Implementation of tritium in the General Circulation Model MIROC to investigate the dynamics of the hydrological cycle

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General circulation models (GCMs) are used to study the Earth's climate system and project its future changes. However, the representation of the water cycle in these models remains a challenge. So, this project provides the incorporation of the tracer tritium into the MIROC Earth system model to improve the modeling of the hydrological cycle. Tritium is a very valuable tracer of the water cycle because it is a strong marker of the involved reservoirs such as the stratosphere, the troposphere and the oceans.This tracer has been successfully implemented in the isotopic version of the atmospheric GCM MIROC5, MIROC5-iso. Next, I used for the first time the natural tritium production modulated by solar activity to run a simulation over the period 1979-2018 to study the impact of solar activity on the water cycle and climate.Anthropogenic tritium production by nuclear bombs in the 1960s is coded and will be tested very soon.This work will be presented in July 2023 at the Hydrology Symposium of the IAEA in Vienna, Austria.