Estimate of ammonia fluxes at the air-sea interface in the Guanabara Bay: a preliminary study

摘要

In the begining of April 2004, concentrations of NHx (NH3 + NH4+) were measured in surface waters of the Guanabara Bay. Concentrations varied from 2 to 143 mmol L-1. Ammonia exchange at the air-sea interface was quantified using a numerical model. No measurement of NH3 concentration in air (cair) was performed. Thus, calculations of NH3 flux were based on the assumptions of cair = 1 and 5 µg m-3. Fluxes were predominantly from the water to the atmosphere and varied from -20 to almost 3500 µg N m-2 h-1.