@article{fdi:010088163,
  title = {{I}ncreasing riverine export of dissolved organic carbon from {C}hina},
  author = {{Y}an, {Y}. {Z}. and {L}auerwald, {R}. and {W}ang, {X}. {H}. and {R}egnier, {P}. and {C}iais, {P}. and {R}an, {L}. {S}. and {G}ao, {Y}. {Y}. and {H}uang, {L}. and {Z}hang, {Y}. and {D}uan, {Z}. and {P}apa, {F}abrice and {Y}u, {B}. and {P}iao, {S}. {L}.},
  editor = {},
  language = {{ENG}},
  abstract = {{R}iver transport of dissolved organic carbon ({DOC}) to the ocean is a crucial but poorly quantified regional carbon cycle component. {L}arge uncertainties remaining on the riverine {DOC} export from {C}hina, as well as its trend and drivers of change, have challenged the reconciliation between atmosphere-based and land-based estimates of {C}hina's land carbon sink. {H}ere, we harmonized a large database of riverine in-situ measurements and applied a random forest model, to quantify riverine {DOC} fluxes ({F}-{DOC}) and {DOC} concentrations ({C}-{DOC}) in rivers across {C}hina. {T}his study proposes the first {DOC} modeling effort capable of reproducing well the magnitude of riverine {C}-{DOC} and {F}-{DOC}, as well as its trends, on a monthly scale and with a much wider spatial distribution over {C}hina compared to previous studies that mainly focused on annual-scale estimates and large rivers. {R}esults show that over the period 2001-2015, the average {C}-{DOC} was 2.25 +/- 0.45 mg/{L} and average {F}-{DOC} was 4.04 +/- 1.02 {T}g/year. {S}imultaneously, we found a significant increase in {F}-{DOC} (+0.044 {T}g/year(2), p = .01), but little change in {C}-{DOC} (-0.001 mg/{L}/year, p > .10). {A}lthough the trend in {C}-{DOC} is not significant at the country scale, it is significantly increasing in the {Y}angtze {R}iver {B}asin and {H}uaihe {R}iver {B}asin (0.005 and 0.013 mg/{L}/year, p < .05) while significantly decreasing in the {Y}ellow {R}iver {B}asin and {S}outhwest {R}ivers {B}asin (-0.043 and -0.014 mg/{L}/year, p = .01). {C}hanges in hydrology, play a stronger role than direct impacts of anthropogenic activities in determining the spatio-temporal variability of {F}-{DOC} and {C}-{DOC} across {C}hina. {H}owever, and in contrast with other basins, the significant increase in {C}-{DOC} in the {Y}angtze {R}iver {B}asin and {H}uaihe {R}iver {B}asin is attributable to direct anthropogenic activities. {G}iven the dominance of hydrology in driving {F}-{DOC}, the increase in {F}-{DOC} is likely to continue under the projected increase in river discharge over {C}hina resulting from a future wetter climate.},
  keywords = {{C}hina ; climate change ; dissolved organic carbon ; land cover ; machine ; learning method ; net primary production ; river chemistry ; soil organic carbon ; {CHINE}},
  booktitle = {},
  journal = {{G}lobal {C}hange {B}iology},
  volume = {[{E}arly access]},
  numero = {},
  pages = {[19 p.]},
  ISSN = {1354-1013},
  year = {2023},
  DOI = {10.1111/gcb.16819},
  URL = {https://www.documentation.ird.fr/hor/fdi:010088163},
}