@article{fdi:010071408,
  title = {{T}he isotopic composition of near-surface water vapor at the {M}aido observatory ({R}eunion {I}sland, southwestern {I}ndian {O}cean) documents the controls of the humidity of the subtropical troposphere},
  author = {{G}uilpart, {E}. and {V}imeux, {F}ran{\c{c}}oise and {E}van, {S}. and {B}rioude, {J}. and {M}etzger, {J}. {M}. and {B}arthe, {C}. and {R}isi, {C}. and {C}attani, {O}.},
  editor = {},
  language = {{ENG}},
  abstract = {{W}e present a 1 year long record of the isotopic composition of near-surface water vapor (delta {O}-18(v)) at the {M}aido atmospheric observatory ({R}eunion {I}sland, {I}ndian {O}cean, 22 degrees {S}, 55 degrees {E}) from 1 {N}ovember 2014 to 31 {O}ctober 2015, using wavelength-scanned cavity ring down spectroscopy. {E}xcept during cyclone periods where delta {O}-18(v) is highly depleted (-20.5%), a significant diurnal variability can be seen on both delta {O}-18(v) and q(v) with enriched (depleted) water vapor (mean delta {O}-18(v) is -13.4% (-16.6%)) and moist (dry) conditions (mean q(v) is 9.7 g/kg (6.4 g/kg)) during daytime (nighttime). {W}e show that d18{O}v diurnal cycle arises from mixing processes for 65% of cases with two distinct sources of water vapor. {W}e suggest that delta {O}-18(v) diurnal cycle is controlled by an interplay of thermally driven land-sea breezes and upslope-downslope flows, bringing maritime air to the observatory during daytime, whereas at night, the observatory is above the atmospheric boundary layer and samples free tropospheric air. {I}nterestingly, delta {O}-18(v) record also shows that some nights (15%) are extremely depleted (mean delta {O}-18(v) is -21.4%). {T}hey are among the driest of the record (mean q(v) is 2.9 g/kg). {B}ased on different modeling studies, we suggest that extreme nocturnal isotopic depletions are caused by large-scale atmospheric transport and subsidence of dry air masses from the upper troposphere to the surface, induced by the subtropical westerly jet.},
  keywords = {{REUNION} ; {OCEAN} {INDIEN} ; {MAIDO} {MONT} ; {ZONE} {SUBTROPICALE}},
  booktitle = {},
  journal = {{J}ournal of {G}eophysical {R}esearch : {A}tmospheres},
  volume = {122},
  numero = {18},
  pages = {9628--9650},
  ISSN = {2169-897{X}},
  year = {2017},
  DOI = {10.1002/2017jd026791},
  URL = {https://www.documentation.ird.fr/hor/fdi:010071408},
}