The Model of Oceanic and Marine Circulation Inmom: From Origins to the Present Day

The history is described of the Russian sigma-model of oceanic and marine circulation known as INMOM (Institute of Numerical Mathematics Ocean Model). The model was developed for 50 years initially at KCC SB AS USSR, then at INM RAS. The first version of the model was developed under immediate supervision of G.I. Marchuk and was designed for modelling of coupled circulation of global atmosphere and World Ocean. The main method for solving model equations was the multicomponent splitting technique proposed by G.I. Marchuk and evolved by his students and followers. For a half of century, the model’s representation of basic processes, parameterizations and numerical algorithms were improved. The novel period in the model development proceeded in the late 90’s, when it started to be used as the oceanic component of the INM RAS Earth system model. In 2000’s, the range of its application extended essentially. Together with studying Earth climate system, it started to be implemented for simulating circulation of the World Ocean, as well as its separate basins and seas. Currently, the model INMOM is being applied for solving a wide range of fundamental and applied problems concerned with reproducing characteristics of marine and oceanic hydrothermodynamics including their climatic variability. It is used at INM RAS, SOI, IO RAS, Hydrometcenter of Russia, POI FEB RAS and more organizations dealing with study of oceanic and marine hydrothermodynamics. The model is continuing to be evolved by its authors, their colleagues and followers.