Skip to main content
U.S. flag

An official website of the United States government

Publication Date
28 December 2020

The Role of the Mean State on MJO Simulation in CESM2 Ensemble Simulation



This study examines the role of the mean state in the propagation of the Madden‐Julian oscillation (MJO) over the Maritime Continent (MC). We use an ensemble of simulations made with a single model—the Community Earth System Model version 2—to assess the effect of the mean state that is unaffected by that of model components such as parameterization schemes. Results show that the background meridional moisture gradient is much steeper over the MC region in the periods with a stronger MJO propagation. Column water vapor budget of the MJO strongly suggests that the simulated mean state affects MJO via its impacts on moisture dynamics—a greater advection of mean moisture by MJO wind in the MC region is responsible for the anomalous MJO activity.

“The Role Of The Mean State On Mjo Simulation In Cesm2 Ensemble Simulation”. 2020. Geophysical Research Letters 47. doi:10.1029/2020gl089824.
Funding Program Area(s)