基金supported by the National Natural Science Foundation of China (No.40940025)Natural Science Fund of Tianjin (No.07ZCGYSF02400 and 09JCYBJC07400)+2 种基金National ‘973’ Project (No.2007CB411807)State Oceanic Administration of the marine atmosphere-Chemistry and global change open fund of Key Laboratory (No.GCMAC0806)the National Natural Science Fund(No.41006002)