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A simplified atmospheric boundary layer model for an improved representation of air–sea interactions in eddying oceanic models: implementation and first evaluation in NEMO (4.0) ArchiMer
Lemarié, Florian; Samson, Guillaume; Redelsperger, Jean-luc; Giordani, Hervé; Brivoal, Théo; Madec, Gurvan.
A simplified model of the atmospheric boundary layer (ABL) of intermediate complexity between a bulk parameterization and a three-dimensional atmospheric model is developed and integrated to the Nucleus for European Modelling of the Ocean (NEMO) general circulation model. An objective in the derivation of such a simplified model, called ABL1d, is to reach an apt representation in ocean-only numerical simulations of some of the key processes associated with air–sea interactions at the characteristic scales of the oceanic mesoscale. In this paper we describe the formulation of the ABL1d model and the strategy to constrain this model with large-scale atmospheric data available from reanalysis or real-time forecasts. A particular emphasis is on the appropriate...
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Ano: 2021 URL: https://archimer.ifremer.fr/doc/00679/79085/81536.pdf
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Development of a 2-way coupled ocean-wave model: assessment on aglobal NEMO(v3.6)-WW3(v6.02) coupled configuration ArchiMer
Couvelard, Xavier; Lemarié, Florian; Samson, Guillaume; Redelsperger, Jean-luc; Ardhuin, Fabrice; Benshila, Rachid; Madec, Gurvan.
This paper describes the implementation of a coupling between a three-dimensional ocean general circulation model (NEMO) and a wave model (WW3) to represent the interactions of the upper oceanic flow dynamics with surface waves. The focus is on the impact of such coupling on upper-ocean properties (temperature and currents) and mixed-layer depths (MLD) at global eddying scales. A generic coupling interface has been developed and the NEMO governing equations and boundary conditions have been adapted to include wave-induced terms following the approach of McWilliams et al. (2004) and Ardhuin et al. (2008). In particular, the contributions of Stokes-Coriolis, Vortex and surface pressure forces have been implemented on top of the necessary modifications of the...
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Ano: 2019 URL: https://archimer.ifremer.fr/doc/00512/62338/66599.pdf
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Impact of ocean-atmosphere current feedback on the ocean mesoscale activity: regional variations, and sensitivity to model resolution ArchiMer
Jullien, Swen; Masson, Sébastien; Oerder, Véra; Samson, Guillaume; Colas, François; Renault, Lionel.
Ocean mesoscale eddies are characterized by rotating-like and meandering currents that imprint the low-level atmosphere. Such a current feedback (CFB) has been shown to induce a sink of energy from the ocean to the atmosphere, and consequently to damp the eddy kinetic energy (EKE), with an apparent regional disparity. In a context of increasing model resolution, the importance of this feedback, and its dependence on oceanic and atmospheric models resolution arise. Using a hierarchy of quasi-global coupled models with spatial resolutions varying from ¼° to 1/12°, the present study shows that the CFB induces a negative wind work at scales ranging from 100 to 1000 km, and a subsequent damping of the mesoscale activity by ∼30% on average, independently of the...
Tipo: Text Palavras-chave: Currents; Feedback; Mesoscale processes; Air-sea interaction; Coupled models; Mesoscale models.
Ano: 2020 URL: https://archimer.ifremer.fr/doc/00601/71329/69759.pdf
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Roles of land surface albedo and horizontal resolution on the Indian summer monsoon biases in a coupled ocean–atmosphere tropical-channel model ArchiMer
Samson, Guillaume; Masson, Sebastien; Durand, Fabien; Terray, Pascal; Berthet, Sarah; Jullien, Swen.
The Indian summer monsoon (ISM) simulated over the 1989–2009 period with a new 0.75° ocean–atmosphere coupled tropical-channel model extending from 45°S to 45°N is presented. The model biases are comparable to those commonly found in coupled global climate models (CGCMs): the Findlater jet is too weak, precipitations are underestimated over India while they are overestimated over the southwestern Indian Ocean, South-East Asia and the Maritime Continent. The ISM onset is delayed by several weeks, an error which is also very common in current CGCMs. We show that land surface temperature errors are a major source of the ISM low-level circulation and rainfall biases in our model: a cold bias over the Middle-East (ME) region weakens the Findlater jet while a...
Tipo: Text Palavras-chave: Indian summer monsoon; Land surface albedo; Horizontal resolution; Precipitation biases; Monsoon onset; CGCM.
Ano: 2017 URL: http://archimer.ifremer.fr/doc/00334/44481/44275.pdf
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