ACP Atmospheric Chemistry and Physics ACP 1680-7324 Copernicus GmbH Göttingen, Germany 10.5194/acp-12-4513-2012 Technical Note: One year of Raman-lidar measurements in Gual Pahari EUCAARI site close to New Delhi in India – Seasonal characteristics of the aerosol vertical structure Komppula M. 1 Mielonen T. 1 Arola A. 1 Korhonen K. 1 Lihavainen H. 2 Hyvärinen A.-P. 2 Baars H. 3 Engelmann R. 3 Althausen D. 3 Ansmann A. 3 Müller D. 3 4 8 Panwar T. S. 5 Hooda R. K. 2 5 Sharma V. P. 5 Kerminen V.-M. 2 6 Lehtinen K. E. J. 1 7 Viisanen Y. 2 Finnish Meteorological Institute, 70211 Kuopio, Finland Finnish Meteorological Institute, 00101 Helsinki, Finland Leibniz Institute for Tropospheric Research, 04318 Leipzig, Germany Atmospheric Remote Sensing Laboratory, Gwangju Institute of Science and Technology, Buk-Gu Gwangju 500-712, Republic of Korea The Energy and Resource Institute, Dabari Seth Block, IHC Complex, Lodhi Road, 110 003 New Delhi, India Department of Physics, P.O. Box 64, University of Helsinki, 00014 Helsinki, Finland Department of Applied Physics, University of Eastern Finland, 70211 Kuopio, Finland now at: Science Systems and Applications, Inc., MS 475 NASA Langley Research Center, Hampton, VA, 23681, USA 24 05 2012 12 10 4513 4524 This is an open-access article ditributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. This article is available from http://www.atmos-chem-phys.net/12/4513/2012/acp-12-4513-2012.html The full text article is available as a PDF file from http://www.atmos-chem-phys.net/12/4513/2012/acp-12-4513-2012.pdf

One year of multi-wavelength (3 backscatter + 2 extinction + 1 depolarization) Raman lidar measurements at Gual Pahari, close to New Delhi, were analysed. The data was split into four seasons: spring (March–May), summer (June–August), autumn (September–November) and winter (December–February). The vertical profiles of backscatter, extinction, and lidar ratio and their variability during each season are presented. The measurements revealed that, on average, the aerosol layer was at its highest in spring (5.5 km). In summer, the vertically averaged (between 1–3 km) backscatter and extinction coefficients had the highest averages (3.3 Mm<sup>−1</sup> sr<sup>−1</sup> and 142 Mm<sup>−1</sup> at 532 nm, respectively). Aerosol concentrations were slightly higher in summer compared to other seasons, and particles were larger in size. The autumn showed the highest lidar ratio and high extinction-related Ångström exponents (AE<sub>ext</sub>), indicating the presence of smaller probably absorbing particles. The winter had the lowest backscatter and extinction coefficients, but AE<sub>ext</sub> was the highest, suggesting still a large amount of small particles.

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