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

被引:43
作者
Zerefos, CS [1 ]
Balis, DS
Zanis, P
Meleti, C
Bais, AF
Tourpali, K
Melas, D
Ziomas, I
Galani, E
Kourtidis, K
Papayannis, A
Gogosheva, Z
机构
[1] Aristotle Univ Thessaloniki, Lab Atmospher Phys, Thessaloniki, Greece
[2] Natl Tech Univ Athens, GR-10682 Athens, Greece
[3] Astron Inst, Stara Zagora, Bulgaria
来源
OZONE VARIATIONS OF SOLAR ORIGIN | 2001年 / 27卷 / 12期
关键词
D O I
10.1016/S0273-1177(01)00279-4
中图分类号
V [航空、航天];
学科分类号
08 ; 0825 ;
摘要
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.
引用
收藏
页码:1955 / 1963
页数:9
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