dissolved helium from sediment pore‐waters, leading to the determination of 3He and 4He concentration profiles. Core sampling is non‐destructive (no squeezing). The principle of the method is to use standard copper tubes (1.2 cm OD/25 cm in length), subsequently sealed with clamps, to take mini‐cores along the sediment core immediately following its retrieval. In the lab, the sediment is transferred from the copper tube to a noble gas extraction line by applying pressurized helium‐free water at one end of the copper tube. This technique allows dissolved helium to be recovered and analyzed using standard procedures for water samples. Tests were carried out successfully on an artificial core equilibrated with air to check the extraction efficiency in the same conditions as for real cores. The validity of the method was further confirmed by acquiring a vertical helium profile from a real marine core from the Zaire deep‐sea fan, illustrating some possible applications.

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The distribution of 3He in the western Atlantic ocean

Cited by 90 publications

References 14 publications

Modelling of the anthropogenic tritium transient and its decay product helium-3 in the Mediterranean Sea using a high-resolution regional model

Modelling of the anthropogenic tritium transient and its decay product helium-3 in the Mediterranean Sea using a high-resolution regional model

Anomalous levels of 90Sr and 239,240Pu in Florida corals: Evidence of coastal processes

A new method for quantitative analysis of helium isotopes in sediment pore‐waters

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