Identification of aerosol types over Indo-Gangetic Basin: implications to optical properties and associated radiative forcing

The aerosols in the Indo-Gangetic Basin (IGB) are a mixture of sulfate, dust, black carbon, and other soluble and insoluble components. It is a challenge not only to identify these various aerosol types, but also to assess the optical and radiative implications of these components. In the present st...

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Bibliographic Details
Published in:Environmental science and pollution research international 2015-08, Vol.22 (16), p.12246-12260
Main Authors: Tiwari, S., Srivastava, A. K., Singh, A. K., Singh, Sachchidanand
Format: Article
Language:English
Subjects:
Aerosols
Aerosols - analysis
Albedo
Aquatic Pollution
Atmosphere - chemistry
Atmospheric aerosols
Atmospheric Protection/Air Quality Control/Air Pollution
Biomass
Black carbon
Carbon
Carbon - analysis
Climate Change
Dust
Dust - analysis
Earth and Environmental Science
Ecotoxicology
Environment
Environmental Chemistry
Environmental Health
Environmental Monitoring - methods
Environmental Monitoring - statistics & numerical data
Humidity
India
Optical properties
Organic carbon
Pakistan
Radiometers
Regions
Research Article
Seasons
Soot - analysis
Summer
Waste Water Technology
Water Management
Water Pollution Control
Weather
Wind
Winter
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Summary:The aerosols in the Indo-Gangetic Basin (IGB) are a mixture of sulfate, dust, black carbon, and other soluble and insoluble components. It is a challenge not only to identify these various aerosol types, but also to assess the optical and radiative implications of these components. In the present study, appropriate thresholds for fine-mode fraction and single-scattering albedo have been used to first identify the aerosol types over IGB. Four major aerosol types may be identified as polluted dust (PD), polluted continental (PC), black carbon-enriched (BCE), and organic carbon-enriched (OCE). Further, the implications of these different types of aerosols on optical properties and radiative forcing have been studied. The aerosol products derived from CIMEL sun/sky radiometer measurements, deployed under Aerosol Robotic Network program of NASA, USA were used from four different sites Karachi, Lahore, Jaipur, and Kanpur, spread over Pakistan and Northern India. PD is the most dominant aerosol type at Karachi and Jaipur, contributing more than 50 % of all the aerosol types. OCE, on the other hand, contributes only about 12–15 % at all the stations except at Kanpur where its contribution is ∼38 %. The spectral dependence of AOD was relatively low for PD aerosol type, with the lowest AE values (1.0). SSA was found to be the highest for OCE (>0.9) and the lowest for BCE (
ISSN:0944-1344
1614-7499
DOI:10.1007/s11356-015-4495-6