On the diurnal cycle and variability of winds in the lower planetary boundary layer: evaluation of regional reanalyses and hindcasts

To accurately calculate the impact of renewables on power production in complex electric grids, high-resolution and ideally seamless data within planetary boundary layer are required. Therefore, quality different regional reanalyses hindcasts is evaluated with respect to representation planetery related sub-daily processes. On one hand, high resolution reanalysis from UERRA (UE-SMHI, UE-UKMO) a similar project (COSMO-REA6) considered. other two based COSMO-REA6 configuration included this study, i.e. simulation perfect boundaries additionally utilizing spectral nudging. The focus evaluation measurements at four flux towers that not part any assimilation procedure. In paper, we will show model’s depends both complete model system – method, physical parameterization as well performance measure. daily cycle best depicted by even hardly introduces spurious variability. UE-SMHI (3D-Var) suffers spin-up particular visible elevated levels, whereas damped UE-UKMO (4D-Var). Investigation atmospheric stability reveals diurnal variation stratification for most reproduced, but strong deficits were found all COSMO simulations reproducing corresponding wind speed gradients. Moreover, an overestimation superadiabatic lapse rates overly weak turbulent mixing UE-UKMO. Furthermore, combination ramp statistics contingency tables utilized detect clear advantage sophisticated systems over hindcasts. framework presented underpins importance vertical measurement profiles, especially assessing long-term simulations.