Climatology via applied satellite remote sensing : chlorophyll blooms in the North Aegean Sea

• Κύριος συγγραφέας: Γεωργακάς, Κωνσταντίνος
• Άλλοι συγγραφείς: Παπαθεοδώρου, Γεώργιος
• Μορφή: Thesis
• Γλώσσα: English
• Έκδοση: 2014
• Θέματα: Climatology; Satellite remote sensing; Sea air interactions; Chlorophyll-a; Algae blooms; North Aegean Sea; Oceanography; Κλιματολογία; Δορυφορική τηλεπισκόπιση; Αλληλεπιδράσεις θάλασσα αέρα; Χλωροφύλλη-α; Εξάρσεις χλωροφύλλης; Βόρειο Αιγαίο; Ωκεανογραφία; 579.8

The current study focuses on the phenomenon, mostly accounted within the past recent time, of the algae blooms (chlorophyll burst) in the area of the North Aegean Sea. The study attempts to coincide and amplify the approach of Satellite Remote Sensing monitoring, as means of applied oceanographic methods, in order for possible seasonal, spatio-temporal trends of this phenomenon to be identified, thus making the correlation of the indices-variations, though interdisciplinary, to be explained to an extend plainly, in terms of ‘why’ and ‘why-then’ they occur. The North Aegean Sea is directly influenced by the outflow of the Black Sea water masses, through the Dardanelles Strait. Secondary, riverine discharge is into account, along with special hydrodynamic characteristics of the basin. This Black Sea contribution to the North Aegean basin is cold, brackish and rather rich in biomass and nutrients and via the eutrophic blooms, fluctuate the relative meso-poor nutrient character of the basin. The environmental impacts and causes of the occurrences have a multidisciplinary analysis. They affect local ecology systems, water quality, coastal regions, the ichtyo-stock, the eco-balance on food-dependable species and ultimately the human health. The current study leans emphasis on the meteorological-oceanographic analysis for the algae blooms in the North Aegean Sea, depending on the use of satellite derived data and optical color imaginary, concerning the area under study. The preliminary concern, along with secondary conclusions, among the variable instability of the local biogeochemical recycling of the phenomenon, the prolonged temporal time of its dispersion and its correlation with surface winds and meteo-characteristics, was verified. Data from Giovanni, that is a Web-based application developed by the GES DISC (Goddard Earth Sciences Data and Information Services Center) Interactive Online Visualization ANd aNalysis Infrastructure-NASA, where used for the analysis, in order for possible correlations between oceanographic and meteorological variables to be identified, such as: Chlorophyll-a concentrations, Precipitations rates, Euphotic Zone Depth, Colored Dissolved Organic Matter, Absorption coefficient for phytoplankton, Sea Level Pressure, Surface Pressure and Northwards wind component.