| In recent years, the problem of atmospheric environment of China becomes more and more prominent, and major environmental pollution accidents take place frequently. Henan Province is one of the areas where have most serious air pollution in China. Zhengzhou is the core city of the Central Plains Economic Zone and has an irreplaceable role in the construction of the Central Plains Economic Zone. With Economic developing, how to control air pollution and improve air quality has also become more and more pressing issue. Due to the objective constraints like manpower and funds, the spatial and temporal distribution characteristics of pollutants can not be fully grasped. Air quality model is an important tool for the study of air pollution. It can be used to study the temporal and spatial variation of atmospheric pollution, forecast the evolution of air pollution situation, and assess the effect of air pollution control measures. It has begun to play an increasingly important role in scientific research and operational forecasting of air quality. This paper aims to analysis the spatial and temporal distribution status of Henan air pollutant, explore the formation process of the pollutants, and study the transmission of pollutants between the areas by simulation of regional air quality model, in order to offer theoretical basis to the formulation of regional air pollution control measures.This paper adopted the WRF-NAQPMS regional air quality model system, and selected typical pollution process of spring and winter. With the using of nested grid model, the spatial and temporal distribution of concentration of pollutants was simulated and analyzed, and the impact of regional transport to air quality of Zhengzhou was studied with a method of mass trajectory, the main conclusions are as the following:(1)The meteorological elements and the concentration of pollutants simulated by the model and the actual situation have a good consistency, indicating that NAQPMS can reasonable represent the pollution variation process and transportation of the regions.(2)By analyzing the spatial and temporal distribution of the weather situation and pollutants, it can be found that the weather conditions have an important impact to the accumulation of pollutants and formation and clear of pollution.(3) Regional transportation has a greater impact on the air quality in Zhengzhou region. Judging from the two simulated cases of this paper, the impact of regional transportation to Zhengzhou pollutants can not be overlooked. During the pollution process in March2011, the average impact of outside Henan to Zhengzhou major pollutants was about15%to20%, and when the highest concentration of pollutants appeared the external impact was more than50%. During the pollution process in January2013, the average impact of the external area to Zhengzhou PM2.5was36%, while the highest daily value was55%.(4) There is big difference of regional transport to different pollutants. In the pollution process simulated by this paper, the impact of external area to PM2.5was larger than SO2and NOx. This is mainly because of that there is more secondary pollutant in PM2.5, and it has a more significant impact in the process of long-distance transmission.(5)The weather conditions especially wind field the have an important impact on the transportation between different regions.(6) Air quality automatic forecasting of Zhengzhou can be realized by the model system. |
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