Ecological study of the aerosol optical characteristics and ozone concentration using lidar, radiometer and ozonemeter
(1) Bulgarian Academy of Sciences, Acad. G. Bonchev St. Block 3, 1113 Sofia, Bulgaria, 1113 Sofia, Bulgaria
I. Iliev, N. Kolev, I. Kolev, V. Grigorieva, T. Evgenieva, B. Kaprielov, V. Umlensky
The paper presents some results from the observation of the atmosphere over the urban area of the Sofia city. A scanning aerosol lidar, a optical multiwavelength radiometer, ozone meter and a ground meteorological station were used during the observation. The experiment aimed at: (i) concurring of the data obtained by the lidar, the radiometer and the ozone meter at particular meteorological conditions and (ii) estimating of the possibilities the air quality over an urban area to be determined on the basis of those data.
The time of the temperature inversions destruction, that of the convective boundary layer (CBL) formation, and the extinction coefficient in the planetary boundary layer are determined from the lidar data. The radiometer data give the spectral distribution of the solar radiation dispersed by the earth atmosphere. The ozone concentration is measured by the chemiluminescence technique.
The conception of the experiment is the air quality over the urban area to be estimated on the basis of a combined analysis of the lidar, radiometric, ozone meter and meteorological data. To determine the mixing layer height the lidar data are processed following the standard procedures. The aerosol extinction coefficient and its variation during the CBL formation are also determined. On the basis of the radiometric data an attempt is made of estimating the spectrum dependence of the extinction coefficient obtained from the aerosol optical characteristic in the atmosphere during the different stages of the CBL formation.The O3 variation detected is a manifestation of two processes: first formation of CBL and second the fast photochemical processes taking place in the ground layer under the influence of the changing solar irradiation.
Juxtaposing and analyzing the obtained results (lidar, radiometric, ozonemeter and meteorological) the possibility of quantitatively estimating the air quality using the combined remote active and passive apparatus is determined.
Keywords: ESA European
Space Agency - Agence spatiale europeenne,
observation de la terre, earth observation,
satellite remote sensing,
teledetection, geophysique, altimetrie, radar,
chimique atmospherique, geophysics, altimetry, radar,