| The distribution of mercury and its action in the atmosphere constitute the important part of the environment recycle of mercury. But the study of distribution of Hg in the atmosphere is the weakness in the study about the mercury pollution in the atmosphere. Studying the distribution of Hg in the atmosphere by geostatistics method is of great importance to the development of mercury pollution studies. This paper studied the space variation of atmospheric concentration of Hg by adopting geostatistics method, the purpose is to find out the space variation regulation of atmospheric concentration of Hg, and take the geostatistics method as a new resolution to apply it to the spatial variation study of atmosphere characters, and we provide science basis for doing this . 1. By means of ordinary statistic analyze, mainly the analyze of variance coefficient (CV) and histogram, the following conclusions were drawn:The CV of mercury concentration of atmosphere in Dongyang town is very high, and On every month it is beyond 100%, however, The CV of mercury concentration of atmosphere in the main city zone of Beibei district varied between 19.6% and 175.5%, in the mass variability is intensive. Compared with the main city zone of Beibei district, CV in Dongyang town is far higher than that in the main city zone of Beibei, and this is mainly due to the influence of the obvious pollution source-trie clinical thermometer plant.As far as distribution class concerned, after logarithmic transformation, the data in main city zone accord with the normal distribution, which can be dealt with by means of ordinary Kriging interpolation method, but the data in Dongyang town don't accord with normal distribution, so we use indicator Kriging.2.By geostatistics analysis, which including Spatial correlation, nugget coefficient and structural variance, isotropy and anisotropy analysis, we can conclude:The spatial dependence range of the atmospheric concentration of Hg can be aggregation of spatial dependence of Hg in atmosphere, there by it can make us to understand the space character of atmospheric concentration of Hg from another angle. The analysis results prove that the space distributes of the atmospheric concentration of Hg in Dongyang town and main city zone of Beibei possess semi-variogram structure. On the whole, every month have very big spatial dependence range. In Dongyang town , from minimum spatial dependence range in July(399 meters) to maximum spatial dependence range in January, May, June, August.(1357 meters) .The space dependences of the atmospheric Hg in several months can be arranged : January, May, August, June> April>October>November>February>December> March> July. And spatial dependencerange of the atmospheric Hg in each month of the main city area in Beibei vary as follows: namely in February, October, December> January> July> June> April> March> August> November> May, among them the maximum value comes to 2347 meters, the minimum value in May is 591 meters. Moreover, seeing from its semi-variogram structure, sampling interval that being adopted does not exceed the spatial dependence range of each kind of atmospheric mercury, as a result, the evaluation to atmospheric Hg of the Beibei is to be sound and reasonable.In an analysis to the space variation of atmospheric Hg, nugget can be comprehended as the influence degree of human activity factor. The nuggets of atmospheric concentration of Hg in Dongyang town during eleven months reveal the trend: December > November > January> May > April> October> March>August > July > June, and the maximum nugget in February, it reached 32100.On the other hand ,the nuggets of atmospheric concentration of Hg in main city zone of Beibei during this eleven months reveal the trend: February> March > May> June, July> August > October> April > November December >January, The maximum nugget comes to 1 80, the minimum comes to be 2.4. Nugget in Dongyang town is far bigger than that in the main city zone of Beibei, So it show that pollution has far more in Dongyang town... |
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