School of Environmental Science and Engineering,Sun Yat-san University,Guangzhou 510275,China;
Nanjing Institute of geography and Limnology,Chinese Academy of Sciences NIGLAS,Nanjing 210008,China;
Nanjing Institute of geography and Limnology,Chinese Academy of Sciences NIGLAS,Nanjing 210008,China;
Nanjing Institute of geography and Limnology,Chinese Academy of Sciences NIGLAS,Nanjing 210008,China;
rainfall chemistry; backward air mass trajectory; synoptic situation;