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Lidar stations in Tajikistan

#T-2036


Atmospheric stations in Tajikistan dedicated to gas-aerosol pollution monitoring using automatic sun-photometer and micro-LIDAR

Tech Area / Field

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

Status
3 Approved without Funding

Registration date
17.09.2012

Leading Institute
Physical Technical Institute of the Academy of Sciences of Republic Tajikistan, Tajikistan, Dushanbe

Collaborators

  • School of Earth and Atmospheric Science , Georgia Institute of Technology, USA, GA, Atlanta\nUniversite de Lille, France, Lille\nNASA / Goddard Space Flight Center, USA, MD, Greenbelt

Project summary

Projected climate warming will most likely negatively affect the ecosystems of the whole Central Asia region. More than 60% of fresh water of Central Asia is accumulated in the glaciers of Tajikistan, a small country compared to the whole region. Climate warming will yield further desertification and cause more frequent dust storms that will increase dust loads in the atmosphere, yielding larger deposition fluxes of dust particle on glaciers. During the implementation of the ISTC T-1000 and T-1688 projects, increasing concentration of radioactive isotope were discovered in some of glaciers near the borders of China, India and Pakistan resulting from nuclear tests conducted by these countries. In some instances, concentrations of the radiogenic isotopes exceed the mean value across the Central Asia region by 100 times. This result confirms that high mountain glaciers are a major sink of atmospheric particulates, collecting not only radioactive isotopes but also dust and soot particles.
PROJECT OBJECTIVES:
Establishing co-located sun-photometer and micro-LIDAR observation facility in the high mountain region Anzob. The sun-photometer will be integrated into the AERONET federation. This will be done through the European and French branch under the banner of AERONET-EUROPE in the framework of the ACTRIS (FP-7 infrastructure project). The micro-LIDAR will be included in the network currently developed by LOA. These will contribute to the development of an atmospheric gas-aerosol monitoring system in arid and high mountain regions; research on removal process, transformation and transport of dust particles in relation with the desertification of the region; research on chemical, elemental, and radioisotope composition of dust particles; and assessment of the impact of dust storms on climate, glaciers and other ecosystems.
PROJECT SCOPE
  • Establish the co-located sunphotometer/micro-LIDAR station in the Dushanbe (Latitude 380, 33’N , Longitude 680, 47’E , Elevation 810m ) for conducting the following measurements:
- Aerosol parameters for deriving local climatology of Aerosol Optical Depth (AOD) in UV, visible and NIR spectra (340, 380, 440, 500, 675, 870, 936, 1020, and 1640 nm);
- Water vapor (cm);
- Angstrom parameter in 440-870nm;
- Derived AOD Modes (Fine and Coarse Mode fraction); Size distribution in the range r = 0,015-15 m;
- Single scattering albedo in = 400-1100nm;
- Refractive index (Real part) as a function of ; Refractive index (Imaginary part) as a function of ;
- Aerosol optical depth absorption and aerosol optical extinction as a function of ,
- Aerosol phase function and estimate of extinction-to-backscatter (Lidar ratio)
  • Receiving of aerosol properties (column integrated) measured at station Dushanbe (Latitude 380, 33’N , Longitude 680, 47’E , Elevation 810m ).
  • Assess the aerosol vertical distribution in Dushanbe (characteristics, variability, origin of transported particles).
  • Analyze of variations of greenhouse gases (CO2, O3, Water vapor) in the atmosphere of arid, urban and high mountain regions in Tajikistan and their influence on climate change.
  • Analyze changes in the solar radiation (global, direct and diffuse components, aerosol radiative forcings) and earth surface albedo.
  • Research on processes controlling the emission, transport and sedimentation of aerosols resulting from dust storms, including analyses of seasonal and inter-annual variations.
  • Multipurpose, complex investigation of optics, radiation and chemical properties of aerosols in arid and high mountain zones having dust-laden atmospheric conditions.
EXPECTED RESULTS
The project clearly aims at providing, for the first time, a long-term, continuous and readily accessible public domain database of aerosol optical, microphysical and radiative properties for aerosol research and characterization, validation of satellite retrievals, and synergism with other database. One of the most promising results is the vertical profiling of aerosols that will be possible thank to co-located automatic sunphotometer and –micro-LIDAR.
  • In the Laboratory of Physics of Atmosphere of Physical-Technical Institute of Academy of Sciences of the Republic of Tajikistan, a unique and relevant system will be established at a new AERONET station coupled with micro-LIDAR observations in station Dushanbe (Latitude 380, 33’N , Longitude 680, 47’E , Elevation 810m ). which will enable the monitoring of the major state components affecting the environment and climate, with the emphasis on atmospheric aerosols (dust and pollution).
  • Investigation of the main drivers of climate change: variations of greenhouse gases (O3, Water vapor ,CO2,) in the atmosphere of arid, urban and high mountain regions of Tajikistan and changes in the solar radiation (global, direct and diffuse components) and earth surface albedo.
  • Based on the proposed research, a model will be developed to represent the processes of generation, transport, transformation and sedimentation of aerosols.
  • Analysis of the physical-chemical aerosol properties will be carried out with the objective of collecting data for determining the formation, transformation and transport pathways of aerosol particles originating from dust storms and in the polluted atmosphere of arid, high mountain zone of Tajikistan.


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