@article{fdi:010090799,
  title = {{C}hemical weathering and {CO}2 consumption in the upper {N}yong {B}asin rivers ({C}entral {A}frica) : insights on climatic and anthropogenic forcing in humid tropical environments},
  author = {{K}omba, {D}. {E}. and {N}lend, {B}. and {B}raun, {J}ean-{J}acques and {B}oum-{N}kot, {S}. {N}. and {A}udry, {S}. and {N}dondo, {G}. {R}. {N}. and {R}iotte, {J}ean and {N}nomo, {B}. {N}. and {N}tamak-{N}ida, {M}. {J}. and {E}tame, {J}. and {F}ongoh, {E}. {J}. and {B}essa, {H}. {A}. and {L}agane, {C}hristelle and {N}goupayou, {J}. {R}. {N}.},
  editor = {},
  language = {{ENG}},
  abstract = {{A} hydrological and hydrochemical database (produced by the {M}-{TROPICS} critical zone observatory) in the upper {N}yong {B}asin from 1998 to 2017 was used to evaluate the river's response to climatic and anthropogenic forcing and examine chemical weathering processes. {S}i{O}2 and {HCO}3- constitute about 85 % of the {T}otal dissolved solids ({TDS}) load, equivalent to 0.12 x 10(9) kg. y(-1). {E}lectrical conductivity ({EC}), {T}otal dissolved solids ({TDS}), major cations, major anions (except {F} and {NO}3-) and alkalinity ({A}lk) vary seasonally and follow a predictable model with discharge. {A}tlantic {M}eridional {M}ode oscillation controls the long-term water chemistry. {A}tmospheric input and silicate weathering are the main factors influencing the {N}yong rivers chemistry. {H}owever, several indices supported the progressive water quality deterioration by human activities, namely: the excess of {C}l- and {SO}42- after the substraction of atmospheric inputs, the basic p{H} observed for specific samples, long-term increase in the values of p{H}, {EC}, {TDS}, {EC}, {M}g2+, {C}a2+, {F}, {NO}3-, {HCO}3-, {A}lk, {S}i{O}2 and {D}issolved {O}rganic {C}arbon. {R}unoff and physical erosion have an important control on chemical erosion in the upper {N}yong {B}asin rivers. {T}he chemical erosion rate (3.3 t.km(-2).y(-1)) equals the silicate weathering rate. {T}he {CO}2 consumption rate, in the {N}yong rivers, is lower than the global average (98x 10(3) for silicate weathering and 246 x 10(3) mol.km(-2).y(-1) for chemical erosion) and estimated at 52.3 x 10(3) for silicate weathering and 54.1 x 10(3) mol.km(-2).y(-1) for chemical erosion. {A}t {O}lama, the most downstream location of the monitoring setup, the {N}yong {R}iver {B}asin consumed 1 x 10(9) mol. y(-1) of {CO}2 by chemical erosion.},
  keywords = {{T}ropical {R}iver ; {C}hemical weathering ; {CO}2 consumption ; {S}olute fluxes ; {A}nthropogenic forcing ; {AFRIQUE} {CENTRALE} ; {CAMEROUN} ; {ATLANTIQUE} ; {ZONE} {TROPICALE}},
  booktitle = {},
  journal = {{S}cience of the {T}otal {E}nvironment},
  volume = {937},
  numero = {},
  pages = {173405 [21 p.]},
  ISSN = {0048-9697},
  year = {2024},
  DOI = {10.1016/j.scitotenv.2024.173405},
  URL = {https://www.documentation.ird.fr/hor/fdi:010090799},
}