降尘空间分布与沙尘天气日数关系研究

降尘是沙尘暴、浮尘、扬沙等沙尘天气过程的反映,文中以甘肃省10个监测点15年(1986-2000年)降尘监测数据及沙尘天气日数数据,讨论降尘空间分布与沙尘天气日数之间的相关性,建立降尘与沙尘事件之间的回归方程。结果表明:在沙尘暴区和非沙尘暴区,降尘与沙尘天气的回归方程不同,前者沙尘暴系数(1.32)小于后者沙尘暴与扬沙和的系数(1.66),可以判断后者较之前者降尘量受沙尘暴和扬沙日数影响更大,可以突现出后者沙尘天气主要以浮尘为常态形式出现。前者浮尘系数远大于扬沙系数(3.72>0.21),表明前者降尘量受浮尘影响大于扬沙。前者常数项(291.6)明显大于后者(235.2),这代表两地区降尘量的背景值的不同。回归方程很好地解释了不同地区降尘与沙尘天气日数之间的关系。将降尘与沙尘天气日数的回归方程应用到研究区,求得研究区各气象站点降尘数据,结合GIS空间插值,绘制出该研究区降尘空间分布图。

Research on the relationship between dustfall spatial distribution and days of sand-dust weather

Because of lacking of long-term extensive monitor data of dustfall,the research on the spatial distribution of dustfall is very few.The dustfall is a reflect of sand-dust weather which contain airborne dirt,raising sand,sand storm.In this research the correlatin between the dustfall spatial distribution and sand-dust weather was studied based on the fifteen years of dustfall data and sand-dust weather in ten sites of Gansu provice,and the regession equation was got finally.It was discovered that the regession equation from dustfall and sand-dust weather was different between sandstorm area and non-sandstorm area.The duststorm coefficient of the former(1.32) is smaller than the duststorm and raising sand coefficient of the latter(1.66),which indicates that the later is more affected by the duststorm and raising sand than the former.The former airborne dirt coefficient(3.72) is bigger than raising sand(0.21),which indicates the former is more effected by airborne.And the constant of former(291.6) is also bigger than the latter(235.2),which stands for the different tolerant value of dustfall.the regession equation was applyed to the research area,and got the dustfall data of each meteorology site of research area based on the sandstorm weather data of research area.Finally,the dustfall spatial distribution map of research area was drawed based on the way of spatial interpolation of GIS.