Neodymium isotopes trace marine provenance of Arctic sea ice

IF 3.4 1区地球科学 Q1 GEOCHEMISTRY & GEOPHYSICS

Geochemical Perspectives Letters Pub Date : 2022-06-01 DOI:10.7185/geochemlet.2220

G. Laukert, I. Peeken, D. Bauch, T. Krumpen, E. Hathorne, K. Werner, M. Gutjahr, M. Frank

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引用次数: 1

Abstract

https://doi.org/10.7185/geochemlet.2220 Radiogenic neodymium (Nd) isotopes (εNd) have the potential to serve as a geochemical tracer of the marine origin of Arctic sea ice. This capability results from pronounced εNd differences between the distinct marine and riverine sources, which feed the surface waters from which the ice forms. The first dissolved Nd isotope and rare earth element (REE) concentration data obtained from Arctic sea ice collected across the Fram Strait during RV Polarstern cruise PS85 in 2014 confirm the incorporation and preservation of the parental surface seawater εNd signatures despite efficient REE rejection. The large εNd variability between ice floes and within sea ice cores (−32 to −10) reflects changes in water mass distribution during ice growth and drift from the central Arctic Ocean to Fram Strait. In addition to the parental seawater composition, our new approach facilitates the reconstruction of the transfer of matter between the atmosphere, the sea ice and the ocean. In conjunction with satellite-derived drift trajectories, we enable a more accurate assessment of sea ice origin and spatiotemporal evolution, benefiting studies of sea ice biology, biodiversity, and biogeochemistry. Received 6 January 2022 | Accepted 5 May 2022 | Published 10 June 2022

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钕同位素追踪北极海冰的海洋来源

https://doi.org/10.7185/geochemlet.2220放射性钕(Nd)同位素(εNd)有潜力作为北极海冰海洋起源的地球化学示踪剂。这种能力是由于不同的海洋和河流来源之间明显的εNd差异造成的，它们为形成冰的地表水提供水源。2014年北极星号巡洋舰PS85在海峡两岸收集的北极海冰中首次获得的溶解Nd同位素和稀土元素(REE)浓度数据证实了母海水表面εNd特征的存在和保存，尽管REE被有效地剔除。浮冰之间和海冰芯内(- 32 ~ - 10)的εNd大变异性反映了冰生长和从北冰洋中部向弗拉姆海峡漂移过程中水质量分布的变化。除了母体海水组成外，我们的新方法还有助于重建大气、海冰和海洋之间的物质转移。结合卫星衍生的漂移轨迹，我们能够更准确地评估海冰的起源和时空演变，有利于海冰生物学、生物多样性和生物地球化学的研究。接收2022年1月6日bb0接收2022年5月5日|发布2022年6月10日

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来源期刊

Geochemical Perspectives Letters Earth and Planetary Sciences-Geochemistry and Petrology

CiteScore

7.00

自引率

2.00%

发文量

审稿时长

15 weeks

期刊介绍： Geochemical Perspectives Letters is an open access, internationally peer-reviewed journal of the European Association of Geochemistry (EAG) that publishes short, highest-quality articles spanning geochemical sciences. The journal aims at rapid publication of the most novel research in geochemistry with a focus on outstanding quality, international importance, originality, and stimulating new developments across the vast array of geochemical disciplines.