One year of Raman-lidar measurements in Gual Pahari EUCAARI site close to New Delhi in India: seasonal characteristics of the aerosol vertical structure M. Komppula1, T. Mielonen1, A. Arola1, K. Korhonen1, H. Lihavainen2, A.-P. Hyvärinen2, H. Baars3, R. Engelmann3, D. Althausen3, A. Ansmann3, D. Müller3,4, T. S. Panwar5, R. K. Hooda5, V. P. Sharma5, V.-M. Kerminen2, K. E. J. Lehtinen1, and Y. Viisanen2 1Finnish Meteorological Institute, 70211 Kuopio, Finland 2Finnish Meteorological Institute, 00101 Helsinki, Finland 3Leibniz Institute for Tropospheric Research, 04318 Leipzig, Germany 4Atmospheric Remote Sensing Laboratory, Gwangju Institute of Science and Technology, Buk-Gu Gwangju 500-712, Republic of Korea 5The Energy and Resource Institute, Dabari Seth Block, IHC Complex, Lodhi Road, 110 003 New Delhi, India
Received: 06 Sep 2010 – Accepted: 06 Dec 2010 – Published: 22 Dec 2010
Abstract. One year of multi-wavelength (3+2) Raman lidar measurements at Gual Pahari,
close to 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 with 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.
Citation: 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., and Viisanen, Y.: One year of Raman-lidar measurements in Gual Pahari EUCAARI site close to New Delhi in India: seasonal characteristics of the aerosol vertical structure, Atmos. Chem. Phys. Discuss., 10, 31123-31151, doi:10.5194/acpd-10-31123-2010, 2010.