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River to ocean models interpolation

Abstract : In CNRM-CM6-1 (Voldoire et al., 2019), the method used to interpolate river discharges simulated by the river routing CTRIP model to the NEMO ocean model is not conservative locally. This document explains the reasons of non-local conservation and proposes a new interpolation method that ensures local conservation. The consequences of this new interpolation are assessed in long term piControl type simulations in which forcing are fixed to preindustrial levels. In these simulations, we observe a strong impact on sea-ice extent and volume in both hemispheres. This in turn impacts the large-scale ocean mass transport (AMOC and ACC). Nevertheless, the resulting Arctic sea-ice extent is unrealistically large and it raises the need to tune the model ones the new interpolation method is included. More investigations would require such a tuning to be done. The new interpolation method can be applied to any other models given that the models ocean and river grids are dealt with in the OASIS coupler. This interpolation method could also be used for other quantities: biogenic fluxes, calving, etc. To this aim, it will be made available directly in OASIS future versions.
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https://hal-meteofrance.archives-ouvertes.fr/meteo-02986574
Contributor : Aurore Voldoire <>
Submitted on : Tuesday, November 3, 2020 - 10:06:37 AM
Last modification on : Thursday, November 5, 2020 - 3:28:12 AM

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interpolation_runoffs_en.pdf
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Aurore Voldoire. River to ocean models interpolation. [Research Report] CNRM, Université de Toulouse, Météo-France, CNRS. 2020. ⟨meteo-02986574⟩

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