David A Randall

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1) The moist available energy of a conditionally unstable atmosphere

Author

Randall, David A

Series

Atmospheric science paper volume no. 440

Pub. Date

1989.

Description

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The concept of "moist available energy," defined by Lorenz is applied to study the potential energy available for cumulus convection in a conditionally unstable atmosphere.

2) Applications of a prognostic turbulence kinetic energy in a bulk boundary-layer model

Author

Randall, David A

Series

Atmospheric science paper volume no. 437

Pub. Date

1989.

Description

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Bulk models of the planetary boundary layer (PBL) conventionally rely on diagnostic forms of the turbulence kinetic energy (TKE) equation to determine the entrainment rate. During episodes of rapid deepening or shallowing, the local time rate of change of the vertically integrated TKE becomes significant compared to the difference between gross production and dissipation. A method is presented to determine the entrainment rate in a bulk PBL model...