Water,
Год журнала:
2023,
Номер
15(19), С. 3459 - 3459
Опубликована: Сен. 30, 2023
Thoroughly
investigating
the
evolution
of
groundwater
circulation
and
its
controlling
mechanism
in
Aksu
River
Basin,
where
human
activities
are
intensifying
environment
is
increasingly
deteriorating,
highly
urgent
important
for
promoting
theory,
development
implementation
flow
systems
(GFSs)
protecting
resources.
Based
on
a
detailed
analysis
sediment
grain
size
distribution,
chronology,
electrofacies,
glacial
sedimentary
sequence,
palaeoclimate
indicators
existing
age,
this
paper
systematically
reconstructs
palaeosedimentary
basin-scale
aquifer
system
study
area
scientifically
reveals
evolutionary
pattern
formation
GFS.
The
results
showed
that
later
period
late
Pleistocene
experienced
rapid
downcutting
erosional
event
caused
by
tectonic
uplift,
transitioned
from
dry–cold
deep
Last
Glacial
Maximum
(LGM)
to
coarse-grained
fast-filling
fluvial
facies
Deglaciation
(LDP)
as
temperature
rose;
then,
it
shifted
an
fine-grained
stable
alternating
accumulation
lacustrine
was
dominated
warm
arid
conditions
Holocene
megathermal
(HMP);
process
changed
previous
river
base
level
via
erosion,
glacier
elongation
or
shortening
level,
thus
resulting
complex
coupling
relationship
between
environment,
basin
Furthermore,
GFS
exhibits
vertically
unconformable
age
which
indicates
outcome
superposition
controlled
different
periods.
Therefore,
neotectonic
movement
climate
fluctuation
have
jointly
acted
variation
“seesaw”
effect,
thereby
fundamentally
strength
driving
force
gradual
fully
developed
regional
during
LGM
current
multihierarchy
nested
pattern.
Nature Communications,
Год журнала:
2024,
Номер
15(1)
Опубликована: Авг. 2, 2024
Abstract
The
“4.2
ka
event”
is
a
commonly
described
abrupt
climate
excursion
that
occurred
about
4200
years
ago.
However,
the
extent
to
which
this
event
coherent
across
regional
and
larger
scales
unclear.
To
objectively
assess
excursions
in
Holocene
we
compile
1142
paleoclimate
datasets
span
all
continents
oceans
include
wide
variety
of
archive
proxy
types.
We
analyze
these
data
determine
timing,
significance
spatial
imprint
using
an
objective
method
quantifies
local,
global
significance.
Site-level
temperature
hydroclimate
are
common
throughout
Holocene,
but
significant
global-scale
rare.
most
prominent
8200
ago,
when
cold
dry
conditions
formed
large,
centered
North
Atlantic.
find
additional
between
1600
1000
agree
with
tree-ring
annual-scale
reconstructions,
adding
confidence
context
our
findings.
In
contrast,
although
some
show
they
do
not
occur
regions.
Consequently,
like
other
periods
globally
excursion.
Scientific Reports,
Год журнала:
2025,
Номер
15(1)
Опубликована: Март 1, 2025
Abstract
Understanding
the
sources
and
dynamics
of
past
biomass
burning
remain
a
significant
challenge
due
to
variations
in
paleofire
combustion
patterns
across
different
temporal
spatial
scales.
This
study
integrates
black
carbon
polycyclic
aromatic
hydrocarbon
(PAH)
records
from
Lubei
Plain
Shandong
Peninsula,
Lower
Yellow
River,
reconstruct
Holocene
fire
regimes
their
relationship
with
climatic
shifts
human
activities
over
5000
years.
During
mid-to-late
(5000–3000
year
BP.
(calendar
years
before
1950)),
levels
were
generally
low,
pronounced
peak
low-molecular-weight
PAHs
(3-ring
PAHs)
charcoal
fluxes
between
4500
BP,
indicating
increased
activity
likely
driven
by
short-term
cold-dry
event
around
From
3500
1000
three
distinct
episodes
low-temperature
smoldering
fires
are
identified,
coinciding
deforestation
persistent
droughts
during
Shang
Dynasty
(3600–3046
BP),
Qin
Western
Han
Dynasties
(2200–2000
Sui
Tang
(1400–1100
BP).
In
contrast,
high-temperature
flaming
associated
periods
intensified
warfare
social
upheaval,
compounded
cold,
arid
climates
Warring
States
period
(2500–2400
Eastern
(2000–1800
Wei,
Jin,
Southern-Northern
(1800–1400
Over
millennium,
anthropogenic
remained
elevated,
reflecting
sustained
influence
on
regimes.
Meanwhile,
Pollen
n-alkane
reveal
transition
primary
forests
secondary
shrubland
late
Holocene,
declining
seasonal
precipitation
linked
weakening
East
Asian
monsoon
burning.
Principal
component
analysis
indicates
that
long-term
primarily
drove
fires,
whereas
more
closely
conflict.
Seasonal
variability,
regulated
monsoonal
dynamics,
emerged
as
fundamental
control
integrated
PAHs,
carbon,
charcoal,
coupled
multivariate
statistical
approaches,
offers
robust
framework
for
reconstructing
fire-climate-human
interactions
Asia.
The
findings
provide
new
insights
into
mechanisms
driving
ecological
societal
impacts.
Scientific Reports,
Год журнала:
2025,
Номер
15(1)
Опубликована: Март 8, 2025
The
frequent
droughts
and
floods,
closely
associated
with
the
Asian
summer
monsoon
(ASM),
has
profoundly
affected
ecological
environment
economy
in
East
Asia.
While
changes
ASM
are
related
to
precipitation
patterns,
specific
mechanism
still
requires
further
investigation.
This
study
utilized
stalagmite
records
from
Feilong
Cave
southwest
China
reconstruct
evolution
of
since
Medieval
Warm
Period
(MWP).
results
indicated
that
strengthened
during
MWP
weakened
Little
Ice
Age
(LIA),
intensity
primarily
driven
by
solar
activity
variations
tropical
ocean-atmosphere
circulation.
Different
phase
combinations
Atlantic
Multidecadal
Oscillation,
Pacific
Decadal
Oscillation
also
influenced
on
ASM.
During
MWP,
warming
northern
hemisphere
landmasses,
intensified,
enhancing
long-range
transport
moisture
(Indian
monsoon),
leading
northward
shifts
rain
belt
eastern
region
increased
China.
Conversely,
LIA,
cooling
landmasses
led
a
weakening
reduced
transport,
resulting
southward
southern
Additionally,
abnormal
shift
Western
Subtropical
High
prolonged
retention
China,
causing
an
increase
monsoonal
rainfall
Comparison
Chinese
terrestrial
proxy
reveals
antiphase
relationship
between
parts
counterparts
showed
"wet
north-dry
south"
pattern,
while
south-dry
north"
pattern
emerged.
Furthermore,
suggest
human
activities
exacerbated
deterioration
karst
Middle
Ages.
The Holocene,
Год журнала:
2024,
Номер
34(7), С. 908 - 920
Опубликована: Март 27, 2024
Alluvial-lacustrine
deposits
are
important
carriers
for
studying
paleo-hydrological
information
and
the
evolution
of
paleo-environments.
In
this
study,
a
total
6
optically
stimulated
luminescence
(OSL)
samples
from
2
profiles
in
lower
middle
reaches
Hutubi
River
North
Tianshan
Mountains
were
dated,
comprehensive
analysis
was
conducted
by
integrating
sedimentary
structures,
grain
sizes,
magnetic
susceptibility
characteristics
to
explore
environment
patterns
regional
processes
during
Mid
late
Holocene.
The
results
revealed
following
findings:
(1)
OSL
signal
quartz
indicates
predominance
fast
components,
allowing
reliable
dating
fluvial
sediments
using
appropriate
condition-tested
coarse-grained
single-aliquot
regenerative
dose
(SAR)
protocol
within
90–125
μm
range.
(2)
Analysis
reveals
lithofacies
heterotopic
synchronous
or
homotopic
asynchronous
exposed
profiles,
with
predominantly
poorly
sorted
fine
very
sand.
Magnetic
is
primarily
controlled
content
minerals
coarse
particles,
while
also
being
influenced
combined
effects
provenance
input
depositional
environment,
indicating
complex
variable
hydrodynamic
conditions
driven
processes.
(3)
Based
on
various
environmental
proxy
indicators,
it
determined
that
climatic
Middle
Late-Holocene
downstream
areas
northern
piedmonts
demonstrates
fluctuating
pattern
wet
dry
alternations.
shifted
stable
state
Mid-Holocene
an
unstable
Late-Holocene.
intermittent
appearance
records
may
be
associated
increased
river
activity
caused
presumably
release
high-altitude
ice
due
rising
temperatures
warming
conditions.
