A15: SHOC+MF scheme
- Maria Chinita
- Renata McCoy
Full Title | Improving the representation of shallow cumulus convection with the simplified-higher-order-closure–mass-flux (SHOC+MF) approach |
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First Author |
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All Authors | Joao Teixeira (JPL/UCLA) Mikael Witte (NPS/UCLA/JPL) Marcin Kurowski (JPL) Kay Suselj (UCLA) Georgios Matheou (UConn) Peter Bogenschutz (LLNL) |
Topic | Atmosphere |
Project | E3SM |
Abstract | Parameterized boundary layer turbulence and moist convection remain some of the largest sources of uncertainty in general circulation models. High-resolution climate modeling aims to reduce that uncertainty by explicitly attempting to resolve deep moist convective motions. An example of such a model is the Simple Cloud-Resolving E3SM Atmosphere Model (SCREAM) with a target global resolution of 3.25 km, allowing for a more accurate representation of complex mesoscale deep convective dynamics. Yet, small-scale planetary boundary layer turbulence and shallow convection still need to be parameterized, which in SCREAM is accomplished through the turbulent-kinetic-energy-based (TKE-based) simplified higher-order closure (SHOC) – a simplified version of the assumed-double-Gaussian-PDF (probability density function) higher-order closure method. Here, we present the implementation of a stochastic multi-plume mass-flux (MF) parameterization of dry and shallow convection in SCREAM to go beyond the limitations of double-Gaussian-PDF closures and couple it to SHOC (SHOC+MF). The new parameterization implemented in a single-column model-type version of SCREAM produces results for two shallow cumulus convection cases (marine and continental shallow convection) that agree well with the reference data from large-eddy simulations, thus improving the general representation of the thermodynamic quantities and their turbulent fluxes as well as cloud macrophysics in the model. |
In-person | yes |
Poster | poster |
Discussion Link |