Molecular characteristics and formation mechanisms of biogenic secondary organic aerosols in the mountainous background atmosphere of southern China
Atmospheric Environment,
Год журнала:
2024,
Номер
329, С. 120540 - 120540
Опубликована: Апрель 27, 2024
Язык: Английский
Aqueous-Phase Photooxidation of Vanillin in the Presence of Nitrite: Characteristics, Products, and Mechanism
ACS ES&T Air,
Год журнала:
2024,
Номер
1(8), С. 860 - 870
Опубликована: Июнь 17, 2024
The
present
study
investigates
the
reaction
characteristics
and
mechanisms
involved
in
aqueous-phase
photooxidation
of
vanillin
(VL)
presence
nitrite
(NO2–).
research
entails
a
comprehensive
analysis
decay
kinetics
VL,
composition
products,
changes
absorbance
under
different
pH
conditions
VL/NO2–
molar
ratios.
results
indicate
notably
rapid
rate
VL
acidic
conditions,
with
ratio
emerging
as
crucial
factor
process.
Notably,
photoreaction
between
NO2–
leads
to
formation
secondary
organic
aerosols
(aqSOA)
comprising
hydroxylation
nitration
oligomers
that
exhibit
strong
absorption
near-ultraviolet
visible
light
regions.
findings,
through
theoretical
calculations,
shed
on
pathways
This
investigation
contributes
valuable
insights
into
atmospheric
phenolic
compounds
initiated
by
NO2–.
obtained
are
particularly
significant
for
understanding
evolution
aqSOA
brown
carbon
(BrC).
Язык: Английский
Tower-based profiles of wintertime secondary organic aerosols in the urban boundary layer over Guangzhou
The Science of The Total Environment,
Год журнала:
2024,
Номер
950, С. 175326 - 175326
Опубликована: Авг. 6, 2024
Язык: Английский
Enhanced Organic Aerosol Formation Induced by Inorganic Aerosol Formed in Laboratory Photochemical Experiments
Journal of Aerosol Science,
Год журнала:
2024,
Номер
unknown, С. 106481 - 106481
Опубликована: Окт. 1, 2024
Язык: Английский
Insights Into the Influence of Anthropogenic Emissions on the Formation of Secondary Organic Aerosols Based on Online Measurements
Journal of Geophysical Research Atmospheres,
Год журнала:
2024,
Номер
129(18)
Опубликована: Сен. 11, 2024
Abstract
To
investigate
the
combined
impacts
of
anthropogenic
and
biogenic
emissions
on
formation
secondary
organic
aerosols
(SOA),
SOA
molecular
tracers,
their
corresponding
volatile
compound
precursors,
other
air
pollutants
were
measured
online
during
winter
summer
seasons
2022
in
an
industrial
city,
Zibo,
China.
The
results
indicate
that
average
concentrations
tracers
16.1
±
9.8
ng
m
−3
99.4
57.2
summer.
During
winter,
(ASOA,
sum
derived
from
naphthalene
mono‐aromatic
compounds)
dominated,
whereas
isoprene
(SOA
I
)
prevailed
Correlation
analysis
between
SO
4
2−
both
high‐order
monoterpene
M‐H
(
R
=
0.46–0.72,
p
<
0.001)
revealed
higher
aerosol
acidity
facilitated
,
with
2
playing
a
significant
role
leading
to
acidity.
Most
(BSOA)
exhibited
positive
correlation
NO
3
−
particularly
implying
remarkable
influence
x
BSOA
formation.
levels
increased
NH
indicating
can
enhance
BSOA.
In
summer,
correlated
O
(O
+
),
substantial
impact
atmospheric
oxidizing
capacity
liquid
water
content
(ALWC)
well
(i.e.,
3‐hydroxyglutaric
acid
(3‐HGA)
3‐hydroxy‐4,4‐dimethylglutaric
(3‐HDMGA)),
2,3‐dihydroxy‐4‐oxopentanoic
(DHOPA)
>
0.5,
0.001),
important
contribution
aqueous‐phase
SOA.
These
findings
underscore
pollutant
ASOA
urban
environments.
Язык: Английский
Amplified Secondary Organic Aerosol Formation Induced by Anthropogenic–Biogenic Interactions in Forests Around Megacities
Journal of Geophysical Research Atmospheres,
Год журнала:
2024,
Номер
129(22)
Опубликована: Ноя. 13, 2024
Abstract
The
amplification
effect
of
anthropogenic‐biogenic
interactions
on
secondary
organic
aerosol
(SOA)
formation
remains
debated,
particularly
regarding
the
impact
anthropogenic
emissions
biogenic
SOA
(BSOA)
in
forests
near
megacities.
This
study
concurrently
measured
typical
and
tracers
during
day
night
at
summit
(1,690
m
a.s.l.)
foot
(200
Nanling
mountains,
a
large
subtropical
forest
adjacent
to
Pearl
River
Delta
(PRD)
southern
China.
Results
revealed
unexpectedly
high
concentrations
BSOA
(149.9
±
70.5
ng
−3
109.7
51.2
foot),
surpassing
those
most
other
background
sites
worldwide.
Daytime
tracer
levels
were
consistent
with
nighttime
levels,
whereas
showed
significantly
higher
night.
Nighttime
correlations
between
O₃
suggest
that
stimulate
formation.
Conversely,
negative
correlation
isoprene
derived
(SOA
I
)
indicates
oxidants
may
also
influence
rose
arrival
pollutants
(e.g.,
SO₂
NO₂),
indicating
pollution
amplifies
by
enhancing
acidity
(pH
<
3).
could
be
mitigated
reduction
due
increased
NH₃
relative
humidity
(RH).
Our
findings
provide
valuable
insights
into
vertical
distribution
surrounding
Язык: Английский