Dataset Information

Carbon dioxide emissions from estuaries of northern and northeastern Brazil.

ABSTRACT: 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 (FCO?) and the partial pressure of CO? (pCO?) values in 28 estuarine environments at a variety of spatial scales in the northern and northeastern regions of Brazil. The results showed a mean FCO? (water to air) of 55 ± 45?mmol·m(-2)·d(-1). Additionally, a negative correlation between dissolved oxygen saturation and pCO? was observed, indicating a control by biological processes and especially by organic matter degradation. This leads to increased dissolved CO? concentration in estuarine waters which results in a pCO? that reached 8,638??atm. Our study suggests that northern and northeastern Brazilian estuaries act as sources of atmospheric CO?. The range of pCO? 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 pCO? have been detected.

SUBMITTER: Noriega C

PROVIDER: S-EPMC4650900 | biostudies-other | 2014

REPOSITORIES: biostudies-other

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Carbon dioxide emissions from estuaries of northern and northeastern Brazil.

Noriega Carlos C Araujo Moacyr M

Scientific reports 20140822

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 (pCO₂) 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). ...[more]

PMID: 25145418

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Project description:Anthropogenic carbon dioxide emissions are the main cause of global climate change. The COVID-19 pandemic has been one of the worst of its kind in the last century with regard to global deaths and, in the absence of any effective treatment, it led to governments worldwide mandating lock-down measures, as well as citizens voluntarily reducing non-essential trips and activities. In this study, the influence of decreased activity on CO2 emissions and on the economy was assessed. The US, EU-28, China and India, representing almost 60% of anthropogenic carbon emissions, were considered as reference entities and the trends were extrapolated to estimate the global impact. This study aimed to deduce initial estimates of anthropogenic CO2 emissions based on the available economic and industrial outputs and activity data, as they could not be directly measured. Sector-wise variations in emissions were modeled by assuming proportionality of the outputs/activities and the resulting emissions. A decline in road traffic was seen up to March 2020 and then a steady growth was observed, with the exception of China where road traffic started to recover by the end of January. The vast majority of passenger flights were grounded and, therefore, global air traffic plummeted by 43.7% from January to May 2020. A considerable drop in coal power production and the annual industrial growth rate was also observed. The overall economic decline led to a drop of 4.9% in annual global gross domestic product (GDP) for Q2 2020. The total global CO2 emissions reduction for January through April 2020 compared to the year before was estimated to be 1749 Mt. CO2 (14.3%) with a maximum contribution from the transportation sector (58.3% among total emissions by sector). Like other previous crises, if the economy rebounds as expected the reductions will be temporary. Long-term impacts can be minimized considering the business as well as lifestyle changes for travel, utilizing virtual structures created during this crisis, and switching to sustainable transportation.

Dataset Information

Carbon dioxide emissions from estuaries of northern and northeastern Brazil.

Publications

Carbon dioxide emissions from estuaries of northern and northeastern Brazil.

Similar Datasets

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