污染源、气象条件变化对我国SO_2浓度及硫沉降量分布的影响

Effect of Evolutions of Source Emissions and Meteorological Factors on SO_2 Distribution and Sulfur Deposition in China

用三维欧拉型污染物长距离输送模式 ,模拟了中国大陆SOx的分布 ,并采用不同时期 ( 1 975、 1 980、 1 987年 )的污染源与气象场资料 ,分析了污染源与气象条件变化对SOx分布产生的影响。研究表明 ,在该期间中国SOx污染比较严重的地区 ,气象条件变化导致SO2 浓度和硫沉降量的相对变化通常在 2 0 %左右 ;污染源对SO2 浓度与硫沉降量的作用通常大于气象条件 ,污染源变化产生的SO2 浓度与硫沉降量的相对变化率为气象条件变化的几倍 ,甚至 1～ 2个量级 ,尤其SOx污染比较严重的地区更为明显 ;但对西北及青藏高原地区 ,在源排放量变化不大 ,而气象条件变化较显著时 。

Using a 3\|D Eulerian transport model with actual emissions and meteorological data (1975,1980, and 1987),we analyzed the roles of key factors impacting on SO x distribution. The results implied the relative impact ratios of SO 2 concentrations and sulfur depositions induced by meteorological factors are about 20% for a period of that time, which are less several times than those by source emissions. However it is possible that the meteorological factors show major effect when there are significant variations of meteorological conditions and less disparity of emissions in Northwest China and the Tibetan Plateau areas.