Abstract.
Understanding
the
lifecycle
of
light-absorbing
carbonaceous
aerosols,
from
emission
to
deposition,
is
critical
for
assessing
their
climate
impact.
This
study
integrated
multi-year
aerosol
observations
ATOLL
(Lille
metropolis,
northern
France)
platform,
with
air
mass
back-trajectories
and
inventory
as
a
newly
developed
‘INTERPLAY’
approach.
Applied
Black
Carbon
(BC),
method
apportioned
source
contributions
(shipping,
vehicular,
residential
heating,
industrial)
studied
aging
effects,
notably
on
Brown
(BrC)
component.
Results
estimate
that
throughout
year,
vehicular
traffic
dominated
BC
(31
%),
followed
by
shipping
(25
%,
which
one-third
was
canals/rivers)
heating
(21
%).
Comparing
INTERPLAY
results
aethalometer
model
highlights
‘residential
sector’
can
be
entirely
wood
burning
(BCwb),
in
winter,
while
corresponds
only
about
41
%
fossil
fuel
(BCff)
at
site,
rest
being
(33
%)
industrial
(23
emissions.
Thus,
BCff
should
not
used
interchangeably,
particularly
regions
near
intense
maritime
traffic.
Concerning
BrC,
our
analysis
confirms
dominant
role
heating.
Focusing
suggest
considerable
decrease
BrC
component
24
hours
after
emission,
fresh
emissions
responsible
72
absorption
ATOLL.
Improving
understanding
sources
dynamics
aerosols
crucial
both
abatement
strategies
well
better
assessment
Atmospheric chemistry and physics,
Год журнала:
2023,
Номер
23(16), С. 9439 - 9453
Опубликована: Авг. 25, 2023
Abstract.
The
light-absorbing
organic
aerosol
(OA),
known
as
brown
carbon
(BrC),
has
important
radiative
impacts;
however,
its
sources
and
evolution
after
emission
remain
to
be
elucidated.
In
this
study,
the
light
absorption
at
multiple
wavelengths,
mass
spectra
of
OA
microphysical
properties
black
(BC)
were
characterized
a
typical
suburban
environment
in
Beijing.
BC
is
constrained
by
size
distribution
mixing
state,
BrC
obtained
subtracting
from
total
absorption.
Aerosol
was
further
apportioned
BC,
primary
secondary
applying
least
correlation
between
BC.
multilinear
regression
analysis
on
factorized
indicated
that
traffic
biomass
burning
contributed
BrC.
Importantly,
moderately
oxygenated
(O
/
C
=
0.62)
revealed
highly
correlate
with
These
had
higher
nitrogen
content,
line
nitrogen-containing
functional
groups
detected
Fourier
transform
infrared
spectrometer.
photochemical
processes
found
reduce
cross
section
(MAC)
OA,
reducing
contribution
20
%,
same
time
increasing
MAC
for
which
showed
30
%
enhancement
absorbance,
implying
concurrent
whitening
darkening
This
provides
field
evidence
photochemically
produced
can
considerably
compensate
some
bleaching
effect
BrC,
hereby
causing
impacts.
Aerosol and Air Quality Research,
Год журнала:
2023,
Номер
23(8), С. 220336 - 220336
Опубликована: Янв. 1, 2023
Brown
carbon
(BrC)
are
important
light-absorbing
carbonaceous
aerosols
in
the
atmosphere,
and
it
is
of
great
significance
to
study
climate
effects
BrC
for
regional
or
global
change.
This
paper
reviews
recent
advances
research
on
radiative
forcing
BrC,
its
temperature
precipitation,
snow/ice
albedo.
Recent
suggests
that:
(1)
Climate
can
be
represented
more
accurately
when
including
absorption
models;
regions
with
highest
mean
surface
concentrations
estimated
by
models
mostly
Southeast
Asia
South
America
(biomass
burning),
East
northeast
India
(biofuel
Europe
North
(secondary
sources);
estimates
quite
erratic,
a
range
around
0.03–0.57
W
m–2.
(2)
heating
lead
tropical
expansion
reduction
deep
convective
mass
fluxes
upper
troposphere;
cloud
fraction
type
have
substantial
impact
rate
BrC.
The
inclusion
model
results
clear
shift
fraction,
liquid
water
path,
flux.
decreases
precipitation
scale,
particularly
high
intensity,
but
different
some
regions.
(3)
Uncertain
optical
properties
mixing
ratio
radiation-absorbing
snow,
snow
grain
size
coverage
higher
uncertainties
lower
confidence
simulated
distribution
than
BC.
To
reduce
uncertainty
effects,
future
should
focus
improving
research,
creating
reliable
emission
inventories,
taking
into
account
photobleaching
lense
Atmospheric chemistry and physics,
Год журнала:
2022,
Номер
22(7), С. 4827 - 4839
Опубликована: Апрель 12, 2022
Abstract.
Atmospheric
brown
carbon
(BrC)
makes
a
substantial
contribution
to
aerosol
light
absorption
and
thus
global
radiative
forcing.
Although
BrC
may
change
the
lifetime
of
clouds
ultimately
affect
precipitation,
little
is
known
regarding
optical
properties
formation
in
clouds.
In
present
study,
light-absorption
cloud
droplet
residual
(cloud
RES)
were
measured
by
coupled
ground-based
counterflow
virtual
impactor
(GCVI)
an
aethalometer
(AE-33),
addition
interstitial
INT)
ambient
(cloud-free)
particles
PM2.5
inlet-AE-33
at
Mt.
Tianjing
(1690
m
a.s.l.),
remote
mountain
site
southern
China,
from
November
December
2020.
Meanwhile,
fluorescence
water-soluble
organic
(WSOC)
collected
water
samples
also
obtained,
associated
with
concentration
ions.
The
mean
coefficient
(Abs370)
RES,
INT,
cloud-free
0.25
±
0.15,
1.16
1.14,
1.47
1.23
Mm−1,
respectively.
Abs365
WSOC
was
0.11
0.08
Mm−1
0.40
0.31
PM2.5,
corresponding
mass
efficiency
(MAE365)
0.17
0.07
0.21
m2
g−1,
A
comparison
between
RES
INT
particles,
indicates
considerable
(48
%–75
%)
water-insoluble
total
absorption.
Secondary
estimated
minimum
R
squared
(MRS)
method
dominated
(67
%–85
%),
rather
than
(11
%–16
(9
%–23
particles.
It
indicate
secondary
during
processing.
Supporting
evidence
includes
enhanced
dominant
biomass
burning
factor
(>80
provided
positive
matrix
factorization
(PMF)
analysis.
addition,
we
showed
that
closely
related
humic-like
substances
tyrosine-like
and/or
protein-like
(r>0.63,
p<0.01),
whereas
only
for
as
identified
excitation-emission
spectroscopy.
Aerosol Research,
Год журнала:
2024,
Номер
2(1), С. 107 - 122
Опубликована: Май 28, 2024
Abstract.
Understanding
the
lifecycle
of
light-absorbing
carbonaceous
aerosols,
from
emission
to
deposition,
is
critical
for
assessing
their
climate
impact.
This
study
integrated
multi-year
aerosol
observations
ATOLL
(ATmospheric
Observations
in
liLLe,
northern
France)
platform,
with
air
mass
back
trajectories
and
inventory
as
a
newly
developed
“INTERPLAY”
(IN-siTu
obsERvations,
hysPLit,
And
inventorY)
approach.
Applied
black
carbon
(BC),
method
apportioned
source
contributions
(shipping,
vehicular,
residential
heating,
industrial)
studied
aging
effects,
notably
on
brown
(BrC)
component.
Results
estimate
that,
throughout
year,
vehicular
traffic
dominated
BC
(31
%),
followed
by
shipping
(25
%,
which
one-third
was
canals/rivers)
heating
(21
%).
Comparing
INTERPLAY
results
aethalometer
model
highlights
that
“residential
sector”
can
be
entirely
wood
burning
(BCwb),
winter,
while
corresponds
only
about
41
%
fossil
fuel
(BCff)
at
site,
rest
being
(33
%)
industrial
(23
emissions.
Thus,
BCff
should
not
used
interchangeably,
particularly
regions
near
intense
maritime
traffic.
Concerning
BrC,
our
analysis
confirms
dominant
role
heating.
Focusing
suggest
considerable
decrease
BrC
component
24
h
after
emission,
fresh
emissions
responsible
72
absorption
ATOLL.
The
this
allow
an
improved
understanding
sources
atmospheric
dynamics
aerosols
France,
crucial
both
abatement
strategies
well
better
assessment
Atmospheric chemistry and physics,
Год журнала:
2023,
Номер
23(24), С. 15197 - 15207
Опубликована: Дек. 14, 2023
Abstract.
Brown
carbon
(BrC)
aerosol
is
light-absorbing
organic
that
affects
radiative
forcing
and
atmospheric
photochemistry.
The
BrC
chromophoric
composition
its
linkage
to
optical
properties
at
the
molecular
level,
however,
are
still
not
well
characterized.
In
this
study,
we
investigate
day–night
differences
in
(38
species)
of
water-soluble
water-insoluble
fractions
(WS-BrC
WIS-BrC)
samples
collected
Shijiazhuang,
one
most
polluted
cities
China.
We
found
light
absorption
contribution
WS-BrC
total
365
nm
was
higher
during
day
(62±8
%)
than
night
(47±26
%),
which
line
with
difference
polarity
between
daytime
(more
polar
nitrated
aromatics)
nighttime
less-polar
polycyclic
aromatic
hydrocarbons,
PAHs).
high
water
solubility
suggests
enhanced
secondary
formation
day.
There
a
decrease
mass
efficiency
from
(2.88±0.24
vs.
2.58±0.14
for
1.43±0.83
1.02±0.49
m2
g
C−1
WIS-BrC,
respectively).
Large
hydrocarbons
(PAHs)
four-
six-ring
PAHs
nitrophenols
contributed
76.7
%
300–420
nighttime,
while
nitrocatechols
two-
three-ring
oxygenated
accounted
52.6
concentrations
identified
chromophores
showed
larger
low-pollution
period
(day-to-night
ratio
4.3)
high-pollution
1.8).
large
absorption,
therefore,
should
be
considered
when
estimating
sources,
processes,
impacts
BrC.