Wildfire
particulate
matter
from
Canadian
forest
fires
significantly
impacted
the
air
quality
in
northeastern
United
States
during
summer
of
2023.
Here,
we
used
real-time
and
time-integrated
instrumentation
to
characterize
physicochemical
properties
radiative
effects
wildfire
reaching
metropolitan
areas
New
Jersey/
York
this
extreme
incident.
The
forcing
-352.4
W/m2
derived
here
based
on
measured
optical
explains,
some
extent,
ground
level
temperature
reduction
about
3
°C
observed
City
Such
negative
densely
populated
megacities
may
limit
natural
ventilation,
increase
residence
time
background
pollutants,
exacerbating
public
health
risks.
This
study
highlights
importance
their
potential
implications
for
climate,
health.
Journal of Geophysical Research Atmospheres,
Journal Year:
2024,
Volume and Issue:
129(16)
Published: Aug. 17, 2024
Abstract
Modeling
atmospheric
black
carbon
(BC)
aerosol
optical
properties
remains
largely
uncertain
due
to
their
complex
mixing
states,
nonsphericity,
and
heterogeneity
of
coating
distribution.
Although
there
exist
numerical
models
with
realistic
BC
morphologies,
these
are
mostly
limited
particle‐scale
studies
have
not
been
coupled
large‐scale
or
climate
models.
In
this
study,
a
multidimensional
parameterization
scheme
is
developed
by
an
accurate
algorithm
for
property
calculation
in
global
models,
incorporating
state
nonspherical
structure
as
well
heterogeneous
The
was
tested
the
Community
Atmosphere
Model
version
6
(CAM6)
weighted
averaging
individual
particles
integration
particle
ensembles.
simulation
results
indicate
that
morphology
has
influence
on
absorption
cross
section
(
C
abs
),
differences
between
irregularly
coated
fractal
aggregates
ideal
core‐shell
spherical
(CS)
counterparts
∼3%
average.
However,
relative
positions
core
parts
may
introduce
variations
up
69%
compared
CS
results.
∼20%
average
depth,
which
comparable
distribution
three
times
greater
than
nonsphericity.
Furthermore,
normalized
mean
biases
modeled
single
scattering
coalbedo
(1−SSA,
i.e.,
ratio
extinction)
those
observed
BC‐rich
regions
reduced
20%∼80%
when
applying
our
new
CAM6.
Journal of Geophysical Research Atmospheres,
Journal Year:
2022,
Volume and Issue:
127(21)
Published: Oct. 23, 2022
Abstract
The
radiative
forcing
of
soot
is
dependent
on
the
morphology,
mixing
state
and
structure.
Cloud
processing
has
been
predicted
to
affect
their
properties
but
little
known
about
resulting
light
absorption
properties.
We
collected
ambient
particles
in
pre‐cloud
period,
cloud
residues
interstitials
in‐cloud
period
at
Mt.
Tianjing
(southern
China).
morphology
parameters
aggregates
with
varying
materials
[sulfate
(S)
organics
(OM)]
structures
were
investigated
by
a
transmission
electron
microscope,
cross
section
calculated
based
discrete
dipole
approximation.
found
that
number
contribution
soot‐S
decreased
from
45%
32%
soot‐OM
increased
44%
60%.
Moreover,
proportion
fully
embedded
structure
remarkably
(29%),
compared
(3%).
In
addition,
became
denser
after
aqueous
process.
However,
for
aggregates,
remained
relatively
constant.
distinctly
different
change
highlights
chemically
resolved
reconstruction
morphology.
Theoretical
calculation
further
shows
changes
morphological
characteristics
process
resulted
enhancement
increase
1.57
2.01.
This
study
evolution
microphysical
upon
should
also
be
considered
climate
models
more
accurately
evaluate
impacts
particles.
Abstract.
Recent
studies
have
suggested
that
injection
of
solid
particles
such
as
alumina
and
calcite
for
stratospheric
aerosol
(SAI)
instead
sulfur-based
injections
could
reduce
some
the
adverse
side
effects
SAI
ozone
depletion
heating.
Here,
we
present
a
version
global
aerosol-chemistry-climate
model
SOCOL-AERv2
Earth
System
Model
(ESM)
SOCOLv4
which
incorporate
particle
microphysics
scheme
assessment
particles.
Microphysical
interactions
with
sulfur
cycle
were
interactively
coupled
to
heterogeneous
chemistry
radiative
transfer
code
(RTC)
first
time
within
an
ESM.
Therefore,
allows
simulation
at
surface
well
feedbacks
between
microphysics,
chemistry,
radiation
climate.
We
show
results
in
doubling
burden
compared
same
rate
radius
240
nm,
mainly
due
smaller
density
average
size
sulfuric
acid
aerosols
thus,
slower
sedimentation.
achieve
forcing,
larger
rates
are
needed
than
SAI.
The
would
be
significantly
perturbed,
reduction
by
53
%,
when
injecting
5
Mt/yr
or
nm
radius.
will
acquire
coating
equivalent
about
10
thickness,
if
is
equally
distributed
over
whole
available
area
lower
stratosphere.
However,
steep
contact
angle
on
particles,
likely
not
cover
entire
surface,
result
reactions
other
ones
acid.
When
applying
realistic
uptake
coefficients
1.0,
10-5
10-4
H2SO4,
HCl
HNO3,
respectively,
scenario
94
%
mass
remaining
form
CaCO3.
This
keeps
optical
properties
intact,
but
alter
occurring
surfaces.
major
process
uncertainties
1)
plume
degree
agglomeration
sub-ESM
grid
scale,
2)
scattering
resulting
agglomerates
3)
4)
aerosol-cloud
interactions.
These
can
only
addressed
extensive,
coordinated,
experimental
modelling
research
efforts.
presented
this
work
offers
useful
tool
sensitivity
impact
analysis
new
points
Catalysis Science & Technology,
Journal Year:
2024,
Volume and Issue:
14(19), P. 5731 - 5738
Published: Jan. 1, 2024
A
strategy
of
constructing
2D/2D
Mo
2
CT
x
/g-C
3
N
4
photocatalyst
with
strong
coupling
interface
via
a
one-step
NH
Cl-assisted
method
by
in
situ
growing
g-C
nanosheets
on
surface
for
rapid
electron
transfer
and
boosted
H
-evolution
activity.
npj Climate and Atmospheric Science,
Journal Year:
2023,
Volume and Issue:
6(1)
Published: Nov. 18, 2023
Abstract
Direct
radiative
forcing
(DRF)
of
aerosols
is
driven
by
aerosol
concentration,
size,
and
mixing
state,
solar
radiation.
This
work
introduces
Core-Shell
Mie
model
optimization
(COSMO)
to
compute
top
the
atmosphere
(TOA)
based
on
inversely
constrained
black
carbon
(BC)
size
state
from
AERONET,
over
two
rapidly
developing
areas:
Lumbini
Taihu.
COSMO
has
both,
a
less
negative
TOA
than
AERONET
wider
range
variability,
with
mean
standard
deviation
difference
between
being
13
±
8.1
W
m
−
2
at
16
12
−2
These
differences
are
particle
aging
size-resolved
BC
emissions,
up
17.9%
cases
warmer
maximum
TOA,
1.9%
total
possible
show
net-warming
(TOA
>
0).
A
linearized
correction
deduced
which
can
be
immediately
implemented
climate
models,
suggested
ranges
observations
made
for
future
campaigns.
Given
that
bias
uncertainty
larger
locally
emitted
GHGs,
active
consideration
necessary
reduce
in
areas.
