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Impacts Of The High Loadings Of Primary And Secondary Aerosols On Light Extinction At Delhi During Wintertime | 18620
ISSN: 2157-7617
Journal of Earth Science & Climatic Change
Open Access
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High emissions of anthropogenic aerosols over Indo-Gangetic Plains (IGP) inspired continuous measurements of fine
particles (PM
2.5
), carbonaceous aerosols (BC, OC and EC), oxides of nitrogen (NOx) and estimation of light extinction
(b
ext
) and absorption (b
abs
) coefficients over Delhi during high pollution season in winter from December 2011 to March 2012.
During study period, the mass concentrations of PM
2.5
, BC and NOX were 186.5?149.7μg
m-3
, 9.6?8.5μg m
-3
and 23.8?16.1
ppb, respectively. The mass concentrations of OC and EC were studied by two different techniques (i) off-line (gravimetric
method) and (ii) semi-continuous (optical method) and their mean mass concentrations were 51.1?15.2, 10.4?5.5 μgm
-3
and
33.8?27.7, 8.2?6.2 μgm
-3
, respectively during the study period. The ratios of mass concentration of OC to EC in both cases
were in between 4 to 5. The source contribution of carbonaceous aerosols in PM
2.5
estimated over 24 hrs, during day- and
night-time where motor vehicles accounted for ~69%, 90% and 61% whereas coal combustion accounted for ~31%, 10%
and 39%, respectively. The estimated mean values of bext and babs over the station were 700.0?268.6 and 71.7?54.6 Mm
−1
,
respectively. In day and night analysis, bext is ~37% higher during night-time (863.4Mm
−1
) than in day-time (544.5 Mm
−1
).
Regression analysis between bext and visibility showed significant negative correlation (r=-0.85). The largest contribution in
the light extinction coefficients was found to be due to organic carbon (~46%), followed by elemental carbon (~24%), coarse
mode particles (~18%), ammonium sulfate (~8%) and ammonium nitrate (~4%). The individual analysis of light extinction
due to chemical species and coarse mode particles indicates that scattering type aerosols is dominated by ~76% over the
absorbing type. The aforementioned results suggest that the policy-induced control measures at local administration level are
needed to mitigate the excess emissions of carbonaceous aerosols over IGP region which ranks highest in India and elsewhere
in worldwide.
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