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  Infrequent occurrence of new particle formation at a semi-rural location, Gadanki, in tropical Southern India

Kanawade, V. P., Shika, S., Pöhlker, C., Rose, D., Suman, M. N. S., Gadhavi, H., et al. (2014). Infrequent occurrence of new particle formation at a semi-rural location, Gadanki, in tropical Southern India. Atmospheric Environment, 94, 264-273. doi:10.1016/j.atmosenv.2014.05.046.

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Kanawade, V. P.1, Author
Shika, S.1, Author
Pöhlker, C.2, Author              
Rose, D.2, Author              
Suman, M. N. S.1, Author
Gadhavi, H.1, Author
Kumar, Ashwini3, Author              
Shiva Nagendra, S. M.1, Author
Ravikrishna, R.1, Author
Yu, Huan1, Author
Sahu, L. K.1, Author
Jayaraman, A.1, Author
Andreae, M. O.3, Author              
Pöschl, U.2, Author              
Gunthe, S. S.1, Author
Affiliations:
1external, ou_persistent22              
2Multiphase Chemistry, Max Planck Institute for Chemistry, Max Planck Society, ou_1826290              
3Biogeochemistry, Max Planck Institute for Chemistry, Max Planck Society, ou_1826286              

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 Abstract: We report first measurements of ultrafine particles from a semi-rural location, Gadanki, from tropical Southern India. Measurements of particle number size distributions in the diameter range of 5 nm-32 mu m were performed during 2 May-31 July 2012. The mean number concentrations of nucleation (N-NUC), Aitken (N-AIT), accumulation (N-ACCU), and total particles (N-TOT) at this site were (1.1 +/- 0.9) x 10(3) cm(-3), (2.2 +/- 1.3) x 10(3) cm(-3), (1.5 +/- 1.2) x 10(3) cm(-3) and (4.8 +/- 2.4) x 10(3) cm(-3), respectively, comparable to other rural to semi-rural locations globally and declined as the season progressed, perhaps due to wet removal of aerosols with onset of monsoon in early June. Particle bursts in the nucleation mode size range (5-25 nm), followed by a sustained growth in size were observed very rarely (only 5 out of 79 observation days) at this site, less frequently than at most other locations around the world during May-July. Most factors affecting new particle formation (NPF) were similar on NPF and nonNPF event days, such as condensation sink, relative humidity, temperature, wind speed and direction, and mixing layer height. Thus, the infrequent occurrence of NPF at our site appeared to be linked to lower precursor gas concentrations and weak gas-phase oxidation chemistry due to diminished solar radiation on persistently cloudy days with the onset of the monsoon in early June over this region. The derived particle growth rates (GR > 5 nm) and formation rates of 5 nm particles (J(5)) ranged from 2.2 to 4.7 nm h(-1) and 0.4-2.4 cm(-3) s(-1), with a mean and standard deviation of 3.4 +/- 0.9 nm h(-1) and 12 +/- 2.3 cm(-3) s(-1), respectively, comparable to previous investigations at rural to semi-rural locations. The observed behavior in aerosol and meteorological parameters on NPF and nonNPF event days appeared to be distinctive compared to other rural to urban locations across the globe. However, this distinct behavior is limited and restricted to this site and season of the year, and should therefore not be generalized over a larger spatio-temporal scale. This emphasizes the need for long-term aerosol and precursor measurements over this and other regions of India. (C) 2014 Elsevier Ltd. All rights reserved.

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 Dates: 2014-09
 Publication Status: Published in print
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Title: Atmospheric Environment
Source Genre: Journal
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Publ. Info: Oxford [England] : Pergamon
Pages: - Volume / Issue: 94 Sequence Number: - Start / End Page: 264 - 273 Identifier: ISSN: 1352-2310
CoNE: https://pure.mpg.de/cone/journals/resource/958480288336