Spatio-temporal pattern of Sea Surface Temperature in Northern Iberia Shelf
A time series analysis of Sea Surface Temperature (SST) data derived from the NOAA/NASA Advanced Very High Resolution Radiometer (AVHRR) Pathfinder V5 and MODIS (Moderate Resolution Imaging Spectroradiometer) Aqua data over the Northern Iberia Shelf (NIS) covering the period 1982-2012 was analyzed w...
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| Formato: | tesis de maestría |
| Fecha de publicación: | 2014 |
| País: | España |
| Recursos: | Universidad de Oviedo (UNIOVI) |
| Repositorio: | RUO. Repositorio Institucional de la Universidad de Oviedo |
| Idioma: | inglés |
| OAI Identifier: | oai:digibuo.uniovi.es:10651/27961 |
| Acesso em linha: | http://hdl.handle.net/10651/27961 |
| Access Level: | acceso abierto |
| Palavra-chave: | Spatio-temporal Sea Surface Temperature, R oceanographic Empirical Orthogonal Function Time series analysis remote sensing Principal components MODIS, AVHRR Pathfinder V5 |
| Resumo: | A time series analysis of Sea Surface Temperature (SST) data derived from the NOAA/NASA Advanced Very High Resolution Radiometer (AVHRR) Pathfinder V5 and MODIS (Moderate Resolution Imaging Spectroradiometer) Aqua data over the Northern Iberia Shelf (NIS) covering the period 1982-2012 was analyzed with Empirical Orthogonal Function (EOF) in order to define the spatial pattern, timing and relative magnitude of seasonal and interannual variability of SST. For the NIS, Principal Component number 1(PC1) accounted for more than 90% of the variability. The loadings showed a strong seasonal cyclic signal and the spatial scores a conspicuous gradient across the area of study. The combination of the pattern of the loadings and the scores reflected spatial differences in the amplitude of the SST seasonal signal. The strong seasonal signal was also observed at a larger scale in the Southeastern European Atlantic (SEA). The analysis of the spatial pattern in the Northern Iberian Shelf (NIS) indicated that SST during summer time at the western Iberian Shelf was lower and it increased along the Cantabrian shelf, becoming maximum at the inner Bay of Biscay. However, this process was reversed in winter, when temperature was maximum at the western Iberian shelf and it decreased towards the Cantabrian shelf and being minimum at the inner Bay of Biscay. This indicates that there existed a strong spatial and temporal variation of SST in the study area. The comparison between the NIS and the SEA allowed hypothesizing about the nature of the processes that may govern interannual variability in the NIS; i.e. similar variability in both areas could corresponded to large scale forcing processes, whereas differences between NIS and SEA could be indicative of the relative importance mesoscale processes in the NIS. The influence that the main mesoscale processes (i.e., coastal upwelling, the Iberian Polar Current, river runoff and the effect of the Bay of Biscay on thermal stratification) on the spatial differences in the seasonal signal and the interannual variability is discussed. |
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