Formulation of a three-dimensional atmospheric boundary layer model for an improved representation of air-sea interactions in eddying oceanic models

Florian Lemarié (1)

1 AIRSEA - Mathematics and computing applied to oceanic and atmospheric flows

In this document, we derive a three-dimensional extension of the single-column atmospheric boundary layer (ABL1d) model derived in Lemari ́e et al. (2021). The idea is to formulate the ABL3d model in terms of perturbation around a large-scale ambient state obtained from analyses or reanalyses. The proposed formulation is both simple and efficient from the computational point of view. Using numerical experiments and comparison with LES simulations, we illustrate the improvement brought by ABL3d compared with ABL1d. The ABL1d approach was designed to represent the modulation of the atmospheric boundary layer by sea-surface anomalies. The ABL3d model has the same ability, but it can also represent horizontal advection and the adjustment of the atmospheric horizontal pressure gradient to sea surface temperature anomalies.

Mots clés: Ocean-atmosphere interaction; Multiscale Analysis; Fine-scale ocean circulation model

Domaines: Océan, Atmosphère

Florian Lemarié. Formulation of a three-dimensional atmospheric boundary layer model for an improved representation of air-sea interactions in eddying oceanic models. 2024. ⟨hal-04563051⟩