Observations of stratosphere-to-troposphere transport events over the eastern Mediterranean using a ground-based lidar system

Galani, E; Balis, D; Zanis, P; Zerefos, C; Papayannis, A; Wernli, H; Gerasopoulos, E

dc.contributor.author	Galani, E	en
dc.contributor.author	Balis, D	en
dc.contributor.author	Zanis, P	en
dc.contributor.author	Zerefos, C	en
dc.contributor.author	Papayannis, A	en
dc.contributor.author	Wernli, H	en
dc.contributor.author	Gerasopoulos, E	en
dc.date.accessioned	2014-03-01T01:19:21Z
dc.date.available	2014-03-01T01:19:21Z
dc.date.issued	2003	en
dc.identifier.issn	0148-0227	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/15439
dc.subject	Eastern Mediterranean	en
dc.subject	Lidar	en
dc.subject	Ozone profiles	en
dc.subject	Stratospheric intrusions	en
dc.subject	STT	en
dc.subject.classification	Meteorology & Atmospheric Sciences	en
dc.subject.other	atmospheric transport	en
dc.subject.other	ground-based measurement	en
dc.subject.other	lidar	en
dc.subject.other	ozone	en
dc.subject.other	potential vorticity	en
dc.subject.other	relative humidity	en
dc.subject.other	stratosphere-troposphere interaction	en
dc.subject.other	Central Macedonia	en
dc.subject.other	Eurasia	en
dc.subject.other	Europe	en
dc.subject.other	Greece	en
dc.subject.other	Southern Europe	en
dc.subject.other	Thessaloniki	en
dc.title	Observations of stratosphere-to-troposphere transport events over the eastern Mediterranean using a ground-based lidar system	en
heal.type	journalArticle	en
heal.identifier.primary	10.1029/2002JD002596	en
heal.identifier.secondary	8527	en
heal.identifier.secondary	http://dx.doi.org/10.1029/2002JD002596	en
heal.language	English	en
heal.publicationDate	2003	en
heal.abstract	[1] In order to cover a substantial amount of stratospheric intrusions during the project Influence of Stratosphere-Troposphere Exchange in a Changing Climate on Atmospheric Transport and Oxidation Capacity ( STACCATO), coordinated measurements were carried out at several locations in central and southern Europe, based on quasi-operational stratosphere-troposphere exchange forecasts. In this context, lidar measurements of tropospheric ozone were performed at Thessaloniki (23 degreesE, 40.5 degreesN), Greece, for the investigation of stratosphere-to-troposphere transport (STT) events over the southeastern Mediterranean region, during 2000-2002. The study of STT in this area is of particular interest not only because of its geographic location, which is more southern than the typical position of the polar front jet, but also because of the sparseness of detailed studies in this area. A summary of the main characteristics of the STT events that were detected by lidar during the investigation period reveals a tropospheric ozone increase of the order of 10% between 4.5 and 6.5 km above sea level, a coincident decrease in relative humidity, and elevated values of potential vorticity, thus providing a direct indication of the occurrence of stratospheric air in the middle troposphere. No direct effect on surface ozone was recorded. Furthermore, the majority of the STT cases detected reveal a common pathway of the stratospheric air masses that reached Thessaloniki originating from the North Sea. In addition, the event of 9 January 2001, during which the clearest and strongest descent of stratospheric air occurred, is further analyzed. An ozone-rich layer of the order of 60-90 ppbv between 5 and 6.5 km above sea level is clearly depicted, which was the result of the intermixture of originally stratospheric and boundary layer air originating from North America.	en
heal.publisher	AMER GEOPHYSICAL UNION	en
heal.journalName	Journal of Geophysical Research D: Atmospheres	en
dc.identifier.doi	10.1029/2002JD002596	en
dc.identifier.isi	ISI:000182875800001	en
dc.identifier.volume	108	en
dc.identifier.issue	12	en
dc.identifier.spage	STA 12	en
dc.identifier.epage	1 - STA 12-10	en