@article{fdi:010090328,
  title = {{A}ssessing fluvial organic carbon flux and its response to short climate variability and damming on a large-scale tropical {A}sian river basin},
  author = {{F}abre, {C}l{\'e}ment and {W}ei, {X}. and {S}auvage, {S}. and {L}e, {T}. {P}. {Q}. and {O}uillon, {S}ylvain and {O}range, {D}idier and {H}errmann, {M}arine and {S}ánchez-{P}{\'e}reza, {J}. {M}.},
  editor = {},
  language = {{ENG}},
  abstract = {{F}luvial organic carbon ({OC}) transfer is an essential resource for downstream ecosystems. {M}ultiple factors affect its transfer process, e.g., climate or anthropogenic activities. {Q}uantifying {OC} fluxes with fine spatiotemporal resolution is challenging in anthropised catchments. {T}his study aims to quantify daily {OC} dynamics and to assess the impacts of short climate variability and damming on {OC} spatiotemporal transfer processes in a large tropical {A}sian river basin (the {R}ed {R}iver) for an extended period (2003-2013) by combining empirical equations with modelling outputs. {F}irstly, empirical equations for calculating dissolved ({DOC}) and particulate {OC} ({POC}) concentrations were calibrated based on in-situ sampling data. {T}hen, simulated daily discharge ({Q}) and suspended sediment concentrations were used to quantify daily {OC} fluxes. {R}esults show that the parameters of the {DOC} and {POC} equations well represent the subbasins characteristics, underlining the effects of soil {OC} content, mean annual {Q} and {C}hlorophyll a. {DOC} and {POC} exports reached 222 and 406 kt yr(-1) at the basin outlet, accounting for 0.38 % of the total {OC} ({TOC}) exported by {A}sian rivers to the ocean. {H}owever, the specific yields of {DOC} (1.62 t km(-2) yr(-1)) and {POC} (2.96 t km(-2) yr(-1)) of the {R}ed {R}iver basin were similar to 1.5 times those of other {A}sian basins. {B}y comparing a reference scenario (without dams) to current conditions, we estimated 12 % and 88 % decreases in {DOC} and {POC} fluxes between 2008-2013 and 2003-2007, mainly due to damming. {T}his study shows that climate variability may not impact {OC} dynamics in rivers as it explained <2 % of the variations. {H}owever, dam management, especially recent ones operating since 2008, deeply influences {OC} variations as the {POC}/{TOC} ratio decreased from 86 % to 47 %. {D}amming significantly decreased {POC} exports due to sediment retention, altering the equilibrium of {OC} cycling downstream, which may impact the food chain.},
  keywords = {{O}rganic carbon ; {S}hort climate variability ; {D}am ; {M}odelling ; {R}ed {R}iver ; {CHINE} ; {LAOS} ; {VIET} {NAM}},
  booktitle = {},
  journal = {{S}cience of the {T}otal {E}nvironment},
  volume = {903},
  numero = {},
  pages = {166589 [19 p.]},
  ISSN = {0048-9697},
  year = {2023},
  DOI = {10.1016/j.scitotenv.2023.166589},
  URL = {https://www.documentation.ird.fr/hor/fdi:010090328},
}