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Investigating daytime and night-time differences with the seasonal trend and sources of inorganic fine aerosols in Indo-Gangetic plain

  • S Chandra
  • M J KulshresthaEmail author
  • B Kumar
  • R K Kotnala
Article
  • 35 Downloads

Abstract

This study investigates the seasonal distribution of inorganic aerosols in Central New Delhi and identifies their potential source regions using concentration weighted trajectories (CWTs). Secondary inorganic aerosols (\(\hbox {NO}_{3}^{-}\), \(\hbox {SO}_{4}^{2-}\), \(\hbox {NH}_{4}^{+})\) are the largest contributors to fine particulate matter in New Delhi, India. The concentrations of secondary inorganic aerosols showed very distinct seasonal patterns with higher concentrations in winter and post-monsoon seasons. Inorganic ions \(\hbox {Ca}^{2+}\), \(\hbox {Mg}^{2+}\) and \(\hbox {K}^{+}\) were also examined to understand their temporal trends. The primary aerosols were found to have smaller diurnal differences than secondary aerosols. The higher coefficient of divergence for secondary aerosols indicated a significant difference in their chemistry and/or meteorology during daytime and night-time, respectively. The backward trajectory analysis revealed the advection of ionic species from distant sources responsible for their significant seasonality. The highest concentrations of \(\hbox {K}^{+}\) during the post-monsoon season were mainly influenced by air masses arriving from Punjab and Haryana regions resulting from the prominent agricultural crop residue burning in these areas. CWT also identified the Thar Desert and Punjab as potential regions for enhanced levels of \(\hbox {Ca}^{2+}\) and \(\hbox {K}^{+}\), respectively. Also, the brick kilns located in western UP were observed as the major potential sources for \(\hbox {NO}_{3}^{-}\) and \(\hbox {SO}_{4}^{2-}\).

Keywords

\(\hbox {PM}_{2.5}\) water-soluble inorganic species secondary aerosols coefficient of divergence concentration weighted trajectory 

Notes

Acknowledgements

The authors are grateful to the Director, CSIR–NPL, for his encouragement and providing facilities to carry out this research work. One of the authors, S Chandra gratefully acknowledge CSIR fellowship. Benefits of scientific discussions with Prof. J J Schauer, University of Wisconsin, Madison, USA and Prof. U C Kulshrestha, Jawaharlal Nehru University, New Delhi, India, are gratefully acknowledged. The authors are thankful to the editor and anonymous reviewers for improving the quality of this paper.

Supplementary material

12040_2018_1064_MOESM1_ESM.doc (221 kb)
Supplementary material 1 (doc 220 KB)

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Copyright information

© Indian Academy of Sciences 2019

Authors and Affiliations

  • S Chandra
    • 1
    • 3
  • M J Kulshrestha
    • 1
    Email author
  • B Kumar
    • 2
  • R K Kotnala
    • 1
  1. 1.CSIR–National Physical LaboratoryNew DelhiIndia
  2. 2.Jawaharlal Nehru UniversityNew DelhiIndia
  3. 3.Vivekananda College, University of DelhiDelhiIndia

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