Environmental Science & Technology,
Journal Year:
2013,
Volume and Issue:
47(12), P. 6349 - 6357
Published: May 23, 2013
Brown
carbon
(BrC),
which
may
include
secondary
organic
aerosol
(SOA),
can
be
a
significant
climate-forcing
agent
via
its
optical
absorption
properties.
However,
the
overall
contribution
of
SOA
to
BrC
remains
poorly
understood.
Here,
correlations
between
oxidation
level
and
properties
are
examined.
was
generated
in
flow
reactor
absence
NOx
by
OH
gas-phase
precursors
used
as
surrogates
for
anthropogenic
(naphthalene,
tricyclo[5.2.1.0(2,6)]decane),
biomass
burning
(guaiacol),
biogenic
(α-pinene)
emissions.
chemical
composition
characterized
with
time-of-flight
mass
spectrometer.
mass-specific
cross
sections
(MAC)
refractive
indices
were
calculated
from
real-time
cavity
ring-down
photoacoustic
spectrometry
measurements
at
405
532
nm
UV-vis
methanol
extracts
filter-collected
particles
(300
600
nm).
At
nm,
MAC
values
imaginary
increased
increasing
decreased
wavelength,
leading
negligible
nm.
Real
level.
Comparison
literature
studies
suggests
that
under
typical
polluted
conditions
effect
on
is
small.
contribute
significantly
atmospheric
BrC,
magnitude
dependent
both
precursor
type
Atmospheric chemistry and physics,
Journal Year:
2014,
Volume and Issue:
14(12), P. 6159 - 6176
Published: June 23, 2014
Abstract.
Organic
aerosols
(OA)
represent
one
of
the
major
constituents
submicron
particulate
matter
(PM1)
and
comprise
a
huge
variety
compounds
emitted
by
different
sources.
Three
intensive
measurement
field
campaigns
to
investigate
aerosol
chemical
composition
all
over
Europe
were
carried
out
within
framework
European
Integrated
Project
on
Aerosol
Cloud
Climate
Air
Quality
Interactions
(EUCAARI)
Monitoring
Evaluation
Programme
(EMEP)
during
2008
(May–June
September–October)
2009
(February–March).
In
this
paper
we
focus
identification
main
organic
sources
define
standardized
methodology
perform
source
apportionment
using
positive
matrix
factorization
(PMF)
with
multilinear
engine
(ME-2)
Aerodyne
mass
spectrometer
(AMS)
data.
Our
procedure
is
tested
applied
25
data
sets
accounting
for
two
urban,
several
rural
remote
high
altitude
sites;
therefore
it
likely
suitable
treatment
AMS-related
ambient
sets.
For
most
sites,
four
components
are
retrieved,
improving
significantly
previous
results
where
only
separation
in
primary
secondary
OA
was
possible.
Generally,
our
solutions
include
sources,
i.e.
hydrocarbon-like
(HOA)
biomass
burning
(BBOA)
components,
semi-volatile
oxygenated
(SV-OOA)
low-volatility
(LV-OOA).
specific
sites
cooking-related
(COA)
marine-related
(MSA)
also
separated.
Finally,
work
provides
large
overview
an
interesting
set
highly
time
resolved
modeling
purposes.
Atmospheric chemistry and physics,
Journal Year:
2012,
Volume and Issue:
12(24), P. 12037 - 12059
Published: Dec. 19, 2012
Abstract.
This
paper
synthesizes
the
available
scientific
information
connecting
atmospheric
nucleation
with
subsequent
cloud
condensation
nuclei
(CCN)
formation.
We
review
both
observations
and
model
studies
related
to
this
topic,
discuss
potential
climatic
implications.
conclude
that
CCN
production
associated
is
frequent
widespread
phenomenon
in
many
types
of
continental
boundary
layers,
probably
also
over
a
large
fraction
free
troposphere.
The
contribution
global
budget
spans
relatively
uncertainty
range,
which,
together
our
poor
understanding
aerosol-cloud
interactions,
results
major
uncertainties
radiative
forcing
by
aerosols.
In
order
better
quantify
role
formation
Earth
System
behavior,
more
needed
on
(i)
factors
controlling
(ii)
properties
primary
secondary
their
interconnections.
future
investigations,
emphasis
should
be
put
combining
field
measurements
regional
large-scale
studies.
Geophysical Research Letters,
Journal Year:
2016,
Volume and Issue:
43(14), P. 7735 - 7744
Published: July 14, 2016
Abstract
In
the
atmosphere
nighttime
removal
of
volatile
organic
compounds
is
initiated
to
a
large
extent
by
reaction
with
nitrate
radical
(NO
3
)
forming
nitrates
which
partition
between
gas
and
particulate
phase.
Here
we
show
based
on
particle
phase
measurements
performed
at
suburban
site
in
Netherlands
that
contribute
substantially
mass.
Comparisons
chemistry
transport
model
indicate
most
measured
are
formed
NO
oxidation.
Using
aerosol
composition
data
from
three
intensive
observation
periods
numerous
measurement
sites
across
Europe,
conclude
considerable
fraction
fine
matter
(PM
1
continental
scale.
Organic
represent
34%
44%
submicron
found
all
urban
rural
sites,
implying
substantial
potential
PM
reduction
x
emission
control.
Environmental Science & Technology,
Journal Year:
2013,
Volume and Issue:
47(12), P. 6349 - 6357
Published: May 23, 2013
Brown
carbon
(BrC),
which
may
include
secondary
organic
aerosol
(SOA),
can
be
a
significant
climate-forcing
agent
via
its
optical
absorption
properties.
However,
the
overall
contribution
of
SOA
to
BrC
remains
poorly
understood.
Here,
correlations
between
oxidation
level
and
properties
are
examined.
was
generated
in
flow
reactor
absence
NOx
by
OH
gas-phase
precursors
used
as
surrogates
for
anthropogenic
(naphthalene,
tricyclo[5.2.1.0(2,6)]decane),
biomass
burning
(guaiacol),
biogenic
(α-pinene)
emissions.
chemical
composition
characterized
with
time-of-flight
mass
spectrometer.
mass-specific
cross
sections
(MAC)
refractive
indices
were
calculated
from
real-time
cavity
ring-down
photoacoustic
spectrometry
measurements
at
405
532
nm
UV-vis
methanol
extracts
filter-collected
particles
(300
600
nm).
At
nm,
MAC
values
imaginary
increased
increasing
decreased
wavelength,
leading
negligible
nm.
Real
level.
Comparison
literature
studies
suggests
that
under
typical
polluted
conditions
effect
on
is
small.
contribute
significantly
atmospheric
BrC,
magnitude
dependent
both
precursor
type
