@article{fdi:010088444,
  title = {{A} comparison between water circulation and terrestrially-driven dissolved silica fluxes to the {M}editerranean {S}ea traced using radium isotopes},
  author = {{T}amborski, {J}. and {B}ejannin, {S}. and {G}arcia-{O}rellana, {J}. and {S}ouhaut, {M}. and {C}harbonnier, {C}. and {A}nschutz, {P}. and {P}ujo-{P}ay, {M}. and {C}onan, {P}. and {C}rispi, {O}. and {M}onnin, {C}. and {S}tieglitz, {T}homas and {R}odellas, {V}. and {A}ndrisoa, {A}. and {C}laude, {C}. and {V}an {B}eek, {P}.},
  editor = {},
  language = {{ENG}},
  abstract = {{T}he circulation of seawater through permeable coastal sediments is increasingly recognized as an important source of nutrients, including dissolved silica ({DS}i), to the coastal ocean. {H}ere, we utilized a {R}a isotope ({R}a-223, {R}a-224(ex), {R}a-228) mass balance to quantify {DS}i fluxes driven by water circulation to a small shallow coastal lagoon ({L}a {P}alme; {F}rench {M}editerranean) during {J}une 2016, as compared to karstic groundwater spring inputs. {T}he {DS}i flux driven by lagoon water circulation (derived from {R}a-224(ex)) was approximately one order of magnitude greater (1900 +/- 1700 mol d(-1)) than the {DS}i load of the karstic groundwater spring (250 +/- 50 mol d(-1)) and greater than molecular diffusion (970 +/- 750 mol d(-1)). {L}agoon water circulation was a negligible source of {R}a-228, indicating that circulation-driven {DS}i inputs occur over a time-scale of days. {O}ffshore transects were studied to quantify fluxes of marine-derived submarine groundwater discharge ({SGD}) from the permeable sandy coastline adjacent to the lagoon, into the {M}editerranean {S}ea. {S}urface water transects revealed near-shore enrichments of {R}a and {DS}i, attributed to wave-setup and water exchange through the permeable beach between the lagoon and the sea. {U}pscaling over the 9.5 km stretch of sandy beaches results in a marine {SGD}-driven {DS}i flux of 2.3 +/- 1.3 x 10(4) mol d(-1), similar in magnitude to the {T}et river during {N}ovember 2016 (3.3 +/- 2.4 x 10(4) mol d(-1)), the largest river in the region. e. {A} positive relationship between {DS}i and {R}a-224(ex) in lagoon water and seawater, but not {R}a-228, suggests that {R}a-224(ex) and {DS}i enrichments are derived from a similar source, the sediment (i.e. lithogenic particle dissolution), operating on short timescales. {A} marine {SGD}-driven {DS}i flux to the {G}ulf of {L}ions (3.8 +/- 2.2 x 10(5) mol d(-1)) is likely continuous over time. {T}he relatively constant {DS}i inputs from water circulation for the shallow lagoons and beaches along the {F}rench {M}editerranean {S}ea may sustain primary production in the coastal zone. {I}n comparison, terrestrial groundwater and rivers supply temporally vari able nutrient ({N}, {P}, {S}i) inputs via changes in regional precipitation, runoff and aquifer storage.},
  keywords = {{FRANCE} ; {MEDITERRANEE}},
  booktitle = {},
  journal = {{G}eochimica et {C}osmochimica {A}cta},
  volume = {238},
  numero = {},
  pages = {496--515},
  ISSN = {0016-7037},
  year = {2018},
  DOI = { 10.1016/j.gca.2018.07.022},
  URL = {https://www.documentation.ird.fr/hor/fdi:010088444},
}