Abstract.
Ozone
(O3)
deposition
is
closely
related
to
air
quality,
ecosystem
and
climate
changes.
Due
the
instrument
method
shortage,
O3
was
less
observed
investigated
in
China,
experiencing
significantly
increasing
exposure.
Here,
we
conducted
a
comprehensive
measurement
of
over
wheat
canopy
at
typical
polluted
agricultural
site
North
China
Plain
using
newly
developed
relaxed
eddy
accumulation
system.
For
main
growing
season
2023,
flux
velocity
(Vd)
averaged
-0.25
±
0.39
μg
m-2
s-1
0.29
0.33
cm
s-1,
respectively.
Daytime
Vd
(0.40
0.38
s-1)
obviously
higher
than
nighttime
(0.17
0.26
s-1).
The
temporal
changes
were
mainly
determined
by
crop
growth,
with
predominant
contribution
stomatal
uptake.
Both
daytime
exhibited
significant
increases
decreasing
relative
humidity,
friction
soil
water
content,
enhanced
leaf
area
index.
With
rapid
moisture,
simultaneous
following
overall
increments
detected,
attributed
remarkably
strengthening
uptake
under
increased
conductance
extended
opening
night,
more
non-stomatal
removal
night
resulted
from
strengthened
NO
emission
moist
conditions.
This
study
confirms
leading
effects
growth
on
modulated
environmental
conditions
non-negligible
influences
nocturnal
plant
activities,
emphasizes
needs
for
observation
different
surfaces
accurate
evaluation
impacts
based
fluxes.
Nature Communications,
Journal Year:
2024,
Volume and Issue:
15(1)
Published: Nov. 26, 2024
Tropospheric
ozone
formation
depends
on
the
emissions
of
volatile
organic
compounds
(VOC)
and
nitrogen
oxides
(NOx).
In
megacities,
abundant
VOC
NOx
sources
cause
relentlessly
high
episodes,
affecting
a
large
share
global
population.
This
study
uses
data
from
Ozone
Monitoring
Instrument
for
formaldehyde
(HCHO)
dioxide
(NO2)
as
proxy
emissions,
respectively,
with
their
ratio
serving
an
indicator
sensitivity.
Ground-level
(O3)
reanalysis
Copernicus
Atmosphere
is
used
to
assess
O3
trends.
We
evaluate
changes
2005
2019
relationship
warming
environment
in
41
megacities
worldwide,
applying
seasonal
Mann-Kendall,
trend
decomposition
methods,
Pearson
correlation
analysis.
reveal
significant
increases
HCHO
(0.1
0.31
×
1015
mol
cm−2
year−1)
regionally
varying
NO2
(−0.22
0.07
year−1).
trends
range
−0.31
0.70
ppb
year−1,
highlighting
relevance
precursor
abundance
levels.
The
strong
between
increasing
temperature
suggests
that
will
continue
rise
climate
change
persists.
Satellite
observations
dioxide,
key
species
contributing
formation,
rising
temperatures
are
driving
increased
levels
globally
urban
remote
environments
In
recent
years,
nocturnal
ozone
enhancement(NOE)
events
have
become
a
hot
research
topic
in
the
field
of
atmospheric
environment.
By
using
statistically-based
data
analysis,
we
made
comparative
investigation
about
concentrations
and
NOE
2022
2023,
further
explored
effects
on
O3
PM2.5
at
night
same
day
next
day.
The
results
showed
that
from
to
2023
Dongying,
annual
average
increased
51
μg/m3
59
μg/m3,
frequency
was
higher
spring,
summer
autumn,
lower
winter.
not
only
had
an
obvious
promoting
effect
Ox,
daily
maximum
8
h
concentration
(MDA8-O3)
(more
apparent
autumn),
PM2.5-bounded
NO3-
SO42-
winter),
but
also
distinct
influence
O3,
Ox
MDA8-O3
summer).
could
strengthen
understanding
phenomena
events,
provide
scientific
basis
for
collaborative
control
urban
areas
Yellow
River
Delta,
China.
Environmental Science & Technology Letters,
Journal Year:
2024,
Volume and Issue:
11(6), P. 553 - 559
Published: April 29, 2024
An
operational
real-time
surface
ozone
(O3)
retrieval
(RT-SOR)
model
was
developed
that
can
provide
a
gapless
diurnal
cycle
of
O3
retrievals
with
spatial
resolution
6.25
km
by
integrating
Chinese
Land
Data
Assimilation
System
(CLDAS)
data
and
multisource
auxiliary
information.
The
robustly
captures
the
hourly
variability,
sample-based
(station-based)
cross-validation
R2
0.88
(0.85)
RMSE
14.3
μg/m3
(16.1
μg/m3).
additional
hindcast-validation
experiment
demonstrated
generalization
ability
is
robust
(R2
=
0.75;
21.9
Compared
previous
studies,
performs
comparably
or
even
better
at
daily
scale
fills
gaps
in
terms
missing
within
24-hour
cycle.
More
importantly,
underpinned
RT
availability
CLDAS
data,
concentration
be
updated
RT,
which
expected
to
advance
our
understanding
pollution
China.
