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Aerosol size and chemical characteristics at Mumbai, India, during the INDOEX-IFP (1999)

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Title Aerosol size and chemical characteristics at Mumbai, India, during the INDOEX-IFP (1999)
 
Creator VENKATARAMAN, C
REDDY, CK
JOSSON, S
REDDY, MS
 
Subject sea-salt sulfate
atmospheric aerosols
elemental carbon
source identification
southern california
hong-kong
nitrate
particle
air
distributions
pm-10
aerosol size distributions
bc
oc
ions
trace elements
 
Description Aerosol size and chemical characteristics govern their optical and radiative effects and their potential for cloud nucleation. This paper reports the size and chemical characteristics of surface aerosols measured at Mumbai during the Indian Ocean Experiment-Intensive Field Phase (INDOEX-IFP), January-March 1999. Carbonaceous (30%) and ionic (20%) constituents contributed significantly to aerosol mass. High black carbon concentrations and a low organic to black carbon ratio implied the predominance of primary carbonaceous aerosol, while a high nss-sulphate contribution in the fine mode, suggested a probable anthropogenic origin. Non-sea-salt potassium (nss-K(+)) and black carbon concentrations correlated during January and early February, with nss-K(+) in the fine mode contributing 86% of totalK(+), implying a common origin from a local biomass-burning source. Crustal sources were dominant during late-February and March, with 69% of the aerosol mass present in the coarse mode, and 60% of the variation in PM-10 measured during 12:00-16:00 h being explained by a crustal source factor. Chloride depletion was estimated throughout the study, more significantly during January and early February, from the higher RH and lower Ca(2+)/Na(2+) ratios. A negative correlation was obtained of chloride with nitrate, indicating probable nitrate substitution. During late-February and March, nitrate correlated with calcium suggesting an association with soil. Nss-sulphate correlated with calcium but not sodium, implying a probable association with crustal aerosols. (C) 2002 . .
 
Publisher PERGAMON-ELSEVIER SCIENCE LTD
 
Date 2011-08-23T10:57:53Z
2011-12-26T12:56:25Z
2011-12-27T05:45:09Z
2011-08-23T10:57:53Z
2011-12-26T12:56:25Z
2011-12-27T05:45:09Z
2002
 
Type Article
 
Identifier ATMOSPHERIC ENVIRONMENT, 36(12), 1979-1991
1352-2310
http://dx.doi.org/10.1016/S1352-2310(02)00167-X
http://dspace.library.iitb.ac.in/xmlui/handle/10054/10495
http://hdl.handle.net/10054/10495
 
Language en