区域大气质量评价数值模式系统的建立及试用

区域大气质量评价数值模式系统是以CALPUFF的应用开发为核心,根据陕西省的实际情况和大气环境业务服务需求,利用预报实时业务的网络环境,通过VB6.0编程,建立了一个具有自动数据处理、操作简便、比较实用的区域大气质量评价数值模式系统平台。依据2004年1月1日至12月31日的气象资料及源排放清单,对某工程的5个拟建地进行了大气质量数值模拟评价分析。结果表明,5地日均浓度超标的概率分别为27%、11%、5%、3%、8%。年平均浓度5地中3地未出现超负荷浓度值,满足2级标准要求,其他2地出现超负荷浓度值。其中一地污染超标最重,其可能原因是由于山体的影响,山谷中低层水平风速相对较小,不利于污染物的水平扩散,同时易形成地形山谷风次级环流,次级环流的存在把输送出去的污染物带回原地,形成二次污染。

Establishment and Trial Use of Regional Atmosphere Quality Evaluation Numerical Model System

Based on the CALPUFF Modeling System,a regional ambient air quality appraisal system was established for Xi'an.An introduction to the system is given.On the basis of the meteorological data information system and the regional ambient air quality appraisal and forecast system(CALPUFF)and meteorological data of 2004,the pollution emission inventory and current background status data,and the CALPUFF simulation system,the numerical simulation and analysis are made of the planned construction area status around emission sources,and the characteristics and regularities of pollutants dispersion in five planed construction areas are demonstrated.The differences of urban air pollution influencing factors in different areas are analyzed,and the regional ambient air quality appraisal of the five planed construction areas is quantitatively described.