@article{fdi:010044298,
  title = {{B}enthic remineralization at the land-ocean interface : a case study of the {R}hone {R}iver ({NW} {M}editerranean {S}ea)},
  author = {{L}ansard, {B}. and {R}abouille, {C}. and {D}enis, {L}. and {G}renz, {C}hristian},
  editor = {},
  language = {{ENG}},
  abstract = {{B}iogeochemical processes in sediments under the influence of the {R}hone {R}iver plume were studied using both in situ microelectrodes and ex situ sediment core incubations. {O}rganic carbon ({OC}) and total nitrogen ({TN}) content as well as stable carbon isotopic composition of {OC} (delta {C}-13({OC})) were analysed in 19 surface sediments to determine the distribution and sources of organic matter in the {R}hone delta system. {L}arge spatial variations were observed in both the total {O}-2 uptake (5.2 to 29.3 mmol m(-2) d(-1)) and {NH}4+ release (-0.1 to -3.5 mmol m(-2) d(-1)) rates at the sediment-water interface. {T}he highest fluxes were measured near the {R}hone {R}iver mouth where sedimentary {OC} and {TN} contents reached 1.81% and 0.23% respectively. {V}alues of delta {C}-13({OC}) ranged from -26.83 parts per thousand to -23.88 parts per thousand with a significant seawards enrichment tracing the dispersal of terrestrial organic matter on the continental shelf {T}he amount of terrestrial-derived {OC} reaches 85% in sediments close to the {R}hone mouth decreasing down to 25% in continental shelf sediments. {O}n the prodelta, high terrestrial {OC} accumulation rates support high oxygen uptake rates and thus indicating that a significant fraction of terrestrial {OC} is remineralized. {A} particulate organic carbon ({POC}) mass balance indicates that only 3% of the deposited {POC} is remineralized in prodelta sediments while 96% is recycled on the continental shelf. {I}t was calculated that a large proportion of the {R}hone {POC} input is either buried (similar to 52%) or remineralized (similar to 8%), mostly on the prodelta area. {T}he remaining fraction (similar to 40%) is either mineralized in the water or exported outside the {R}hone delta system in dissolved or particulate forms.},
  keywords = {organic carbon recycling ; coastal sediment ; in situ oxygen uptake rate ; stable carbon isotopes ; {R}hone {R}iver ; {G}ulf of {L}ions},
  booktitle = {},
  journal = {{E}stuarine {C}oastal and {S}helf {S}cience},
  volume = {81},
  numero = {4},
  pages = {544--554},
  ISSN = {0272-7714},
  year = {2009},
  DOI = {10.1016/j.ecss.2008.11.025},
  URL = {https://www.documentation.ird.fr/hor/fdi:010044298},
}