title: A spectral method for spatial downscaling.
abstract: Complex computer models play a crucial role in air quality research. These models are used to evaluate potential regulatory impacts of emission control strategies and to estimate air quality in areas without monitoring data. For both of these purposes, it is important to calibrate model output with monitoring data to adjust for model biases and improve spatial prediction. In this article, we propose a new spectral method to study and exploit complex relationships between model output and monitoring data. Spectral methods allow us to estimate the relationship between model output and monitoring data separately at different spatial scales, and to use model output for prediction only at the appropriate scales. The proposed method is computationally efficient and can be implemented using standard software. We apply the method to compare Community Multiscale Air Quality (CMAQ) model output with ozone measurements in the United States in July 2005. We find that CMAQ captures large-scale spatial trends, but has low correlation with the monitoring data at small spatial scales.
authors: North Carolina State University, Raleigh, North Carolina, U.S.A.
authors: Brian J
authors: BJ
authors: Reich
authors: Howard H
authors: HH
authors: Chang
authors: Kristen M
authors: KM
authors: Foley
mesh_terms: D000397:Air Pollution / Q000032:analysis / Q000706:statistics & numerical data*; D000465:Algorithms; D003198:Computer Simulation; D003627:Data Interpretation, Statistical; D004784:Environmental Monitoring / Q000379:methods* / Q000706:statistics & numerical data*; D015233:Models, Statistical; D010126:Ozone / Q000032:analysis*; D015203:Reproducibility of Results; D018401:Sample Size; D012680:Sensitivity and Specificity; D062211:Spatio-Temporal Analysis; D014481:United States
chemical_list: D010126:Ozone
keywords: Computer model output; Data fusion; Kriging; Multiscale analysis