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| Titel |
Atmospheric organic aerosols in the Indo-Gangetic Plain: A synthesis |
| VerfasserIn |
Manmohan Sarin, Prashant Rajput |
| Konferenz |
EGU General Assembly 2016
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 18 (2016) |
| Datensatznummer |
250126121
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| Publikation (Nr.) |
 EGU/EGU2016-5801.pdf |
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| Zusammenfassung |
| Large-scale dispersal of atmospheric pollutants from biomass burning emissions (BBEs) and
fossil-fuel combustion (FFc) sources in the Indo-Gangetic Plain (IGP); and a thick layer of
haze advecting to the Bay of Bengal (BoB) is a conspicuous seasonal feature under
favourable meteorological conditions during the wintertime (December-March). Our
sustained studies in the source region of north-west-IGP have provided significant new
understanding based on diagnostic ratios of OC/EC (10±2), WSOC/OC (0.52±0.02),
nss-K+/OC (0.60±0.03) and ∑
PAHs/EC (1.3±0.2 mg/g) emitted from agricultural-waste
(paddy-residue) burning in October-November that are significantly different from FFc
sources. On average, organic aerosols account for ∼ 63 % and inorganic species about 23 %
of PM2.5; whereas abundance of EC is no more than 4 %. Therefore, scattering species
(organic and inorganic) have dominant impact on regional atmospheric chemistry and
radiative forcing due to aerosols. The mass absorption efficiency (MAE) of EC (3.8±1.3
m2 g−1) exhibits significant decrease with increase in the concentrations of OC,
nss-SO42− and NO3−. A scatter-plot for OC/EC and nss-SO42−/EC characteristically
differentiates biomass burning emissions in the IGP than those from FFc sources in
south-east Asia. Likewise, cross-plot of PAHs-isomers serve as potential tracers for
BBEs in the IGP. Results emerging from these studies have major implications to
re-assessment of model parameters for atmospheric radiative forcing due to black carbon
from BBEs in the IGP, along the foot-hills of Himalaya and downwind marine
atmospheric boundary layer over the Indian Ocean. Please fill in your abstract text. |
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