Abstract
During the STAAARTE 96 Hellen aircraft campaign the lidar ALTO together with in situ measurements examined the ozone and aerosols variability in the lower troposphere over the Eastern Mediterranean region. Ozone mean value in the free troposphere (FT) measured from ALTO was 48 ppb, while it was 45 ppb from in situ observations; the aerosols mean scattering coefficient (550 nm) was 31 Mm-1. The FT ozone distributions of the two instruments are significantly different to distinct sampling. Air masses origin examination using the FLEXPART model for low and high FT ozone observations during late summer indicate that low ozone masses come from Mediterranean/North Africa regions travelling at low altitude, while high ozone masses emanate from Europe’s middle or upper troposphere.
Highlights
In the Mediterranean region air masses with different origin are found creating an atmospheric crossroads
The number of the studies focusing in the free troposphere (FT) ozone in the area is limited (e.g. [3]), mainly using either models, which are affected by the emissions uncertainties or satellites, which do not provide the required vertical resolution to observe ozone layers e.g. [4]
The main instrument on board the aircraft was the lidar ALTO, a UV differential absorption lidar (DIAL) system based on Nd:YAG laser and stimulated Raman scattering in deuterium to generate three wavelengths (266, 289 and 316 nm) in order to measure ozone and aerosols profiles [5]
Summary
The STAAARTE (Scientific Training and Access to Aircraft for Atmospheric Research Throughout Europe) Hellen 96 airborne campaign took place during the period 19-26 September 1996 over Greece (Fig. 1, Tab. 1). In the Mediterranean region air masses with different origin are found creating an atmospheric crossroads.
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
