4.17 Application of Wavelet Filters in an Evaluation of Photochemical Model Performance

摘要

Wavelet analysis provides frequency specific information about observations and model outputs that can be useful in model evaluation. Differences in the strength (amplitude) between observations and model were illustrated for low-frequency (trend) and intra-day variation, while differences in both strength and timing (phase) were illustrated for seasonal, weekly and diurnal processes. Modulation of seasonal and diurnal ozone occurs at low frequencies (3-5 years for seasonal and 1 year for diurnal processes) and can be tied to low frequency variation in meteorological variables. Wavelet analysis of weekly variation can be used to identify spatial/temporal variation in weekday/weekend ozone air quality.