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Multiple‐instance superparameterization, part 2: the effects of stochastic convection on the simulated climate

Jones, T. R., Randall, D. A. and Branson, M. D. (2019) Multiple‐instance superparameterization, part 2: the effects of stochastic convection on the simulated climate. Journal of Advances in Modeling Earth Systems, 11 (11). pp. 3521-3544. ISSN 1942-2466

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To link to this item DOI: 10.1029/2019MS001611

Abstract/Summary

The cloud-permitting model (CPM) of the super-parameterized Community Atmosphere Model (SP-CAM) is a stochastic parameterization. As reported in a companion paper, we have created a variant of SP-CAM, called MP-CAM, that uses the averaged feedback of ten independent two-dimensional CPMs in each global model column, in place of the single CPM of SP-CAM. This ensemble-averaged feedback is interpreted as an approximation to the feedback from a deterministic parameterization. We present evidence that MP-CAM is indeed more deterministic than SP-CAM. The climates of the SP and MP configurations are compared, giving particular attention to extreme precipitation events and convectively coupled large-scale tropical weather systems, such as the Madden-Julian Oscillation (MJO). A number of small but significant changes in the mean-state climate are uncovered, and the deterministic parameterization slightly degrades the MJO simulation.

Item Type:Article
Refereed:Yes
Divisions:Science > School of Mathematical, Physical and Computational Sciences > Department of Meteorology
ID Code:86146
Publisher:American Geophysical Union

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