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Discussion papers | Copyright
https://doi.org/10.5194/acp-2018-637
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 02 Jul 2018

Research article | 02 Jul 2018

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This discussion paper is a preprint. It is a manuscript under review for the journal Atmospheric Chemistry and Physics (ACP).

New Particle Formation at a High Altitude Site in India: Impact of Fresh Emissions and Long Range Transport

Vyoma Singla, Subrata Mukherjee, Adam Kristensson, Govindan Pandithurai, Kundan K. Dani, and Vasudevan Anil Kumar Vyoma Singla et al.
  • Indian Institute of Tropical Meteorology, Pune

Abstract. There is a lack of characterization of the aerosol population in Western India, how it is affected by meteorological parameters, and new particle formation and the influence on cloud condensation nuclei (CCN). For this reason, measurements of particle number size distribution, aerosol chemical composition, meteorology and cloud condensation nuclei number concentration were monitored at High Altitude Cloud Physics Laboratory (HACPL) in Mahabaleshwar mountain town in Western India between November 2016 and February 2017. Most air masses in this period originated from the Indian continent to the north-east of HACPL. New particle formation (NPF) events were observed on 47 days and mainly associated with these north-easterly air masses and high SO2 emissions and biomass burning activities, while weaker or non-NPF days were associated with westerly air masses and relatively higher influence of local air pollution. The growth of newly formed particles enhanced the mass concentration of secondary organic and inorganic species of aerosol particles. The mean growth rate, formation rate, condensation sink and coagulation loss for the 13 strongest events was found to be 2.58±0.38nmh−1, 2.82±1.37cm−3s−1, 22.3±2.87*10-3s−1 and 1.62±1.04cm−3s−1 respectively. A closer examination of 5 events showed that low relative humidity and solar radiation favoured new particle formation. These NPF events lead to a significant increase in CCN concentration (mean ~53±36%). The NanoMap method revealed that NPF took place up to several hundred kilometers upwind and to the north-east of HACPL.

Vyoma Singla et al.
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