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A global sensitivity analysis approach for marine biogeochemical modeling

Clémentine Prieur 1 Laurence Viry 1 Eric Blayo 1 Jean-Michel Brankart 2 
1 AIRSEA - Mathematics and computing applied to oceanic and atmospheric flows
Inria Grenoble - Rhône-Alpes, Grenoble INP - Institut polytechnique de Grenoble - Grenoble Institute of Technology, UGA [2016-2019] - Université Grenoble Alpes [2016-2019], LJK - Laboratoire Jean Kuntzmann
Abstract : This paper introduces the Sobol’ indices approach for global sensitivity analysis (SA), in the context of marine biogeochemistry. Such an approach is particularly well suited for ocean biogeochemical models, which make use of numerous parameters within large sets of differential equations with complex dependencies. This SA allows for a detailed study of the relative influence of a large number of input parameters on output quantities of interest to be chosen. It is able to distinguish between direct effects of these parameters and effects due to interaction between two or more parameters. Although demanding in terms of computation, such a tool is now becoming affordable, thanks to the development of distributed computing environments. An applicative example is presented with the MODECOGeL biogeochemical model, and illustrates the advantages of this approach over standard local SA.
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Submitted on : Tuesday, December 17, 2019 - 3:18:42 PM
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Clémentine Prieur, Laurence Viry, Eric Blayo, Jean-Michel Brankart. A global sensitivity analysis approach for marine biogeochemical modeling. Ocean Modelling, Elsevier, 2019, 139 (101402), pp.1-38. ⟨10.1016/j.ocemod.2019.101402⟩. ⟨hal-01952797v2⟩



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