JNdi-1: a neodymium isotopic reference in consistency with LaJolla neodymium

Tanaka, Tsuyoshi; Togashi, S.; Kamioka, Hikari; Amakawa, Hiroshi; Kagami, Hiroo; Hamamoto, Takuji; Yoshio, Masaki; Orihashi, Yuji; Yoneda, Shigekazu; Shimizu, Hiroshi; Kunimaru, Takanori; Takahashi, Kazuya; Yanagi, Tetsuo; Nakano, Takanori; Fujimaki, Haruyuki; Shinjo, Ryuichi; Asahara, Yoshihiro; Tanimizu, Masaharu; Drăguşanu, Cristian

doi:10.1016/s0009-2541(00)00198-4

Cited by 1,459 publications

(577 citation statements)

References 3 publications

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“…Results obtained for these materials are 143 Nd/ 144 Nd = 0.512113 ±2 (2σ m , n = 64) and 143 Nd/ 144 Nd = 0.512991 ±4 (2σ m , n = 16) for JNdi-1 and BHVO-2, respectively. These results are in agreement with previously published data (62,63 Here, e Nd is calculated relative to ( 143 Nd/ 144 Nd) CHUR 0.512638 (64). Uncertainties for e Nd are reported as 2σ.…”

Section: Methodssupporting

confidence: 92%

Abrupt drainage cycles of the Fennoscandian Ice Sheet

Soulet

Ménot

Bayon

et al. 2013

Proc. Natl. Acad. Sci. U.S.A.

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Continental ice sheets are a key component of the Earth's climate system, but their internal dynamics need to be further studied. Since the last deglaciation, the northern Eurasian Fennoscandian Ice Sheet (FIS) has been connected to the Black Sea (BS) watershed, making this basin a suitable location to investigate former icesheet dynamics. Here, from a core retrieved in the BS, we combine the use of neodymium isotopes, high-resolution elemental analysis, and biomarkers to trace changes in sediment provenance and river runoff. We reveal cyclic releases of meltwater originating from Lake Disna, a proglacial lake linked to the FIS during Heinrich Stadial 1. Regional interactions within the climate-lake-FIS system, linked to changes in the availability of subglacial water, led to abrupt drainage cycles of the FIS into the BS watershed. This phenomenon raised the BS water level by ∼100 m until the sill of the Bosphorus Strait was reached, flooding the vast northwestern BS shelf and deeply affecting the hydrology and circulation of the BS and, probably, of the Marmara and Aegean Seas.ice dynamics | meltwater routing | European hydrographic network

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Section: Methodssupporting

confidence: 92%

Abrupt drainage cycles of the Fennoscandian Ice Sheet

Soulet

Ménot

Bayon

et al. 2013

Proc. Natl. Acad. Sci. U.S.A.

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“…The measured Nd isotopic ratios were normalized to 146 Nd/ 144 Nd = 0.7219. During the Nd isotopic measurements, the isotopic ratios measured for the standards, i.e., La Jolla and JNdi-1 (supplied by the Geological Survey of Japan), were 0.511856 ± 0.000007 (2s, n = 9) and 0.512112 ± 0.000006 (2s, n = 29), respectively, and were in good agreement with those reported by O'Nions et al (1977) and Tanaka et al (2000). As the contribution of blank to each sample was less than 1%, no blank correction was performed.…”

Section: Methodssupporting

confidence: 81%

Nd concentration and isotopic composition distributions in surface waters of Northwest Pacific Ocean and its adjacent seas

2004

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Nd isotopic composition and concentration distributions were determined in surface waters of the Northwest Pacific Ocean and its adjacent seas, i.e., the Okhotsk and Japan Seas. The Okhotsk and Japan Seas samples showed higher Nd concentrations (19~31 pmol/kg) than the Northwest Pacific Ocean samples, suggesting a large amount of Nd input from the land areas surrounding the Okhotsk and Japan Seas. Although the Nd isotopic composition data were limited for those regions, each oceanic area showed a distinctive value. The lone sample from the Okhotsk Sea had radiogenic Nd (e Nd = -3.6) that was comparable to samples from the Pacific Ocean, indicating a large amount of radiogenic Nd supply from the Kuril Islands. On the other hand, the Japan Sea samples had the most highly unradiogenic Nd (e Nd = -8.9~-7.2). The southernmost sample had the most negative value, due to the influence of the Tsushima Warm Current (TWC) having a low e Nd value. The latitudinal distributions of Nd isotopic composition and concentration in the surface waters of the Northwest Pacific Ocean showed marked variations. Nd concentration was low at low latitudes (3~8 pmol/kg) and was increased with increasing latitude (16~20 pmol/kg). On the other hand, Nd isotopic composition showed a mid-latitude minimum (e Nd = ~-6) and high e Nd values at low and high latitudes (e Nd = -2~-1). The distribution of the e Nd values seemed to be controlled by three currents: Kuroshio Extension, Oyashio Current and North Equatorial Current (NEC). The Kuroshio Extension, which showed a low e Nd value, seemed to play an important role in transporting continentally derived Nd to the central Pacific. The Oyashio Current and NEC are supplied with large amounts of radiogenic Nd from the Kuril and Aleutian Islands, and the Hawaiian Islands, respectively.Based on the Nd isotopic composition and concentration distributions, we calculated the radiogenic Nd flux to the Pacific Ocean surface waters and estimated the Nd residence time. Our calculation suggested that the radiogenic Nd flux required to account for the Nd isotopic composition is higher than 70% of the unradiogenic Nd flux including Nd remobilization from coastal and shelf sediments and atmospheric input. It was also revealed that a large Nd remobilization flux is necessary to attain a global Nd residence time of ~400 y as estimated in previous studies.

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“…The mass-fractionation correction was made by monitoring 146 Nd/ 144 Nd and applying an exponential-fractionation correction. Samples were analyzed during nine sessions, and each sample was bracketed with analyses of the JNdi-1 neodymium isotopic standard (Tanaka et al, 2000). The samples were standard corrected to a value of 0.512118 ±7 for the JNdi-1 neodymium isotopic standard, which is based on our own in-laboratory cross calibration between JNdi-1 and La Jolla, which is within error of the value of 0.512115 ±7 reported by (Tanaka et al, 2000).…”

Section: Methodsmentioning

confidence: 81%

Indian Ocean circulation and productivity during the last glacial cycle

Piotrowski

Banakar

Scrivner

et al. 2009

Earth and Planetary Science Letters

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The Indian Ocean is an important part of the global thermohaline circulation system, receiving deep waters sourced from the Southern Ocean and being the location of upwelling and surface-ocean current flow, which returns warm and salty waters to the Atlantic. It is also an ideal location to reconstruct the link between thermohaline circulation and deep-water nutrient contents. No mixing occurs between major deep-water masses along flow paths within the Indian Ocean, so changes in water-mass provenance reflect changes in deep-ocean circulation while nutrient contents reflect addition and dissolution of organic matter. We present neodymium (Nd) and carbon (C) isotope records, proxies of water-mass provenance and nutrient contents, respectively, from an equatorial Indian Ocean core (SK129−CR2) spanning the last 150 kyr. The Nd isotope record shows that an increased proportion of North Atlantic Deep Water (NADW) reached the Indian Ocean during interglacials (marine isotope stages, MIS 1 and 5), and a reduced proportion during glacials (MIS 2, 4, and 6), and also that changes occurred during

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JNdi-1: a neodymium isotopic reference in consistency with LaJolla neodymium

Cited by 1,459 publications

References 3 publications

Abrupt drainage cycles of the Fennoscandian Ice Sheet

Abrupt drainage cycles of the Fennoscandian Ice Sheet

Nd concentration and isotopic composition distributions in surface waters of Northwest Pacific Ocean and its adjacent seas

Indian Ocean circulation and productivity during the last glacial cycle

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