A Research Of The Feature And Influencing Factors Of Haze In Shanghai

With the rapid development of Chinese economy, the increasing discharge of energy and waste emission has worsened the regional visibility; regional haze problem has appeared to be more and more distinct. Under inversion and other weather conditions, haze is a form of urban and regional pollution, causing by aerosol. When haze happens, the concentration of particulate goes up, seriously damaging people's health.Since the international definitions of 'haze' vary from one another, this article colligates the definition from weather as well as pollution point of views, analyzing the weather and pollution statistics period from May 2008 to Apr 2009. It also compares track tracing from various seasons. Concrete work and results are shown below:1,Introduce various definitions of haze; Compare each definition's applicability and limitations. Define haze in Shanghai region, based on its pollution characteristics, formation factors, weather phenomenon and others, excluding the interfere such as rain, fog.2,Utilize cluster analysis to classify and grade into five kinds. Through backscatter to verify the visibility and pollution concentration, so as to prove their rationality.3,Under the definition of haze, analyze its data from May 2008 to Apr 2009, compares the occurrence pattern and other important factors such as visibility,relative humidity,wind speed,AOD, etc.4,Thermo-Andersen PM2.5 flux sampling appearance was used to have 3 continuous observations during Jan to Feb, Apr to Jun and Oct to Nov, which represents winter, spring and autumn in Shanghai respectively. Chemical analysis was offered with the samples got to show the components change of ion, elements and carbon before and after the haze. Main components analysis of iron and elements were made to reflect main affecting pollutants of haze. 5. Trajectory clustering of pollutants was made in hazing days by season, and the amount, path and resource of each air mass arrived in shanghai in different seasons was compared by 72hr track tracing.According to the researches made above, a proper definition and identification was given to haze, which not only helped to get a better understanding to the generation mechanism and atmosphere condition required by haze, but also offered a basis for the whole series of observation, estimation, prediction and corresponding index system of haze.