4.15 Assessment of CALPUFF for Modeling Winter-Time PM_(10) in Christchurch, New Zealand

摘要

Christchurch, in New Zealand's South Island, has PM_(10) concentrations in winter that exceed the WHO 24-hour guidelines. CALPUFF has been used to model the distribution of PM_(10) concentrations across the city of Christchurch during winter 2005 and 2006. CALMET was shown to effectively develop the terrain induced surface flows that affect Christchurch on light-wind evenings. The modeling of wintertime PM_(10) in the city was verified against measured data at two sites. The model captured diurnal variability well but daily values were generally too high, although the long term averages were shown to be within 10% of the measured values. The model was able to predict high pollution days with reasonable skill, with a rank correlation of 0.63 to 0.80.