City-scale
outdoor
thermal
comfort
diagnostics
is
essential
for
understanding
actual
heat
stress.
Here,
we
present
a
meso-micro
scale
urban
climate
framework
based
on
WRF-UCM
and
SOLWEIG
to
achieve
fine-grained
mapping
at
the
city
scale.
The
background
condition
affecting
simulated
by
Weather
Research
Forecasting
(WRF)
model
coupled
with
canopy
local-scale
(500m).
most
dominant
factor,
mean
radiant
temperature,
using
Solar
Longwave
Environmental
Irradiance
Geometry
(SOLWEIG)
micro-scale
(10m).
Universal
Thermal
Climate
Index
(UTCI)
then
calculated
hourly
intervals.
Three-dimensional
morphological
data
utilized
during
simulation.
We
applied
this
Chinese
city,
investigated
intra-day
variation
in
impact
of
morphology.
Through
statistical
analysis,
found
that
elevation
UTCI
primarily
attributed
increase
fraction
impervious
surface
daytime,
maximum
correlation
coefficient
0.80.
Tree
cover
has
persistent
cooling
effect
day.
Implementing
40%
tree
can
reduce
daytime
1.5
2.0
ºC.
In
contrast,
these
features
have
limited
influence
nighttime.
Environmental Research Letters,
Год журнала:
2023,
Номер
18(12), С. 124033 - 124033
Опубликована: Ноя. 7, 2023
Abstract
Rising
demand
for
space
cooling
has
been
placing
enormous
strain
on
various
technological,
environmental,
and
societal
dimensions,
resulting
in
issues
related
to
energy
consumption,
environmental
sustainability,
health
well-being,
affordability,
equity.
Holistic
approaches
that
combine
efficiency
optimization,
policy-making,
adaptation
must
be
rapidly
promoted
as
viable
timely
solutions.
We
interpret
the
30
year
climatic-induced
upward
trend
spikes
urban
from
perspective
of
climate
change,
urbanization,
background
climates,
through
lens
five
major
populated
cities:
Hong
Kong,
Sydney,
Montreal,
Zurich,
London.
An
unequivocal,
worrying
is
observed
meteorological
data,
using
degree
hours
(CDHs)
a
city-scale
metric.
The
surge
can
largely
attributed
warming
heat
islands,
with
most
abrupt
associated
intensified
extreme
events.
Further,
our
quantification
impact
base
temperature,
relation
historical
CDH,
reveals
20%
saving
could
achieved
instantly
within
rather
broad
range
air
temperature
relative
humidity
by
increasing
setpoint
one
degree.
With
rise
temperatures
due
potential
diminishes
same
level
increase
temperature.
For
instance,
an
26
°C
27
results
about
10%
savings,
while
22
23
yield
over
savings.
To
reduce
climate,
we
highlight
necessity
promoting
hard
soft
behavioral
along
regulatory
intervention
operation
systems.
Environmental Research Letters,
Год журнала:
2024,
Номер
19(6), С. 064002 - 064002
Опубликована: Апрель 30, 2024
Abstract
We
introduce
a
novel
methodological
advancement
by
clustering
paired
near-surface
air
temperature
with
the
planetary
boundary
layer
height
to
characterize
intra-city
clusters
for
analytics.
To
illustrate
this
approach,
we
analyze
three
heatwaves
(HWs):
2019
HW
in
Paris,
2018
Montreal,
and
2017
Zurich.
assess
cluster-based
characteristics
before,
during,
after
heatwave
events.
While
urban
identified
align
well
built-up
areas
obtained
from
Moderate
Resolution
Imaging
Spectroradiometer
(MODIS)
land
cover
data,
additional
local
hot
spots
spanning
several
kilometers
can
also
be
recognized,
extending
outside
areas.
Using
objective
hysteresis
model,
further
determine
overall
strength
coefficient
of
loop
between
ground
storage
flux
all-wave
downward
radiative
flux,
ranging
0.414
0.457
0.126
0.157
rural
during
periods.
Across
all
cities,
observe
consistent
refueling-restoration
mode
cumulative
heat
as
progress.
Future
developments
proposed
two-component
integration
more
influential
physics
advances
spatial
temporal
resolutions,
will
offer
comprehensive
characterization
cities
climate
Journal of Geophysical Research Atmospheres,
Год журнала:
2025,
Номер
130(2)
Опубликована: Янв. 16, 2025
Abstract
Heatwave
preconditioned‐heavy
rainfall
(HW_HR),
a
preconditioned
compound
event,
can
cause
more
damage
than
single
heatwave
or
rainstorm.
Both
heatwaves
and
rainstorms
be
exacerbated
by
the
presence
of
cities,
but
response
their
compounding
to
urbanization
remains
unclear
especially
at
hourly
scale.
Here,
we
investigate
spatial
temporal
responses
HW_HR
typical
urban
agglomeration,
Pearl
River
Delta,
using
observations
scenario‐based
numerical
simulations.
Compared
rural
areas,
show
that
in
areas
has
higher
probability
occurrence
mean
intensity,
its
diurnal
cycle
frequency
is
narrower,
peaking
afternoon.
The
intensity
effects
most
significant,
with
urbanization‐induced
increase
being
five
times
non‐heatwave
(noHW_HR).
Our
simulations
support
suggest
changes
are
intense
spatially
heterogeneous
relatively
weak
continuous
noHW_HR.
also
preconditioning
not
only
amplifies
key
variables
alter
atmospheric
conditions
provides
pre‐storm
unstable
environment
for
urban‐induced
warm‐dry
surface
trigger
enhance
convection.
sub‐daily
suggests
preconditioning‐induced
thermodynamic
gradually
decrease,
whereas
dynamic
as
event
approaches.
study
highlights
importance
understanding
on
events,
providing
new
insights
into
role
preconditions
water
cycle.
Geophysical Research Letters,
Год журнала:
2025,
Номер
52(6)
Опубликована: Март 10, 2025
Abstract
Although
both
urban
and
rural
temperatures
are
expected
to
increase
under
heat
waves
(HWs),
whether
the
island
(UHI)
intensity
becomes
stronger
HWs
remains
unknown
especially
at
daily
mean
large
spatial
scales.
Using
an
urbanized
land
surface
model,
we
quantify
interactions
between
UHIs
over
Contiguous
United
States
(CONUS).
Synergistic
(i.e.,
increased
UHI
intensities
HWs)
observed
eastern
western
U.S.
However,
negative
found
in
Central
due
inhibition
of
evapotranspiration
by
vapor
pressure
deficit
(VPD)
stresses.
The
will
be
further
reduced
along
with
elevated
VPD
stresses
a
hotter
future.
results
highlight
importance
properly
parameterizing
sensitivity
various
environmental
climate
earth
system
models.
Sustainability,
Год журнала:
2025,
Номер
17(7), С. 3117 - 3117
Опубликована: Апрель 1, 2025
The
increasing
number
of
heat
wave
(HW)
days,
combined
with
the
urban
island
(UHI)
phenomenon,
poses
a
threat
to
health
and
comfort
city
residents.
This
study
investigates
impact
HWs
on
diurnal
cycles
intensity
spatial
structure
atmospheric
UHI
(AUHI)
surface
(SUHI).
A
comparative
analysis
is
conducted
simultaneous
night–day
variability
AUHI
SUHI
intensities
in
Kraków
two
24
h
summer
periods:
one
representing
normal
conditions
(Period
W)
other
HW
H).
Evaluating
sub-daily
patterns
based
integrated
situ
satellite
data
relatively
novel
approach.
utilizes
(1)
air
temperature
from
21
measurement
points
located
different
local
climate
zones
vertical
(altitude)
zones;
(2)
land
six
NOAA/AVHRR
images.
findings
indicate
that
were
generally
up
3
°C
higher
at
night
lower
during
daytime
Period
H
compared
W,
particularly
valley
floor.
These
results
provide
valuable
insights
into
increased
load
risk
due
co-occurrence
HW,
implications
for
sustainable
planning
strategies.
Remote Sensing,
Год журнала:
2025,
Номер
17(10), С. 1728 - 1728
Опубликована: Май 15, 2025
The
impact
of
urbanization
on
the
spatial
distribution
extreme
precipitation
has
become
a
major
topic
in
field
urban
hydrology.
This
study
used
an
canopy
model
(UCM)
coupled
with
Weather
Research
and
Forecasting
(WRF)
to
analyze
two
events
experienced
by
Pearl
River
Delta
12–13
June
(monsoon
rainstorm)
16–17
September
(typhoon
2018.
results
showed
that
both
experiments,
considering
UCM
not
UCM,
can
effectively
simulate
agglomeration.
root
mean
square
errors
simulation
observation
data
scheme
were
14.6
mm
16.7
mm,
respectively,
indicating
relatively
high
accuracy.
simulated
amounts
for
rainfall
increased
2.3
3.0
respectively.
compared
agricultural
land,
built-up
land
have
temperature
increases
approximately
0.7
°C
1
°C,
air-specific
humidity
0.5
g/kg
1.2
g/kg,
These
differences
between
NON
simulations
confirm
increase
near-surface
air
significantly
enhances
intensity
