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Temporal variability of atmospheric CO2 of the Spanish Atlantic Coast ArchiMer
Perez, Fiz F; Gago, Jesus; Alvarez, Marta; Rios, Aida F.
The variability of the molar fraction of atmospheric CO2 (xCO(2)(a)) and wind speed and direction were investigated in a coastal embayment located in the west European coast, ria de Vigo, NW Spain, along daily and seasonal time scales. Observations in the ria showed that xCO(2)(a) on a short time scale presented a much wider variability than seawater molar fraction (xCO(2)(w)), in addition, a significant covariation between xCO(2)(a) and wind was found. A sluggish atmospheric renewal due to weak winds was associated with high values of xCO(2)(a), whereas higher oceanic winds renovate the air column with more stable and constrained xCO(2)(a) values (from 350 to 370 ppm). The impact of anomalously high xCO(2)(a) on CO2 air-sea fluxes is practically not...
Tipo: Text Palavras-chave: Variabilité temporelle; CO2 atmosphérique; Échange air–mer; Côte atlantique espagnole; Temporal variability; Atmospheric CO2; Air-sea exchange; Spanish Atlantic Coast.
Ano: 2001 URL: http://archimer.ifremer.fr/doc/00322/43366/42849.pdf
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Uptake of Inorganic and Organic Nitrogen Sources by Dinophysis acuminata and D. acuta ArchiMer
García-portela, Maria; Reguera, Beatriz; Gago, Jesus; Le Gac, Mickael; Rodríguez, Francisco.
Dinoflagellate species of Dinophysis are obligate mixotrophs that require light, nutrients, and prey for sustained growth. Information about their nitrogenous nutrient preferences and their uptake kinetics are scarce. This study aimed to determine the preferred nitrogen sources in cultures of D. acuminata and D. acuta strains from the Galician Rías Baixas (NW Spain) and to compare their uptake kinetics. Well-fed versus starved cultures of D. acuminata and D. acuta were supplied with N15 labeled inorganic (nitrate, ammonium) and organic (urea) nutrients. Both species showed a preference for ammonium and urea whereas uptake of nitrate was negligible. Uptake rates by well-fed cells of D. acuminata and D. acuta were 200% and 50% higher, respectively, than by...
Tipo: Text Palavras-chave: Dinophysis; Nitrate; Ammonium; Urea; Uptake rates; N-15 incubations; Antibiotic treatment.
Ano: 2020 URL: https://archimer.ifremer.fr/doc/00606/71770/70250.pdf
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First observation on neustonic plastics in waters off NW Spain (spring 2013 and 2014) ArchiMer
Gago, Jesus; Henry, Maryvonne; Galgani, Francois.
This paper examines the presence and distribution of plastic particles in waters off the NW Spanish Atlantic coast. A pilot sampling program was initiated in 2013 to study the presence of plastic particles in surface waters. A total of 41 neuston samples were collected using a manta trawl fitted with a 333 μm mesh (21 samples in 2013 and 20 samples in 2014). Several types of plastic particles were observed in 95% of the stations. A total of 1463 plastic microparticles (<5 mm; mps) and 208 mesoparticles (>5 mm and <20 mm; MPS) were counted. Average concentrations recorded were 0.034 ± 0.032 and 0.176 ± 0.278 mps m−2 and 0.005 ± 0.005 and 0.028 ± 0.043 MPS m−2, respectively for 2013 and 2014. Results on this emerging topic are discussed as a...
Tipo: Text Palavras-chave: Marine litter; Floating plastics; Microplastics; European MSFD; NW Spain.
Ano: 2015 URL: http://archimer.ifremer.fr/doc/00275/38605/37469.pdf
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Microplastics in Seawater: Recommendations from the Marine Strategy Framework Directive Implementation Process ArchiMer
Gago, Jesus; Galgani, Francois; Maes, Thomas; Thompson, Richard C..
Microplastic litter is a pervasive pollutant present in marine systems across the globe. The legacy of microplastics pollution in the marine environment today may remain for years to come due to the persistence of these materials. Microplastics are emerging contaminants of potential concern and as yet there are few recognized approaches for monitoring. In 2008, the EU Marine Strategy Framework Directive (MSFD, 2008/56/EC) included microplastics as an aspect to be measured. Here we outline the approach as discussed by the European Union expert group on marine litter, the technical Subgroup on Marine litter (TSG-ML), with a focus on the implementation of monitoring microplastics in seawater in European seas. It is concluded that harmonization and coherence...
Tipo: Text Palavras-chave: Marine debris; Plastics; Microplastics; Monitoring.
Ano: 2016 URL: https://archimer.ifremer.fr/doc/00358/46932/46836.pdf
Registros recuperados: 4
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