Temperature and salinity are key factors in controlling the flux of carbon dioxide in the ocean. High temperatures and salinity decrease the solubility of CO₂ in seawater, causing surface water to rise and weakening the ocean's ability to absorb CO₂, potentially turning it into a source of carbon. This study aims to clarify the combined mechanisms of physical transport and chemical buffering at the land-sea interface, providing scientific evidence for blue carbon strategies amid climate change. We establish an integrated research approach that combines high-frequency, spatiotemporally detailed numerical simulations with observations. Field and numerical studies were conducted in Qigu Lagoon, a highly representative site for studying tropical lagoon carbon cycling. The impacts of climate change include further quantification of how physical processes, such as wind-wave fields, sea level rise, and extreme rainfall, influence these systems. This study combines observations and numerical modeling to develop a coupled 'physical transport—chemical buffering' mechanism model, evaluating how climate drivers affect air-sea CO₂ flux and carbon sink benefits, thus reducing estimation uncertainties.
 

numerical modeling; lagoon hydrodynamic;Climate Change;land-sea interface mechanisms;