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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union
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Discussion papers
https://doi.org/10.5194/amt-2019-437
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/amt-2019-437
© Author(s) 2019. This work is distributed under
the Creative Commons Attribution 4.0 License.

Submitted as: research article 20 Dec 2019

Submitted as: research article | 20 Dec 2019

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Measurement Techniques (AMT).

Solar radiometer sensing of multi-year aerosol features over a tropical urban station: Direct Sun and inversion products

Katta Vijayakumar1, Panuganti C. S. Devara2, Sunil M. Sonbawne3, David M. Giles4,5, Brent N. Holben5, Sarangam Vijaya Bhaskara Rao1, and Chalicheemalapalli K. Jayasankar1 Katta Vijayakumar et al.
  • 1Department of Physics, Sri Venkateswara University (SVU), Tirupati 517502, India
  • 2Amity Centre for Ocean-Atmospheric Science and Technology (ACOAST); Amity Centre for Environmental Science and Health (ACESH) & Amity School of Earth and Environmental Sciences (ASEES), Amity University Haryana, Manesar-Gurugram, 122413, India
  • 3Indian Institute of Tropical Meteorology (IITM), Pune 411008, India
  • 4Science Systems and Applications (SSA), Inc., Lanham, MD 20706, USA
  • 5NASA Goddard Space Flight Center (GSFC), Greenbelt, MD 20771, USA

Abstract. The AErosol RObotic NETwork (AERONET) is the most developed ground-based network for aerosol remote-sensing and has been playing a significant role not only in monitoring air quality for protecting human health but also in assessing the radiative budget of our planet Earth. In this paper, we report the direct sun and inversion products, comprising of spectral variation of Aerosol Optical Depth (AOD), associated Ångström Exponent (AE), fine- and coarse-mode aerosol fractions, Aerosol Size Distribution (ASD), Refractive Index (RI), Asymmetry Parameter (AP), Single Scattering Albedo (SSA), Aerosol Radiative Forcing (ARF), and columnar concentration of gas constituents such as water vapor, ozone and nitrogen peroxide, obtained from a Cimel sun-sky radiometer, functioning at Pune, India, under the AERONET program since October 2004. These long-term measurements carried out from 2005 to 2015 could serve as an urban aerosol optical long-term average or climatology The AOD long-term variations at all wavelengths, considered in the study, exhibited increasing trend, implying year-to-year enhancement in aerosol loading. The mean seasonal variations in AOD from cloud-free days indicated greater values during monsoon, revealing dominance of hygroscopic aerosol particles over the station. Contribution by different aerosol types to AOD has also been deduced, discussed and found dominance of mixed type of aerosols (43.79 %), followed by combination of biomass burning and urban industrial aerosols (22.03 %) compared to other types of aerosols during the study period. The long-term data sets, derived aerosol and trace gas products play a significant role in understanding aerosol climate forcing, trends, and evaluation of regional air pollution and validation of aerosol transport models over the study region.

Katta Vijayakumar et al.
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Data sets

Sun-Sky Radiometer–Derived Column-Integrated Aerosol Optical and Physical Properties over a Tropical Urban Station during 2004–2009 K. Sumit, P. C. S. Devara, K. K. Dani, S. M. Sonbawne, and S. K. Saha https://doi.org/10.1029/2010JD014944

Katta Vijayakumar et al.
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Short summary
The direct sun and inversion products of urban atmospheric aerosols, obtained from a Cimel sun-sky radiometer at Pune, India, under the AERONET program since October 2004, have been reported in this paper. The mean seasonal variations in AOD from cloud-free days indicated greater values during monsoon, revealing dominance of hygroscopic aerosols over the station. Such results are sparse in India, and are important for estimating aerosol radiative forcing, and for validation of climate models.
The direct sun and inversion products of urban atmospheric aerosols, obtained from a Cimel...
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