@article{fdi:010090552,
  title = {{A}brupt excursions in water vapor isotopic variability at the {P}ointe {B}enedicte observatory on {A}msterdam {I}sland},
  author = {{L}andais, {A}. and {A}gosta, {C}. and {V}imeux, {F}ran{\c{c}}oise and {M}agand, {O}. and {S}olis, {C}. and {C}auquoin, {A}. and {D}utrievoz, {N}. and {R}isi, {C}. and {S}antos, {C}. {L}. {D}. and {F}ourr{\'e}, {E}. and {C}attani, {O}. and {J}ossoud, {O}. and {M}inster, {B}. and {P}ri{\'e}, {F}. and {C}asado, {M}. and {D}ommergue, {A}. and {B}ertrand, {Y}. and {W}erner, {M}.},
  editor = {},
  language = {{ENG}},
  abstract = {{I}n order to complement the picture of the atmospheric water cycle in the {S}outhern {O}cean, we have continuously monitored water vapor isotopes since {J}anuary 2020 on {A}msterdam {I}sland in the {I}ndian {O}cean. {W}e present here the first 2-year long water vapor isotopic record at this site. {W}e show that the water vapor isotopic composition largely follows the water vapor mixing ratio, as expected in marine boundary layers. {H}owever, we detect 11 periods of a few days where there is a strong loss of correlation between water vapor delta 18 {O} and water vapor mixing ratio as well as abrupt negative excursions of water vapor delta 18 {O} . {T}hese excursions often occur toward the end of precipitation events. {S}ix of these events show a decrease in gaseous elemental mercury, suggesting subsidence of air from a higher altitude.{O}ur study aims to further explore the mechanism driving these negative excursions in water vapor delta 18 {O} . {W}e used two different models to provide a data-model comparison over this 2-year period. {W}hile the {E}uropean {C}entre {H}amburg model ({ECHAM}6-wiso) at 0.9 degrees was able to reproduce most of the sharp negative water vapor delta 18 {O} excursions, hence validating the physics process and isotopic implementation in this model, the {L}aboratoire de {M}eteorologie {D}ynamique {Z}oom model ({LMDZ}-iso) at 2 degrees (3 degrees) resolution was only able to reproduce seven (one) of the negative excursions, highlighting the possible influence of the model resolution for the study of such abrupt isotopic events. {B}ased on our detailed model-data comparison, we conclude that the most plausible explanations for such isotopic excursions are rain-vapor interactions associated with subsidence at the rear of a precipitation event.},
  keywords = {{OCEAN} {INDIEN} ; {TAAF}},
  booktitle = {},
  journal = {{A}tmospheric {C}hemistry and {P}hysics},
  volume = {24},
  numero = {8},
  pages = {4611--4634},
  ISSN = {1680-7316},
  year = {2024},
  DOI = {10.5194/acp-24-4611-2024},
  URL = {https://www.documentation.ird.fr/hor/fdi:010090552},
}