This
study
aimed
to
analyze
the
shading
effect
of
single
trees
on
human
thermal
sensation
(HTS)
during
summer.
Microclimatic
data
were
collected
and
analyzed
in
both
sunny
shaded
locations
for
four
tree
species:
one
deciduous
broadleaf
(DBT),
two
evergreen
(EBT),
coniferous
(ECT).
The
results
showed
relatively
small
differences
air
temperature,
relative
humidity,
wind
speed
among
mean
0.1-0.5
℃,
0.5-1.8
%,
0.0-0.7
ms⁻¹,
respectively.
However,
there
was
a
significant
difference
radiant
18.6
℃.
Regarding
HTS
indices
(PET
UTCI),
exhibited
reduction
rates
15.4-20.6
%
PET,
corresponding
perception
1.0-1.5
levels.
UTCI
9.7-12.5
equivalent
heat
stress
0.6-0.7
ECT
demonstrated
higher
with
1.3
3.5
than
DBT
EBT,
EBT
similar
as
due
its
high
leaf
density.
Based
these
findings,
temperature
density
are
primary
factors
influencing
effects
Ecological Indicators,
Год журнала:
2023,
Номер
158, С. 111424 - 111424
Опубликована: Дек. 16, 2023
The
urban
thermal
environment
is
closely
related
to
the
well-being
of
many
city
dwellers.
Rich
achievements
have
been
obtained
for
canopy
layer
heat
island
(CLUHI)
studies.
Nevertheless,
monitoring
and
associated
factors
CLUHI
not
systematically
timely
reviewed.
Therefore,
this
paper
aimed
solve
issue
some
extent
by
reviewing
fruitful
research
progress
from
above-mentioned
two
aspects.
main
findings
were
as
follows.
(1)
Eight
methods
adopted
obtain
near-surface
temperature
data
research,
including
four
observation,
numerical
modeling,
remote
sensing
assimilation
methods.
(2)
Air
was
usually
used
rather
than
apparent
indices.
Obvious
differences
existed
between
them,
especially
under
humid
hot
or
cold
windy
conditions.
(3)
intensity
generally
defined
in
suburban
rural
stations
regions
population,
land
cover/land
use,
etc,
derived
using
regression
analysis
impervious
surface
percentage.
(4)
diurnal,
monthly,
seasonal
interannual
variation
has
analyzed
various
global
regions.
(5)
Six
types
analyzed,
meteorological
conditions,
air
pollution,
socioeconomic
factors,
underlying
condition,
inland
coastal
type
landform
combined
effects
factors.
(6)
Five
potential
directions
proposed,
improvement
acquisition,
sharing
considering
indices,
focus
on
rarely
studied
regions,
cities
scales,
improving
calculation
intensity,
attention
more
driving
force
This
review
can
provide
references
future
construction
climate-resilient,
livable,
low-carbon
cities.
Asia-Pacific Journal of Atmospheric Sciences,
Год журнала:
2024,
Номер
unknown
Опубликована: Апрель 2, 2024
Abstract
This
study
examines
the
characteristics
of
urban
heat
island
(UHI)
in
Dhaka,
densely
populated
capital
city
Bangladesh
under
influence
South
Asian
monsoon,
and
its
interaction
with
waves.
For
this,
meteorological
data
at
Dhaka
(urban)
Madaripur
(rural)
stations
reanalysis
for
period
1995–2019
are
used
analysis.
Here,
UHI
intensity
is
defined
as
urban-rural
difference
2-m
temperature,
a
wave
phenomenon
which
persists
two
or
more
consecutive
days
daily
maximum
temperature
exceeding
90th
percentile.
The
an
increasing
trend
over
past
25
years
(0.21
°C
per
decade).
average
0.48
°C.
strongest
winter
(0.95
°C)
weakest
monsoon
season
(0.23
°C).
In
all
seasons,
2100
LST.
2.15
Through
multiple
linear
regression
analysis,
relative
importance
previous-day
(PER),
wind
speed,
humidity
(RH),
cloud
fraction
affect
examined.
pre-monsoon
season,
RH
most
important
variable
followed
by
PER.
predominantly
variable.
post-monsoon
winter,
PER
RH.
occurrence
frequency
waves
shows
statistically
significant
(5.8
It
found
that
associated
mid-to-upper
tropospheric
anticyclonic-flow
high-pressure
anomalies
low-to-mid
season.
Under
waves,
synergistically
intensified
both
daytime
nighttime
(nighttime
only)
(monsoon)
decreases
favorable
synergistic
UHI-heat
interaction.
Geophysical Research Letters,
Год журнала:
2024,
Номер
51(11)
Опубликована: Июнь 11, 2024
Abstract
This
study
investigates
the
responses
of
urban
atmospheric
thermal
environment
to
two
distinct
heat
waves
in
Hefei,
China,
and
explores
potential
changes
associated
with
future
expansion.
During
Event
1,
characterized
by
clear
dry
conditions,
western
Pacific
subtropical
high
limits
water
vapor
influx,
resulting
a
significant
cooling
effect
rural
area
due
higher
surface
latent
flux.
The
island
(UHI)
intensity,
calculated
using
temperature
2‐m
temperature,
reaches
5.2°C
1.7°C
during
respectively.
Although
2,
cloudy
humid
exhibits
weaker
UHI
effects,
it
remains
highly
unfavorable
for
human
comfort.
waves,
vertical
extent
warming
induced
expansion
varies,
which
can
be
attributed
environmental
factors,
such
as
stability
near‐surface
wind
speed.
Urban Climate,
Год журнала:
2024,
Номер
56, С. 102050 - 102050
Опубликована: Июль 1, 2024
The
synergistic
interactions
between
urban
heat
islands
(UHIs)
and
waves
are
of
great
concern
due
to
their
adverse
impacts
on
residents
scientific
interest.
Here,
we
examine
the
UHIs
with
two
types
waves,
dry
(DHW)
moist
(MHW).
For
this,
Daegu,
a
large
city
in
South
Korea,
is
selected
observational
reanalysis
data
from
2001
2022
analyzed.
DHW
(MHW)
defined
as
daily
mean
relative
humidity
lower
(higher)
than
its
10th
(90th)
percentile.
nighttime
UHI
intensity
calculated
using
minimum
2-m
temperatures
stronger
under
by
1.07
°C
weaker
MHW
0.24
non-heat
waves.
This
indicates
DHW,
but
negative
MHW.
Evaluation
four
thermal
discomfort
indices
shows
that
prominent
UHI-heat
wave
can
result
similar
or
even
greater
stress
compared
for
residents,
despite
humidity.
study
highlights
necessity
considering
characteristics
consequent
assessing
managing
heat-related
risks.
