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Lidar Atmospheric Studies in Armenia

#A-562


Studies of the Various Atmospheric Components and Parameters by Lidar Observations and Archive Investigations in the Latitude of Armenia

Tech Area / Field

  • ENV-APC/Air Pollution and Control/Environment
  • ENV-MIN/Monitoring and Instrumentation/Environment

Status
3 Approved without Funding

Registration date
24.07.2000

Leading Institute
Byurakan Astrophysical Observatory, Armenia, Byurakan

Collaborators

  • Service d'Aeronomie, France, Verrieres le Buisson

Project summary

The objective of the Project is to begin investigations at the Byurakan Observatory of the long-term evolution of the composition and temperature of the stratosphere in relation to ozone reduction. This will be performed in the framework of the international Network for Detection of Stratospheric Change (NDSC) with the support of the Service d’Aeronomie in France, which operates a NDSC primary station at Observatoire de Haute Provence.

The project includes the following stages:


- the production and setting of a lidar system at Byurakan for measuring temperature and aerosol from 30 to 80km;
- revision of 40 years of spectral plates, recorded at Byurakan for tentative derivation of past evolution of the atmospheric loading of nitrogen and bromine oxides, responsible for ozone depletion, which was totally unknown before the 80s.

The lidar system consists of a frequency doubled pulsed Nd-YAG laser emitting at 532nm, a transmitter telescope, a receiving system with 450-mm telescopes, a 2-channel analyzing system (detectors and electronics), one for high altitude range (30-80km) and one for low altitude range (15-50km), and a computer for data analysis and storage. The system is installed in a 6*2.5*2.5 meter shelter. The system was operated over 5 years in several European sites and must be refurbished at CNRS (laser, optics...) before being sent to Byurakan.

The past composition of the atmosphere will be investigated with a careful selection from the 11,000 existing plates at Byurakan, later digitized with existing equipment and processed with an adequate algorithm, derived from software available at CNRS.

In both cases, the project is based on the technical and scientific expertise of the Service d’Aeronomie in France, which has over 20 years’ experience with lidars, UV-visible spectrometry and NDSC activities and where Armenian technical and scientific staff will be trained.


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