A mechanism of stratospheric O3 intrusion into the atmospheric environment: a case study of the North China Plain
Atmospheric chemistry and physics,
Год журнала:
2024,
Номер
24(12), С. 7013 - 7026
Опубликована: Июнь 18, 2024
Abstract.
Stratosphere-to-troposphere
transport
results
in
the
stratospheric
intrusion
(SI)
of
O3
into
free
troposphere
through
folding
tropopause.
However,
mechanism
SI
that
influences
atmospheric
environment
cross-layer
from
stratosphere
and
to
boundary
layer
has
not
been
elucidated
thoroughly.
In
this
study,
an
event
over
North
China
Plain
(NCP;
33–40°
N,
114–121°
E)
during
19–20
May
2019
was
chosen
investigate
its
impact
on
near-surface
based
multi-source
reanalysis,
observation
data,
air
quality
modeling.
The
revealed
a
induced
by
extratropical
cyclone
system.
with
downward
driven
system,
vertical
coupling
upper
westerly
trough,
middle
northeast
cold
vortex
(NECV),
lower
cyclone,
troposphere.
deep
trough
jet
aroused
tropopause
folding,
lower-stratospheric
penetrated
folded
troposphere;
cut
off
form
typical
compensating
downdrafts
NECV
further
pushed
activated
cyclonic
circulation
governed
across
top,
invading
atmosphere.
event,
average
contribution
accounted
for
at
26.77
%.
proposed
meteorological
atmosphere,
could
improve
understanding
influence
environment,
implications
coordinated
control
pollution.
Язык: Английский
Spatiotemporal characterization of PM2.5, O3, and trace gases associated with East Asian continental outflows via drone sounding
The Science of The Total Environment,
Год журнала:
2024,
Номер
930, С. 172732 - 172732
Опубликована: Апрель 23, 2024
East
Asian
continental
outflows
with
PM2.5,
O3,
and
other
species
may
determine
the
baseline
conditions
affect
air
quality
in
downwind
areas
via
long-range
transport
(LRT).
To
gain
insight
into
impact
spatiotemporal
characteristics
of
airborne
pollutants
outflows,
a
versatile
multicopter
drone
sounding
platform
was
used
to
simultaneously
observe
CO2,
meteorological
variables
(temperature,
specific
humidity,
pressure,
wind
vector)
above
northern
tip
Taiwan,
Cape
Fuiguei,
which
often
encounters
during
winter
monsoon
periods.
By
coordinating
hourly
high-spatial-resolution
profiles
provided
by
soundings,
WRF/CMAQ
model
predictions,
HYSPLIT-simulated
backward
trajectories,
MERRA-2
reanalysis
data,
we
analyzed
two
prominent
phenomena
better
understand
their
physical/chemical
characteristics.
First,
found
that
were
well
mixed
within
height
500
m
when
passed
through
completely
enveloped
Fuiguei.
Eddies
induced
significant
fluctuations
speeds
coupled
minimal
temperature
inversion
LRT
facilitated
vertical
mixing,
possibly
resulting
high
homogeneity
outflow
layer.
Second,
soundings
indicated
exceptionally
O3
concentrations
(70–100
ppbv)
but
relatively
low
PM2.5
(10–20
μg/m3),
CO2
(420–425
ppmv),
VOCs
some
masses.
The
levels
ruled
out
photochemistry
as
cause
formation
high-level
O3.
Further
coordination
data
mass
trajectories
cross
sections
suggested
could
be
attributed
stratospheric
intrusion
advection
outflows.
High-level
persisted
lower
troposphere,
even
reaching
surface,
suggesting
involved
rising
trend
parts
Asia
recent
years
addition
surface
photochemical
factors.
Язык: Английский
Impact of stratospheric intrusions on surface ozone enhancement in Hong Kong in the lower troposphere: Implications for ozone control strategy
Atmospheric Environment,
Год журнала:
2024,
Номер
329, С. 120539 - 120539
Опубликована: Апрель 26, 2024
Язык: Английский
Characteristics and Source Analysis of Ozone Pollution in Tianjin from 2013 to 2022
Remote Sensing,
Год журнала:
2024,
Номер
16(21), С. 3970 - 3970
Опубликована: Окт. 25, 2024
This
study
has
analyzed
ozone
pollution
in
Tianjin
from
2013
to
2022,
focusing
on
the
relationships
between
distribution,
meteorological
conditions,
and
precursor
substances.
A
method
for
identifying
high-value
areas
of
precursors
using
Ozone
Sensitivity
Factor
(FNR)
been
introduced.
Results
show
that
average
concentration
100.608
µg/m3,
with
an
annual
growth
rate
2.84
µg·m⁻3·yr⁻¹.
ranked
among
top
provinces
urban
agglomerations
China
both
rate.
levels
have
peaked
summer,
followed
by
spring,
autumn,
winter,
while
highest
spring.
indicates
extends
summer
into
spring
autumn.
An
analysis
six
events
reveals
significant
regional
transmission
impacts
northern
Hebei
Inner
Mongolia,
contributing
over
30%,
additional
contributions
southern
southwestern
western
Shandong.
In
terms
controlling
precursors,
high-HCHO-value
identified.
The
correlation
high
HCHO
values
ground-level
concentrations
was
0.56339
during
season
0.2214
non-ozone
season,
which
improved
identification
accuracy
varying
degrees,
suggesting
targeting
emissions
these
could
enhance
mitigation
efforts.
Язык: Английский
Analysis of the Causes of an O3 Pollution Event in Suqian on 18–21 June 2020 Based on the WRF-CMAQ Model
Atmosphere,
Год журнала:
2024,
Номер
15(7), С. 831 - 831
Опубликована: Июль 11, 2024
In
recent
years,
O3
pollution
events
have
occurred
frequently
in
Chinese
cities.
Utilizing
the
WRF-CMAQ
model,
this
study
analyzed
causes
of
an
event
Suqian
on
18–21
June
2020,
considering
meteorological
conditions,
process
analysis,
and
source
analysis.
It
also
designed
25
emission
reduction
scenarios
to
explore
more
effective
strategies.
The
results
show
that
conditions
such
as
temperature
wind
field
play
important
role
formation
accumulation
O3.
During
heavy
period,
contribution
vertical
transport
(VTRA)
horizontal
(HTRA)
concentration
is
significantly
enhanced.
photochemical
reactions
precursors,
NOx
VOCs
transported
from
long
distances
directly
other
regions,
contribute
greatly
Suqian;
local
sources
very
little,
between
12.22%
18.33%.
Based
simulation
scenarios,
it
was
found
excessive
not
conducive
concentration,
best
control
ratio
at
about
10%.
Without
affecting
normal
production
life,
recommended
reduce
much
possible,
particularly
those
generated
by
traffic
sources.
Язык: Английский