Changes in surface UV solar irradiance and ozone over the Balkans during the eclipse of August 11, 1999

Zerefos, CS; Balis, DS; Zanis, P; Meleti, C; Bais, AF; Tourpali, K; Melas, D; Ziomas, I; Galani, E; Kourtidis, K; Papayannis, A; Gogosheva, Z

dc.contributor.author	Zerefos, CS	en
dc.contributor.author	Balis, DS	en
dc.contributor.author	Zanis, P	en
dc.contributor.author	Meleti, C	en
dc.contributor.author	Bais, AF	en
dc.contributor.author	Tourpali, K	en
dc.contributor.author	Melas, D	en
dc.contributor.author	Ziomas, I	en
dc.contributor.author	Galani, E	en
dc.contributor.author	Kourtidis, K	en
dc.contributor.author	Papayannis, A	en
dc.contributor.author	Gogosheva, Z	en
dc.date.accessioned	2014-03-01T01:16:13Z
dc.date.available	2014-03-01T01:16:13Z
dc.date.issued	2001	en
dc.identifier.issn	0273-1177	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/13982
dc.subject	Gravity Wave	en
dc.subject	Oscillations	en
dc.subject	Ozone	en
dc.subject	Solar Irradiance	en
dc.subject	Tropospheric Ozone	en
dc.subject	Intensity Measure	en
dc.subject.classification	Engineering, Aerospace	en
dc.subject.classification	Astronomy & Astrophysics	en
dc.subject.classification	Geosciences, Multidisciplinary	en
dc.subject.classification	Meteorology & Atmospheric Sciences	en
dc.subject.other	JULY 11	en
dc.subject.other	COSTA-RICA	en
dc.subject.other	GREECE	en
dc.title	Changes in surface UV solar irradiance and ozone over the Balkans during the eclipse of August 11, 1999	en
heal.type	journalArticle	en
heal.identifier.primary	10.1016/S0273-1177(01)00279-4	en
heal.identifier.secondary	http://dx.doi.org/10.1016/S0273-1177(01)00279-4	en
heal.language	English	en
heal.publicationDate	2001	en
heal.abstract	Intensive measurements of UV solar irradiance, total ozone and surface ozone were carried out during the solar eclipse of 11 August 1999 at Thessaloniki, Greece and Stara Zagora, Bulgaria, located very close to the footprint of the moon's shadow during the solar eclipse with the maximum coverage of the solar disk reaching about 90% and 96% respectively. It is shown that during the eclipse the diffuse component is reduced less compared to the decline of the direct solar irradiance at the shorter wavelengths. A 20-minute oscillation of erythemal UV-B solar irradiance was observed before and after the time of the eclipse maximum under clear skies, indicating a possible 20-minute fluctuation in total ozone presumably caused by the eclipse induced gravity waves. The surface ozone measurements at Thessaloniki display a decrease of around 10-15 ppbv during the solar eclipse. Similarly, ozone profile measurements with a lidar system indicate a decrease of ozone up to 2 km during the solar eclipse. The eclipse offered the opportunity to test our understanding of tropospheric ozone chemistry. The use of a chemical box model suggested that photochemistry can account for a significant portion of the observed surface ozone decrease. (C) 2001 COSPAR. Published by Elsevier Science Ltd. All rights reserved.	en
heal.publisher	ELSEVIER SCIENCE BV	en
heal.journalName	OZONE VARIATIONS OF SOLAR ORIGIN	en
heal.bookName	ADVANCES IN SPACE RESEARCH	en
dc.identifier.doi	10.1016/S0273-1177(01)00279-4	en
dc.identifier.isi	ISI:000172223600005	en
dc.identifier.volume	27	en
dc.identifier.issue	12	en
dc.identifier.spage	1955	en
dc.identifier.epage	1963	en