Analysis On The Spatio-temporal Variations Of Dust-fall And The Physical-chemical Properties Of TSP In Tarim Basin

Based on monitored data of14monitoring stations in Tarim basin, This paper,the discussion and analyses of the characteristics on spatiotemporal variations ofdust-fall during2008to2010, TSP characteristics of Tazhong, Tikanlik, Minfeng andKashighar during2009to2010, and water soluble ions in TSP of the four monitoringstations in2010, discussed the spatial variation regularities near the ground. Theresults of this paper can be summarized as follows:(1) The atmospheric dust-fall in Tazhong was highest among the14stationsduring2008-2010. The spatial distribution characteristics of dust-fall in the TarimBasin was observed in the order of southern> western> eastern> northern.Atmospheric dust-fall in the Tarim Basin was mainly collected in spring and summer(from March to August). There was little atmospheric dust-fall in autumn and winter,sand-dust weather is the main factor that influence on the TSP concentration. In2008,dust-fall at the four sites showed the positive correlations except Tazhong andKashighar, in2009there had the positive correlations,2010except Tazhong andMinfeng.(2) The atmospheric dust-fall of Tazhong was highest among the4stations in2010and2009. Dust-fall and TSP had the similar spatial distribution characteristics.Minfeng and Tikanlik, had the similar monthly variation characteristics, in the periodof March to May there always a bigger peak value while a smaller peak value fromAugust to October, extremely high value in individual month. Due to geographicallocation, climatic conditions and human factors, TSP concentration in differentregions are just slightly different,was mainly collected in spring and summer. The4stations significant at the0.05level, There's no significant correlation between themin2008and2010.(3) Cations of the4stations in TSP were in the order of Ca²⁺> Na⁺> K⁺>NH₄⁺> Mg²⁺in2010, different stations showed a high degree of similarity. The distribution of three major cations (Ca²⁺, Na⁺and K⁺) was Tikanlik> Tazhong>Minfeng> Kashighar. Anion distribution were all in the order of SO₄^2-> Cl^-> NO₃^->F^-. Before August the4anions among the4stations were all in the order of Tikanlik>Tazhong> Minfeng> Kashighar. It started on1st August that the concentration of F-was Kashighar> Tazhong> Minfeng> Tikanlik. Cl-and SO₄^2-were in the order ofTazhong> Minfeng> Tikanlik> Kashighar, NO₃^-was Tazhong> Kashighar>Tikanlik> Minfeng. The distribution of Ionic components had the similarity with theaerosol concentration. Except for NH₄⁺, Ions were mainly distributed in Summer andlower value in Autumn of Minfeng, cations in Kashgar showed high value in winterand low value in summer, Tikanlik was similar to that of Minfeng, Except for NH₄⁺,other cations of Tazhong showed high values in spring and autumn and low values inwinter, but in Summer NH₄⁺had the highest value. The highest values of anions inMinfeng appeared in winter, in addition to F-, other anions in Kashighar showed highvalues in Winter and Spring, and low values in Summer and Autumn. Anionconcentrations in Spring was higher than other seasons in Tikanlik, the distribution ofanions were similar to cations in Tazhong. The concentration of SO₄^2-is the highest,and accounting for40.9%of the total ion concentration. SO₄^2-, Cl^-, Ca²⁺and Na⁺were the four major ions, they together accounting for more than90%of the total ions.There was a good correlation among cations and anions. TSP liquor was proved aweak acid, high SO₄^2-was the main factor that influence the PH value of TSP.