Abstract:

Base on observed haze data in 2010 at Nansha weather station, haze processes of different synoptic types were simulated using a haze numerical forecast system. Main control factors, air pollution components, and pollution contribution of various emission sources under different weather systems in the Pearl River Delta region were analyzed. The results show that simulated values from the haze numerical forecast system and observed values are in similar variation trends. In addition to individual extremum, simulation results can better and qualitative reflect the variation of pollutant concentration, so the system is suitable to simulate air pollution status in the Pearl River Delta region. Pollutant concentrations are high when it is controlled by continental denatured high and outer circulation of tropical cyclones, especially concentrations of PM₁₀, PM_2.5, EC (Elemental Carbon), OC (Organic Carbon) and CO (Carbon Oxide). Concentrations of EC, OC and CO is very low and other pollutants’ concentrations are close to zero when cold air moves to southward or without significant weather system. Whether haze appears or not, concentrations of EC, OC and CO are higher than that of other pollutants in the Pearl River Delta region, which suggests that carbon pollution is serious in this region.

Key words: Haze numerical forecast system, Numerical simulation, Synoptic type