A reduced form metamodel has been produced to simulate the effects of physical, chemical, and meteorological processing of highly reactive trace species in urban areas, which is capable of efficiently simulating the urban concentration, surface deposition, and net export flux of these species. A polynomial chaos expansion and the probabilistic collocation method have been used to develop the me...

Abstract. A series of model sensitivity experiments was designed to explore the effects different initial conditions and emissions in Xi'an December 2016; is a major city Fenwei Plain, which key area with respect air pollution control China. Three methods were applied for condition tests: clean simulation, restart continuous simulation. In simulation test, C00, C06, C12, C18, C24 conducted effe...

The emission characteristics of mobile sources in the Mexico City Metropolitan Area (MCMA) have changed significantly over the past few decades in response to emission control policies, advancements in vehicle technologies and improvements in fuel quality, among others. Along with these changes, concurrent non-linear changes in photochemical levels and criteria pollutants have been observed, pr...

We evaluate how regional characteristics of population and background pollution might impact the selection of optimal air quality model resolution when calculating the human health impacts of changes to air quality. Using an approach consistent with air quality policy evaluation, we use a regional chemical transport model (CAMx) and a health benefit mapping program (BenMAP) to calculate the hum...

[1] The effects of climate change on ozone and PM 2.5 concentrations over the eastern United States were investigated using the Global-Regional Coupled Air Pollution modeling System (GRE-CAPS). GRE-CAPS consists of the Goddard Institute for Space Studies (GISS) II' general circulation model with aerosol processes and ozone chemistry, the fifth-generation PSU/NCAR mesoscale model (MM5) regional ...

This report examines performance of four models with two compilers on the Intel Pentium 4 Xeon processor using the PAPI performance event library to collect performance counter values. The intent is to identify performance metrics that indicate where performance inhibiting factors occur when the codes execute. Results for operations, instructions, cycles, cache, table lookaside buffer misses, b...

[1] Probing techniques are useful to provide diagnostic evaluations of air quality models and to indicate the responses of model predictions to changes in emissions. Three probing tools are available in a three-dimensional air quality model, CAMx: the Decoupled Direct Method (DDM), the Ozone Source Attribution Technology (OSAT), and Process Analysis (PA). These tools are evaluated in terms of c...