Water Stable Isotope Composition of Precipitations at Two Stations in Antananarivo-Madagascar: A Comparative Study

In the “Global Network of Isotopes in Precipitation” database, Antananarivo has two distinct datasets from stations. Thirty-four years separate datasets. This study aims on one hand to depict variations water stable isotopes composition precipitations stations and understand their origins, mainly relation meteorological factors. On other hand, data are compared with regional international identify sources isotope variability precipitation. Isotope records showed that after thirty-four-year gap, summer winter (the main seasons) more enriched heavy isotopes. The precipitation amount fluctuation would mostly contribute this temporal variation. Opposite precipitations, inter-season rainfalls have similar values thirty-four years. geographically close spatial aspect is therefore negligible since there no latitude nor altitude effects precipitations. Regarding second order parameter d-excess, monthly mean both higher than 100/00 could indicate moisture recycling. comparison regional/international primarily due effect, different source, distance it change factors along trajectory.