Nutrient elements in the atmospheric wet deposition in Changjiang River estuary

In order to study the effects of atmospheric wet deposition on red tide, five kinds of nutrient elements were measured with 64 rainwater samples collected at Shengsi Archipelago from May 2000 to April 2001. The results showed that there were obvious differences between monthly average concentrations, due to the different resource and precipitation. The variation of seasonal fluxes suggested that the wet deposition might cause red tide except in winter. The annual concentrations of NO₃^-N, NH₄⁺ -N, NO₂^- -N, PO₄^3- -P and SiO₃^2- -Si were 20.23, 30.14, 0.11, 0.045 and 3.43μmol·L^-1, respectively, and their annual fluxes were 2.67 × 10⁸, 3.98 × 10⁸, 0.014 × 10⁸, 0.0059 × 10⁸ and 0.45 × 10⁸ mol, respectively. Compared with river input, they were much more smaller.