caa a22 4500 469084235 CHVBK 20180323133000.0 cr unu---uuuuu 170328e19920201xx s 000 0 eng 10.1007/BF02656932 doi (NATIONALLICENCE)springer-10.1007/BF02656932 Atmospheric NO2 concentration measurements using differential absorption lidar technique [Elektronische Daten] [P. Devara, P. Raj] Using the Differential Absorption Lidar (DIAL) technique, two types of approaches, namely, reflection from retroreflector / topographic target and backscatter from atmosphere, are available for studying remotely the atmospheric NO2 concentration. The Argon ion lidar system at the Indian Institute of Tropical Meteorology (IITM), Pune, India has been used for the measurements by following both the path-averaged and range-resolved approaches. For the former, a topographic target (hill) is used for determining path-averaged surface concentration. In the latter, spectral properties of atmospheric attenuation is used for making range-resolved measurements in the surface layer. The results of the observations collected by following both approaches are presented. The average surface NO2 concentration was found to vary between 0.01 and 0.105 ppm and the range-resolved measurements exhibited higher values suggesting treatment of the lidar data for scattering and extinction effects due to atmospheric aerosols and air molecules, and atmospheric turbulence. Certain modifications that are suggested to the experimental set-up, data acquisition and analysis to improve the measurements are briefly described. Advances in Atmospheric Sciences, 1992 Devara P. Indian Institute of Tropical Meteorology, 411 008, Pune, India aut Raj P. Indian Institute of Tropical Meteorology, 411 008, Pune, India aut Advances in Atmospheric Sciences Science Press 9/1(1992-02-01), 73-82 0256-1530 9:1<73 1992 9 376 https://doi.org/10.1007/BF02656932 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF02656932 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Devara P. Indian Institute of Tropical Meteorology, 411 008, Pune, India aut NATIONALLICENCE 700 1- Raj P. Indian Institute of Tropical Meteorology, 411 008, Pune, India aut NATIONALLICENCE 773 0- Advances in Atmospheric Sciences Science Press 9/1(1992-02-01), 73-82 0256-1530 9:1<73 1992 9 376 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer