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  • 2020-2024  (4)
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  • 1
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    The Transpolar Drift as a Source of Riverine and Shelf-Derived Trace Elements to the Central Arctic Ocean (2020)
    AGU (American Geophysical Union) | Wiley
    Details
    Publication Date: 2023-02-08
    Description: A major surface circulation feature of the Arctic Ocean is the Transpolar Drift (TPD), a current that transports river‐influenced shelf water from the Laptev and East Siberian Seas toward the center of the basin and Fram Strait. In 2015, the international GEOTRACES program included a high‐resolution pan‐Arctic survey of carbon, nutrients, and a suite of trace elements and isotopes (TEIs). The cruises bisected the TPD at two locations in the central basin, which were defined by maxima in meteoric water and dissolved organic carbon concentrations that spanned 600 km horizontally and ~25‐50 m vertically. Dissolved TEIs such as Fe, Co, Ni, Cu, Hg, Nd, and Th, which are generally particle‐reactive but can be complexed by organic matter, were observed at concentrations much higher than expected for the open ocean setting. Other trace element concentrations such as Al, V, Ga, and Pb were lower than expected due to scavenging over the productive East Siberian and Laptev shelf seas. Using a combination of radionuclide tracers and ice drift modeling, the transport rate for the core of the TPD was estimated at 0.9 ± 0.4 Sv (106 m3 s‐1). This rate was used to derive the mass flux for TEIs that were enriched in the TPD, revealing the importance of lateral transport in supplying materials beneath the ice to the central Arctic Ocean and potentially to the North Atlantic Ocean via Fram Strait. Continued intensification of the Arctic hydrologic cycle and permafrost degradation will likely lead to an increase in the flux of TEIs into the Arctic Ocean.
    Type: Article , PeerReviewed
    Format: text
    Format: text
    Location Call Number Limitation Availability
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 2
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    Separating individual contributions of major Siberian rivers in the Transpolar Drift of the Arctic Ocean (2021)
    Nature Research
    Details
    Publication Date: 2024-02-07
    Description: The Siberian rivers supply large amounts of freshwater and terrestrial derived material to the Arctic Ocean. Although riverine freshwater and constituents have been identified in the central Arctic Ocean, the individual contributions of the Siberian rivers to and their spatiotemporal distributions in the Transpolar Drift (TPD), the major wind-driven current in the Eurasian sector of the Arctic Ocean, are unknown. Determining the influence of individual Siberian rivers downstream the TPD, however, is critical to forecast responses in polar and sub-polar hydrography and biogeochemistry to the anticipated individual changes in river discharge and freshwater composition. Here, we identify the contributions from the largest Siberian river systems, the Lena and Yenisei/Ob, in the TPD using dissolved neodymium isotopes and rare earth element concentrations. We further demonstrate their vertical and lateral separation that is likely due to distinct temporal emplacements of Lena and Yenisei/Ob waters in the TPD as well as prior mixing of Yenisei/Ob water with ambient waters.
    Type: Article , PeerReviewed
    Format: text
    Format: text
    Location Call Number Limitation Availability
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    OceanRep: Article in a Scientific Journal - peer-reviewed
  • 3
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    Dissolved rare earth element concentrations and neodymium isotope compositions in the central Arctic Ocean during FS Polarstern PS94 (GEOTRACES GN04) (2021)
    PANGAEA
    Details
    Publication Date: 2023-12-09
    Description: We present spatially highly resolved distributions of dissolved seawater rare earth element concentrations and neodymium isotopes along a transect in the central Arctic Ocean from FS Polarstern cruise PS94 (GEOTRACES GN04) in August-October 2015. Seawater samples were collected using Niskin bottles and filtered through AcroPak 500 filter cartridges (pore size 0.8/0.2 µm) directly from the Niskin bottles onboard.
    Keywords: Arctic Ocean; ARK-XXIX/3; Based on definitions by Rudels et al. (2012); Bottle number; Calculated, PAAS-normalized (Rudnick and Gao, 2003); Cerium, dissolved; Cerium anomaly, dissolved; Comment; CTD/Rosette; CTD/Rosette, ultra clean; CTD-RO; CTD-UC; DATE/TIME; DEPTH, water; Dysprosium, dissolved; ELEVATION; Erbium, dissolved; Europium, dissolved; Europium anomaly, dissolved; Event label; Gadolinium, dissolved; Gadolinium anomaly, dissolved; GEOTRACES; Global marine biogeochemical cycles of trace elements and their isotopes; Heavy rare-earth elements/light rare-earth elements ratio, dissolved; Holmium, dissolved; Lanthanum, dissolved; LATITUDE; LONGITUDE; Lutetium, dissolved; Neodymium, dissolved; Neodymium isotopes; Polarstern; Praseodymium, dissolved; PS94; PS94/032-7; PS94/032-9; PS94/040-1; PS94/040-3; PS94/050-1; PS94/050-4; PS94/050-6; PS94/050-8; PS94/058-1; PS94/058-3; PS94/068-1; PS94/069-2; PS94/069-4; PS94/070-1; PS94/070-4; PS94/081-2; PS94/081-5; PS94/096-2; PS94/096-7; PS94/101-2; PS94/101-5; PS94/101-7; PS94/115-1; PS94/117-2; PS94/117-4; PS94/125-2; PS94/125-5; PS94/134-1; Rare earth elements; Salinity; Samarium, dissolved; Temperature, water; Terbium, dissolved; Thulium, dissolved; Water mass; Ytterbium, dissolved; ε-Neodymium, dissolved; ε-Neodymium, error, dissolved
    Type: Dataset
    Format: text/tab-separated-values, 3320 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
  • 4
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    Particulate rare earth element concentrations and neodymium isotope compositions in the central Arctic Ocean during FS Polarstern PS94 (GEOTRACES GN04) (2021)
    PANGAEA
    Details
    Publication Date: 2023-12-09
    Description: We present spatially highly resolved distributions of particulate seawater rare earth element concentrations and neodymium isotopes along a transect in the central Arctic Ocean from FS Polarstern cruise PS94 (GEOTRACES GN04) in August-October 2015. Particle samples were taken using in-situ pumps and Supor filters (pore size 0.45 μm).
    Keywords: Arctic Ocean; ARK-XXIX/3; Calculated; Cerium, particulate; Cerium anomaly, particulate; Comment; CTD/Rosette, ultra clean; CTD-UC; DATE/TIME; DEPTH, water; Dysprosium, particulate; ELEVATION; Erbium, particulate; Europium, particulate; Europium anomaly, particulate; Event label; Gadolinium, particulate; Gadolinium anomaly, particulate; GEOTRACES; Global marine biogeochemical cycles of trace elements and their isotopes; Heavy rare-earth elements/light rare-earth elements ratio, particulate; Holmium, particulate; In situ pump; ISP; Lanthanum, particulate; LATITUDE; LONGITUDE; Lutetium, particulate; Neodymium, particulate; Neodymium, particulate, authigenic; Neodymium, particulate, lithogenic; Neodymium isotopes; Polarstern; Praseodymium, particulate; PS94; PS94/032-8; PS94/050-5; PS94/069-2; PS94/070-4; PS94/081-9; PS94/096-5; PS94/101-6; PS94/117-7; PS94/125-8; Rare earth elements; Samarium, particulate; Terbium, particulate; Thulium, particulate; Ytterbium, particulate; ε-Neodymium, error, particulate; ε-Neodymium, particulate
    Type: Dataset
    Format: text/tab-separated-values, 1492 data points
    Location Call Number Limitation Availability
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    DATA PANGAEA
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