Biological and Environmental Research - Earth and Environmental System Sciences
Earth and Environmental System Modeling

Effects of Organized Convection Parameterization on the MJO and Precipitation in E3SMv1. Part I: Mesoscale Heating

TitleEffects of Organized Convection Parameterization on the MJO and Precipitation in E3SMv1. Part I: Mesoscale Heating
Publication TypeJournal Article
Year of Publication2021
AuthorsChen, C.-C., Richter J. H., Liu C., Moncrieff M. W., Tang Q., Lin W., Xie S., and Rasch P. J.
JournalJournal of Advances in Modeling Earth Systems
Volume13
Number6
Abstract / Summary

Mesoscale organization of convection is typically not represented in global circulation models, and hence its influence on the global circulation is not accounted for. The heating component of a parameterization that represents the dynamical and physical effects of circulations 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). Numerical simulations are conducted to assess its impact on the simulated climate. Besides E3SMv1 simulations, we performed high-resolution (2 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. MCSP heating enhances Kevin wave spectra in E3SMv1, improves the representation of the Madden-Julian Oscillation, and reduces precipitation biases over the tropical Pacific.

URLhttp://dx.doi.org/10.1029/2020ms002401
DOI10.1029/2020ms002401
Journal: Journal of Advances in Modeling Earth Systems
Year of Publication: 2021
Volume: 13
Number: 6
Publication Date: 06/2021

Mesoscale organization of convection is typically not represented in global circulation models, and hence its influence on the global circulation is not accounted for. The heating component of a parameterization that represents the dynamical and physical effects of circulations 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). Numerical simulations are conducted to assess its impact on the simulated climate. Besides E3SMv1 simulations, we performed high-resolution (2 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. MCSP heating enhances Kevin wave spectra in E3SMv1, improves the representation of the Madden-Julian Oscillation, and reduces precipitation biases over the tropical Pacific.

DOI: 10.1029/2020ms002401
Citation:
Chen, C, J Richter, C Liu, M Moncrieff, Q Tang, W Lin, S Xie, and P Rasch.  2021.  "Effects of Organized Convection Parameterization on the MJO and Precipitation in E3SMv1. Part I: Mesoscale Heating."  Journal of Advances in Modeling Earth Systems 13(6).  https://doi.org/10.1029/2020ms002401.