Συμβολή στη μελέτη της αλληλεπίδρασης κατώτερης τροπόσφαιρας - επιφάνειας θάλασσας στις περιοχές της Μεσογείου και του βόρειου Ατλαντικού

• Main Authors: Lolis, Christos, Λώλης, Χρήστος
• Format: Doctoral or Postdoctoral Thesis
• Language: Greek
• Published: University of Ioannina 2002
• Subjects: Κλιματολογία; Παραγοντική ανάλυση; Ανάλυση κανονικής συσχέτισης; Τροπόσφαιρα; Κατώτερη; Επιφάνεια θάλασσας; Αλληλεπίδραση αέρα - Θάλασσας; Μεσόγειος Θάλασσα; Ατλαντικός; Βόρειος; Climatology; Factor analysis; Canonical correlation; Troposphere; Lower; Sea surface; Air - sea interaction; Mediterranean sea; Atlantic; North; Φυσικές Επιστήμες; Φυσική; Natural Sciences; Physical Sciences; North Atlantic; North Atlantic oscillation
• Online Access: http://hdl.handle.net/10442/hedi/14613; https://doi.org/10.12681/eadd/14613

The present PhD thesis is a contribution to the study of the sea surface – lower troposphere interactions. Various forms of these interactions were examined for two marine areas of different extent: the Mediterranean Sea and the North Atlantic Ocean. The multivariate statistical methods Factor Analysis and Canonical Correlation Analysis were applied on monthly anomalies of various climatic parameters for winter and summer. For the Mediterranean region, winter SST anomalies were found to be controlled by atmospheric circulation with a one-month time response. The so-called “Mediterranean Oscillation” was detected both for atmosphere and sea surface. The specific atmospheric circulation characteristics corresponding to the two phases of the above oscillation were examined. It was found also, that the sensible and latent heat fluxes are covariant to a high degree. These fluxes contribute to the formation and the deepening of the Mediterranean depressions and they are related to precipitation formation in the western windward areas of Greece. For summer, the “Mediterranean Oscillation” was not detected, while the response of SST was found to be very low because of the low thermal capacity of the surface sea waters. The combination between the Azores subtropical anticyclone and the South Asia thermal low modulates the temperature regime of the Mediterranean region. For the North Atlantic region, it was found that the “North Atlantic Oscillation” and the North Atlantic blocking anticyclones affect the temperature regime of the lower troposphere and the sea surface. The SST anomalies are controlled by atmospheric forcing with a time response of about two months. The sensible and latent heat fluxes are covariant to a high degree and they are directly linked to lower troposphere relative vorticity and consequently to the depression trajectories. For summer, the application of the methodology did not led to statistically significant results and did not detect any dominant mode of atmospheric or oceanic variability ...