scholarly journals Water-Soluble Brown Carbon in Atmospheric Aerosols from Godavari (Nepal), a Regional Representative of South Asia

2019 ◽  
Vol 53 (7) ◽  
pp. 3471-3479 ◽  
Author(s):  
Guangming Wu ◽  
Kirpa Ram ◽  
Pingqing Fu ◽  
Wan Wang ◽  
Yanlin Zhang ◽  
...  
Keyword(s):  
South Asia ◽  
Atmospheric Aerosols ◽  
Water Soluble ◽  
Brown Carbon

scholarly journals Photochemical degradation affects the light absorption of water-soluble brown carbon in the South Asian outflow

2019 ◽  
Vol 5 (1) ◽  
pp. eaau8066 ◽  
Author(s):  
Sanjeev Dasari ◽  
August Andersson ◽  
Srinivas Bikkina ◽  
Henry Holmstrand ◽  
Krishnakant Budhavant ◽  
...  
Keyword(s):  
South Asia ◽  
Light Absorption ◽  
Climate Models ◽  
Temporal Dynamics ◽  
Regional Scale ◽  
Water Soluble ◽  
Photochemical Oxidation ◽  
Photochemical Degradation ◽  
Gangetic Plain ◽  
Brown Carbon

Light-absorbing organic aerosols, known as brown carbon (BrC), counteract the overall cooling effect of aerosols on Earth’s climate. The spatial and temporal dynamics of their light-absorbing properties are poorly constrained and unaccounted for in climate models, because of limited ambient observations. We combine carbon isotope forensics (δ13C) with measurements of light absorption in a conceptual aging model to constrain the loss of light absorptivity (i.e., bleaching) of water-soluble BrC (WS-BrC) aerosols in one of the world’s largest BrC emission regions—South Asia. On this regional scale, we find that atmospheric photochemical oxidation reduces the light absorption of WS-BrC by ~84% during transport over 6000 km in the Indo-Gangetic Plain, with an ambient first-order bleaching rate of 0.20 ± 0.05 day−1 during over-ocean transit across Bay of Bengal to an Indian Ocean receptor site. This study facilitates dynamic parameterization of WS-BrC absorption properties, thereby constraining BrC climate impact over South Asia.

scholarly journals Aging of atmospheric aerosols and the role of iron in catalyzing brown carbon formation

2021 ◽  
Author(s):  
Hind A. A. Al-Abadleh
Keyword(s):  
Volatile Organic Compounds ◽  
Organic Compounds ◽  
Atmospheric Aerosols ◽  
Secondary Organic Aerosol ◽  
Organic Aerosol ◽  
Atmospheric Oxidation ◽  
Carbon Formation ◽  
Brown Carbon ◽  
Volatile Organic

Extensive research has been done on the processes that lead to the formation of secondary organic aerosol (SOA) including atmospheric oxidation of volatile organic compounds (VOCs) from biogenic and anthropogenic...

scholarly journals Characteristics, seasonality and sources of carbonaceous and ionic components in the tropical Indian aerosols

2011 ◽  
Vol 11 (2) ◽  
pp. 3937-3976 ◽  
Author(s):  
C. M. Pavuluri ◽  
K. Kawamura ◽  
S. G. Aggarwal ◽  
T. Swaminathan
Keyword(s):  
Organic Carbon ◽  
Atmospheric Aerosols ◽  
Atmospheric Transport ◽  
Indian Subcontinent ◽  
Ionic Species ◽  
Water Soluble ◽  
Carbonaceous Aerosols ◽  
Mass Fractions ◽  
High Concentrations ◽  
Ionic Components

Abstract. To better characterize South and Southeast Asian aerosols, PM10 samples collected from tropical Chennai, India (13.04° N; 80.17° E) were analyzed for carbonaceous and water-soluble ionic components. Concentration ranges of elemental carbon (EC) and organic carbon (OC) were 2.4–14 μg m−3 and 3.2–15.6 μg m−3 in winter samples whereas they were 1.1–2.5 μg m−3 and 4.1–17.6 μg m−3 in summer samples, respectively. Concentration of secondary organic carbon (SOC) retrieved from EC-tracer method was 4.6 ± 2.8 μg m−3 in winter and 4.3 ± 2.8 μg m−3 in summer. SO42- (8.8 ± 2.5 μg m−3 and 4.1 ± 2.7 μg m−3 in winter and summer, respectively) was found as the most abundant ionic species (57% on average, n = 49), followed by NH4+ (15%) > NO3− > Cl− > K+> Na+ > Ca2+ > MSA− > Mg2+. The mass fractions of EC, organic matter (OM) and ionic species varied seasonally, following the air mass trajectories and corresponding source strength. Based on mass concentration ratios of selected components and relations of EC and OC to marker species, we found that biofuel/biomass burning is the major source of atmospheric aerosols in South and Southeast Asia. The high concentrations of SOC and WSOC/OC ratios (ave. 0.45; n = 49) as well as good correlations between SOC and WSOC suggest that the secondary production of organic aerosols during long-range atmospheric transport is also significant in this region. This study provides the baseline data of carbonaceous aerosols for southern part of the Indian subcontinent.

Seasonal variation of water-soluble ion species in the atmospheric aerosols at the summit of Mt. Fuji

2008 ◽  
Vol 42 (34) ◽  
pp. 8027-8035 ◽  
Author(s):  
Issei Suzuki ◽  
Kazuhiko Hayashi ◽  
Yasuhito Igarashi ◽  
Hiroshi Takahashi ◽  
Yousuke Sawa ◽  
...  
Keyword(s):  
Seasonal Variation ◽  
Atmospheric Aerosols ◽  
Water Soluble ◽  
Ion Species ◽  
Soluble Ion

Multi-wavelength optical determination of black and brown carbon in atmospheric aerosols

2015 ◽  
Vol 108 ◽  
pp. 1-12 ◽  
Author(s):  
D. Massabò ◽  
L. Caponi ◽  
V. Bernardoni ◽  
M.C. Bove ◽  
P. Brotto ◽  
...  
Keyword(s):  
Atmospheric Aerosols ◽  
Brown Carbon ◽  
Multi Wavelength ◽  
Optical Determination
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