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This study was carried out using a floating accumulation chamber, which to the best of our knowledge, has only been applied to lacustrine environments.<\/jats:p><jats:p>A survey was carried out in the crater lagoon in August 2017, resulting in a total of 143 CO<jats:sub>2<\/jats:sub>flux measurements. Other parameters, such as water temperature, pH, electrical conductivity, and depth, were also determined at each measuring point, covering a study area of 0.02 km<jats:sup>2<\/jats:sup>. At one of the deepest sites with higher CO<jats:sub>2<\/jats:sub>flux values, water samples were collected at depth for determination of stable isotopic composition.<\/jats:p><jats:p>Water temperatures ranged between 21.0 and 27.0 \u00b0C, pH from 8.24 to 8.89, and electrical conductivity from 52.5 to 53.9 mS\/cm. As expected, due to the marine water composition, sampled waters are of the Na-Cl type. CO<jats:sub>2<\/jats:sub>flux varied between 0.581 and 1.0 g m<jats:sup>-2<\/jats:sup>d<jats:sup>-1<\/jats:sup>(average = 2.967 g m<jats:sup>-2<\/jats:sup>d<jats:sup>-1<\/jats:sup>). A single CO<jats:sub>2<\/jats:sub>population, characterized by low CO<jats:sub>2<\/jats:sub>fluxes, points to a biogenic CO<jats:sub>2<\/jats:sub>origin (\u03b4<jats:sup>13<\/jats:sup>C = \u22129.62\u2030). The estimated value for the total CO<jats:sub>2<\/jats:sub>emitted from the water surface is 0.05 t d<jats:sup>-1<\/jats:sup>. CO<jats:sub>2<\/jats:sub>flux measurements were also compared with the structural features that cross the tuff cone, but no clear relation was observed with fractures\/faults.<\/jats:p><jats:p>This methodology should be applied to other coastal marine areas, especially where anomalous gas emissions have been reported.<\/jats:p>","DOI":"10.1007\/s00445-023-01639-y","type":"journal-article","created":{"date-parts":[[2023,4,4]],"date-time":"2023-04-04T12:19:23Z","timestamp":1680610763000},"update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["Quantification of diffuse CO2 flux emission from the crater lagoon of Vila Franca do Campo Islet (S\u00e3o Miguel, Azores)"],"prefix":"10.1007","volume":"85","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-5793-1987","authenticated-orcid":false,"given":"C\u00e9sar","family":"Andrade","sequence":"first","affiliation":[]},{"given":"Vittorio","family":"Zanon","sequence":"additional","affiliation":[]},{"given":"F\u00e1tima","family":"Viveiros","sequence":"additional","affiliation":[]},{"given":"J Virg\u00edlio","family":"Cruz","sequence":"additional","affiliation":[]},{"given":"Adriano","family":"Pimentel","sequence":"additional","affiliation":[]},{"given":"Rui","family":"Coutinho","sequence":"additional","affiliation":[]}],"member":"297","published-online":{"date-parts":[[2023,3,31]]},"reference":[{"key":"1639_CR1","doi-asserted-by":"publisher","first-page":"55","DOI":"10.1016\/S0377-0273(03)00391-3","volume":"133","author":"A Aiuppa","year":"2004","unstructured":"Aiuppa A, Caleca A, Federico C, Gurrieri S, Valenza M (2004) Diffuse degassing of carbon dioxide at Somma-Vesuvius volcanic complex (Southern Italy) and its relation with regional tectonics. 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