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

M. Komppula, T. Mielonen, A. Arola, K. Korhonen, H. Lihavainen, A. -P. Hyvarinen, H. Baars, R. Engelmann, D. Althausen, A. Ansmann, D. Mueller, T. S. Panwar, R. K. Hooda, V. P. Sharma, V. -M. Kerminen, K. E. J. Lehtinen, Y. Viisanen

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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 Angstrom exponents (AE(ext)), indicating the presence of smaller probably absorbing particles. The winter had the lowest backscatter and extinction coefficients, but AE(ext) was the highest, suggesting still a large amount of small particles.

Original languageEnglish
Pages (from-to)4513-4524
Number of pages12
JournalAtmospheric Chemistry and Physics
Volume12
Issue number10
DOIs
Publication statusPublished - 2012

Keywords

  • SULFUR-DIOXIDE EMISSIONS
  • OPTICAL-PROPERTIES
  • QUALITY INTERACTIONS EUCAARI
  • PHYSICAL PARTICLE PROPERTIES
  • CLOUD CLIMATE
  • AIRBORNE LIDAR
  • 6-WAVELENGTH LIDAR
  • GLOBAL SCALES
  • OCEAN EXPERIMENT
  • EUROPEAN INTEGRATED PROJECT

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