06 Jul 2022
06 Jul 2022
Status: this preprint is open for discussion.

Transporting CRM Variance in a Multiscale Modelling Framework

Walter Hannah1 and Kyle Pressel2 Walter Hannah and Kyle Pressel
  • 1Lawrence Livermore National Laboratory, Livermore, CA
  • 2Pacific Northwest National Laboratory, Richland, WA

Abstract. An unphysical checkerboard pattern has recently been identified in E3SM-MMF that is hypothesized to be associated with the inability of the large-scale dynamics to transport fluctuations within the embedded CRM on the global grid. To address this issue, a method is presented to facilitate large-scale transport of CRM variance in E3SM-MMF. Simulation results show that the method is effective at reducing the occurrence of unphysical checkerboard patterns on a range of time scales, from days to years. This result is confirmed both subjectively through visual inspection and quantitatively with a previously developed pattern categorization technique. The CRM variance transport does not significantly alter the model climate, although is does tend to reduce temporal variance on fields associated with convection on the global grid.

Walter Hannah and Kyle Pressel

Status: open (until 31 Aug 2022)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on egusphere-2022-397', Fredrik Jansson, 03 Aug 2022 reply

Walter Hannah and Kyle Pressel

Data sets

Analysis code and condensed data subset Walter Hannah

Model code and software

DOE Energy Exascale Earth System Model version 2 Walter Hannah

Walter Hannah and Kyle Pressel


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Short summary
A multiscale modelling framework couples two models of the atmosphere that each cover different scale ranges. Traditionally, fluctuations in the small-scale model are not transported by the flow on the large-scale model grid, but this is hypothesized to be responsible for a persistent, unphysical checkerboard pattern. A method is presented to facilitate the transport of these small-scale fluctuations, analogous to how small-scale clouds and turbulence are transported in the real atmosphere.