Sampling of an STT event over the Eastern Mediterranean region by lidar and electrochemical sonde

Papayannis, A; Balis, D; Zanis, P; Galani, E; Wernli, H; Zerefos, C; Stohl, A; Eckhardt, S; Amiridis, V

dc.contributor.author	Papayannis, A	en
dc.contributor.author	Balis, D	en
dc.contributor.author	Zanis, P	en
dc.contributor.author	Galani, E	en
dc.contributor.author	Wernli, H	en
dc.contributor.author	Zerefos, C	en
dc.contributor.author	Stohl, A	en
dc.contributor.author	Eckhardt, S	en
dc.contributor.author	Amiridis, V	en
dc.date.accessioned	2014-03-01T01:23:02Z
dc.date.available	2014-03-01T01:23:02Z
dc.date.issued	2005	en
dc.identifier.issn	0992-7689	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/16779
dc.subject	Atmospheric composition and structure (Evolution of the atmosphere	en
dc.subject	Instruments and techniques)	en
dc.subject	Meteorology and atmospheric dynamics (Middle atmosphere dynamics	en
dc.subject	Turbulence)	en
dc.subject.classification	Astronomy & Astrophysics	en
dc.subject.classification	Geosciences, Multidisciplinary	en
dc.subject.classification	Meteorology & Atmospheric Sciences	en
dc.subject.other	atmospheric chemistry	en
dc.subject.other	lidar	en
dc.subject.other	middle atmosphere	en
dc.subject.other	mixing ratio	en
dc.subject.other	ozone	en
dc.subject.other	troposphere	en
dc.subject.other	vertical profile	en
dc.subject.other	Mediterranean Region	en
dc.subject.other	Mediterranean Sea	en
dc.subject.other	oceanic regions	en
dc.subject.other	World	en
dc.title	Sampling of an STT event over the Eastern Mediterranean region by lidar and electrochemical sonde	en
heal.type	journalArticle	en
heal.identifier.primary	10.5194/angeo-23-2039-2005	en
heal.identifier.secondary	http://dx.doi.org/10.5194/angeo-23-2039-2005	en
heal.language	English	en
heal.publicationDate	2005	en
heal.abstract	A two-wavelength ultraviolet (289-316 nm) ozone Differential Absorption Lidar (DIAL) system is used to perform ozone measurements in the free troposphere in the Eastern Mediterranean (Northern Greece). The ozone DIAL profiles obtained during a Stratosphere-to-Troposphere Transport (STT) event are compared to that acquired by an electrochemical ozonesonde, in the altitude range between 2 and 10 km. The measurement accuracy of these two instruments is also discussed. The mean difference between the ozone profiles obtained by the two techniques is of the order of 1.11 ppbv (1.86%), while the corresponding standard deviation is 4.69 ppbv (8.16%). A case study of an STT event which occurred on 29 November 2000 is presented and analyzed, using ozone lidar, satellite and meteorological data, as well as air mass back-trajectory analysis. During this STT event ozone mixing ratios of 55-65 ppbv were observed between 5 and 7 km height above sea level (a.s.l.). Stratospheric air was mixed with tropospheric air masses, leading to potential vorticity (PV) losses due to diabatic processes. The ozone DIAL system can be used for following STT events and small-scale mixing phenomena in the free troposphere, and for providing sequences of vertical ozone profiles in the free troposphere. © European Geosciences Union 2005.	en
heal.publisher	EUROPEAN GEOSCIENCES UNION	en
heal.journalName	Annales Geophysicae	en
dc.identifier.doi	10.5194/angeo-23-2039-2005	en
dc.identifier.isi	ISI:000232558900007	en
dc.identifier.volume	23	en
dc.identifier.issue	6	en
dc.identifier.spage	2039	en
dc.identifier.epage	2050	en