| According to the different altitudes precipitation samples in Yulong Snow Mountain area in Yunnan Province from July 26 2005 to July 31 2005, the precipitation chemical characteristics of different altitudes were analyzed with the sea salt iron tracer analysis method. Sea salt tracer analysis showed that Cl-, Na+ had high proportion marine source, amounting 74.79% and 73.53% respectively while the other ions mainly were nonmarine sources. The average percentage of nonmarine sources of NO-3, SO2-4, K +, Mg2+, Ca2+ were 100%, 93.54%, 97.29%, 81.77%, 99.66%. Statistics chart showed the changes of cation outweigh the anion greatly. The cation concentration ranged between 0.51-5.26 mg/L and anion concentration ranged between 0.99-4.90 mg/L, inferring the cation have more complicated sources. Further analysis showed terrestrial ions, especially near source terrestrial ion composition greatly impact the precipitation ion concentration. Human activities lead to higher anion concentration at alt. 2950-4800 m and precipitation ion concentration was correlated significantly with local atmospheric circulation. The most rock are limestone caused high precipitation cations in Yulong Snow Mountain, such as Ca2+ and Mg2+. |
