@article{fdi:010088264,
  title = {{W}ater budget of tropical volcanic lakes in center-north {C}ameroon : reconciling the stable isotope and chloride mass balance},
  author = {{A}bba, {S}. and {H}amelin, {B}. and {M}ichelot, {J}. {L}. and {G}arcin, {Y}annick and {D}eschamps, {P}ierre},
  editor = {},
  language = {{ENG}},
  abstract = {{T}he {C}ameroon volcanic line ({CVL}) hosts numerous volcanic lakes whose internal processes and hydrological functioning remain poorly documented. {A} detailed understanding of these hydro-systems is however essential, both for the consideration of these lakes as sentinels of the regional hydro-climatic changes and for the calibration of palaeoenvironmental proxies. {H}ere, we present a hydrological and geochemical investigation of five of these lakes ({M}balang, {T}abere, {T}izon, {G}egouba and {B}aledjam) around {N}gaoundere on the {A}damawa {P}lateau, based on repeated sampling of water profiles and monthly monitoring of rain and lake water samples over two seasonal cycles. {W}e show that each of these throughflow lakes bears a distinct geochemical and isotopic signature, despite quite similar morphometric characteristics and a common climatic regime, due to varying contribution of the watersheds to the water-mass balance and different partitioning between evaporation ({E}) and outflow ({I}nflow minus {E}). {W}e use these differences as a benchmark for a sensitivity analysis of the classical budget equations of conservative tracers. {T}he results demonstrate that to reconcile chloride and stable isotope data with the standard single-box steady state model would require unusual values of the physical parameters of {C}raig and {G}ordon's equation such as the n.theta term that would have to be significantly lower than its usual value (n.theta = 0.5). {W}e also show that the data can be simulated more easily by including the inflow from the watershed while assuming that transpiration exceeds evaporation for this compartment. {U}sing this conceptualization of the throughflow lakes, we were able to constrain the different fluxes. {T}ranspiration from the watershed and evaporation from the lake are on the same order of magnitude, or slightly in favour of transpiration. {W}hile providing evaporation and transpiration rates which are in general in the right order of magnitude, the system of equations remains underdetermined at this stage. {O}nly direct measurements of the isotopic composition of the atmosphere, possible by laser mass spectrometry, would allow to reduce the range of under-determination of this problem.},
  keywords = {{C}ameroon ; chloride ; stable isotopes ; volcanic lakes ; water budget ; {CAMEROUN}},
  booktitle = {},
  journal = {{H}ydrological {P}rocesses},
  volume = {37},
  numero = {6},
  pages = {e14923 [19 ]},
  ISSN = {0885-6087},
  year = {2023},
  DOI = {10.1002/hyp.14923},
  URL = {https://www.documentation.ird.fr/hor/fdi:010088264},
}