@article{fdi:010080004,
  title = {{M}ulti-grid algorithm for passive tracer transport in the {NEMO} ocean circulation model : a case study with the {NEMO} {OGCM} (version 3.6)},
  author = {{B}ricaud, {C}. and {L}e {S}ommer, {J}. and {M}adec, {G}. and {C}alone, {C}. and {D}eshayes, {J}. and {E}the, {C}. and {C}hanut, {J}. and {L}evy, {M}arina},
  editor = {},
  language = {{ENG}},
  abstract = {{O}cean biogeochemical models are key tools for both scientific and operational applications. {N}evertheless the cost of these models is often expensive because of the large number of biogeochemical tracers. {T}his has motivated the development of multi-grid approaches where ocean dynamics and tracer transport are computed on grids of different spatial resolution. {H}owever, existing multi-grid approaches to tracer transport in ocean modelling do not allow the computation of ocean dynamics and tracer transport simultaneously. {T}his paper describes a new multi-grid approach developed for accelerating the computation of passive tracer transport in the {N}ucleus for {E}uropean {M}odelling of the {O}cean ({NEMO}) ocean circulation model. {I}n practice, passive tracer transport is computed at runtime on a grid with coarser spatial resolution than the hydrodynamics, which reduces the {CPU} cost of computing the evolution of tracers. {W}e describe the multi-grid algorithm, its practical implementation in the {NEMO} ocean model, and discuss its performance on the basis of a series of sensitivity experiments with global ocean model configurations. {O}ur experiments confirm that the spatial resolution of hydrodynamical fields can be coarsened by a factor of 3 in both horizontal directions without significantly affecting the resolved passive tracer fields. {O}verall, the proposed algorithm yields a reduction by a factor of 7 of the overhead associated with running a full biogeochemical model like {PISCES} (with 24 passive tracers). {P}ropositions for further reducing this cost without affecting the resolved solution are discussed.},
  keywords = {{MONDE}},
  booktitle = {},
  journal = {{G}eoscientific {M}odel {D}evelopment},
  volume = {13},
  numero = {11},
  pages = {5465--5483},
  ISSN = {1991-959{X}},
  year = {2020},
  URL = {https://www.documentation.ird.fr/hor/fdi:010080004},
}