eng URI http://hdl.handle.net/10795/2045 earth sciences meteorology climatology environmental monitoring climate change atmospheric pollution The objective of this study is the investigation of the large scale variability of the atmospheric circulation over the Mediterranean region in relation to the Indian summer monsoon. For this purpose composite anomalies of selected fields at various isobaric levels are analyzed for strong versus weak monsoon years. Gridded, monthly mean data, such as geopotential height, horizontal wind components, vertical velocity and relative vorticity at 300 hPa were used, as obtained from the ERA-40 Reanalysis Data Base, with 2.5 2.5 resolution for the boreal summer (June-September) and for a 44-year period (1958–2001). The standardized Dynamic Indian Monsoon Index by Wang and Fan (1999) was employed to determine the strong and weak monsoon years in the 44-year period. It was found that there are significant differences between strong and weak composites for all fields, especially in the upper troposphere. The results suggest that these differences may be related to the existence of Rossby wave trains as well as to the intensity and the meridional shift of the upper-level jet streams. 8 pp. LOMv1.0 creator LOMv1.0 publisher LOMv1.0 Scientific Coordinator LOMv1.0 Project Final Beneficiary LOMv1.0 Project Executing Organisation 2012 Digital Library of the Operational Programme "Education and Lifelong Learning" abstract types Text Mediterranean region Indian summer Monsoon Rossby wave trains Seasonal anomalies http://link.springer.com/chapter/10.1007/978-3-642-29172-2_99 536821 application/pdf http://repository.edulll.gr/edulll/bitstream/10795/2045/2/2045_chp%253A10.1007%252F978-3-642-29172-2_99.pdf Η παρουσίαση της παραπάνω εργασίας έγινε προφορικά στις 31 Μαΐου 2012 στα πλαίσια του 11ου Διεθνούς Συνεδρίου Μετεωρολογίας, Κλιματολογίας και Φυσικής της Ατμόσφαιρας (COMECAP 2012), που πραγματοποιήθηκε την περίοδο 29 Μαΐου – 1 Ιουνίου 2012 στην Αθήνα URI http://hdl.handle.net/10795/2045 LOMv1.0creator 2016-02-19T14:36:07Z LOMv1.0validator 2016-02-19T14:36:07Z LOMv1.0 gre no no Copyright EYD-EPEDBM (Operational Programme "Education and Lifelong Learning")