Abstract.
Previous
measurement-model
comparisons
of
atmospheric
isoprene
levels
showed
a
significant
unidentified
source
in
some
northern
Chinese
cities
during
winter.
Here,
spatial
variability
winter
aerosol
organosulfate
(OS)
formation
typical
southern
(Guangzhou
and
Kunming)
(Xi’an
Taiyuan)
cities,
China,
was
investigated
to
reveal
the
influence
potential
non
biogenic
contributor
on
OS
pollution
levels.
Monoterpene-derived
OSs
were
significantly
higher
than
which
attributed
temperature
dependent
emission
monoterpenes
(i.e.,
temperatures
drove
more
monoterpene
emissions).
However,
isoprene-derived
(OSi)
opposite
trend,
with
cities.
Principal
component
analysis
combined
field
simulation
combustion
experiments
suggested
that
biomass
burning
rather
gasoline,
diesel,
coal
contributed
abundance
OSi
The
comparison
anthropogenic
molecular
characteristics
between
particles
released
from
various
sources
ambient
stronger
fossil
fuel
activities
promoted
OSs.
Overall,
this
study
provides
direct
evidence
for
first
time
can
contribute
China
Atmospheric chemistry and physics,
Journal Year:
2024,
Volume and Issue:
24(7), P. 4331 - 4346
Published: April 15, 2024
Abstract.
Nitrogen-containing
organic
compounds
(NOCs)
are
abundant
and
important
aerosol
components
deeply
involved
in
the
global
nitrogen
cycle.
However,
sources
formation
processes
of
NOCs
remain
largely
unknown,
particularly
city
(Ürümqi,
China)
farthest
from
ocean
worldwide.
Here,
PM2.5
collected
Ürümqi
over
a
1-year
period
were
characterized
by
ultra-high-resolution
mass
spectrometry.
The
abundance
CHON
(mainly
oxygen-poor
unsaturated
aliphatic-like
species)
positive
ion
mode
was
higher
warm
than
cold
period,
which
attributed
to
contribution
fresh
biomass
material
combustion
(e.g.,
forest
fires)
associated
with
amidation
fatty
acids
rather
oxidation
processes.
nitro-aromatic
negative
increased
significantly
tightly
related
aged
dry
straws)
wintertime
Ürümqi.
For
CHN
compounds,
alkyl
nitriles
aromatic
species
showed
periods,
respectively.
Alkyl
can
be
derived
dehydration
amides
(the
main
period).
In
contrast,
burning.
These
findings
further
suggested
different
impacts
materials
on
NOC
compositions
seasons.
overall
results
shed
light
mechanisms
release
during
combustion.
Environmental Science & Technology Letters,
Journal Year:
2024,
Volume and Issue:
11(9), P. 981 - 987
Published: Aug. 6, 2024
A
global
perspective
on
the
abundance
and
formation
of
organosulfates
(OSs)
during
field
studies
(relative
humidity
53%
to
77%)
suggested
that
investigated
particles
are
generally
nondry
acidic
(pH
<
6).
However,
key
factors
affecting
OS
in
nearly
dry
weakly
aerosol
conditions
remain
elusive.
This
topic
was
resolved
by
examining
composition
OSs
PM2.5
collected
Urumqi
(dry
dusty)
over
a
one-year
period.
Anthropogenic
accounted
for
49
±
8%
total
OSs,
indicating
large
anthropogenic
contribution
(particularly
winter).
The
low
liquid
water
(ALW)
concentration
(2
2
μg
m–3)
weak
particle
acidity
=
7
2)
summer
were
important
limiting
formation.
increased
ALW
(100
70
5
1)
winter
significantly
promoted
production.
most
isoprene-
monoterpene-derived
also
constrained
unfavorable
acidity,
resulting
biogenic
levels
being
lower
than
winter.
study
provides
observational
evidence
constraints
dusty
atmospheric
conditions.
Journal of Geophysical Research Atmospheres,
Journal Year:
2024,
Volume and Issue:
129(16)
Published: Aug. 17, 2024
Abstract
Proteinaceous
matter
(PrM)
is
a
substantial
component
of
bioaerosols.
Although
numerous
studies
have
examined
the
characteristics
and
sources
PrM
in
atmosphere,
its
interactions
with
atmospheric
oxidants
remain
uncertain.
A
1‐year
observation
PM
2.5
was
performed
both
urban
Nanchang
(eastern
China)
suburban
Guiyang
(southwestern
China),
respectively.
Glycine
dominant
free
amino
acid
(FAA)
species
Nanchang.
In
contrast,
proline
dominated
total
acids
(FAAs)
combined
(CAAs)
Guiyang.
We
found
that
oxidative
degradation
can
significantly
promote
release
FAAs,
especially
glycine,
from
CAAs
The
controlled
experiment
on
protein
oxidation
by
hydroxyl
radical
suggested
contribution
glycine
to
FAA
fraction
tended
increase
during
CAAs,
supporting
predominance
FAAs
most
previous
observations.
composition
mainly
influenced
primary
weak
PrM.
These
results
suggest
aerosol
be
responsible
for
difference
between
biosphere
also
imply
may
potential
source
secondary
organic
nitrogen
compounds
aerosols.
Thus,
this
study
improve
current
understanding
as
well
liquid
phase
reactions
proteinaceous
oxidants.
Atmospheric chemistry and physics,
Journal Year:
2024,
Volume and Issue:
24(18), P. 10531 - 10542
Published: Sept. 23, 2024
Abstract.
Amines
and
aminiums
play
an
important
role
in
particle
formation,
liquid-phase
reactions,
climate
change
have
attracted
considerable
attention
over
the
years.
Here,
we
investigated
concentrations
compositions
of
PM2.5
11
Chinese
cities
during
winter,
focusing
on
characteristics
polluted
days
key
factors
influencing
aminium
outbreak.
Monomethylaminium
was
dominant
species
most
cities,
except
Taiyuan
Guangzhou,
followed
by
dimethylaminium.
Diethylaminium
dominated
total
Guangzhou.
Thus,
main
amine
sources
Guangzhou
were
significantly
different
from
those
other
cities.
The
(TAs)
increased
days,
while
relatively
weak
outbreaks
occurred
Xi'an
Beijing.
Additionally,
TAs
Beijing
insignificantly
correlated
with
major
acidic
aerosol
components,
opposite
pattern
observed
nine
acid–base
chemistry
associated
formation
all
Based
sensitivity
analysis
:
ammonium
ratio
to
changes,
as
well
excluding
effects
relative
humidity
atmospheric
oxidation,
proposed
possibility
competitive
uptake
ammonia
versus
amines
aerosols
or
displacement
(constraining
outbreaks).
Overall,
this
study
deepens
understanding
spatiotemporal
differences
characteristic
China.
However,
particles
form
relevant
require
further
mechanistic
research.
Atmospheric chemistry and physics,
Journal Year:
2025,
Volume and Issue:
25(5), P. 2763 - 2780
Published: March 4, 2025
Abstract.
Nitrogen-containing
organic
compounds
(NOCs)
impact
air
quality
and
human
health.
Here,
the
abundance,
potential
precursors,
main
formation
mechanisms
of
NOCs
in
PM2.5
during
winter
were
compared
for
first
time
among
Haerbin
(dependent
on
coal
heating),
Beijing
(natural
gas
as
heating
energy),
Hangzhou
(no
centralized
policy).
The
total
signal
intensity
CHON+,
CHN+,
CHON−
was
highest
lowest
Hangzhou.
Anthropogenic
aromatics
accounted
73
%–93
%
all
identified
precursors
Haerbin.
Although
abundance
aromatic-derived
lower
than
Haerbin,
also
contributors
to
NOC
Beijing.
exhibited
levels
aromatic
precursors.
Furthermore,
non-metric
multidimensional
scaling
analysis
indicated
an
overall
reduction
fossil
fuel
combustion
pollution
along
route
from
We
found
that
aqueous-phase
processes
(mainly
condensation,
hydrolysis,
or
dehydration
reduced
mainly
oxidization
hydrolysis
oxidized
NOCs)
can
promote
transformation
produce
NOCs,
leading
most
significant
increase
(particularly
haze
days).
Reduced
precursor
emissions
(the
lowest)
constrained
NOCs.
results
suggest
aerosol
coal-dependent
cities
is
controlled
by
anthropogenic
processes.
Thus,
without
effective
emission
controls,
through
may
still
pose
a
large
threat
quality.
Atmospheric chemistry and physics,
Journal Year:
2025,
Volume and Issue:
25(5), P. 2967 - 2978
Published: March 12, 2025
Abstract.
Previous
measurement–model
comparisons
of
atmospheric
isoprene
levels
showed
a
significant
unidentified
source
in
some
northern
Chinese
cities
during
winter.
Here,
spatial
variability
winter
aerosol
organosulfate
(OS)
formation
typical
southern
(Guangzhou
and
Kunming)
(Xi'an
Taiyuan)
cities,
China,
was
investigated
to
reveal
the
influence
potential
non-biogenic
contributor
on
OS
pollution
levels.
Monoterpene-derived
OSs
were
significantly
higher
than
which
attributed
temperature-dependent
emission
monoterpenes
(i.e.,
temperatures
drove
more
monoterpene
emissions).
However,
isoprene-derived
(OSi)
opposite
trend,
with
cities.
Principal
component
analysis
combined
field
simulation
combustion
experiments
suggested
that
biomass
burning
rather
gasoline,
diesel,
coal
contributed
abundance
OSi
The
comparison
anthropogenic
molecular
characteristics
between
particles
released
from
various
sources
ambient
stronger
fossil
fuel
activities
promoted
considerable
OSs.
Overall,
this
study
provides
direct
evidence
for
first
time
can
contribute
China
Atmospheric chemistry and physics,
Journal Year:
2024,
Volume and Issue:
24(4), P. 2195 - 2205
Published: Feb. 21, 2024
Abstract.
The
formation
of
secondary
sulfate
in
the
atmosphere
remains
controversial,
and
it
is
an
urgent
need
to
seek
a
new
method
quantify
different
pathways.
Thus,
SO2
PM2.5
samples
were
collected
from
4
22
December
2019
Nanjing
region.
Sulfur
oxygen
isotopic
compositions
synchronously
measured
study
contribution
homogeneous
heterogeneous
oxidation
sulfate.
Meanwhile,
correlation
δ18O
values
between
H2O
by
H2O2
Fe3+
/
O2
was
simulatively
investigated
laboratory.
Based
on
isotope
mass
equilibrium
equations,
ratios
pathways
quantified.
results
showed
that
constituted
higher
than
80
%
total
during
sampling
period.
Laboratory
simulation
experiments
indicated
value
linearly
dependent
water,
slopes
linear
curves
for
0.43
0.65,
respectively.
mainly
ascribed
OH
radicals
O2.
generally
dominant
formation,
predominated
reactions,
with
average
ratio
around
54.6
%.
This
provided
insight
into
precisely
evaluating
combining
stable
sulfur
isotopes.
Aminiums
are
significant
components
of
organic
aerosols
with
intense
research
on
aliphatic
aminiums.
However,
the
mechanisms
formation
aromatic
aminiums
in
urban
remain
elusive.
Highly
time-resolved
PM2.5
samples
were
collected
center
Shanghai
(China)
during
winter
to
investigate
origin
and
The
dominant
aminium
groups
(mainly
dimethylaminium
monomethylaminium).
Anilinium
was
third
most
abundant
aminium.
concentrations
anilinium
total
showed
higher
levels
daytime
weekdays.
This
finding
combined
source
apportionment
analysis
suggested
that
daily
weekly
scale
variations
anthropogenic
activities
(e.g.,
traffic
for
commuting)
mainly
responsible
fluctuations
(particularly
aminiums).
acid
dependence
significantly
stronger
than
formation.
Aliphatic
negatively
positively
correlated
ozone,
respectively,
suggesting
oxidative
processes
weakened
abundance
but
promoted
molecular
characterization
atmospheric
degradation
higher-molecular-weight
amine
compounds
an
important
mechanism
aerosols.
Thus,
this
study
provides
novel
insights
into
Abstract.
Amines
and
aminiums
play
an
important
role
in
particle
formation,
liquid-phase
reactions,
climate
change,
attracting
considerable
attention
over
the
years.
Here,
we
investigated
concentrations
compositions
of
PM2.5
11
Chinese
cities
during
winter,
focusing
on
characteristics
polluted
days
key
factors
influencing
aminium
outbreak.
Monomethylaminium
was
dominant
species
most
excepting
Taiyuan
Guangzhou,
followed
by
dimethylaminium.
Diethylaminium
dominated
total
Guangzhou.
Thus,
main
amine
sources
Guangzhou
were
significantly
different
from
those
other
cities.
The
(TA)
all
increased
days,
with
weak
outbreaks
Xi'an
Beijing.
Additionally,
TA
Beijing
insignificantly
correlated
major
acidic
aerosol
components,
while
opposite
pattern
observed
9
acid-base
chemistry
associated
formation
Based
sensitivity
analysis
aminiums/ammonium
ratio
to
ammonium
changes
as
well
excluding
effects
relative
humidity
atmospheric
oxidation,
proposed
possibility
competitive
uptake
ammonia
versus
amines
aerosols
or
displacement
(constraining
outbreaks).
Overall,
this
study
deepens
understanding
spatiotemporal
differences
characteristic
China.
However,
particles
form
relevant
require
further
mechanistic
research.
