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Bernardino M.,University of Lisbon | Bernardino M.,Portuguese Institute for the Sea and the Atmosphere IPMA | Guedes Soares C.,University of Lisbon
Maritime Technology and Engineering - Proceedings of MARTECH 2014: 2nd International Conference on Maritime Technology and Engineering | Year: 2015

A Lagrangian approach is used to study the characterization of the situations of extreme storms, monitoring the characteristics of each storm since their initiation to the dissipation, contrasting with the more usual Eulerian approach that only assesses the local conditions of waves. In order to assess the characteristics of the ocean storms of the 2013/2014 winter, this methodology was applied to three months of Era-interim significant wave height data. Ninety nine storms were identified and characterized regarding the maximum significant wave height in the track, the storm area associated with the maximum significant wave height, storm life time, time of maximum significant wave height arising, maximum area in the track, time of maximum area arising, length of the track, mean direction of track, arise length of track mean direction of track arising, decay length of the track, mean direction of track decay, in the North Atlantic, during this period. The characteristics of these storms are compared with the corresponding ones from a previous study that includes a ten year data set. The Hercules storm, that affected the western coast of Europe during early January is also analysed. © 2015 Taylor & Francis Group, London.

Cardoso C.,Portuguese Institute for the Sea and the Atmosphere IPMA | Ribeiro B.,Portuguese Institute for the Sea and the Atmosphere IPMA | Ribeiro B.,University of Lisbon | Mendes R.,Portuguese Institute for the Sea and the Atmosphere IPMA
Journal of Aquatic Food Product Technology | Year: 2015

The effects of microbial transglutaminase (MTGase; 5 g/kg, w/w) and dietary fiber (40 g pea fiber/kg product and 20 g carrageenan + 20 g konjac flour/kg product) on heat-induced meagre (Argyrosomus regius) gels with 25 and 10 g salt/kg, w/w were analyzed.MTGase addition increased the magnitude of texture variables. Inner pea fiber had an increasing effect on gel texture. The combination of carrageenan and konjac hardened meagre gels (from 22.2 ± 1.4 to 47.3 ± 4.5 N) and enhanced water-holding capacity. Salt reduction with MTGase ensured a gelling quality similar to that of gels from Alaska pollock surimi. © Copyright 2015 Taylor & Francis Group, LLC.

Hensen C.,Leibniz Institute of Marine Science | Scholz F.,Leibniz Institute of Marine Science | Nuzzo M.,IGI Ltd. | Nuzzo M.,Portuguese Institute for the Sea and the Atmosphere IPMA | And 17 more authors.
Geology | Year: 2015

We report on newly discovered mud volcanoes located at ~4500 m water depth ~90 km west of the deformation front of the accretionary wedge of the Gulf of Cadiz, and thus outside of their typical geotectonic environment. Seismic data suggest that fluid flow is mediated by a >400-km-long strike-slip fault marking the transcurrent plate boundary between Africa and Eurasia. Geochemical data (Cl, B, Sr, 87Sr/86Sr, δ18O, δD) reveal that fluids originate in oceanic crust older than 140 Ma. On their rise to the surface, these fluids receive strong geochemical signals from recrystallization of Upper Jurassic carbonates and clay-mineral dehydration in younger terrigeneous units. At present, reports of mud volcanoes in similar deep-sea settings are rare, but given that the large area of transform-type plate boundaries has been barely investigated, such pathways of fluid discharge may provide an important, yet unappreciated link between the deeply buried oceanic crust and the deep ocean. © 2015 Geological Society of America.

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