New insights into the molecular characteristics-dependent light absorption variation of water-soluble organic matter in biomass burning smoke
Atmospheric Research,
Год журнала:
2025,
Номер
unknown, С. 107951 - 107951
Опубликована: Янв. 1, 2025
Язык: Английский
Measurement report: Optical and structural properties of atmospheric water-soluble organic carbon in China – insights from multi-site spectroscopic measurements
Atmospheric chemistry and physics,
Год журнала:
2025,
Номер
25(6), С. 3647 - 3667
Опубликована: Март 27, 2025
Abstract.
To
understand
the
spatial
variation
of
optical
and
structural
properties
water-soluble
brown
carbon
its
influencing
factors
in
China,
light
absorption,
fluorescence,
Fourier
transform
infrared
(FTIR)
spectrum
organic
(WSOC)
different
regions
China
are
measured
following
same
analytical
methods.
The
average
absorption
coefficients
mass
efficiencies
WSOC
at
365
nm
(Abs365
MAE365)
rank
from
high
to
low
as
northwest
>
southwest
north
east
regional
site,
with
higher
values
northern
than
southern
sites
inland
areas
coastal
areas.
resolved
by
spectra-based
positive
matrix
factorization
model
abundance
aromatic
O−H
C=C
functional
groups
determined
FTIR
both
indicate
that
compounds
significant
light-absorbing
substances
have
a
impact
on
fluorophores.
Multiple
linear
regression
analysis
shows
fluorophores
identified
fluorescence
spectra
combined
parallel
factor
(PARAFAC)
contribute
about
62
%–93
%
all
sites,
which
humic-like
substance
(HULIS)
contributes
most,
especially
highly
oxygenated
HULIS
(29
%–50
%)
long
emission
wavelengths.
Combustion
source
emissions
atmospheric
chemical
processes
impacts
some
sites.
Moreover,
relative
humidity
(RH)
can
also
affect
MAE365
WSOC,
decreasing
increase
RH
when
RH<60
remaining
relatively
unchanged
RH>60
%.
Taken
together,
this
study
promotes
better
understanding
heterogeneity
their
China.
Язык: Английский
Spatial variability of carbonaceous aerosols and absorption characteristics between urban background and residential sites during wintertime at a major Mediterranean city (Athens; Greece)
Atmospheric Research,
Год журнала:
2025,
Номер
unknown, С. 108163 - 108163
Опубликована: Апрель 1, 2025
Язык: Английский
Measurement Report: Optical and structural properties of atmospheric water-soluble organic carbon in China: Insights from multi-site spectroscopic measurements
Опубликована: Авг. 20, 2024
Abstract.
To
understand
the
spatial
variation
of
optical
and
structural
properties
water-soluble
brown
carbon
its
influencing
factors
in
China,
light
absorption,
fluorescence,
Fourier
transform
infrared
(FTIR)
spectrum
organic
(WSOC)
different
regions
China
are
measured
following
same
analytical
methods.
The
average
absorption
coefficients
mass
efficiencies
WSOC
at
365
nm
(Abs365
MAE365)
rank
from
high
to
low
as
northwest
>
southwest
north
east
regional
site,
with
higher
values
Northern
than
Southern
sites,
inland
areas
coastal
areas.
resolved
by
positive
matrix
factorization
model
combined
spectra
abundant
aromatic
O-H
C=C
functional
groups
determined
FTIR
both
indicate
that
compounds
important
light-absorbing
substances
WSOC,
which
also
have
a
significant
impact
on
fluorophores.
Multiple
linear
regression
analysis
shows
identified
fluorophores
fluorescence
parallel
factor
contribute
about
62–93
%
all
humic-like
substance
(HULIS)
contributes
most,
especially
highly‑oxygenated
HULIS
(29
%–50
%)
long
emission
wavelengths.
Combustion
source
emissions
atmospheric
chemical
processes
impacts
some
sites.
Moreover,
relative
humidity
(RH)
can
affect
MAE365
decreasing
increase
RH
when
<
60
remaining
relatively
unchanged
%.
Taken
together,
this
study
promotes
better
understanding
heterogeneity
their
China.
Язык: Английский