Atmospheric Dry And Wet Deposition Of Nutrient In East China Sea And Yellow Sea And It's Impact On Marine Primary Production

Dry and wet depositon samples were collectde from three sites, Qingdao, Qianliyan and Shensi, and determined their nutrient elements. Respectively, backward trajectories of raining clouds and aerosols were simulated by NOAA HYSPIIT₄ model in two heights to distinguish the different source of rainwater and aerosols. Water-soluble inorganic nutrients(DI(NO₃+NO₂),DINH₄,DIP,DSi), Water-soluble organic nutrients (DOP,DON) and acid-soluble nutrients (TI(NO₃+NO₂),TINH4,TIP) were measured in aerosols samples in Qingdao, while dissolved nutients (DI(NO₃+NO₂),DINH4,DIP,DSi,DOP,DON) were measured in rainwater samples. For the aerosol samples of Qianliyan and the rainwater samples of Shensi, dissolved inorganic nutrients(DI(NO₃+NO₂),DINH4,DIP,DSi)were measured.For the aerosols in Qingdao, the results indicate that there were obvious seasons of differences among on the concentrations of total suspended particulate (TSP). The TSP concentration in winter was 196.85μg/m³ while it was 143.46μg/m³ in summer due to the different amount of rainfall. The concentrations of DI(NO₃+NO₂) and DINH₄ had the lowest value during winter and spring when there were more sand duststorms, at the same time DIP level had its highest value. The most strong sand duststorm in that year was happened in 29th May 2009, in which samples DSi was the highest. This indicates that sand and dust in the air is not the main source of inorganic nitrogen compound, but it has important impact on both phosphorus and silicon compound in the aerosols. It has distinct differences among rainwater samples from different souce. The rain sources were classified based on the analysis by backward trajectory, and most rain samples were found from the northwest or north. The concentration of rainwater was intensely influenced by the dust and pollution in these area. Although Qingdao is located by the sea coast, but the concentrations of nutrients were mainly affected by continent.Aerosol samples of Qianliyan were classified by their sources in spring, the concentrations of TSP,DI(NO₃+NO₂),DINH4,DIP and DSi from continental source wre 1.6,1.7,2.2,1.2 and1.2 times to the oceanic ones respectively. The long-distance transport of the continental pollution is the main influent factor on Qianliyan inspite of its location in northwest Yello Sea.The average propotion of DON in TDN in rainwater of Shensi was 29%, the DOP in TDP was 47%. The new production was 18.3gCm^-2yr^-1, representing about 13% of the annual primary production on the continental shelf of the East China Sea, which shows the important impact on the ecosystem of the East China Sea. Based on the on-board dust incubationg experiments, the concentration of Chl-a didn't increase in the first days\, but later had an obvious increase tendency when dust was added. Different from the former rainwater onboard incubation experiments, the dust on-board experiments need long experiment cycle time. It indicates that the inputs of nutrients promote the marine primary production, and have a comprehensive impact on the marine ecosystem.