Abstract
Mesoscale organization of convection is typically not represented in
global circulation models, and hence its influence on the global
circulation is not accounted for. A parameterization aiming at
representing the dynamical and physical effects of the circulation
associated with organized convection, referred to as the multiscale
coherent structure parameterization (MCSP), is implemented in the Energy
Exascale Earth System Model version 1 (E3SMv1). Simulations are
conducted to assess its impact on the simulated climate. Besides E3SMv1
simulations, we performed high-resolution (1 km) simulations using the
Weather Research and Forecasting (WRF) Model to determine the
temperature tendencies induced by mesoscale convective systems embedded
in deep convection. We tuned the free parameters of the MCSP based on
the WRF simulations. We found that the MCSP enhances Kevin wave spectra
in E3SMv1, improves the representation of the Madden-Julian Oscillation,
and reduces model precipitation biases over the tropical Pacific.