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Four years of bulk,high-volume aerosol samples were collected during the cruise of Chinese National Antarctic Research Expedition from Shanghai,China,to the Southern Ocean to Zhongshan Station in the Eastern Antarctica.The results were also compared to the cruise from China to Arctic.Nss SO4 2- peaked near cities (Shanghai),but the four years records of MSA peak near maritime Antarctica.We suggested two possible sources for MSA: phytoplankton and animals (penguins or seals) feces.