The Time Scale of Shallow Convective Self‐Aggregation in Large‐Eddy Simulations Is Sensitive to Numerics

Autor:	Martin Janssens, Jordi Vilà‐Guerau de Arellano, Chiel C. vanHeerwaarden, Bart J. H. vanStratum, Stephan R. deRoode, A. Pier Siebesma, Franziska Glassmeier
Jazyk:	angličtina
Rok vydání:	2023
Předmět:	Physical geography GB3-5030 Oceanography GC1-1581
Zdroj:	Journal of Advances in Modeling Earth Systems, Vol 15, Iss 1, Pp n/a-n/a (2023)
Druh dokumentu:	article
ISSN:	1942-2466
DOI:	10.1029/2022MS003292
Popis:	Abstract Numerical simulations of the tropical mesoscales often exhibit a self‐reinforcing feedback between cumulus convection and shallow circulations, which leads to the self‐aggregation of clouds into large clusters. We investigate whether this basic feedback can be adequately captured by large‐eddy simulations (LESs). To do so, we simulate the non‐precipitating, cumulus‐topped boundary layer of the canonical “BOMEX” case over a range of numerical settings in two models. Since the energetic convective scales underpinning the self‐aggregation are only slightly larger than typical LES grid spacings, aggregation timescales do not converge even at rather high resolutions (
Databáze:	Directory of Open Access Journals
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