Abstract
Effects of wet deposition of ammonia-N and nitrate-N on algal blooming in Mikawa Bay, Japan, where N is known as limiting factor for eutrophication, were numerically investigated by using a modified CE-QUAL-W2 model, a fluid-dynamic/ecological model. Three years simulations from April, 1998 to March, 2001 were performed for the cases with and without the wet deposition of N compounds. Results show the amount of N loading through precipitation is about 10 % of that from rivers, yet chlorophyll-a concentration in near-sea-surface water can be drastically increased by adding this wet deposition, and the calculated concentrations come close to observation. The nature of N loading by wet deposition, which provides the nutrient to photosynthesis active area, will explain this phenomenon.
