Środowiskowe Seminarium Fizyki Atmosfery

This research seeks to advance theoretical methodologies and theirefficient implementations for very-high-resolution nonhydrostaticsimulation of the Earth's atmosphere general circulation usingsound-proof equations. Compressible dynamics is universally validacross the entire range of spatial and temporal scales (i.e., fromsmall-scale turbulence to planetary circulations) but imposecomputational limitations that are difficult to overcome. Becauseof that, current community efforts focus on sound-proof equationsfor modeling large-scale dry atmospheric motions. Numerical simulationof moist processes in nonhydrostatic general circulation modelsapplying sound-proof equations remains an uncharted territory.Using scale analysis, we demonstrate that the key issue for thesound-proof system is to include pressure perturbations (especiallylarger-scale near-hydrostatic perturbations) in the representationof moist thermodynamics. By comparing numerical solutions fromnumerical models applying either fully compressible or sound-proofequations for idealized dry flows, we documented that the pressurefields (either directly calculated in the compressible model orderived from the elliptic pressure solver in the sound-proof model)agree well. This paves the way to include pressure field derivedin the sound-proof system into the moist thermodynamics. Thispresentation will discuss these issues in more detail and presenttest cases suitable for the comparison between moist compressibleand sound-proof systems.