Do We Need to Parameterize Mesoscale Convective Organization to Mitigate the MJO-Mean State Trade-Off?
[1];
[2];
[3];
[4]
- Chonnam National Univ., Gwangju (South Korea); Univ. of Washington, Seattle, WA (United States); DOE/OSTI
- Department of Atmospheric SciencesUniversity of Washington Seattle WA USA
- School of Earth and Environmental SciencesSeoul National University Seoul South Korea
- Department of OceanographyChonnam National University Gwangju South Korea
Modifications in cumulus parameterizations that improve Madden-Julian oscillation (MJO) simulation tend to degrade the mean state—known as the MJO-mean state trade-off. The impacts of parameterizing mesoscale convective organization on the relationship between the MJO and the mean state simulation fidelity are examined. A series of experiments are made with a general circulation model that parameterizes the mesoscale convective organization and simulates well both the MJO and the mean state. In the control simulation, a prognostic nondimensional variable (Ω) represents the degree of convective organization. In order to examine the effect of the parameterized convective organization, fixed Ω values are imposed in a series of constrained experiments. The fixed-Ω simulations show a negative relationship between the MJO and the mean state simulation fidelity. The control simulation is deviated from the negative relationship, suggesting the parameterized mesoscale convective organization helps general circulation models to mitigate the MJO-mean state trade-off.
- Research Organization:
- Univ. of Washington, Seattle, WA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- Grant/Contract Number:
- SC0016223
- OSTI ID:
- 1612422
- Journal Information:
- Geophysical Research Letters, Journal Name: Geophysical Research Letters Journal Issue: 4 Vol. 46; ISSN 0094-8276
- Publisher:
- American Geophysical UnionCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Toward a Dynamical Foundation for Organized Convection Parameterization in GCMs
|
journal | December 2019 |
MJO Propagation Processes and Mean Biases in the SubX and S2S Reforecasts
|
journal | August 2019 |
Similar Records
Effects of Organized Convection Parameterization on the MJO and Precipitation in E3SMv1. Part I: Mesoscale Heating
MJO in Different Orbital Regimes: Role of the Mean State in the MJO’s Amplitude during Boreal Winter