Geophysical Research Letters,
Год журнала:
2023,
Номер
50(24)
Опубликована: Дек. 22, 2023
Abstract
Non‐methane
volatile
organic
compounds
(NMVOCs)
have
a
significant
impact
on
air
quality
in
urban
areas.
Detecting
NMVOCs
emission
with
its
proxy
HCHO
scales
from
space,
however,
has
been
limited
by
the
lack
of
discernible
enhancement.
Here
we
show
clear
plumes
16
cities
over
globe
rotating
TROPOspheric
Monitoring
Instrument
pixels
according
to
wind
directions.
We
fit
downwind
structure
exponentially
modified
Gaussian
approach
quantify
effective
production
rates
between
7.0
and
88.5
mol
s
−1
.
Our
results
are
line
total
NMVOC
emissions
EDGAR
inventory
(
r
=
0.76).
work
offers
new
measure
areas
highlights
potential
satellite
data
provide
information
for
monitoring
quality.
Environmental Science & Technology,
Год журнала:
2022,
Номер
56(18), С. 12906 - 12916
Опубликована: Сен. 9, 2022
In
China,
emissions
of
ozone
(O3)-producing
pollutants
have
been
targeted
for
mitigation
to
reduce
O3
pollution.
However,
the
observed
decrease
is
slower
than/opposite
expectations
affecting
health
millions
people.
For
a
better
understanding
this
failure
and
its
connection
with
anthropogenic
emissions,
we
quantify
summer
trends
that
would
occurred
had
weather
stayed
constant
by
applying
numerical
tool
"de-weathers"
observations
across
31
urban
regions
(123
cities
392
sites)
over
8
years.
are
significant
(p
<
0.05)
234
sites
after
de-weathering,
contrary
directly
(only
39
due
high
meteorology-induced
variability).
The
de-weathered
data
allow
categorizing
in
China
into
four
different
groups
regarding
mitigation,
group
1
exhibiting
steady
reductions,
while
4
showing
increases.
Analysis
relationships
between
odd
oxygen
nitrogen
oxides
illustrates
how
changes
NOx,
volatile
organic
compounds
(VOCs),
reductions
fine
particulate
matter
(PM2.5)
affect
differently
these
groups.
While
analysis
suggests
VOC
main
driver
decreases
1,
3
primarily
affected
decreasing
PM2.5,
which
results
enhanced
formation.
Our
demonstrates
both
importance
possibility
isolating
emission-driven
from
climate
interpreting
short-term
air
quality
observations.
Environmental Science & Technology,
Год журнала:
2022,
Номер
56(12), С. 7564 - 7577
Опубликована: Май 17, 2022
Carbonaceous
emissions
from
wildfires
are
a
dynamic
mixture
of
gases
and
particles
that
have
important
impacts
on
air
quality
climate.
Emissions
feed
atmospheric
models
estimated
using
burned
area
fire
radiative
power
(FRP)
methods
rely
satellite
products.
These
approaches
show
wide
variability
large
uncertainties,
their
accuracy
is
challenging
to
evaluate
due
limited
aircraft
ground
measurements.
Here,
we
present
novel
method
estimate
plume-integrated
total
carbon
speciated
emission
rates
unique
combination
lidar
remote
sensing
aerosol
extinction
profiles
in
situ
measured
constituents.
We
strong
agreement
between
these
aircraft-derived
detailed
area-based
inventory
distributes
time
Geostationary
Operational
Environmental
Satellite
FRP
observations
(Fuel2Fire
inventory,
slope
=
1.33
±
0.04,
r2
0.93,
RMSE
0.27).
Other
more
commonly
used
inventories
strongly
correlate
with
but
wide-ranging
over-
under-predictions.
A
correlation
found
monoxide
those
derived
the
TROPOspheric
Monitoring
Instrument
(TROPOMI)
for
five
coincident
sampling
windows
(slope
0.99
0.18;
bias
28.5%).
Smoke
coefficients
(g
MJ–1)
enable
direct
estimations
primary
gas
observations,
derive
values
many
compounds
emitted
by
temperate
forest
fuels,
including
several
previously
unreported
species.
Atmospheric chemistry and physics,
Год журнала:
2022,
Номер
22(16), С. 10875 - 10900
Опубликована: Авг. 26, 2022
Abstract.
The
Tropospheric
Monitoring
Instrument
(TROPOMI)
on
the
Sentinel-5
Precursor
(S5P)
satellite
is
a
valuable
source
of
information
to
monitor
NOx
emissions
that
adversely
affect
air
quality.
We
conduct
series
experiments
using
4×4
km2
Comprehensive
Air
Quality
Model
with
Extensions
(CAMx)
simulation
during
April–September
2019
in
eastern
Texas
evaluate
multiple
challenges
arise
from
reconciling
model
simulations
TROPOMI.
find
an
increase
NO2
(+17
%
urban
areas)
when
transitioning
TROPOMI
version
1.3
algorithm
2.3.1
Texas,
greatest
difference
(+25
%)
city
centers
and
smaller
differences
(+5
less
polluted
areas.
lightning
contribute
up
24
column
areas
over
Gulf
Mexico
8%
inventories,
locally
resolved
inputs,
agree
derived
within
20
most
circumstances,
small
underestimate
Dallas–Fort
Worth
(−13
Houston
(−20
%).
In
vicinity
large
power
plant
plumes
(e.g.,
Martin
Lake
Limestone)
we
larger
disagreements,
i.e.,
consistently
by
40
%–60
than
modeled
NO2,
which
incorporates
measured
stack
emissions.
having
difficulty
distinguishing
attributed
plants
background
concentrations
–
area
atmospheric
conditions
cause
short
lifetimes.
Second,
NOx/NO2
ratio
may
be
underestimated
due
4
km
grid
cell
size.
To
understand
ozone
formation
regimes
area,
combine
formaldehyde
(HCHO)
information.
modest
low
biases
relative
HCHO,
−9
−21
central
lower
biogenic
volatile
organic
compound
(VOC)
Ozone
at
time
early
afternoon
overpass
are
limited
almost
everywhere
domain,
except
along
Ship
Channel,
near
Dallas/Fort
International
airport,
presence
undiluted
plumes.
There
likely
NOx-saturated
morning
hours
cannot
observe
would
well-suited
for
analysis
HCHO
upcoming
TEMPO
(Tropospheric
Emissions:
Pollution)
mission.
This
study
highlights
measurements
offer
means
validate
inventories
regimes,
important
limitations.
Atmospheric chemistry and physics,
Год журнала:
2023,
Номер
23(11), С. 6271 - 6284
Опубликована: Июнь 7, 2023
Abstract.
Tropospheric
nitrogen
dioxide
(NO2)
measured
from
satellites
has
been
widely
used
to
track
anthropogenic
NOx
emissions,
but
its
retrieval
and
interpretation
can
be
complicated
by
the
free
tropospheric
NO2
background
which
satellite
measurements
are
particularly
sensitive.
vertical
column
densities
(VCDs)
spaceborne
Ozone
Monitoring
Instrument
(OMI)
averaged
over
contiguous
US
(CONUS)
show
no
trend
after
2009,
despite
sustained
decreases
in
implying
an
important
rising
contribution
background.
Here,
we
use
GEOS-Chem
chemical
transport
model
applied
simulation
of
OMI
better
understand
sources
trends
CONUS.
The
previous
underestimate
is
largely
corrected
consideration
aerosol
nitrate
photolysis,
increases
VCDs
13
%
on
annual
basis
(25
spring)
also
air
mass
factor
(AMF)
convert
slant
(SCDs)
inferred
spectra
into
7
(11
spring).
increase
AMF
retrieved
observations,
contributing
improved
agreement
with
model.
Accounting
for
2009–2017
aircraft
emissions
drives
only
a
1.4
mean
CONUS
2
AMF,
combination
decreasing
surface
increasing
expected
drive
14
next
decade
that
will
necessary
account
trends.
Fire
smoke
identification
National
Oceanic
Atmospheric
Administration
(NOAA)
Hazard
Mapping
System
(HMS)
indicates
wildfires
contribute
1
%–8
western
June–September
this
since
flattening
Future
analyses
data
infer
must
critically
consider
effects
due
aircraft,
fires,
possibly
lightning.
Environmental Science & Technology,
Год журнала:
2023,
Номер
57(39), С. 14648 - 14660
Опубликована: Сен. 13, 2023
The
frequency
of
wildfires
in
the
western
United
States
has
escalated
recent
decades.
Here
we
examine
impacts
on
ground-level
ozone
(O3)
precursors
and
O3-NOx-VOC
chemistry
from
source
to
downwind
urban
areas.
We
use
satellite
retrievals
nitrogen
dioxide
(NO2)
formaldehyde
(HCHO,
an
indicator
VOC)
Tropospheric
Monitoring
Instrument
(TROPOMI)
track
evolution
O3
over
California
2018
2020.
improved
these
by
updating
a
priori
profiles
explicitly
accounting
for
effects
smoke
aerosols.
TROPOMI
observations
reveal
that
extensive
intense
fire
2020
led
overall
increase
statewide
annual
average
HCHO
NO2
columns
16%
9%.
level
offsets
anthropogenic
NOx
emission
reduction
COVID-19
lockdown.
enhancement
within
plumes
is
concentrated
near
regions
actively
burning,
whereas
far-reaching,
extending
areas
due
secondary
production
longer-lived
VOCs
such
as
ethene.
Consequently,
larger
occurs
NOx-limited
regions,
while
greater
VOC-limited
areas,
both
contributing
more
efficient
production.
Environmental Science & Technology Letters,
Год журнала:
2023,
Номер
11(2), С. 122 - 129
Опубликована: Сен. 25, 2023
Bottom-up
emission
inventories
of
atmospheric
nitrogen
oxides
(NOx
=
NO
+
NO2)
are
usually
limited
to
annual
updates
and
have
large
uncertainties.
The
recent
launch
the
Geostationary
Environmental
Monitoring
Spectrometer
(GEMS)
first
provides
hourly
measurements
trace
gas
pollutants
from
space,
enabling
new
insights
into
diurnal
variations
in
anthropogenic
NOx
emissions.
In
this
study,
we
present
an
improved
top-down
estimation
using
GEMS
NO2
observations
characterize
emissions
over
cities
East
Asia.
We
use
Gaussian
model
polynomial
fitting
calculate
lifetimes
for
several
"point-source"
then
derive
flux
divergence
method.
show
significant
Systematic
biases
estimates
found
between
GEMS-based
estimations
previous
polar-orbiting
satellites
with
a
single
daily
overpass.
Compared
empirically
factors,
chemical
simulations
substantially
reduce
satellite
surface
(e.g.,
Wuhan,
decreased
by
31%).
This
study
highlights
essential
role
geostationary
characterizing
chemistry
informing
control
policies.
Remote Sensing of Environment,
Год журнала:
2024,
Номер
312, С. 114321 - 114321
Опубликована: Июль 24, 2024
Satellite
observations
from
instruments
such
as
the
TROPOspheric
Monitoring
Instrument
(TROPOMI)
show
significant
potential
for
monitoring
spatiotemporal
variability
of
NO2,
however
they
typically
provide
vertically
integrated
measurements
over
tropospheric
column.
In
this
study,
we
introduce
a
machine
learning
approach
entitled
'S-MESH'
(Satellite
and
ML-based
Estimation
Surface
air
quality
at
High
resolution)
that
allows
estimating
daily
surface
NO2
concentrations
Europe
1
km
spatial
resolution
based
on
eXtreme
gradient
boost
(XGBoost)
model
using
primarily
observation-based
datasets
period
2019–2021.
Spatiotemporal
used
by
include
TROPOMI
vertical
column
density,
night
light
radiance
Visible
Infrared
Imaging
Radiometer
Suite
(VIIRS),
Normalized
Difference
Vegetation
Index
Moderate
Resolution
Spectroradiometer
(MODIS),
stations
European
Environment
Agency
database
modeled
meteorological
parameters
planetary
boundary
layer
height,
wind
velocity,
temperature.
The
overall
evaluation
shows
mean
absolute
error
7.77
μg/m3,
median
bias
0.6
μg/m3
Spearman
rank
correlation
0.66.
performance
is
found
to
be
influenced
concentration
levels,
with
most
reliable
predictions
levels
10–40
<40%.
temporal
analyses
indicate
robustness
across
study
area,
better
prediction
accuracy
during
winter
months
associated
higher
concentrations.
Despite
complexity
continental
scale
XGBoost-based
fast
execution
in
providing
estimates
Europe.
Shapley
Additive
exPlanations
(SHAP)
value
analysis
highlights
density
main
source
information
deriving
concentrations,
indicating
its
studies.
SHAP
values
also
importance
anthropogenic
emission
proxy
inputs
VIIRS
lights,
complementing
detailed
patterns
variations.
Atmospheric chemistry and physics,
Год журнала:
2025,
Номер
25(4), С. 2291 - 2309
Опубликована: Фев. 21, 2025
Abstract.
This
study
applies
a
mass-conserving
model-free
analytical
approach
to
daily
observations
on
grid-by-grid
basis
of
NO2
from
the
Tropospheric
Monitoring
Instrument
(TROPOMI)
rapidly
and
flexibly
quantify
changing
emerging
sources
NOx
emissions
at
high
spatial
temporal
resolution.
The
inverted
optimized
underlying
ranges
include
quantification
atmospheric
in
situ
processing,
transport,
physics.
results
are
presented
over
three
regions
China,
including
Shandong
Hubei,
which
urbanizing
not
frequently
addressed
global
literature.
day-to-day
found
be
1.96
±
0.27
µg
m−2
s−1
pixels
with
available
priori
values
(1.94
s−1),
while
1.22
0.63
extra
inventory
is
lower
than
0.3
s−1.
Source
attribution
based
thermodynamics
combustion
temperature,
processing
successfully
identifies
five
different
industrial
source
types.
Emissions
these
sites
adjacent
Yangtze
River
161.
68.9
Kt
yr−1
(163
%
higher
priori),
consistent
missing
light
medium
industries
located
along
river,
contradicting
previous
studies
attributing
water
as
emissions.
Finally,
reveal
an
uncertainty
larger
variability,
providing
quantitative
information
for
placement
future
monitoring
stations.
It
hoped
that
findings
will
drive
new
top-down
estimates,
quantified
updated
continuously
consistently
remotely
sensed
measurements
associated
uncertainties
actively
reflect
land-use
changes
misidentified
emissions,
quantifying
datasets
inform
bottom-up
community.
Atmospheric measurement techniques,
Год журнала:
2021,
Номер
14(12), С. 7929 - 7957
Опубликована: Дек. 21, 2021
Abstract.
Smoke
from
wildfires
is
a
significant
source
of
air
pollution,
which
can
adversely
impact
quality
and
ecosystems
downwind.
With
the
recently
increasing
intensity
severity
wildfires,
threat
to
expected
increase.
Satellite-derived
biomass
burning
emissions
fill
in
gaps
absence
aircraft
or
ground-based
measurement
campaigns
help
improve
online
calculation
as
well
inventories
that
feed
models.
This
study
focuses
on
satellite-derived
NOx
using
high-spatial-resolution
TROPOspheric
Monitoring
Instrument
(TROPOMI)
NO2
dataset.
Advancements
improvements
satellite-based
determination
forest
fire
are
discussed,
including
information
plume
height
effects
aerosol
scattering
absorption
satellite-retrieved
vertical
column
densities.
Two
common
top-down
emission
estimation
methods,
(1)
an
exponentially
modified
Gaussian
(EMG)
(2)
flux
method,
applied
synthetic
data
determine
accuracy
sensitivity
different
parameters,
wind
fields,
satellite
sampling,
noise,
lifetime,
spread.
These
tests
show
be
accurately
estimated
single
TROPOMI
overpasses.
The
effect
smoke
aerosols
columns
(via
mass
factors,
AMFs)
estimated,
these
estimates
compared
observations
four
measuring
plumes
2018
2019
North
America.
Our
results
indicate
applying
explicit
correction
improves
agreement
with
(by
about
10
%–25
%).
aircraft-
good
within
uncertainties.
Both
methods
work
well;
however,
EMG
method
seems
output
more
consistent
has
better
aircraft-derived
emissions.
Assuming
shape
for
various
plumes,
we
estimate
average
e-folding
time
2
±1
h
observations.
Based
chemistry
transport
model
simulations
observations,
net
1.3
1.5
times
greater
than
A
factor
should
thus
used
infer
retrievals
NO2.