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Vertical structure and diabatic processes of the Madden-Julian oscillation

Klingaman, N. P., Jiang, X., Xavier, P. K., Petch, J., Waliser, D. and Woolnough, S. J. (2017) Vertical structure and diabatic processes of the Madden-Julian oscillation. In: Chang, C.-P., Kuo, H.-C., Lau, N.-C., Johnson, R. H., Wang, B. and Wheeler, M. C. (eds.) Global Monsoon System: Research and Forecast (3rd Edition). World Scientific Series on Asia-Pacific Weather and Climate, 9. World Scientific, New Jersey, pp. 161-172. ISBN 9789813200906

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To link to this item DOI: 10.1142/10305

Abstract/Summary

The “Vertical Structure of Diabatic Processes of the Madden-Julian Oscillation” global-model evaluation project developed a novel experimental framework, which produces a complete characterization of models’ abilities to simulate the Madden-Julian oscillation (MJO). The three components of the project comprise 2-day and 20-day hindcasts and 20-year simulations; each obtained heating, moistening and momentum tendencies from the models’ sub-grid parameterizations. Thirty-five centers provided output for at least one component; nine centers provided data for all three. The models vary greatly in MJO fidelity in climate and hindcast experiments, yet fidelity in one was not correlated with fidelity in the other. In 20-year simulations, strong MJO models demonstrated heating, vertical-velocity and zonal-wind profiles that tilted westward with height, as in reanalysis data. The 20-day hindcasts showed no correspondence between the shape of the heating profile and hindcast skill. Low-to-mid-level moistening at moderate rain rates was a consistent feature of high-skill models and absent from low-skill models, suggesting a role for boundary-layer and congestus clouds in the MJO transition, which was confirmed by timestep data from the 2-day hindcasts. These hindcasts revealed a poor simulation of the MJO transition phase, even at short leads, with large mid-tropospheric dry biases and discrepancies in radiative-heating profiles.

Item Type:Book or Report Section
Refereed:Yes
Divisions:Interdisciplinary centres and themes > Walker Institute
Faculty of Science > School of Mathematical, Physical and Computational Sciences > NCAS
Faculty of Science > School of Mathematical, Physical and Computational Sciences > Department of Meteorology
ID Code:69153
Publisher:World Scientific

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