@article{fdi:010095468,
  title = {{S}ignificant impact of lithogenic dissolution from subantarctic volcanic islands on the regional marine silicon cycle},
  author = {{C}otard, {E}. and {D}eteix, {V}. and {V}ivier, {F}. and {D}apoigny, {A}. and {C}aquineau, {S}andrine and {C}ardinal, {D}.},
  editor = {},
  language = {{ENG}},
  abstract = {{S}ilicic acid controls the production of diatoms, a predominant phytoplankton in the {S}outhern {O}cean. {D}iatoms are major contributors to the biological carbon pump, which is particularly active in the {S}outhern {O}cean as well as in areas naturally enriched in iron, such as around the {K}erguelen {P}lateau. {T}his study evaluates the factors controlling the biogeochemical cycle of {S}i and its dynamics in this area and how it is impacted by the island mass effect using the {S}i isotopic signatures of both dissolved and biogenic {S}i. {W}hile subsurface winter waters have similar delta {S}i-30 signatures and dissolved {S}i concentrations, surface delta {S}i-30 and dissolved {S}i values are different between stations. {W}e show that this results from both (i) a different degree of dissolved {S}i utilization by silicifiers from winter water as the main {S}i source and (ii) an additional significant {S}i source to dissolved {S}i in the mixed layer from lithogenic {S}i dissolution for areas under the influence of the shelf. {I}ndeed, the delta {S}i-30({DS}i) signatures near the islands are homogeneous and lighter by -0.33 parts per thousand +/- 0.07 parts per thousand in the mixed layer compared to the outside plateau station. {W}e estimate such lithogenic {S}i contribution to dissolved {S}i at 2.9 +/- 1.8 mu mol {L}-1 for a corresponding specific flux of 3.7 +/- 2.3 x 10(6) mol km(-2) yr(-1) in shallow areas around {H}eard and {M}c{D}onald {I}slands (< 100 m). {T}his {S}i dissolution flux per surface area is among the highest in the ocean and has a traceable biogeochemical impact over the {N}orthern {K}erguelen {P}lateau. {I}t is likely due to the active volcanic nature of these islands combined with subglacial erosion on {H}eard.},
  keywords = {{OCEAN} {ANTARCTIQUE}},
  booktitle = {},
  journal = {{L}imnology and {O}ceanography},
  volume = {[{E}arly access]},
  numero = {},
  pages = {[14 p.]},
  ISSN = {0024-3590},
  year = {2025},
  DOI = {10.1002/lno.70243},
  URL = {https://www.documentation.ird.fr/hor/fdi:010095468},
}