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

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

TitleThe Role of the Mean State on MJO Simulation in CESM2 Ensemble Simulation
Publication TypeJournal Article
Year of Publication2020
AuthorsKang, Daehyun, Kim Daehyun, Ahn Min-Seop, Neale Richard, Lee Jiwoo, and Gleckler Peter J.
JournalGeophysical Research Letters
Volume47
Number24
Abstract / Summary

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.

URLhttp://dx.doi.org/10.1029/2020gl089824
DOI10.1029/2020gl089824
Journal: Geophysical Research Letters
Year of Publication: 2020
Volume: 47
Number: 24
Publication Date: 12/2020

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.

DOI: 10.1029/2020gl089824
Citation:
Kang, D, D Kim, M Ahn, R Neale, J Lee, and P Gleckler.  2020.  "The Role of the Mean State on MJO Simulation in CESM2 Ensemble Simulation."  Geophysical Research Letters 47(24).  https://doi.org/10.1029/2020gl089824.