@article{fdi:010062385,
  title = {{C}lustering mesoscale convective systems with laser-based water vapor delta {O}-18 monitoring in {N}iamey ({N}iger)},
  author = {{T}remoy, {G}. and {V}imeux, {F}ran{\c{c}}oise and {S}oumana, {S}. and {S}ouley, {I}. and {R}isi, {C}. and {F}avreau, {G}uillaume and {O}i, {M}onique},
  editor = {},
  language = {{ENG}},
  abstract = {{T}he isotopic composition of surface water vapor (delta(v)) has been measured continuously in {N}iamey along with the isotopic composition of event-based precipitation (delta(p)) since 2010. {W}e investigate the evolution of water vapor and precipitation isotope ratios during rain events of the 2010, 2011, and 2012 monsoon periods. {W}e establish a classification of rain systems into three types based on the delta(v) temporal evolution. {W}e find that 51% of rain events (class {A}) exhibit a sharp decrease in delta {O}-18(v) in phase with the surface air temperature drop, leading to a depletion of water vapor by - 1.9% on average during rainfall. {T}wenty-nine percent of rain events (class {B}) show a similar decrease in delta {O}-18(v) in phase with the temperature drop but are characterized by a progressive enrichment of the vapor in the stratiform region, resulting in a depletion of water vapor by -1.2% on average during rainfall. {T}he last 20% of the rain events (class {C}) are associated with a progressive increase in delta {O}-18(v) during rainfall (+0.8%). {W}e also examine the temporal evolution of water vapor deuterium excess (d(v)) which shows a sharp increase as delta {O}-18(v) decreases, followed by a progressive decrease in the stratiform part for classes {A} and {B}. {U}sing a basic box model, we examine for each class the respective roles that mesoscale subsidence and rain evaporation play on the evolution of delta {O}-18(v). {W}e show that those two processes are dominant for class {A}, whereas other processes may exert a major role on delta {O}-18(v) for classes {B} and {C}.},
  keywords = {{NIGER}},
  booktitle = {},
  journal = {{J}ournal of {G}eophysical {R}esearch.{A}tmospheres},
  volume = {119},
  numero = {9},
  pages = {5079--5103},
  ISSN = {2169-897{X}},
  year = {2014},
  DOI = {10.1002/2013jd020968},
  URL = {https://www.documentation.ird.fr/hor/fdi:010062385},
}