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标题：Carbon dioxide emissions from estuaries of northern and northeastern Brazil
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作者：Carlos Noriega ; Moacyr Araujo
期刊名称：Scientific Reports
电子版ISSN：2045-2322
出版年度：2014
卷号：4
DOI：10.1038/srep06164
出版社：Springer Nature
摘要：The carbon dioxide flux through the air–water interface of coastal estuarine systems must be quantified to understand the regional balance of carbon and its transport through adjacent coastal regions. We estimated and calculated the emissions of carbon dioxide (FCO₂) and the partial pressure of CO₂ ( p CO₂) values in 28 estuarine environments at a variety of spatial scales in the northern and northeastern regions of Brazil. The results showed a mean FCO₂ (water to air) of 55 ± 45 mmol·m⁻²·d⁻¹. Additionally, a negative correlation between dissolved oxygen saturation and p CO₂ was observed, indicating a control by biological processes and especially by organic matter degradation. This leads to increased dissolved CO₂ concentration in estuarine waters which results in a p CO₂ that reached 8,638 μatm. Our study suggests that northern and northeastern Brazilian estuaries act as sources of atmospheric CO₂. The range of p CO₂ observed were similar to those found in inner estuaries in other places around the world, with the exception of a few semi-arid estuaries (Köppen climate classification – BSh ) in which record low levels of p CO₂ have been detected.