Στατιστική μελέτη του ύψους του ατμοσφαιρικού οριακού στρώματος στην Αθήνα με χρήση ραδιοβολίσεων και τεχνικής lidar - Εφαρμογή φίλτρου Kalman

Αλεξίου, Δημήτριος; Alexiou, Dimitrios

dc.contributor.author	Αλεξίου, Δημήτριος	el
dc.contributor.author	Alexiou, Dimitrios	en
dc.date.accessioned	2018-10-04T08:56:23Z
dc.date.available	2018-10-04T08:56:23Z
dc.date.issued	2018-10-04
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/47705
dc.identifier.uri	http://dx.doi.org/10.26240/heal.ntua.15576
dc.rights	Default License
dc.subject	Φυσική περιβάλλοντος	el
dc.subject	Ατμοσφαιρικό οριακό στρώμα	el
dc.subject	Ατμοσφαιρική φυσική	el
dc.subject	Ραδιοβόλιση	el
dc.subject	Τηλεπισκόπιση	el
dc.subject	Kalman filter	en
dc.subject	Planetary boundary layer	en
dc.subject	Remote sensing	en
dc.subject	Atmospheric physics	en
dc.subject	Radiosondes	en
dc.title	Στατιστική μελέτη του ύψους του ατμοσφαιρικού οριακού στρώματος στην Αθήνα με χρήση ραδιοβολίσεων και τεχνικής lidar - Εφαρμογή φίλτρου Kalman	el
heal.type	bachelorThesis
heal.classification	Περιβαλλοντική τηλεπισκόπιση	el
heal.language	el
heal.access	campus
heal.recordProvider	ntua	el
heal.publicationDate	2018-02-26
heal.abstract	In this Diploma thesis we studied the temporal evolution of the Planetary Boundary Layer height (PBLH) over the basin of Athens during a 5-year period (2011-2016) using data from the EOLE Raman lidar system. The lidar data (range-corrected lidar signals- RCS) were selected around 12:00 UTC and 00:00 UTC for a total of 332 cases: 165 days and 167 nights. Extended Kalman filtering techniques were used for the determination of the PBLH. Moreover, several well established techniques for the PBLH estimation based on lidar data were also tested for a total of 48 cases. Comparisons with the PBLH values derived from radiosonde data were also performed. Chapter 1 is an introduction to the earthχs atmosphere. More precisely, a small description of the atmosphereχs structure and composition is given. Chapter 2 is a short theoretical background regarding the evolution of the planetary boundary layer (PBL). The definition of the PBL is also given. In Chapter 3, there is an extensive description of the instruments used in this thesis for the determination of PBLH along with their advantages and disadvantages and the geographic location of the study area of atmospheric interest. In chapter 4, we discuss the general characteristics of the classic methods that used for the determination of PBLH by radiosonde and lidar data. Also, the extended Kalman filtering technique (EKF) is described in detail. In chapter 5, we present PBL height comparisons between the lidar methods and the radiosoundings, for a sample of 48 cases, the most characteristic cases of the PBL for the area of Athens. More preciously, the correlation factors and the mean difference between the PBL heights estimated by methods based on lidar data and the PBL heights derived from radiosounding are given. Also the results of different lidar-based methods for the determination of PBL for some selected cases of clouds, dust, etesian, sea breeze, clear sky and nocturnal boundary layer with and without residual layer are discussed. In chapter 6, there is the statistical analysis of PBL estimated by EKF technique for a 5- year period (2011-2016). Mean PBLH and PBL growth rates for each season and month are presented. Correlation coefficients between the monthly PBL heights and the monthly temperature, solar radiation and precipitation respectively are given. Also there is a comparison of the PBLH and the PBL growth rates between cases with and without dust and between cases with and without etesian winds. Moreover, the results of this study with the results of others studies are discussed.This thesis is completed in the Chapter 7, presenting our conclusions and the corresponding future perspectives.	en
heal.advisorName	Παπαγιάννης, Αλέξανδρος	el
heal.committeeMemberName	Γιαννακάκη, Ελίνα	el
heal.committeeMemberName	Κόκκαλης, Παναγιώτης	el
heal.academicPublisher	Εθνικό Μετσόβιο Πολυτεχνείο. Σχολή Εφαρμοσμένων Μαθηματικών και Φυσικών Επιστημών. Τομέας Φυσικής	el
heal.academicPublisherID	ntua
heal.numberOfPages	102 σ.
heal.fullTextAvailability	true