Research Square (Research Square),
Journal Year:
2022,
Volume and Issue:
unknown
Published: Nov. 21, 2022
Abstract
Permafrost
thaw
can
cause
an
intensification
of
climate
change
through
the
release
carbon
as
greenhouse
gases.
While
effect
air
temperature
on
permafrost
is
well
quantified,
rainfall
highly
variable
and
not
understood.
Here,
we
provide
first
meta-analysis
studies
reporting
effects
ground
temperatures
in
environments
use
a
numerical
model
to
explore
underlying
physical
mechanisms
under
different
climatic
conditions.
Both
evaluated
body
literature
simulations
indicate
that
continental
climates
are
likely
show
warming
subsoil
hence
increased
end
season
active
layer
thickness,
while
maritime
tend
respond
with
slight
cooling
effect.
This
suggests
dry
regions
warm
summers
prone
more
rapid
degradation
occurrences
heavy
events
future,
which
potentially
accelerate
feedback.
Journal of Geophysical Research Atmospheres,
Journal Year:
2024,
Volume and Issue:
129(20)
Published: Oct. 22, 2024
Abstract
Soil
freeze‐thaw
cycles
play
a
critical
role
in
ecosystem,
hydrological
and
biogeochemical
processes,
climate.
The
Tibetan
Plateau
(TP)
has
the
largest
area
of
frozen
soil
that
undergoes
low‐mid
latitudes.
Evidence
suggests
ongoing
changes
seasonal
during
past
several
decades
on
TP.
However,
status
diurnal
(DFTC)
shallow
their
response
to
climate
change
largely
remain
unknown.
In
this
study,
using
in‐situ
observations,
latest
reanalysis,
machine
learning,
physics‐based
modeling,
we
conducted
comprehensive
assessment
spatiotemporal
variations
DFTC
upper
Brahmaputra
(UB)
basin.
About
24
±
8%
basin
is
subjected
with
mean
frequency
87
55
days
1980–2018.
show
small
long‐term
Air
temperature
impacts
center
mainly
around
freezing
point
(0°C).
spatial
air
can
primarily
be
explained
by
three
factors:
precipitation
(30.4%),
snow
depth
(22.6%)
warming/cooling
rates
(14.9%).
Both
rainfall
events
reduce
fluctuations
temperature,
subsequently
reducing
frequency,
decreasing
daytime
through
evaporation‐cooling
albedo‐cooling
effects,
respectively.
These
results
provide
an
in‐depth
understanding
its
change.
Journal of Cold Regions Engineering,
Journal Year:
2024,
Volume and Issue:
38(2)
Published: April 5, 2024
The
Qinghai–Tibet
Plateau
shows
an
obvious
trend
of
warming
and
humidification,
the
increased
rainfall
is
mainly
concentrated
in
summer.
There
have
been
few
reports
on
effects
summer
variations
hydrothermal
states
embankments
permafrost
regions.
Therefore,
based
indoor
embankment-scale
model
experiment,
surface
energy,
temperature,
water
fields
highway
regions
were
investigated.
results
showed
that
led
to
increase
net
radiation.
However,
a
decreasing
pavement
temperature
shallow
heat
flux
embankment,
indicating
could
effectively
inhibit
temperature.
Simultaneously,
also
content
at
different
locations
embankment
following
order:
natural
site
>
shoulder
slope
pavement.
maximum
was
6.7%
after
twofold
rainfall.
In
addition,
within
exhibited
with
Compared
other
parts
although
relatively
small
lower
part
pavement,
asphalt
concrete
had
higher
when
acts
as
energy
cold
pulse
decreases
more
significantly
than
embankment.
affected
cooling
range
slope.
hysteresis
effect
autumn.
Atmosphere,
Journal Year:
2023,
Volume and Issue:
14(2), P. 296 - 296
Published: Feb. 1, 2023
The
climate
of
the
Qinghai–Tibet
Plateau
is
distinct.
Given
large
temperature
difference
between
day
and
night,
drought
in
perennial
years,
low
rainfall
evaporation
volume,
frozen
soil
some
areas
will
occur
salt.
presence
salt
changes
water
thermal
characteristics
soil,
which
affect
its
activity
layer.
In
this
paper,
Beiluhe
area
was
selected
as
research
object,
numerical
calculation
model
water,
heat
salinised
established.
Considering
influence
crystallisation
on
freezing
active
layer,
effects
different
concentrations,
contents
type
thickness
layer
were
compared
analysed.
Therefore,
degenerates
under
action
sodium
chloride
sulphate,
sulphate
not
conducive
to
stability
for
many
years.
During
salinisation,
content
increases;
permafrost
initially
decreases
then
initial
time
postponed
cooling
stages,
when
with
a
concentration
0.2–0.8%
delayed
by
21,
32,
54
65
days;
decreases,
opposite
thawing
heating
increases
increase
concentration.
finally
contrary
warm
season.
(with
maximum
0.82
m)
has
little
effect
High
permafrost.
When
constant,
change
smaller;
season
lower;
smaller,
tends
be
more
stable.
generally
reduces
warm-season
(−6
m
30%
40%
−6
0.17
°C
0.24
lower
than
that
20%
content).
However,
analysis
containing
must
combine
temperature.
The Science of The Total Environment,
Journal Year:
2024,
Volume and Issue:
943, P. 173696 - 173696
Published: June 5, 2024
Together
with
warming
air
temperatures,
Arctic
ecosystems
are
expected
to
experience
increases
in
heavy
rainfall
events.
Recent
studies
report
accelerated
degradation
of
permafrost
under
rainfall,
which
could
put
significant
amounts
soil
carbon
and
infrastructure
at
risk.
However,
controlled
experimental
evidence
effects
on
thaw
is
scarce.
We
experimentally
tested
the
impact
legacy
effect
events
early
late
summer
for
five
sites
varying
topography
type
High
archipelago
Svalbard.
found
that
thermal
regimes
small
limited
one
season.
Thaw
rates
increased
a
loess
terrace
site,
but
not
polygonal
tundra
soils
higher
organic
matter
content
water
tables.
End-of-season
active
layer
thickness
was
affected.
Rainfall
application
did
affect
temperature
trends,
appeared
driven
by
timing
snowmelt
thickness,
particularly
during
summer.
Late
associated
slower
freeze-up
colder
temperatures
following
winter.
This
implies
impacts
Svalbard
limited,
locally
variable
short
duration.
Our
findings
diverge
from
earlier
reports
sustained
extreme
consistent
observations
maritime
regions
such
as
show
lower
sensitivity
than
continental
regions.
Based
our
experiment,
no
substantial
in-situ
anticipated
thawing
future
warming.
further
work
needed
quantify
response
local
redistribution
flow
natural
extremes.
In
addition,
replication
experiments
across
well
long-term
monitoring
layers,
moisture
climate
will
be
essential
develop
panarctic
perspective
permafrost.
IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing,
Journal Year:
2023,
Volume and Issue:
16, P. 6902 - 6916
Published: Jan. 1, 2023
The
SM2RAIN
(Soil
Moisture
to
Rain)
model
has
been
widely
used
for
rainfall
estimation
worldwide.
However,
due
the
lack
of
sufficient
ground
observation,
driven
by
different
passive
microwave
soil
moisture
products
over
Tibetan
Plateau
not
fully
validated.
In
this
paper,
four
satellite
(including
SMAP,
ASCAT,
SMOS,
and
AMSR2)
were
as
input
data
estimation.
Rainfall
from
eight
observation
stations
during
2016-2018
evaluate
overall
performance
algorithm
under
various
at
time
aggregation
(AGGR)
scales.
addition,
merged
whether
combined
could
improve
model.
Finally,
estimates
with
further
evaluated
compared
two
benchmark
(IMERG
ERA5).
Results
indicate
that:
(1)
Overall,
SM2RAIN-SMAP
highest
accuracy,
but
scale
up
30
days,
mean
R
reach
above
0.8
value
Kling-Gupta
Efficiency
(KGE)
0.8.
(2)
Combined
can
significantly
estimates.
performed
best
when
SMAP
ASCAT
combined.
(3)
Using
product
or
yielded
more
accurate
than
