An Overview of Noble Gas Geochemistry and Cosmochemistry

Porcelli, D.; Ballentine, C. J.; Wieler, R.

doi:10.2138/rmg.2002.47.1

Cited by 113 publications

(92 citation statements)

References 91 publications

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“…The Lott and Jenkins is solubility ∼2 % higher than published data from Weiss (1971). The He solubility is for bulk He and we calculate the 3 He solubility using an atmosperic mole ratio ( ( Mamyrin et al, 1970;Porcelli et al, 2002), although some more recent results indicate the current ratio may be slightly lower, ≃1.390 x 10 −6 (Brennwald et al, 2013b). We use the He equilibrium isotopic fractionation as described in Benson and Krause (1980b).…”

Section: Measurement Of 3 Hementioning

confidence: 99%

Insight into chemical, biological, and physical processes in coastal waters from dissolved oxygen and inert gas tracers

Manning¹

2017

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In this thesis, I use coastal measurements of dissolved O 2 and inert gases to provide insight into the chemical, biological, and physical processes that impact the oceanic cycles of carbon and dissolved gases. Dissolved O 2 concentration and triple isotopic composition trace net and gross biological productivity. The saturation states of inert gases trace physical processes, such as air-water gas exchange, temperature change, and mixing, that affect all gases.First, I developed a field-deployable system that measures Ne, Ar, Kr, and Xe gas ratios in water. It has precision and accuracy of 1 % or better, enables near-continuous measurements, and has much lower cost compared to existing laboratory-based methods. The system will increase the scientific community's access to use dissolved noble gases as environmental tracers.Second, I measured O 2 and five noble gases during a cruise in Monterey Bay, California. I developed a vertical model and found that accurately parameterizing bubble-mediated gas exchange was necessary to accurately simulate the He and Ne measurements. I present the first comparison of multiple gas tracer, incubation, and sediment trap-based productivity estimates in the coastal ocean. Net community production estimated from 15 NO -3 uptake and O 2 /Ar gave equivalent results at steady state. Underway O 2 /Ar measurements revealed submesoscale variability that was not apparent from daily incubations.Third, I quantified productivity by O 2 mass balance and air-water gas exchange by dual tracer ( 3 He/SF 6 ) release during ice melt in the Bras d'Or Lakes, a Canadian estuary. The gas transfer velocity at >90 % ice cover was 6 % of the rate for nearly ice-free conditions. Rates of volumetric gross primary production were similar when the estuary was completely ice-covered and ice-free, and the ecosystem was on average net autotrophic during ice melt and net heterotrophic following ice melt. I present a method for incorporating the isotopic composition of H 2 O into the O 2 isotope-based productivity calculations, which increases the estimated gross primary production in this study by 46-97 %.In summary, I describe a new noble gas analysis system and apply O 2 and inert gas observations in new ways to study chemical, biological, and physical processes in coastal waters.

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Section: Measurement Of 3 Hementioning

confidence: 99%

Insight into chemical, biological, and physical processes in coastal waters from dissolved oxygen and inert gas tracers

Manning¹

2017

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“…There is relatively little information about 38 Ar/ 36 Ar ratios, which commonly do not deviate substantially from the atmospheric value. Porcelli and Ballentine [26] conclude there is no reliable evidence for Ar in rocks from the Earth's mantle. Small deviations can be produced by mass-dependent fractionation processes such as diffusion, dissolution, and degassing.…”

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Variation in the terrestrial isotopic composition and atomic weight of argon (IUPAC Technical Report)

Böhlke

2014

Pure and Applied Chemistry

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Abstract:The isotopic composition and atomic weight of argon (Ar) are variable in terrestrial materials. Those variations are a source of uncertainty in the assignment of standard properties for Ar, but they provide useful information in many areas of science. Variations in the stable isotopic composition and atomic weight of Ar are caused by several different processes, including (1) isotope production from other elements by radioactive decay (radiogenic isotopes) or other nuclear transformations (e.g., nucleogenic isotopes), and (2) Ar) at various levels of precision are widely used for studies in geochronology, water-rock interaction, atmospheric evolution, and other fields.

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“…The Lott and Jenkins is solubility ∼2 % higher than published data from Weiss (1971). The He solubility is for bulk He and we calculate the 3 He solubility using an atmosperic mole ratio M( 3 He)/M( 4 He) = 1.399x10 −6 (Mamyrin et al, 1970;Porcelli et al, 2002), although some more recent results indicate the current ratio may be slightly lower, 1.390 x 10 −6 (Brennwald et al, 2013). We use the He equilibrium isotopic fractionation as described in Benson and Krause (1980b).…”

Section: Measurement Of 3 Hementioning

confidence: 99%

Changes in gross oxygen production, net oxygen production, and air-water gas exchange during seasonal ice melt in the Bras d'Or Lake, a Canadian estuary

Manning

Stanley

Nicholson

et al. 2017

Preprint

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Abstract. Sea ice is an important control on gas exchange and primary production in polar regions. We measured net oxygen production and gross oxygen production using near-continuous measurements of the O 2 /Ar gas ratio and discrete measurements of the triple isotopic composition of O 2 in the Bras d'Or Lake, an estuary in Nova Scotia, Canada, as the bay transitioned from ice-covered to ice-free conditions. The volumetric gross oxygen production was 5.4( +2.8 −1.6 ) mmol O 2 m −3 d −1 , similar at the beginning and end of the time-series, and likely peaked at the end of the ice melt period. Net oxygen production displayed more 5 temporal variability and the system was on average net autotrophic during ice melt and net heterotrophic following the ice melt.We performed the first field-based dual tracer release experiment in ice-covered water to quantify air-water gas exchange. The gas transfer velocity at >90 % ice cover was 6 % of the rate for nearly ice-free conditions. Published studies have shown a wide range of results for gas transfer velocity in the presence of ice, and this study indicates that gas transfer through ice is much slower than the rate of gas transfer through open water. The results also indicate that both primary producers and heterotrophs 10 are active in Whycocomagh Bay during spring while it is covered in ice.

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An Overview of Noble Gas Geochemistry and Cosmochemistry

Cited by 113 publications

References 91 publications

Insight into chemical, biological, and physical processes in coastal waters from dissolved oxygen and inert gas tracers

Insight into chemical, biological, and physical processes in coastal waters from dissolved oxygen and inert gas tracers

Variation in the terrestrial isotopic composition and atomic weight of argon (IUPAC Technical Report)

Changes in gross oxygen production, net oxygen production, and air-water gas exchange during seasonal ice melt in the Bras d'Or Lake, a Canadian estuary

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