Effect of relative humidity on the molecular composition of secondary organic aerosols from α-pinene ozonolysis
Environmental Science Atmospheres,
Год журнала:
2024,
Номер
4(5), С. 519 - 530
Опубликована: Янв. 1, 2024
Secondary
organic
aerosols
(SOAs)
originating
from
the
oxidation
of
biogenic
volatile
compounds
such
as
monoterpenes
by
atmospheric
oxidants
(
e.g.
OH,
ozone,
and
NO
3
),
constitute
a
widespread
source
in
atmosphere.
Язык: Английский
Secondary Organic Aerosol from Biomass Burning Phenolic Compounds and Nitrate Radicals can be Highly Viscous over a Wide Relative Humidity Range
Environmental Science & Technology,
Год журнала:
2024,
Номер
58(49), С. 21702 - 21715
Опубликована: Ноя. 27, 2024
Biomass
burning
events,
including
wildfires,
can
emit
large
amounts
of
phenolic
compounds
such
as
guaiacol.
These
undergo
oxidation
by
nitrate
radicals
(NO
Язык: Английский
Smog chamber study on the NOx dependence of SOA from isoprene photo-oxidation: implication on RO2 chemistry
Journal of Environmental Sciences,
Год журнала:
2025,
Номер
unknown
Опубликована: Май 1, 2025
Язык: Английский
Combined Smog Chamber/Oxidation Flow Reactor Study on Aging of Secondary Organic Aerosol from Photooxidation of Aromatic Hydrocarbons
Environmental Science & Technology,
Год журнала:
2023,
Номер
57(37), С. 13937 - 13947
Опубликована: Сен. 11, 2023
Secondary
organic
aerosol
(SOA)
is
a
significant
component
of
atmospheric
fine
particulate
matter
(PM2.5),
and
their
physicochemical
properties
can
be
significantly
changed
in
the
aging
process.
In
this
study,
we
used
combination
consisting
smog
chamber
(SC)
oxidation
flow
reactor
(OFR)
to
investigate
continuous
process
gas-phase
intermediates
SOA
formed
from
photooxidation
toluene,
typical
aromatic
hydrocarbon.
Our
results
showed
that
as
OH
exposure
increased
2.6
×
1011
6.3
molecules
cm-3
s
(equivalent
time
2.01-4.85
days),
mass
concentration
(2.9
±
0.05-28.7
0.6
μg
cm-3)
corrected
yield
(0.073-0.26)
were
enhanced.
As
proceeds,
acids
multiple
oxygen-containing
products
are
continuously
produced
photochemical
(mainly
semi-volatile
intermediate
volatility
species,
S/IVOCs).
The
multigeneration
then
partition
phase,
while
functionalization
rather
than
fragmentation
dominated
process,
resulting
much
higher
after
compared
SC.
study
indicates
yields
function
should
considered
air
quality
models
improve
simulation,
thus
accurately
assess
impact
on
regional
quality.
Язык: Английский
Secondary organic aerosol from biomass burning phenolic compounds and nitrate radicals can be highly viscous over a wide relative humidity range
Опубликована: Июнь 19, 2024
Biomass
burning
events,
including
wildfires,
can
emit
large
amounts
of
phenolic
compounds
such
as
guaiacol.
These
undergo
oxidation
by
nitrate
radicals
(NO3)
to
form
secondary
organic
aerosol
(SOA).
Viscosity
and
hygroscopicity
are
key
properties
that
affect
SOA’s
role
in
atmospheric
chemistry,
air
quality,
climate.
However,
these
have
not
been
quantified
for
SOA
formed
from
the
reaction
with
NO3.
We
used
poke-flow
technique
a
quartz
crystal
microbalance
(QCM)
measure
viscosity
particles
generated
NO3
guaiacol,
termed
guaiacol-NO3
SOA.
The
this
is
extremely
high
(≳
5×10^7
Pa
s)
at
RH
≲
70%
drastically
higher
than
previously
reported
other
types
investigated
≳
40%.
be
attributed,
least
part,
low
measured
QCM.
From
results,
we
calculated
mixing
times
molecules
within
results
suggest
atmospherically
relevant
sizes
exceed
1
hour
most
tropospheric
conditions,
possible
implications
predicting
size,
mass,
long-range
transport
pollutants
Язык: Английский
Effect of Relative Humidity on the Rate of New Particle Formation for Different VOCs
Atmosphere,
Год журнала:
2024,
Номер
15(4), С. 480 - 480
Опубликована: Апрель 12, 2024
Atmospheric
new
particle
formation
(NPF)
is
an
important
source
of
aerosol
particles
and
cloud
condensation
nuclei,
which
affect
both
climate
human
health.
In
pristine
environments,
oxidation
biogenic
volatile
organic
compounds
(VOCs)
a
major
contributor
to
NPF.
However,
the
impact
relative
humidity
(RH)
on
NPF
from
these
precursors
remains
poorly
understood.
Herein,
we
report
NPF,
as
inferred
measurements
total
number
density
with
diameter
(dp)
>
7
nm,
three
VOCs
(sabinene,
α-terpineol,
myrtenol)
subjected
dark
ozonolysis.
From
series
comparative
experiments
under
humid
(60%
RH)
dry
(~0%
conditions
variety
VOC
mixing
ratios
(ξVOC,
parts
per
billion
by
volume,
ppbv),
show
varied
behavior
in
at
elevated
RH
depending
ξVOC.
general,
RH-dependent
enhancement
ξVOC
between
<1
ppbv
20
was
observed
for
select
VOCs.
Our
results
suggest
that
gaseous
water
genesis
enhances
promoting
low-volatility
compound
gas-phase
products
(LVOCs).
This
supported
rate
α-pinene-derived
SOA,
where
had
greater
influence
initial
than
did
ξO3.
Язык: Английский