Percorrer por autor "Serpa, Tiago Luís"
A mostrar 1 - 1 de 1
Resultados por página
Opções de ordenação
- In situ and satellite characterization of Meddies' structures in open Ocean NE Atlantic: NA-Vice Cruise (2012), Azores to icelandPublication . Serpa, Tiago Luís; Martins, Ana Maria de Pinho Ferreira da Silva Fernandes; Almeida, Paulo José Relvas deA meddy was found at 41.3º N 27.1º W during the R/V Knorr cruise KN207-03 that took place from the Azores to Iceland in the summer of 2012 within the framework of the international project NA-VICE. The meddy’s main physical properties and characteristics were identified using in situ data (CTD and ADCP) and salinity and temperature anomalies of 0.24 and 2.18ºC, respectively, were found as well as azimuthal velocities up to 0.35 m s-1 . These values were compared with criteria described by previous authors to ensure that this structure, which was further north than most observations, could be classified as a meddy. Meanwhile, a cyclonic eddy with characteristics from Mediterranean Water (MW) was also found to interact with the meddy, and their relationship was discussed. Afterwards, the meddy’s surface expression was analysed using altimetry data combined with an eddy detection algorithm, and it was found that its Sea Level Anomaly (SLA) was 15 cm, and it presented a 100 km radius. This data was used to track the meddy’s path, giving a general idea of the generation and dissipation dates and locations, leading to the hypothesis that the locations previously identified by other authors do not encompass all the possible meddy generation sites. A new method was tested using satellite Ocean Colour (OC) images to identify meddies surface expression. Despite the previously known Sea Surface Temperature (SST) surface expression, the results show that other valuable parameters such as Chlorophyll-a (Chlor-a), kd_490, Particulate Organic Carbon (POC), and Particulate Inorganic Carbon (PIC) are equally important, emphasising the vital role of the meddies in the mixing and transport of biogeochemical properties in the ocean and how this has been underestimated.