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Brown carbon in atmospheric outflow from the Indo-Gangetic Plain: Mass absorption efficiency and temporal variability
Abstract The simultaneous measurements of brown carbon (BrC) and elemental carbon (EC) are made in ambient aerosols (PM2.5), collected from a site in north-east India during November'09–March'10, representing the atmospheric outflow from the Indo-Gangetic Plain (IGP) to the Bay of Bengal (BoB). The absorption coefficient of BrC (b abs), assessed from water-soluble organic carbon (WSOC) at 365 nm, varies from 2 to 21 M m−1 and exhibits significant linear relationship (P < 0.05) with WSOC concentration (3–29 μg m−3). The angstrom exponent (α: 8.3 ± 2.6, where b abs ≈ λ −α.) is consistent with that reported for humic-like substances (HULIS) from biomass burning emissions (BBE). The impact of BBE is also discernible from mass ratios of nss-K+/EC (0.2–1.4) and OC/EC (3.4–11.5). The mass fraction of WSOC (10–23%) in PM2.5 and mass absorption efficiency of BrC (σ abs-BrC: 0.5–1.2 m2 g−1) bring to focus the significance of brown carbon in atmospheric radiative forcing due to anthropogenic aerosols over the Indo-Gangetic Plain.
Graphical abstract Display Omitted
Highlights First data on atmospheric brown carbon (BrC) from northern India. BrC absorption shows linear increase with water-soluble organic carbon. Angstrom exponent of BrC is consistent with that for biomass burning emissions. Ratio of mass absorption efficiency of BrC relative to EC is as high as 0.72. Atmospheric radiative forcing by BrC and BC needs reassessment on regional scale.
Brown carbon in atmospheric outflow from the Indo-Gangetic Plain: Mass absorption efficiency and temporal variability
Abstract The simultaneous measurements of brown carbon (BrC) and elemental carbon (EC) are made in ambient aerosols (PM2.5), collected from a site in north-east India during November'09–March'10, representing the atmospheric outflow from the Indo-Gangetic Plain (IGP) to the Bay of Bengal (BoB). The absorption coefficient of BrC (b abs), assessed from water-soluble organic carbon (WSOC) at 365 nm, varies from 2 to 21 M m−1 and exhibits significant linear relationship (P < 0.05) with WSOC concentration (3–29 μg m−3). The angstrom exponent (α: 8.3 ± 2.6, where b abs ≈ λ −α.) is consistent with that reported for humic-like substances (HULIS) from biomass burning emissions (BBE). The impact of BBE is also discernible from mass ratios of nss-K+/EC (0.2–1.4) and OC/EC (3.4–11.5). The mass fraction of WSOC (10–23%) in PM2.5 and mass absorption efficiency of BrC (σ abs-BrC: 0.5–1.2 m2 g−1) bring to focus the significance of brown carbon in atmospheric radiative forcing due to anthropogenic aerosols over the Indo-Gangetic Plain.
Graphical abstract Display Omitted
Highlights First data on atmospheric brown carbon (BrC) from northern India. BrC absorption shows linear increase with water-soluble organic carbon. Angstrom exponent of BrC is consistent with that for biomass burning emissions. Ratio of mass absorption efficiency of BrC relative to EC is as high as 0.72. Atmospheric radiative forcing by BrC and BC needs reassessment on regional scale.
Brown carbon in atmospheric outflow from the Indo-Gangetic Plain: Mass absorption efficiency and temporal variability
Srinivas, Bikkina (author) / Sarin, M.M. (author)
Atmospheric Environment ; 89 ; 835-843
2014-03-14
9 pages
Article (Journal)
Electronic Resource
English
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