Abstract.
Assessing
long-range
transport
(LRT)
of
pollutants
recognizes
that
multiple
sources
varying
scale
and
location
can
impact
air
quality.
In
the
Aburrá
Valley,
Colombia,
other
cities
in
Northern
South
America,
biomass
burning
(BB),
dust,
volcanic
degassing
have
been
identified
as
LRT
aerosols.
However,
these
on
quality
their
characterization
yet
to
be
thoroughly
studied.
This
work
investigates
influence
chemical
composition
PM2.5
during
annual
intra-annual
high-load
aerosol
events.
We
identified,
tracked,
meteorologically
characterized
events
evaluated
concentration
composition.
ran
a
Positive
Matrix
Factorization
(PMF)
for
each
kind
event,
identifying
high
contribution
organic
carbon
(OC1,
OC2),
F-
secondary
aerosols
trace
SO42-
NO3-
BB
events,
crustal
mineral
along
with
Ti
Ca
dust
SO42-,
Na,
Al
The
increasing
some
ions
toxic
heavy
metals
(Cr,
Mn,
Cd,
Ni)
were
also
related
influence.
During
fraction
dominates
by
frequency
amount,
averaging
11.14
μg
/
m3
(38
%).
On
average,
contribute
6.77
m3
(34
%)
6.46
μg
/
(30
concentrations.
Of
three,
showed
fewer
affected
days.
study
highlighted
hotspot
zones
such
Orinoco
Middle
Magdalena
Valley
aerosols,
Caribbean
Nevado
del
Ruíz
volcano
gives
insights
future
modeling
studies
region
supports
strategies
manage
internal
external
pollution
effects
region.
ISPRS International Journal of Geo-Information,
Год журнала:
2023,
Номер
12(10), С. 436 - 436
Опубликована: Окт. 23, 2023
Recent
times
have
witnessed
wildfires
causing
harm
to
both
ecological
communities
and
urban–rural
regions,
underscoring
the
necessity
comprehend
wildfire
triggers
assess
measures
for
mitigation.
This
research
hones
in
on
Cartagena
del
Chairá,
diving
into
interplay
between
meteorological
conditions
land
cover/use
that
cultivates
a
conducive
environment
wildfires.
Meteorologically,
prevalence
of
is
concentrated
during
boreal
winter,
characterized
by
warm
dry
air,
strong
winds,
negligible
precipitation.
Additionally,
gravitate
toward
river-adjacent
locales
housing
agriculture-linked
shrubs,
notably
northern
part
zone,
where
confluence
attributes
factors
synergize
promote
fire
incidents.
Employing
climate
scenarios,
we
deduced
elevated
temperature
reduced
humidity
augment
susceptibility,
while
wind
speed
precipitation
discourage
their
propagation
across
most
scenarios.
The
trajectory
warmer
could
instigate
fire-friendly
summer,
indicating
potential
year-round
susceptibility.
Subsequently,
via
machine-learning-driven
sensitivity
analysis,
discerned
among
scrutinized
socio-economic
variables,
GINI,
low
educational
attainment,
displacement
armed
groups
wield
substantial
influence
occurrence.
Ultimately,
these
findings
converge
shape
proposed
mitigation
strategies
amalgamate
existing
practices
with
enhancements
or
supplementary
approaches.
Geoscientific model development,
Год журнала:
2024,
Номер
17(20), С. 7467 - 7512
Опубликована: Окт. 28, 2024
Abstract.
A
multiscale
modeling
ensemble
chain
has
been
assembled
as
a
first
step
towards
an
air
quality
analysis
and
forecasting
(AQF)
system
for
Latin
America.
Two
global
three
regional
models
were
tested
compared
in
retrospective
mode
over
shared
domain
(120–28°
W,
60°
S–30°
N)
the
months
of
January
July
2015.
The
objective
this
experiment
was
to
understand
their
performance
characterize
errors.
Observations
from
local
monitoring
networks
Colombia,
Chile,
Brazil,
Mexico,
Ecuador
Peru
used
model
evaluation.
generally
agreed
with
observations
large
cities
such
Mexico
City
São
Paulo,
whereas
representing
smaller
urban
areas,
Bogotá
Santiago,
more
challenging.
For
instance,
Santiago
during
wintertime,
simulations
showed
discrepancies
observations.
No
single
demonstrated
superior
others
or
among
pollutants
sites
available.
In
general,
ozone
NO2
exhibited
lowest
bias
errors,
especially
Paulo
City.
SO2,
error
close
200
%,
except
Bogotá.
ensemble,
created
median
value
all
models,
evaluated
well.
some
cases,
outperformed
individual
mitigated
extreme
over-
underestimation.
However,
research
is
needed
before
concluding
that
path
AQF
This
study
identified
certain
limitations
emission
inventories,
which
should
be
addressed
involvement
experience
researchers.
Atmospheric chemistry and physics,
Год журнала:
2024,
Номер
24(20), С. 11497 - 11520
Опубликована: Окт. 16, 2024
Abstract.
Long-range
transport
(LRT)
of
air
pollutants
from
a
range
sources
can
substantially
enhance
background
pollution
levels,
especially
in
urbanized
regions,
which
exacerbate
high-pollution
episodes.
In
the
Aburrá
Valley
(AV),
Colombia,
and
other
cities
northern
South
America,
biomass
burning
(BB),
dust,
volcanic
degassing
have
been
identified
as
long-range
aerosol
transport.
However,
impact
these
on
quality
characterization
yet
to
be
thoroughly
studied.
This
work
investigates
influence
chemical
composition
PM2.5
during
annual
intra-annual
high-load
events
AV.
We
identified,
tracked,
meteorologically
characterized
LRT
evaluated
their
concentration
composition.
found
that
aerosols
BB,
influenced
approximately
13
%,
8
%
days
year,
respectively.
applied
positive-matrix-factorization
(PMF)
statistical
model
quantify
concentrations
compositions
for
different
event
types
(e.g.,
BB).
For
BB
events,
we
large
contributions
organic
carbon
(OC1
OC2),
F−,
secondary
tracers
(SO42-
NO3-).
dust
crustal
mineral
components,
along
with
Ti
Ca,
were
primary
contributors
composition,
while
SO42-,
Na,
Al,
Ca
events.
The
some
ions
toxic
heavy
metals
(Cr,
Mn,
Cd,
Ni)
also
elevated
volcanic-degassing
contributed
most
levels
(∼11
µg
m−3),
arising
substantial
(<7
m−3).
Our
study
identifies
Orinoco
Middle
Magdalena
sizable
Nevado
del
Ruiz
source
aerosols.
Additionally,
African
reached
Andean
region
via
Caribbean
route.
As
result,
identify
need
future
chemical-transport
modeling
studies
new
support
strategies
manage
internal
external
degrade
AV
surrounding
region.
Journal of Advances in Modeling Earth Systems,
Год журнала:
2025,
Номер
17(3)
Опубликована: Март 1, 2025
Abstract
Recently,
Biagioli
and
Tompkins
(2023,
https://doi.org/10.1029/2022ms003231
)
used
a
simple
stochastic
model
to
derive
dimensionless
parameter
predict
convective
self
aggregation
(SA)
development,
which
was
based
on
the
derivation
of
maximum
free
distance
expected
in
pre‐aggregated,
random
state.
Our
goal
is
test
further
investigate
this
hypothesis,
namely
that
can
SA
occurrence,
using
an
ensemble
24
distinct
combinations
horizontal
mixing,
planetary
boundary
layer
(PBL),
microphysical
parameterizations.
We
conclude
key
impact
parameterization
schemes
through
their
control
number
cores
relative
spacing,
,
itself
impacted
by
cold‐pool
(CP)
properties
mean
updraft
core
size.
more
likely
when
count
small,
while
CPs
modify
spacing
via
suppression
interiors
triggering
gust‐front
convergence
collisions.
Each
scheme
emphasizes
different
mechanism.
Subgrid‐scale
turbulent
mixing
mainly
affects
determination
size
thus
spacing.
The
sensitivity
microphysics
rain
evaporation
subsequent
CPs,
perturbations
ice
cloud
have
limited
effect.
Non‐local
PBL
promote
primarily
increasing
inhibition
inversion
entrainment
altering
low
amounts,
leading
fewer
larger
.
Atmosphere,
Год журнала:
2025,
Номер
16(4), С. 439 - 439
Опубликована: Апрель 9, 2025
Efficiently
mapping
hourly
air
quality
at
a
fine
scale
(25
m)
remains
computational
challenge.
This
difficulty
is
heightened
when
aiming
to
accurately
capture
industrial
plumes
and
time-varying
traffic
emissions.
paper
presents
method
for
generating
pollutant
concentration
maps
across
an
entire
region
operational
applications.
Our
approach
assumes
that
can
be
decomposed
into
three
components:
concentrations,
concentrations
residual
“background”
component.
The
background
estimated
using
established
fine-scale
methods
involving
ADMS-Urban
dispersion
simulations.
Meanwhile,
the
layers
are
derived
KNN-based
applied
sample
of
enhances
representation
temporal
variability
in
emissions
while
maintaining
efficiency,
making
it
suitable
production
Hauts-de-France
(France).
