Analysis of the planetary boundary layer with a database of large-eddy simulation experiments

TL;DR

This paper introduces a comprehensive LES database for planetary boundary layer studies, providing valuable simulation data to complement observational limitations and improve turbulence modeling.

Contribution

Development of a medium-resolution LES database (DATABASE64) covering various PBL conditions for research and model calibration.

Findings

DATABASE64 enables detailed PBL turbulence analysis.

Simulation data supports turbulence model calibration.

Database aids in theoretical validation of PBL dynamics.

Abstract

Observational studies of a planetary boundary layer (PBL) are difficult. Ground-born measurements usually characterize only a small portion of the PBL immediately above the surface. Air-born measurements cannot be obtained close to the surface and therefore cannot capture any significant portion of the PBL interior. Moreover, observations are limited in choice of instrumentation, time, duration, location of measurements and occasional weather conditions. Although turbulence-resolving simulations with a large-eddy simulation (LES) code do not supplant observational studies, they provide valuable complementary information on different aspect of the PBL dynamics, which otherwise difficult to acquire. These circumstances motivated development of a medium-resolution database (DATABASE64) of turbulence-resolving simulations, which is available on ftp://ftp.nersc.no/igor/. DATABASE64 covers a range of physical parameters typical for the barotropic SBL over a homogeneous rough surface. LES runs in DATABASE64 simulate 16 hours' evolution of the PBL turbulence. They are utilized to study both transition and equilibrium SBL cases as well as to calibrate turbulence parameterizations of meteorological models. The data can be also used to falsify theoretical constructions with regards to the PBL.