INFLUENCING FACTORS ON AIR-SEA CO₂ FLUX AT CIGU LAGOON, TAIWAN

Abstract

 Cigu Lagoon is a famous lagoon for fish agriculture (oyster) and migration birds, where few seagrasses exist. We aim to investigate the environmental factors affecting carbon fluxes in Cigu Lagoon to understand the influence of fishery. SEM analysis was conducted to understand the influence of environmental factors on the air-sea CO₂ flux. The results suggest that the CO₂ flux is directly influenced by wind speed and indirectly by pH due to the influence of oysters. A three-dimensional environmental model, Fantom, was applied to investigate the effect of the wind on DIC at the water surface. It was demonstrated that strong wind enhances the vertical convection in the water column, resulting in high DIC at the water surface due to the mixing with higher DIC adjacent to the sea bottom.