EGU24-13978, updated on 09 Mar 2024
https://doi.org/10.5194/egusphere-egu24-13978
EGU General Assembly 2024
© Author(s) 2024. This work is distributed under
the Creative Commons Attribution 4.0 License.

A Positive-Definite Moist EDMF Parameterization Scheme for Turbulent Mixing in the PBL

Evelyn Grell1,2 and Jian-Wen Bao2
Evelyn Grell and Jian-Wen Bao
  • 1University of Colorado, CIRES, Boulder, CO, USA
  • 2NOAA Physical Sciences Laboratory, Boulder, CO USA

Planetary boundary layer (PBL) parameterizations using the eddy diffusivity - mass flux (EDMF) technique for turbulent mixing in the convective PBL have been popularly used in weather and climate models.  When including moist adjustment processes, some numerical implementations of the EDMF parameterization may result in unphysical solutions of cloud condensate, for example, negative cloud water quantities.  To solve this problem, a procedure to obtain a positive definite solution is proposed to solve the moist EDMF equations.  In this presentation, we will demonstrate the formulation of the solution procedure and show examples of its impact on the PBL mixing simulation using a single-column model.

How to cite: Grell, E. and Bao, J.-W.: A Positive-Definite Moist EDMF Parameterization Scheme for Turbulent Mixing in the PBL, EGU General Assembly 2024, Vienna, Austria, 14–19 Apr 2024, EGU24-13978, https://doi.org/10.5194/egusphere-egu24-13978, 2024.