A Micro-Macro Parareal Implementation for the Ocean-Circulation Model FESOM2

TL;DR

This paper applies a micro-macro Parareal algorithm to the FESOM2 ocean-circulation model, demonstrating convergence in complex climate simulations using refined meshes and interpolation methods.

Contribution

It introduces a novel micro-macro Parareal implementation for FESOM2, showing its potential for convergence in climate modeling with multi-resolution meshes.

Findings

Convergence achieved in diagnostic variables.

Refined mesh improves accuracy.

Method applicable to complex climate models.

Abstract

A micro-macro variant of the parallel-in-time algorithm Parareal has been applied to the ocean-circulation and sea-ice model model FESOM2. The state-of-the-art software in climate research has been developed by the Alfred-Wegener-Institut (AWI) in Bremen, Germany. The algorithm requires two meshes of low and high spatial resolution to define the coarse and fine propagator. As a first assessment we refined the PI mesh, increasing its resolution by factor 4. The main objective of this study was to demonstrate that micro-macro Parareal can provide convergence in diagnostic variables in complex climate research problems. After the introduction to FESOM2 we show how to generate the refined mesh and which interpolation methods were chosen. With the convergence results presented we discuss the success of this attempt and which steps have to be taken to extend the approach to current research problems.