A simple model of convection with memory

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Davies, L., Plant, R. S. orcid id iconORCID: https://orcid.org/0000-0001-8808-0022 and Derbyshire, S. H. (2009) A simple model of convection with memory. Journal of Geophysical Research, 114. D17202. ISSN 0148-0227 doi: 10.1029/2008JD011653

Abstract/Summary

There are at least three distinct time scales that are relevant for the evolution of atmospheric convection. These are the time scale of the forcing mechanism, the time scale governing the response to a steady forcing, and the time scale of the response to variations in the forcing. The last of these, tmem, is associated with convective life cycles, which provide an element of memory in the system. A highly simplified model of convection is introduced, which allows for investigation of the character of convection as a function of the three time scales. For short tmem, the convective response is strongly tied to the forcing as in conventional equilibrium parameterization. For long tmem, the convection responds only to the slowly evolving component of forcing, and any fluctuations in the forcing are essentially suppressed. At intermediate tmem, convection becomes less predictable: conventional equilibrium closure breaks down and current levels of convection modify the subsequent response.

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Item Type Article
URI https://reading-clone.eprints-hosting.org/id/eprint/1657
Identification Number/DOI 10.1029/2008JD011653
Refereed Yes
Divisions Science > School of Mathematical, Physical and Computational Sciences > Department of Meteorology
Uncontrolled Keywords cloud-ensemble; parameterization; variability; equilibrium; cycle; simulations; equations; time
Publisher American Geophysical Union
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