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How the Atmosphere over Eastern Himalaya, India is Polluted with Carbonyl Compounds? Temporal Variability and Identification of Sources

Category: Urban Air Quality

Volume: 17 | Issue: 9 | Pages: 2206-2223
DOI: 10.4209/aaqr.2017.01.0048
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Chirantan Sarkar1, Abhijit Chatterjee 1,2, Dipanjali Majumdar3, Arindam Roy1, Anjali Srivastava5, Sanjay K. Ghosh2,4, Sibaji Raha2,4

  • 1 Environmental Science Section, Bose Institute, Kolkata 700054, India
  • 2 National Facility on Astroparticle Physics and Space Science, Bose Institute, Darjeeling 734101, India
  • 3 National Environmental Engineering Research Institute, Kolkata 700107, India
  • 4 Center for Astroparticle Physics and Space Science, Kolkata 700091, India
  • 5 National Environmental Engineering Research Institute, Nagpur 440020, India

Highlights

First-ever year-long study on atmospheric carbonyls over a Himalayan station, India.
Carbonyls over eastern Himalaya were comparable with other cities of the world.
Secondary photochemical production and vehicular emission were major sources.
High meteorological influence on temporal variation of carbonyls was observed.


Abstract

A study was conducted on atmospheric carbonyl compounds for the first time over a Himalayan atmosphere in India. Samples were collected from a high altitude hill station, Darjeeling (27.01°N, 88.15°E, 2200 masl) during June 2012 to May 2013. Temporal variation, meteorological influence, source apportionment and ozone formation potential etc were studied for acetaldehyde, formaldehyde, acetone, butanaldehyde, propanaldehyde, benzaldehyde, crotonaldehyde, valeraldehyde, isovaleraldehyde, hexanaldehyde, p-tolualdehyde and o-tolualdehyde. High concentration of Acetone (81.6 ± 63.5 µg m–3) was observed which could be due to the higher photochemical production from its precursor volatile organic compounds emitted from tea plants and tea processing units. The concentration of acetaldehyde (20.7 ± 47.6 µg m–3) and formaldehyde (11.6 ± 16.3 µg m–3) were found to be comparable with metro cities of India and world. The average annual concentration of total carbonyl compounds was 174.2 ± 184.6 µg m–3 with maximum during postmonsoon (456.9 ± 199.5 µg m–3) and minimum during winter season (72.2 ± 42.9 µg m–3). Meteorological parameters like temperature and surface reaching solar radiative flux played the major roles for the seasonal variation of the carbonyl concentration over the hill station. The average ratio of formaldehyde to acetaldehyde over Darjeeling was found to be 1.64 ± 1.43 well representing a typical urban atmosphere at this part of Himalaya. Positive matrix factorization model showed that the biogenic emissions from tea plants and vehicular emissions were the major sources of carbonyl compounds over the hill station.

Keywords

Himalaya Carbonyl compound Principal component analysis Darjeeling


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