@article{fdi:010071309,
  title = {{S}ilicon cycle in {I}ndian estuaries and its control by biogeochemical and anthropogenic processes},
  author = {{M}angalaa, {K}. {R}. and {C}ardinal, {D}. and {B}rajard, {J}. and {R}ao, {D}. {B}. and {S}arma, {N}. {S}. and {D}jouraev, {I}rina and {C}hiranjeevulu, {G}. and {M}urty, {K}. {N}. and {S}arma, {V}. {V}. {S}. {S}.},
  editor = {},
  language = {{ENG}},
  abstract = {{W}e study the silicon biogeochemical cycle and its associated parameters in 24 and 18 {I}ndian estuaries during dry and wet periods respectively. {W}e focus more specifically on dissolved {S}i ({DS}i), amorphous {S}i ({AS}i,) lithogenic {S}i ({LS}i), {P}articulate {O}rganic {C}arbon ({POC}), {T}otal {S}uspended {M}aterial ({TSM}), {D}issolved {I}norganic {N}itrogen ({DIN}), salinity and fucoxanthin, a marker pigment for diatoms. {O}verall, we show that the estuaries have strong inter and intra variability of their biogeochemical parameters both seasonally and along salinity gradients. {B}ased on {P}rincipal {C}omponent {A}nalysis and clustering of categorised (upper and lower) estuaries, we discuss the four major processes controlling the {S}i variability of {I}ndian estuaries: 1) lithogenic supply, 2) diatom uptake, 3) mixing of sea water and, 4) land use. {T}he influence of lithogenic control is significantly higher during the wet period than during the dry period, due to a higher particle supply through monsoonal discharge. {A} significant diatom uptake is only identified in the estuaries during dry period. {B}y taking into account the non-conservative nature of {S}i and by extrapolating our results, we estimate the fluxes from the {I}ndian subcontinent of {DS}i, {AS}i, {LS}i to the {B}ay of {B}engal (211 +/- 32, 10 +/- 4.7, 2028 +/- 317 {G}mol) and {A}rabian {S}ea (80 +/- 15, 7 +/- 1.1, 1717 +/- 932 {G}mol). {W}e show the impact of land use in watersheds with higher levels of agricultural activity amplifies the supply of {S}i to the coastal {B}ay of {B}engal during the wet season. {I}n contrast, forest cover and steep slopes cause less {S}i supply to the {A}rabian {S}ea by restricting erosion when entering the estuary. {F}inally, {S}i:{N} ratios show that nitrogen is always in deficit relative to silicon for diatom growth, these high {S}i:{N} ratios likely contribute to the prevention of eutrophication in the {I}ndian estuaries and coastal sea.},
  keywords = {{A}morphous silica ; {W}eathering ; {D}iatoms ; {L}and use ; {M}onsoon ; {L}and-to-ocean continuum ; {INDE}},
  booktitle = {},
  journal = {{C}ontinental {S}helf {R}esearch},
  volume = {148},
  numero = {},
  pages = {64--88},
  ISSN = {0278-4343},
  year = {2017},
  DOI = {10.1016/j.csr.2017.08.011},
  URL = {https://www.documentation.ird.fr/hor/fdi:010071309},
}