brown carbon aerosols from burning of boreal peatlands: microphysical properties, emission factors, and implications for direct radiative forcing
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ID: 227102
2016
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Abstract
The surface air warming over the Arctic has been almost twice as much as the
global average in recent decades. In this region, unprecedented amounts of
smoldering peat fires have been identified as a major emission source of
climate-warming agents. While much is known about greenhouse gas emissions
from these fires, there is a knowledge gap on the nature of particulate
emissions and their potential role in atmospheric warming. Here, we show
that aerosols emitted from burning of Alaskan and Siberian peatlands are
predominantly brown carbon (BrC) – a class of visible light-absorbing organic
carbon (OC) – with a negligible amount of black carbon content. The mean
fuel-based emission factors for OC aerosols ranged from 3.8 to 16.6 g kg−1. Their mass absorption efficiencies
were in the range of 0.2–0.8 m2 g−1 at 405 nm (violet) and dropped sharply to 0.03–0.07 m2 g−1
at 532 nm (green), characterized by a mean
Ångström exponent of ≈ 9. Electron microscopy images of the
particles revealed their morphologies to be either single sphere or
agglomerated “tar balls”. The shortwave top-of-atmosphere aerosol
radiative forcing per unit optical depth under clear-sky conditions was
estimated as a function of surface albedo. Only over bright surfaces with
albedo greater than 0.6, such as snow cover and low-level clouds, the
emitted aerosols could result in a net warming (positive forcing) of the
atmosphere.
| Reference Key |
chakrabarty2016atmosphericbrown
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|---|---|
| Authors | ;R. K. Chakrabarty;M. Gyawali;R. L. N. Yatavelli;R. L. N. Yatavelli;A. Pandey;A. C. Watts;J. Knue;L.-W. A. Chen;L.-W. A. Chen;R. R. Pattison;A. Tsibart;V. Samburova;H. Moosmüller |
| Journal | Journal of agricultural and food chemistry |
| Year | 2016 |
| DOI |
10.5194/acp-16-3033-2016
|
| URL | |
| Keywords |
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