Precipitation Intensity Spectrum Analysis for Regional Climate Model Simulations over the Central United States
We replicated findings from Groisman et al. (2012) in the RegCM4.4 model runs, although results vary due to differences caused by convection schemes and lateral boundary conditions. To gain further insight into these extreme precipitation events we are analyzing the precipitation intensity spectrum. From previous analysis using fixed thresholds, there are indications of increased frequency of extreme precipitation events in the recent past and a greater increase in frequency for the warm season precipitation events. We examine precipitation intensity spectrum for both entire year records throughout the time period and the warm and cold season months of these same years. Results are compared to the precipitation intensity spectrum from daily rain gauge data to evaluate the accuracy of these extreme precipitation events.