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Annales Geophysicae An interactive open-access journal of the European Geosciences Union
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Volume 23, issue 10
Ann. Geophys., 23, 3219–3227, 2005
https://doi.org/10.5194/angeo-23-3219-2005
© Author(s) 2005. This work is distributed under
the Creative Commons Attribution 3.0 License.
Ann. Geophys., 23, 3219–3227, 2005
https://doi.org/10.5194/angeo-23-3219-2005
© Author(s) 2005. This work is distributed under
the Creative Commons Attribution 3.0 License.

  30 Nov 2005

30 Nov 2005

Spatial characteristics of aerosol physical properties over the northeastern parts of peninsular India

K. Niranjan1, B. Melleswara Rao1, P. S. Brahmanandam1, B. L. Madhavan1, V. Sreekanth1, and K. Krishna Moorthy2 K. Niranjan et al.
  • 1Department of Physics, Andhra University, Visakhapatnam 530 003, India
  • 2Space Physics Laboratory, Vikram Sarabhai Space Centre, Trivandrum 695 022, India

Abstract. Measurements on aerosol spectral optical depths and near surface mass-size distributions made at several locations in the states of Andhra Pradesh, Orissa and Chattisgarh, constituting the northeastern part of the peninsular India during the ISRO-GBP land campaign-I show significant regional variations in aerosol physical properties. Higher spectral optical depths were observed in the coastal regions and over southern latitudes compared to interior continental regions and northern latitudes. The optical depths, size index "α" and the near surface aerosol mass concentrations indicate a relative abundance of nucleation mode aerosols in the northern latitudes, in contrast to the dominance of the accumulation mode aerosols at the eastern coastal and southern latitudes. The airmass pathways derived from the back trajectory analysis indicate that the higher aerosol population in the accumulation mode, and consequently the higher optical depths in the southern locations, could be due to the transport of aerosol from the polluted north Indian regions via the oceanic region over the Bay of Bengal, where significant particle growth is expected, increasing the population of accumulation mode aerosols over these regions.

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