@article{fdi:010065648,
  title = {{S}easonal variations, origin, and fate of settling diatoms in the {S}outhern {O}cean tracked by silicon isotope records in deep sediment traps},
  author = {{C}losset, {I}. and {C}ardinal, {D}. and {B}ray, {S}. {G}. and {T}hil, {F}. and {D}jouraev, {I}rina and {R}igual-{H}ernandez, {A}. {S}. and {T}rull, {T}. {W}.},
  editor = {},
  language = {{ENG}},
  abstract = {{T}he {S}outhern {O}cean plays a pivotal role in the control of atmospheric {CO}2 levels, via both physical and biological sequestration processes. {T}he biological carbon transfer to the ocean interior is tightly coupled to the availability of other elements, especially iron as a trace-limiting nutrient and dissolved silicon as the mineral substrate that allows diatoms to dominate primary production. {I}mportantly, variations in the silicon cycling are large but not well understood. {H}ere we use {S}i-30 measurements to track seasonal flows of silica to the deep sea, as captured by sediment trap time series, for the three major zones ({A}ntarctic, {AZ}; {P}olar {F}rontal, {PFZ}; and {S}ub-{A}ntarctic, {SAZ}) of the open {S}outhern {O}cean. {V}ariations in the exported flux of biogenic silica ({BS}i) and its {S}i-30 composition reveal a range of insights, including that (i) the sinking rate of {BS}i exceeds 200md(-1) in summer in the {AZ} yet decreases to very low values in winter that allow particles to remain in the water column through to the following spring, (ii) occasional vertical mixing events affect the {S}i-30 composition of exported {BS}i in both the {SAZ} and {AZ}, and (iii) the {S}i-30 signature of diatoms is well conserved through the water column despite strong {BS}i and particulate organic carbon ({POC}) attenuation at depth and is closely linked to the {S}i consumption in surface waters. {W}ith the strong coupling observed between {BS}i and {POC} fluxes in {PFZ} and {AZ}, these data provide new constraints for application to biogeochemical models of seasonal controls on production and export.},
  keywords = {silicon isotopes ; {S}outhern {O}cean ; {GEOTRACES} ; seasonal variations ; settling rates ; diatoms ; {OCEAN} {AUSTRAL}},
  booktitle = {},
  journal = {{G}lobal {B}iogeochemical {C}ycles},
  volume = {29},
  numero = {9},
  pages = {1495--1510},
  ISSN = {0886-6236},
  year = {2015},
  DOI = {10.1002/2015gb005180},
  URL = {https://www.documentation.ird.fr/hor/fdi:010065648},
}