Geofluids,
Год журнала:
2022,
Номер
2022, С. 1 - 16
Опубликована: Июль 28, 2022
The
Qinghai-Tibetan
Plateau
(QTP)
has
undergone
an
increase
in
rainfall
and
a
drastic
alteration
the
moisture-heat
regime
active
layers
engineering.
To
investigate
water
heat
responses
of
natural
ground
engineering
to
rainfall,
differences
energy
on
surface
thermal-moisture
dynamics
different
permafrost
underlying
surfaces
were
discussed.
Based
meteorological
data
2013
observed
at
Beiluhe
observation
station,
three
types
(i.e.,
ground,
asphalt
pavement,
gravel
pavement)
selected
compare
balance
surface,
water-energy
transport
process,
coupling
mechanism
under
conditions
by
coupled
vapor-heat
model
unsaturated
frozen
soil.
results
show
that
pavement
greatly
increases
net
radiation
soil
flux,
decreases
evaporation
latent
heat,
cuts
off
moisture
migration
between
atmosphere
layer.
significantly
lower
amount
shallow
is
strongly
influenced
evaporation.
Therefore,
accumulation
are
dominated
vapor
flux
thermal
gradients,
whereas
liquid
potential
gradients
major
source
pavement.
transfer
layer
conduction.
effect
conduction,
migration,
phase
transition
temperature
evident
for
while
impact
significant
thawing
period.
As
result,
relationship
pavement>gravel
pavement>natural
ground.
thickness
gradually
decreases.
Although
infiltration
promotes
convection
decrease
less
than
conductivity.
In
general,
construction
accelerates
degradation
permafrost.
can
provide
theoretical
simulated
guidance
stability
prediction
analysis
various
central
QTP
where
increasing.
Nature Communications,
Год журнала:
2023,
Номер
14(1)
Опубликована: Июнь 16, 2023
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
a
literature
review
studies
reporting
effects
ground
temperatures
in
environments
use
numerical
model
to
explore
underlying
physical
mechanisms
under
different
climatic
conditions.
Both
evaluated
body
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.
The cryosphere,
Год журнала:
2022,
Номер
16(3), С. 825 - 849
Опубликована: Март 11, 2022
Abstract.
Convective
heat
transfer
(CHT)
is
one
of
the
important
processes
that
control
near-ground
surface
in
permafrost
areas.
However,
this
process
has
often
not
been
considered
most
studies,
and
its
influence
on
freezing–thawing
active
layer
lacks
quantitative
investigation.
The
Simultaneous
Heat
Water
(SHAW)
model,
few
land
models
which
CHT
well
incorporated
into
soil
heat–mass
transport
processes,
was
applied
study
to
investigate
impacts
thermal
dynamics
at
Tanggula
station,
a
typical
site
eastern
Qinghai–Tibet
Plateau
with
abundant
meteorological
temperature
moisture
observation
data.
A
experiment
carried
out
quantify
changes
affected
by
vertical
advection
liquid
water.
Three
experimental
setups
were
used:
(1)
original
SHAW
model
full
consideration
CHT,
(2)
modified
ignores
due
infiltration
from
surface,
(3)
completely
system.
results
show
events
occurred
mainly
during
thaw
periods
melted
shallow
(0–0.2
m)
intermediate
(0.4–1.3
depths,
their
depths
significantly
greater
spring
melting
than
summer.
impact
minimal
freeze
deep
layers.
During
periods,
temperatures
simulated
under
scenario
considering
average
about
0.9
0.4
∘C
higher,
respectively,
scenarios
ignoring
CHT.
ending
dates
zero-curtain
effect
substantially
advanced
when
heating
effect.
opposite
cooling
also
present
but
as
frequently
upward
fluxes
differences
between
In
some
flow
cold
reduced
depth
an
−1.0
−0.4
∘C,
respectively.
overall
annual
flux
increase
favor
thawing
frozen
ground
site.
Research in Cold and Arid Regions,
Год журнала:
2024,
Номер
16(4), С. 159 - 169
Опубликована: Июль 18, 2024
Due
to
the
great
influences
of
both
climate
warming
and
human
activities,
permafrost
on
Qinghai-Xizang
Plateau
(QXP)
has
been
undergoing
considerable
degradation.
Continuous
degradation
plateau
dramatically
modifies
regional
water
cycle
hydrological
processes,
affecting
hydrogeological
conditions,
ground
hydrothermal
status
in
cold
regions.
Permafrost
thawing
impacts
ecological
environment,
engineering
facilities,
carbon
storage
functions,
releasing
some
major
greenhouse
gases
exacerbating
change.
Despite
utilization
advanced
research
methodologies
investigate
changing
processes
corresponding
influencing
factors
regions,
there
still
exist
knowledge
gaps
multivariate
data,
quantitative
analysis
degradation's
impact
various
bodies,
systematic
modeling
QXP.
This
review
summarizes
main
methods
hydrology
elaborates
precipitation
distribution
patterns,
changes
surface
runoff,
expansion
thermokarst
lakes/ponds,
groundwater
dynamics
Then,
we
discuss
current
inadequacies
future
priorities,
including
multiple
methods,
observation
spatial
temporal
scales,
provide
a
reference
for
comprehensive
environmental
effects
QXP
under
climate.
Water Resources Research,
Год журнала:
2024,
Номер
60(7)
Опубликована: Июль 1, 2024
Abstract
This
study
investigates
the
temporal
processes
of
suprapermafrost
groundwater
(SPG)‐supplied
streamflow
in
alpine
permafrost
regions,
aiming
to
fill
gap
understanding
this
process
from
a
water‐age
perspective.
Precipitation,
streamflow,
and
SPG
samples
were
collected
Three‐Rivers
Headwaters
Region
(TRHR).
We
defined
physical
meaning
F
yw
(the
young
water
fraction)
calculated
it
for
first
time.
The
results
showed
that
TRHR,
mean
travel
time
(MTT)
was
159
days,
approximately
46.4%
younger
than
77
whereas
MTT
342
12.2%
97
days.
correlation
analysis
revealed
various
climatic
factors
played
dominant
roles
recharge
variations
SPG‐supplied
within
TRHR.
rate
did
not
significantly
affect
;
however,
thickness
active
layer
ultimately
controlled
transit
distribution.
Regression
further
demonstrated
nonlinear
impact
precipitation,
average
temperature,
freezing
days
on
,
which
is
closely
related
seasonal
freeze–thaw
heat
conduction
advection
layer.
During
initial
ablation
period,
primarily
recharged
by
SPG,
resulting
short‐tail
Our
findings
provide
valuable
insights
into
runoff
generation
concentration
regions
have
important
implications
resource
management.
The cryosphere,
Год журнала:
2022,
Номер
16(12), С. 5023 - 5040
Опубликована: Дек. 20, 2022
Abstract.
Global
warming
has
significantly
impacted
the
hydrological
processes
and
ecological
environment
in
permafrost
regions.
Mean
residence
time
(MRT)
is
a
fundamental
catchment
descriptor
that
provides
information
regarding
storage,
flow
pathways,
water
source
within
particular
catchment.
However,
stable
isotopes
MRT
have
rarely
been
investigated
due
to
limited
data
collection
high-altitude
This
study
uses
long-term
isotopic
observations
identify
runoff
components
applied
sine-wave
exponential
model
estimate
(5300
m
a.s.l.)
central
Tibetan
Plateau
(TP).
We
found
isotope
composition
precipitation,
stream,
supra-permafrost
exhibited
obvious
seasonal
variability.
The
freeze–thaw
process
of
active
layer
direct
input
precipitation
modified
compositions
stream
water.
hydrograph
separation
revealed
accounted
for
35
±
2
%
65
total
discharge
water,
respectively.
was
estimated
at
100
255
d,
Such
shorter
MRTs
(compared
non-permafrost
catchments)
might
reflect
unique
characteristics
catchments.
Moreover,
more
sensitive
environmental
change
than
Climate
vegetation
factors
affected
mainly
by
changing
thickness
layer.
Our
results
suggest
climate
retard
rate
cycle
Overall,
our
expands
understanding
catchments
under
global
warming.
