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Sulphate aerosol size distributions at Mumbai, India, during the INDOEX-FFP (1998)

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Title Sulphate aerosol size distributions at Mumbai, India, during the INDOEX-FFP (1998)
 
Creator VENKATARAMAN, C
SINHA, P
BAMMI, S
 
Subject general-circulation model
sea-salt
atmospheric aerosols
particulate sulfate
marine aerosol
coastal site
cloud albedo
trace gases
sulfur
particles
sources
seasonal variation
urban/coastal site
indian ocean experiment
regional climate
 
Description Sulphate size distributions were measured at the coastal station of Mumbai (formerly Bombay) through 1998, during the Indian ocean experiment (INDOEX) first field phase (FFP), to fill current gaps in size-resolved aerosol chemical composition data. The paper examines meteorological, seasonal and source-contribution effects on sulphate aerosol and discusses potential effects of sulphate on regional climate. Sulphate size-distributions were largely trimodal with a condensation mode (mass median aerodynamic diameter or M MAD 0.6 mum), a droplet mode (M MAD 1.9-2.4 mum) and a coarse mode (MMAD 5 mum) Condensation mode sulphate mass-fractions were highest in winter, consistent with the high meteorological potential for gas-to-particle conversion along with low relative humidity (RH). The droplet mode concentrations and MMADs were larger in the pre-monsoon and winter than in monsoon, implying sulphate predomi nance in larger sized particles within this mode. In these seasons the high RH, and consequently greater aerosol water in the droplet mode, would favour aerosol-phase partitioning and reactions of SO2. Coarse mode sulphate concentrations were lowest in the monsoon, when continental contribution to sulphate was low and washout was efficient. In winter and pre-monsoon, coarse mode sulphate concentrations were somewhat higher, likely from SO2 gas-to-particle conversion. Low daytime sulphate concentrations with a large coarse fraction, along with largely onshore winds, indicated marine aerosol predominance. High nighttime sulphate concentrations and a coincident large fine fraction indicated contributions from anthropogenic/industrial sources or from gas-to-particle conversion. Monthly mean sulphate concentrations increased with increasing SO2 concentrations, RH and easterly wind direction, indicating the importance of gas-to-particle conversion and industrial sources located to the east. Atmospheric chemistry effects on sulphate size distributions in Mumbai, indicated by this data, must be further examined. (C) 2001 . .
 
Publisher PERGAMON-ELSEVIER SCIENCE LTD
 
Date 2011-08-26T17:51:35Z
2011-12-26T12:57:33Z
2011-12-27T05:43:14Z
2011-08-26T17:51:35Z
2011-12-26T12:57:33Z
2011-12-27T05:43:14Z
2001
 
Type Article
 
Identifier ATMOSPHERIC ENVIRONMENT, 35(15), 2647-2655
1352-2310
http://dx.doi.org/10.1016/S1352-2310(00)00440-4
http://dspace.library.iitb.ac.in/xmlui/handle/10054/11394
http://hdl.handle.net/10054/11394
 
Language en