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| Titel |
Sampling of an STT event over the Eastern Mediterranean region by lidar and electrochemical sonde |
| VerfasserIn |
A. Papayannis, D. Balis, P. Zanis, E. Galani, H. Wernli, C. Zerefos, A. Stohl, S. Eckhardt, V. Amiridis |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
0992-7689
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| Digitales Dokument |
URL |
| Erschienen |
In: Annales Geophysicae ; 23, no. 6 ; Nr. 23, no. 6 (2005-09-15), S.2039-2050 |
| Datensatznummer |
250015287
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| Publikation (Nr.) |
 copernicus.org/angeo-23-2039-2005.pdf |
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| Zusammenfassung |
A two-wavelength ultraviolet (289–316nm) 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.
Keywords. Atmospheric composition and structure (Evolution
of the atmosphere; Instruments and techniques) – Meteorology
and atmospheric dynamics (Middle atmosphere dynamics;
Turbulence) |
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