Spatial Distribution Analysis Of PBL Sulfur Dioxide By The Ozone Monitoring Instrument

Atmospheric remote sensing,in the background of the climate change paid attention by all over the world,has important research value and significant application in dynamics and continuous monitoring of atmosphere ambience,such as monitoring and evaluating air quality,major environmental accidents and forecasting air pollutions.Through integrating Geography Information System(GIS) analysis method and remote sensing image processing technology,the paper mainly analyses the variety of Planetary Boundary Layer(PBL) SO₂ on basis of measurements from one of the Earth Observation System(EOS) satellites instrument Aura/OMI in the period of Februarys 2005～2008 over Lanzhou-Paiying(Lan-Pai) and Jingchang region in Gansu,Xining-Tonren region in Qinghai.Overall,the study region exists two SO₂ high-level areas,Jingchang region and Lan-Pai region.In the view of high-level seasonal change,the study shows that the spacial distribution of SO₂ has large seasonal variation.The feature of Gaussian distribution model presents when SO₂ emission vastness.As the result of the winter heating impact,in February PBL SO₂ of study area reaches the maximum whether area or mean column value.The column of polluted area that equals to six times column of clear area is about 17,467 km².On the contrary,Spring and Autumn have comparatively low level because of climate,rain and vegetation elution and detergence.In Jingchang region seasonal variation area of SO₂ 0.81DU column that equals to four times column of clear area is about 2547 km²,Lan-Pai area is 9,410km² that column is 0.81DU.In the aspect of high-level annual change,the key points of high-level is one third covered in the zone of 36.5°±0.5°N.The main sources are industry and anthropic sources in the line of Paiying-Lanzhou-Xining,which is recognised the region's main contribution source.The spacial distribution of PBL SO₂ is significantly variation in winters of study region.Lan-Pai SO₂ high-level region tends to extenuation, transformation of diffusing direction from north-south to east-west,the primary centres changing to multi-centres,and Paiying region emission reducing continuously.Finally,the total amounts of PBL SO₂ is calculated in the precision of interpolation of 0.04°by the method that S.A.Carnt and A.J.Krueger is used to gain the SO₂ emissions of Ecuador volcanoes during Februrys 2005～2008.The results show that the mean amount is 85,000 tons.In the periods of Februrys 2005～2007 the total amount reduce about 18,000 and 13,000 tons,the mean annual degression about 20%,but the amount ascend to two times from 2007 to 2008.Lan-Pai emissions have more stabilization than Jinchang,and 50.3% total amount is emission from Jingchang resource.