Are the estuaries of tropics experiencing Acidification?

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Abhijit Mitra

Yes, tropical estuaries are experiencing acidification, a process influenced by various factors that differ somewhat from the acidification trends observed in open oceans. In these estuaries, acidification results from a combination of natural and anthropogenic factors, including:

Carbon Dioxide Absorption: Similar to oceans, tropical estuaries absorb CO₂ from the atmosphere, which reacts with water to form carbonic acid, lowering pH levels. However, tropical estuaries often have high biological productivity, which affects CO₂ dynamics and acidification processes.

Runoff from Land: Tropical estuaries receive a substantial influx of freshwater and nutrients from rivers, carrying pollutants, fertilizers, and organic matter. This nutrient enrichment fuels algal blooms, which, when they die and decompose, increase CO₂ levels in the water and contribute to acidification.

Organic Matter Decomposition: The warm temperatures in tropical regions speed up the breakdown of organic matter in estuarine waters, further increasing CO₂ concentration and leading to acidification.

Freshwater Input: Tropical estuaries often receive high volumes of freshwater from riverine sources, especially during rainy seasons. This freshwater can lower buffering capacity (alkalinity) in the estuarine water, making it more vulnerable to pH changes.

Hypoxia and Acidification: In some nutrient-rich tropical estuaries, the decomposition of organic matter can lead to oxygen depletion (hypoxia). Low-oxygen conditions often coincide with acidification, as both result from high rates of organic matter breakdown, producing CO₂.

Capitã Cíntia Cardoso

Sim, os oceanos estão saturados de CO2 …. o ciclo biogeoquímico esta desregulado, com elevado níveis de co2 a água fica mais ácida…. isso estressa os corais e expulsam as zooxantelas que dão cor corais ( por isso ficam brancos e morrem). Com alteração na temperatura dos oceanos desregula a salinidade… altera o ciclo do nível trófico, os peixes migram… o aquecimento também altera as ressurgência… as correntes ….

Os fatores são bem claros … aquecimento global … elevados níveis de fósforo e nitrogênio … que dos rios chegam aos mares e causam eutrofização… isso consome oxigênio que já está escasso neste ambiente