Abstract：The long-term hazy days from 1961 to 2007 were reconstructed and the spatial and temporal characteristics of the haze in the Yangtze River Delta (YRD) region were analyzed. The impacts of surface and near-surface meteorological conditions and air pollution on the haze occurrences were also considered using the methods of climate statistics, remote sensing and GIS analysis. The results indicated that the reconstructed hazy days with the consideration of humidity and visibility were fairly consistent with the measured records. From 1961 to 2007, the number of hazy days in the YRD region increased significantly, especially in Hangzhou and Nanjing. In the recent 30 years, the annual hazy days and their variations were different among large cities, medium-sized cities and towns and villages in the YRD region. Air pollution, surface wind speed and monthly longest consecutive dry days were closely correlated with the occurrence of hazy days in the YRD region. The removal processes of the occurrences of haze in the region were also influenced significantly by near-surface temperature, geo-potential height and wind field. The variation trends of hazy days in the YRD region were consistent with those in Beijing-Tianjin-Hebei region and Pearl River Delta. The possible reason of increasing hazy days was the increasing emissions of air pollutants, especially the increase of fine particles. The changed meteorological conditions caused by global climate change and regional urbanization were also the reasons of the increasing hazy days.
史军, 崔林丽. 长江三角洲城市群霾的演变特征及影响因素研究[J]. 中国环境科学, 2013, 33(12): 2113-2122.
SHI Jun, CUI Lin-Li. Characteristics and influencing factors of haze in the Yangtze River Delta region. CHINA ENVIRONMENTAL SCIENCECE, 2013, 33(12): 2113-2122.
