TY - JOUR
T1 - The Time Scale of Shallow Convective Self‐Aggregation in Large‐Eddy Simulations Is Sensitive to Numerics
AU - Janssens, Martin
AU - Vilà‐Guerau de Arellano, Jordi
AU - Van Heerwaarden, Chiel C.
AU - Van Stratum, Bart J.H.
AU - De Roode, Stephan R.
AU - Siebesma, A.P.
AU - Glassmeier, Franziska
PY - 2023/1
Y1 - 2023/1
N2 - 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 (
AB - 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 (
U2 - 10.1029/2022MS003292
DO - 10.1029/2022MS003292
M3 - Article
SN - 1942-2466
VL - 15
SP - 1
EP - 18
JO - Journal of Advances in Modeling Earth Systems
JF - Journal of Advances in Modeling Earth Systems
IS - 1
ER -