Department Surface Waters - Research and Management

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   0 => Snowflake\Publications\Domain\Model\Publicationprototypepersistent entity (uid=36380, pid=124)
      originalId => protected36380 (integer)
      authors => protected'Chiu, C. F.; Archer, C.; Vance, D.; de Souza, G.&nb
         sp;F.; Ellwood, M. J.; Janssen, D. J.' (133 chars)
      title => protected'Elucidating the role of biogenic and authigenic phases in marine cycling of 
         nickel with paired dissolved and particulate nickel isotopes' (136 chars)
      journal => protected'Earth and Planetary Sciences Letters' (36 chars)
      year => protected2026 (integer)
      volume => protected681 (integer)
      issue => protected'' (0 chars)
      startpage => protected'119934 (11 pp.)' (15 chars)
      otherpage => protected'' (0 chars)
      categories => protected'nickel isotopes; particles; Southern Ocean; GEOTRACES; subtropical front; pr
         oductivity' (86 chars)
      description => protected'Nickel (Ni) is a bio-essential trace metal for marine phytoplankton, serving
          as a cofactor in key enzymes. Its nutrient-like distribution and the mirror
         ed distribution of δ<sup>60</sup>Ni in seawater suggest that δ<sup>60</sup
         >Ni could serve as a tracer of biological Ni cycling. However, particulate N
         i (pNi) remains understudied despite its important role. Here, we present th
         ree coupled dissolved and particulate δ<sup>60</sup>Ni profiles from distin
         ct biogeochemical regimes across the Subtropical Front in the Australian sec
         tor of the Southern Ocean.<br />In surface waters, pNi is isotopically light
         er than co-located dissolved Ni, and particulate Ni/P in the mixed layer fal
         ls within the range observed for phytoplankton, reflecting an association wi
         th organic matter. These results support previous studies suggesting that ph
         ytoplankton preferentially remove isotopically light Ni. In the subtropics, 
         higher surface productivity corresponds to elevated mixed layer pNi concentr
         ations, below which pNi declines, associated with the regeneration of organi
         c matter. However, particulate δ<sup>60</sup>Ni shows limited variation, im
         plying minimal isotope fractionation during this process. At subantarctic st
         ations, pNi concentrations remain relatively constant, while particulate δ<
         sup>60</sup>Ni decreases with depth in the upper 300 m. Moreover, δ<sup>60<
         /sup>Ni offsets between the dissolved and particulate phases are smaller tha
         n for the subtropical counterpart, likely associated with different phytopla
         nkton assemblages. At greater depth, particulate Mn/P increases, and Ni/P ra
         tios exceed those of phytoplankton. This suggests a shift in pNi association
          from organic-rich to Mn-rich phases, with minimal change in total particula
         te δ<sup>60</sup>Ni. These findings suggest a more complex internal cycling
          of Ni in the oceans than one driven solely by biological processes.' (1892 chars)
      serialnumber => protected'0012-821X' (9 chars)
      doi => protected'10.1016/j.epsl.2026.119934' (26 chars)
      uid => protected36380 (integer)
      _localizedUid => protected36380 (integer)modified
      _languageUid => protectedNULL
      _versionedUid => protected36380 (integer)modified
      pid => protected124 (integer)