Abstract.
Atmospheric
age
reflects
how
long
particles
have
been
suspended
in
the
atmosphere,
which
is
closely
associated
with
evolution
of
air
pollutants.
Severe
regional
haze
events
occur
frequently
China,
influencing
quality,
human
health,
and
climate.
Previous
studies
explored
characteristics
mass
concentrations
compositions
fine
particulate
matter
(PM2.5)
during
events,
but
atmospheric
remains
unclear.
In
this
study,
age-resolved
UCD/CIT
model
was
developed
applied
to
simulate
concentration
distribution
PM2.5
a
severe
episode
eastern
China.
The
results
indicated
that
North
China
Plain
(NCP)
gradually
accumulated
due
stagnant
weather
conditions
at
beginning
stage
event.
Accordingly,
elemental
carbon
(EC),
primary
organic
aerosol
(POA),
sulfate
(SO42−),
secondary
(SOA)
increased.
subsequent
growth
driven
by
local
chemical
formation
nitrate
(NO3−)
under
high
relative
humidity.
newly
formed
NO3−
led
decrease
mean
particles.
During
transport
stage,
aged
from
NCP
moved
downwind
Yangtze
River
Delta
(YRD)
region,
leading
sharp
increase
average
EC,
POA,
SO42−,
SOA.
contrast,
ammonium
remained
unchanged
or
even
slightly
decreased
continuous
YRD
region.
Different
among
these
components
provides
unique
perspective
on
information
can
also
be
used
for
designing
effective
control
strategies
different
PM2.5.
Toxics,
Journal Year:
2024,
Volume and Issue:
12(6), P. 432 - 432
Published: June 14, 2024
International
shipping’s
particulate
matter
primary
emissions
have
a
share
in
global
anthropogenic
of
between
3%
and
4%.
Ship
volatile
organic
compounds
(VOCs)
can
play
an
important
role
the
formation
fine
matter.
Using
aerosol
box
model
for
near-plume
scale,
this
study
investigated
how
changing
VOC
emission
factor
(EF)
ship
engines
impacts
secondary
PM2.5
exhaust
plumes
that
were
detected
during
measurement
campaign.
The
agreement
measured
modeled
particle
number
size
distribution
was
improved
by
adjusting
emissions,
particular
intermediate-,
low-,
extremely
low-volatility
compounds.
scaling
showed
initial
factor,
based
on
literature
data,
had
to
be
multiplied
3.6
all
VOCs.
Information
obtained
from
integrated
into
regional-scale
chemistry
transport
(CTM)
influence
changed
over
Mediterranean
Sea.
CTM
run
with
adjusted
indicated
change
up
5%
at
main
shipping
routes
harbor
cities
summer.
Nevertheless,
overall
changes
due
EF
rather
small,
indicating
grid
cells
CTMs
leads
fast
dilution.
Angewandte Chemie,
Journal Year:
2024,
Volume and Issue:
136(39)
Published: July 11, 2024
Abstract
Bromine
chemistry
is
responsible
for
the
catalytic
ozone
destruction
in
atmosphere.
The
heterogeneous
reactions
of
sea‐salt
aerosols
are
main
abiotic
sources
reactive
bromine
Here,
we
present
a
novel
mechanism
activation
bromide
ions
(Br
−
)
by
O
2
and
H
absence
additional
oxidants.
laboratory
theoretical
calculation
results
demonstrated
that
under
dark
conditions,
Br
,
3
+
could
spontaneously
generate
HO
radicals
through
proton–electron
transfer
process
at
air–water
interface
liquid
phase.
Our
also
showed
light
acidity
significantly
promote
production
.
estimated
gaseous
rate
was
up
to
1.55×10
10
molecules
cm
−2
⋅
s
−1
acidic
conditions;
these
significant
contribution
atmospheric
budget.
oxygen
species
(ROS)
generated
during
multiphase
oxidation
SO
produce
sulfuric
acid,
while
increase
had
positive
feedback
effect
on
activation.
findings
highlight
crucial
role
proton‐electron
production;
here,
facilitates
serves
as
source
exerts
profound
impact
capacity.
Abstract.
Atmospheric
age
reflects
how
long
particles
have
been
suspended
in
the
atmosphere,
which
is
closely
associated
with
evolution
of
air
pollutants.
Severe
regional
haze
events
occur
frequently
China,
influencing
quality,
human
health,
and
climate.
Previous
studies
explored
characteristics
mass
concentrations
compositions
fine
particulate
matter
(PM2.5)
during
events,
but
atmospheric
remains
unclear.
In
this
study,
age-resolved
UCD/CIT
model
was
developed
applied
to
simulate
concentration
distribution
PM2.5
a
severe
episode
eastern
China.
The
results
indicated
that
North
China
Plain
(NCP)
gradually
accumulated
due
stagnant
weather
conditions
at
beginning
stage
event.
Accordingly,
elemental
carbon
(EC),
primary
organic
aerosol
(POA),
sulfate
(SO42−),
secondary
(SOA)
increased.
subsequent
growth
driven
by
local
chemical
formation
nitrate
(NO3−)
under
high
relative
humidity.
newly
formed
NO3−
led
decrease
mean
particles.
During
transport
stage,
aged
from
NCP
moved
downwind
Yangtze
River
Delta
(YRD)
region,
leading
sharp
increase
average
EC,
POA,
SO42−,
SOA.
contrast,
ammonium
remained
unchanged
or
even
slightly
decreased
continuous
YRD
region.
Different
among
these
components
provides
unique
perspective
on
information
can
also
be
used
for
designing
effective
control
strategies
different
PM2.5.
Abstract.
Atmospheric
age
reflects
how
long
particles
have
been
suspended
in
the
atmosphere,
which
is
closely
associated
with
evolution
of
air
pollutants.
Severe
regional
haze
events
occur
frequently
China,
influencing
quality,
human
health,
and
climate.
Previous
studies
explored
characteristics
mass
concentrations
compositions
fine
particulate
matter
(PM2.5)
during
events,
but
atmospheric
remains
unclear.
In
this
study,
age-resolved
UCD/CIT
model
was
developed
applied
to
simulate
concentration
distribution
PM2.5
a
severe
episode
eastern
China.
The
results
indicated
that
North
China
Plain
(NCP)
gradually
accumulated
due
stagnant
weather
conditions
at
beginning
stage
event.
Accordingly,
elemental
carbon
(EC),
primary
organic
aerosol
(POA),
sulfate
(SO42−),
secondary
(SOA)
increased.
subsequent
growth
driven
by
local
chemical
formation
nitrate
(NO3−)
under
high
relative
humidity.
newly
formed
NO3−
led
decrease
mean
particles.
During
transport
stage,
aged
from
NCP
moved
downwind
Yangtze
River
Delta
(YRD)
region,
leading
sharp
increase
average
EC,
POA,
SO42−,
SOA.
contrast,
ammonium
remained
unchanged
or
even
slightly
decreased
continuous
YRD
region.
Different
among
these
components
provides
unique
perspective
on
information
can
also
be
used
for
designing
effective
control
strategies
different
PM2.5.
