Observations of particle number size distributions and new particle formation in six Indian locations

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dc.contributor.author Sebastian, Mathew
dc.contributor.author Kompalli, Sobhan Kumar
dc.contributor.author Kumar, Vasudevan Anil
dc.contributor.author Jose, Sandhya
dc.contributor.author Babu, S. Suresh
dc.contributor.author Pandithurai, Govindan
dc.contributor.author Singh, Sachchidanand
dc.contributor.author Hooda, Rakesh K.
dc.contributor.author Soni, Vijay K.
dc.contributor.author Pierce, Jeffrey R.
dc.contributor.author Vakkari, Ville
dc.contributor.author Asmi, Eija
dc.contributor.author Westervelt, Daniel M.
dc.contributor.author Hyvärinen, Antti-Pekka
dc.contributor.author Kanawade, Vijay P.
dc.date.accessioned 2022-05-09T14:04:04Z
dc.date.available 2022-05-09T14:04:04Z
dc.date.issued 2022
dc.identifier.uri http://hdl.handle.net/10138/343450
dc.description.abstract Atmospheric new particle formation (NPF) is a crucial process driving aerosol number concentrations in the atmosphere; it can significantly impact the evolution of atmospheric aerosol and cloud processes. This study analyses at least 1 year of asynchronous particle number size distributions from six different locations in India. We also analyze the frequency of NPF and its contribution to cloud condensation nuclei (CCN) concentrations. We found that the NPF frequency has a considerable seasonal variability. At the measurement sites analyzed in this study, NPF frequently occurs in March–May (pre-monsoon, about 21 % of the days) and is the least common in October–November (post-monsoon, about 7 % of the days). Considering the NPF events in all locations, the particle formation rate (JSDS) varied by more than 2 orders of magnitude (0.001–0.6 cm−3s−1) and the growth rate between the smallest detectable size and 25 nm (GRSDS-25 nm) by about 3 orders of magnitude (0.2–17.2 nm h−1). We found that JSDS was higher by nearly 1 order of magnitude during NPF events in urban areas than mountain sites. GRSDS did not show a systematic difference. Our results showed that NPF events could significantly modulate the shape of particle number size distributions and CCN concentrations in India. The contribution of a given NPF event to CCN concentrations was the highest in urban locations (4.3 × 103cm−3 per event and 1.2 × 103cm−3 per event for 50 and 100 nm, respectively) as compared to mountain background sites (2.7 × 103cm−3 per event and 1.0 × 103cm−3 per event, respectively). We emphasize that the physical and chemical pathways responsible for NPF and factors that control its contribution to CCN production require in situ field observations using recent advances in aerosol and its precursor gaseous measurement techniques.
dc.language.iso en
dc.publisher Copernicus Publ.
dc.relation.ispartofseries Atmospheric chemistry and physics
dc.rights CC BY 4.0
dc.subject particle formation
dc.subject observaition
dc.subject India
dc.subject atmosphere
dc.subject aerosol
dc.subject cloud process
dc.title Observations of particle number size distributions and new particle formation in six Indian locations
dc.format.volume 22
dc.format.issue 7
dc.identifier.urn URN:NBN:fi-fe2022050432729
dc.contributor.organization Ilmatieteen laitos fi
dc.contributor.organization Finnish Meteorological Institute en
dc.format.pagerange 4491-4508
dc.relation.doi 10.5194/acp-22-4491-2022
dc.relation.issn 1680-7316
dc.relation.issn 1680-7324
dc.type.okm A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä fi
dc.type.okm A1 Journal article (refereed), original research en

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