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Statistical Analysis and Numerical Simulation on Urban Haze in Chongqing Area

Author: LvMengYao
Tutor: LiuHongNian
School: Nanjing University
Course: Atmospheric Physics and Atmospheric Environment
Keywords: Haze Visibility Chongqing Source inventories Nanjing University urban air quality models
CLC: X513
Type: Master's thesis
Year: 2011
Downloads: 414
Quote: 1
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Abstract


With rapid development in recent years, people’s living standard has been improved dramatically. Along with it is the rapid urbanization and urban air pollution, especially the haze weather. Low visibility and haze weather has already become an critical environmental issue for many cities at present.This work, focusing on environmental issues in the metropolitan area of Chongqing, offered a comprehensive analysis on pollutants’characteristics and atmospheric haze’s statistical properties in this area, based on pollutant concentration data of the nine downtown districts from Chongqing Environmental Science Research Institute and standard key meteorological observation data from Shapingba weather station. The pollutant source emission inventories of Chongqing region is obtained, together with atmospheric haze simulation of this region by air quality forecast system in Nanjing University (NJU-CAQPS2.0). The main results and conclusions are as follows:1) In general, PM10 concentration is larger during winter, while smaller during summer, and has no difference between urban and suburban areas; suburban area has higher value during spring, and lower during fall; The annual average is 113.28μg/m3 for urban area, and 65.08μg/m3 for suburban area. The annual average urban-to-suburban ratio is 1.74.The main urban area PM10 exceeds the threshold value with the most number of days in December 2007,and with the highest percentage in February. The number of exceeding days is zero both in July and August. For suburban area, there are no exceeding days except December and February. The average exceeding percentage is highest in February; the highest exceeding percentage takes place in December.By comparison, we find that the urban area has comparatively higher number for both exceeding days and percentage. Moreover, the urban area has exceeding days almost every month, and the highest urban area exceeding percentage is five times of that of suburban.2) Through the year, the monthly average visibility of the daily 4-time-observation is generally low; the visibility is lower than 10km, no matter in terms of seasonal average or annual average; It reaches lowest during winter, no matter which of the 4-time. In terms of annual average, visibility is lowest at 08:00, and higher at

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CLC: > Environmental science, safety science > Environmental pollution and its prevention > Atmospheric pollution and its control > Particulate pollutants
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