| Summary: | The carbonate system plays a major and fundamental role for marine resources in seas and oceans around the world, where marine resources have start to be affected by the once very stable carbonate system. The changes in the Chilean Patagonia can be due to processes from different origin like metabolism, freshwater input, natural cycles, volcanic activity (Calbuco volcano eruption, year 2015), global climate change (global warming and ocean acidification), among others. This doctoral thesis analyzes the Reloncaví fjord (41º35’ S; 72º20’ W) placed in the north Patagonia, because of its particularities: highly haline stratified, seasonal, and it’s intensive and extensive use for aquaculture practices. Because of that and following the relationship of the main drivers for the carbonate system in the Reloncaví fjord was proposed the following research hypothesis: “The Reloncaví fjord carbonate system has a temporal dynamic driven by constants biological, chemical and physical changes, where photosynthesis and freshwater inputs plays a major role affecting the omega aragonite saturation. Therefore, is expected that in terms of CO2 fluxes the system will act as a net CO2 sink”. The main objective was to establish the annual dynamic of the Reloncaví fjord inorganic carbonate system through high temporal resolution measurements, stablishing the relation between the system’s different stressors, moreover defining the net CO2 balance altogether with determining the carbonate systems responses respect to the future scenarios modelled by the IPCC up the year 2100. To address this objective, three chapters were made in order to meticulously analyze the Reloncaví fjord’s inorganic carbonate system and their implications for marine-estuarine life and aquaculture. First chapter analyze the seasonal dynamic of the carbonate saturation state, airsea CO2 fluxes and the different variables relationships. Chapter two focus on the ash-leaching experiences and the environmental feedback that followed the volcanic eruption of the ...
|
|---|