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Title: 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
Authors: Komppula, M.Mielonen, T.Arola, A.Korhonen, K.Lihavainen, H.Hyvärinen, A.-P.Baars, H.Engelmann, R.Althausen, D.Ansmann, A.Müller, D.Panwar, T. S.Hooda, R. K.Sharma, V. P.Kerminen, V.-M.Lehtinen, K. E. J.Viisanen, Y.
Publishers Version: https://doi.org/10.5194/acp-12-4513-201
Issue Date: 2012
Published in: Atmospheric Chemistry and Physics, Volume 12, Issue 10, Page 4513-4524
Publisher: München : European Geopyhsical Union
Abstract: 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−1 sr−1 and 142 Mm−1 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 (AEext), indicating the presence of smaller probably absorbing particles. The winter had the lowest backscatter and extinction coefficients, but AEext was the highest, suggesting still a large amount of small particles.
Keywords: aerosol; aerosol composition; backscatter; extinction coefficient; lidar; Raman spectroscopy; seasonal variation; vertical profile
DDC: 550
License: CC BY 3.0 Unported
Link to License: https://creativecommons.org/licenses/by/3.0/
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