Spatial-temporal variations of pollutant emission sources inversed by adaptive nudging scheme over Beijing-Tianjin-Hebei region based on the CMAQ model
The pollutant source assimilation of nudging inversion method was applied to simulate the local sources of SO2 and NOx in Beijing-Tianjin-Hebei region during January,March,July and November 2014.The strengths,patterns,and geographical distribution of SO2 and NOx sources were compared with the original sources and the performance of inversed-source-based modeling was evaluated.The results showed that the sources of SO2 and NOx present obvious seasonal variations and is the strongest in winter or heating period.A high pollutant emission zone in the direction of northeast-southwest was discovered along Tangshan,Beijing,Tianjin,Langfang,Baoding,Shijiazhuang,Xingtai and Handan in the front of the Taihang and Yan mountains.The pollutant emissions exhibit a typical "urbanization" effect,i.e.SO2 and NOx sources are high in the urban area and its surroundings and weak in the rural area.Compared with the initial-emission-based modeling,the inversed-emission-based simulation could better capture the spatial-temporal variations of air pollutants,especially during high pollution periods.
Beijing-Tianjin-Hebei areaair pollutionsource assimilation inversionSO2 and NOx simulationCMAQ model
NETL
NSTL
万方数据
维普
