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Environmental Science and Pollution Research

, Volume 25, Issue 15, pp 14868–14881 | Cite as

Observation of optical properties and sources of aerosols at Buddha’s birthplace, Lumbini, Nepal: environmental implications

  • Dipesh RupakhetiEmail author
  • Shichang KangEmail author
  • Maheswar Rupakheti
  • Zhiyuan Cong
  • Lekhendra Tripathee
  • Arnico K. Panday
  • Brent N. Holben
Research Article

Abstract

For the first time, aerosol optical properties are measured over Lumbini, Nepal, with CIMEL sunphotometer of the Aerosol Robotic Network (AERONET) program. Lumbini is a sacred place as the birthplace of Lord Buddha, and thus a UNESCO world heritage site, located near the northern edge of the central Indo-Gangetic Plains (IGP) and before the Himalayan foothills (and Himalayas) to its north. Average aerosol optical depth (AOD) is found to be 0.64 ± 0.38 (0.06–3.28) over the sampling period (January 2013–December 2014), with the highest seasonal AOD during the post-monsoon season (0.72 ± 0.44). More than 80% of the daily averaged AOD values, during the monitoring period, are above 0.3, indicating polluted conditions in the region. The levels of aerosol load observed over Lumbini are comparable to those observed at several heavily polluted sites in the IGP. Based on the relationship between AOD and Ångstrom exponent (α), anthropogenic, biomass burning, and mixed aerosols are found to be the most prevalent aerosol types. The aerosol volume-size distribution is bi-modal during all four seasons with modes centered at 0.1–0.3 and 3–4 μm. For both fine and coarse modes, the highest volumetric concentration of ~ 0.08 μm−3 μm−2 is observed during the post-monsoon and pre-monsoon seasons. As revealed by the single-scattering albedo (SSA), asymmetry parameter (AP), and refractive index (RI) analyses, aerosol loading over Lumbini is dominated by absorbing, urban-industrial, and biomass burning aerosols.

Keywords

Aerosol optical depth Ångstrom exponent Indo-Gangetic Plain Lumbini Himalayas Nepal 

Notes

Acknowledgements

Maheswar Rupakheti acknowledges the support provided by the Institute for Advanced Sustainability Studies (IASS) which is funded by the German Federal Ministry for Education and Research (BMBF) and the Brandenburg Ministry for Science, Research and Culture (MWFK). The authors acknowledge Christoph Cüppers and Michael Pahlke of the Lumbini International Research Institute (LIRI) for providing the space and power to run the instruments at the LIRI premises and Bhogendra Kathayat and Bhoj Raj Bhatta for their support in the operation of the site.

Funding information

This study is supported by National Natural Science Foundation of China (41630754 and 41721091), Chinese Academy of Sciences (QYZDJ-SSW-DQC039) and the State Key Laboratory of Cryospheric Science (SKLCS-ZZ-2017). Dipesh Rupakheti is supported by CAS-TWAS President’s Fellowship for International PhD Students.

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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Key Laboratory of Tibetan Environment Changes and Land Surface Processes, Institute of Tibetan Plateau ResearchChinese Academy of SciencesBeijingChina
  2. 2.University of Chinese Academy of SciencesBeijingChina
  3. 3.State Key Laboratory of Cryospheric Science, Northwest Institute of Eco-Environment and ResourcesChinese Academy of SciencesLanzhouChina
  4. 4.Center for Excellence in Tibetan Plateau Earth SciencesChinese Academy of SciencesBeijingChina
  5. 5.Institute for Advanced Sustainability Studies (IASS)PotsdamGermany
  6. 6.Himalayan Sustainability Institute (HIMSI)KathmanduNepal
  7. 7.International Centre for Integrated Mountain Development (ICIMOD)LalitpurNepal
  8. 8.NASA Goddard Space Flight CenterGreenbeltUSA

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