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UID:submissions.pasc-conference.org_PASC23_sess135_msa132@linklings.com
SUMMARY:Ocean-Atmosphere Coupling in Earth System Models: Formulation and 
 Algorithms
DESCRIPTION:Minisymposium\n\nFlorian Lemarié (INRIA, Université Grenoble A
 lpes); Eric Blayo (Université Grenoble Alpes); Valentina Schüller (Technic
 al University of Munich, Université Grenoble Alpes); and Olivier Marti (La
 boratoire des Sciences du Climat et de l’Environnement)\n\nIn this talk, w
 e address the ocean-atmosphere coupling problem from the point of view of 
 domain decomposition methods. We show that present coupling methods used i
 n realistic ocean-atmosphere coupled models can be written in the formalis
 m of Schwarz iterative algorithms, and correspond to methods that are not 
 pushed to convergence, which may lead to imperfect coupling. We discuss th
 e objective of achieving a mathematically and physically consistent ocean-
 atmosphere coupling and we show that using improved coupling algorithms (l
 ike Schwarz methods) can impact the solution of a realistic climate model 
 (IPSL-CM) quite significantly (Marti et al., 2021). In particular it is sh
 own that traditional "parallel" coupling algorithm used in IPSL-CM can hav
 e large error after sunrise and before sunset, which means that there is r
 oom for improvement in the representation of the diurnal cycle. This error
  is significantly reduced when using a sequential algorithm but at the exp
 anse of a loss of parallelism. Those findings are confirmed and substantia
 ted in a simplified context using the single-column version of EC-Earth wh
 ich allows to focus on the role of parametrizations in the coupling. Final
 ly, we conclude by summarizing some challenges in the numerical formulatio
 n of climate models.\n\nDomain: Climate, Weather and Earth Sciences\n\nSes
 sion Chair: Vijay Mahadevan (Argonne National Laboratory, TechTrans Intern
 ational Inc)
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