A non column based fully unstructured implementation of Kessler s microphysics with warm rain using continuous and discontinuous spectral elements

TL;DR

This paper introduces a novel non-column based spectral element implementation of Kessler's microphysics with warm rain, enabling fully unstructured atmospheric models for high-resolution weather prediction.

Contribution

It presents the first non-column based spectral element microphysics implementation, compatible with unstructured grids, advancing high-resolution atmospheric modeling capabilities.

Findings

Results are comparable to existing benchmarks across tested resolutions.

The method can be adapted to various numerical schemes.

Supports both continuous and discontinuous spectral elements.

Abstract

Numerical weather prediction is pushing the envelope of grid resolution at local and global scales alike. Aiming to model topography with higher precision, a handful of articles introduced unstructured vertical grids and tested them for dry atmospheres. The next step towards effective high-resolution unstructured grids for atmospheric modeling requires that also microphysics is independent of any vertical columns, in contrast to what is ubiquitous across operational and research models. In this paper, we present a non-column based continuous and discontinuous spectral element implementation of Kessler's microphysics with warm rain as a first step towards fully unstructured atmospheric models. We test the proposed algorithm against standard three-dimensional benchmarks for precipitating clouds and show that the results are comparable with those presented in the literature across all of the tested effective resolutions. While presented for both continuous and discontinuous spectral elements in this paper, the method that we propose can very easily be adapted to any numerical method utilized in other research and legacy codes.