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Observations of new particle formation at two distinct Indian subcontinental urban locations

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Title Observations of new particle formation at two distinct Indian subcontinental urban locations
 
Creator KANAWADE, VP
TRIPATHI, SN
SIINGH, D
GAUTAM, AS
SRIVASTAVAC, AK
KAMRA, AK
SONI, VK
SETHI, V
 
Subject Particle size distribution
Ultrafine particles
Formation rate
Growth
Urban
ATMOSPHERIC AEROSOL NUCLEATION
CONTINENTAL BOUNDARY-LAYER
SIZE DISTRIBUTION DATA
SULFURIC-ACID
FORMATION EVENTS
MODE PARTICLES
GLOBAL CCN
PO VALLEY
GAS-PHASE
SMEAR-II
 
Description While the formation of new atmospheric aerosol particles and their subsequent growth have been observed under diverse environmental conditions globally, such observations are very scarce over Indian subcontinent. Here, we present the systematic analysis for new particle formation (NPF) from two distinct urban locations in India during April-May of two consecutive years. Particle size distributions were measured at Pune (18.53 degrees N, 73.85 degrees E) during 16 April-23 May, 2012 and at Kanpur (26.46 degrees N, 80.32 degrees E) during 16 April-23 May, 2013. The campaign mean total particle number concentration in the similar size range of 4-135 nm at Pune (12.2 x 10(3) cm(-3)) was higher than at Kanpur (7.9 x 10(3) cm(-3)), whereas the estimated total condensation sink (CS4-750) at Pune (16.2 x 10(-3) s(-1)) was lower than at Kanpur (33.3 x 10(-3) s(-1)). Despite lower particle number concentrations at Kanpur, larger particle sizes resulted in higher condensation sink than at Pune. The mean particle mode diameter at Kanpur was found larger by a factor of similar to 1.8 than at Pune. NPF events were observed commonly at both sites, with lower frequency at Kanpur (14%) than that at Pune (26%). The derived particle growth rates, GR, and the formation rates of 5 nm particles, J(5), ranged from 3.4 to 133 nm h(-1) and 0.4 to 13.9 cm(-3) s(-1), respectively, which are generally comparable to typical values reported in previous studies. Generally, the particle growth rates were found higher at Kanpur, whereas the formation rates were higher at Pune. It appears that the presence of pre-existing large particles at Kanpur than at Pune suppressed formation rates and favored particle growth. Overall, NPF occurred at lower condensation sink, lower RH, higher solar radiation, and higher temperature. (C) 2014 Elsevier Ltd. All rights reserved.
 
Publisher PERGAMON-ELSEVIER SCIENCE LTD
 
Date 2014-12-28T16:42:21Z
2014-12-28T16:42:21Z
2014
 
Type Article
 
Identifier ATMOSPHERIC ENVIRONMENT, 96370-379
1352-2310
1873-2844
http://dx.doi.org/10.1016/j.atmosenv.2014.08.001
http://dspace.library.iitb.ac.in/jspui/handle/100/16912
 
Language English