@article{fdi:010052925,
  title = {{C}ombined measurements of {O}-17(excess) and d-excess in {A}frican monsoon precipitation : implications for evaluating convective parameterizations},
  author = {{L}andais, {A}. and {R}isi, {C}. and {B}ony, {S}. and {V}imeux, {F}ran{\c{c}}oise and {D}escroix, {L}uc and {F}alourd, {S}. and {B}ouygues, {A}.},
  editor = {},
  language = {{ENG}},
  abstract = {{W}ater stable isotopes (delta {O}-18, delta {D}) are useful tools to depict and to understand the atmospheric water cycle. {I}n tropical regions, they record the variations of convective activity and their implementation in convection schemes brings constraints on our understanding and parameterization of this phenomena. {H}ere, we present for the first time measurements of a new isotopic marker of the hydrological cycle ({O}-17(excess) resulting from the combination of delta {O}-17 and delta {O}-18 of water) in convective regions on two different time scales: (i) during the {A}frican monsoon onset and intra-seasonal variability ({B}anizoumbou, 2006) and (ii) during the squall line of the 11th of {A}ugust 2006 ({N}iamey). {O}-17(excess) responds to the monsoon onset by a similar to 30 per meg increase as well as to different convective processes in squall lines by similar to 20 per meg variations. {T}hese variations parallel those of d-excess at first order and display significant correlation with relative humidity in the lower troposphere. {S}till, higher correlation coefficients are observed between d-excess and relative humidity than between {O}-17(excess) and relative humidity, suggesting a higher influence of relative humidity on d-excess than on {O}-17(excess). {U}sing a simple reevaporation model and a more sophisticated 2{D} model of a squall line, we show that reevaporation is the process explaining the increase of d-excess and {O}-17(excess) with relative humidity for these two studies. {W}e also show that the combination of {O}-17(excess) and d-excess is a powerful tool to constrain the representation of isotopic processes during rain reevaporation. {I}n turn, a good representation of such processes enables to use water isotopes to evaluate convective parameterization in atmospheric models.},
  keywords = {water isotopes ; reevaporation ; convection ; {A}frican monsoon ; relative ; humidity},
  booktitle = {},
  journal = {{E}arth and {P}lanetary {S}cience {L}etters},
  volume = {298},
  numero = {1-2},
  pages = {104--112},
  ISSN = {0012-821{X}},
  year = {2010},
  DOI = {10.1016/j.epsl.2010.07.033},
  URL = {https://www.documentation.ird.fr/hor/fdi:010052925},
}