Comparative analysis of peak-summer heatwaves in the Yangtze–Huaihe River Basin of China in 2022 and 2013: Thermal effects of the Tibetan Plateau
Atmospheric Research,
Год журнала:
2024,
Номер
300, С. 107222 - 107222
Опубликована: Янв. 3, 2024
In
the
peak-summer
of
2022,
Yangtze–Huaihe
River
Basin
(YHRB)
in
China
experienced
its
most
extreme
heatwaves
since
1961.
Notably,
a
rare
heatwave
also
occurred
YHRB
2013.
However,
Tibetan
Plateau
(TP)
exhibited
different
thermal
conditions
during
those
two
years.
Observational
analysis
indicates
that
2013
and
2022
were
closely
related
to
local
anomalous
high
pressure.
The
synergistic
effects
East
Asian
subtropical
jet
(EASJ),
South
(SAH),
western
Pacific
(WPSH),
divergence
moisture,
supported
formation
maintenance
Compared
2013,
under
control
these
intensified
circulation
systems
which
led
broader
descending
motion
stronger
prevailed
over
YHRB.
Also,
surface
air
temperature
TP
reached
highest
value
whereas
it
was
not
distinctly
Corresponding
anomaly,
an
abnormal
pressure
appeared
throughout
troposphere
northern
heating
contributed
northward
strengthening
SAH
EASJ,
enhanced
westerly
winds
north
anticyclone.
Moreover,
WPSH
extends
westward
strong
With
cooperation
there
meridional
pattern
with
ascending
North
YHRB,
accompanied
by
reduced
cloud
cover
increased
insolation
leading
further
intensification
2022.
This
study
demonstrates
significant
role
anomaly
heatwaves.
Язык: Английский
Atlantic origin of the increasing Asian westerly jet interannual variability
Nature Communications,
Год журнала:
2024,
Номер
15(1)
Опубликована: Март 9, 2024
Abstract
The
summer
Eurasian
westerly
jet
is
reported
to
become
weaker
and
wavier,
thus
promoting
the
frequent
weather
extremes.
However,
primary
driver
of
changing
stream
remains
in
debate,
mainly
due
regionality
seasonality
jet.
Here
we
report
a
sharp
increase,
by
approximately
140%,
interannual
variability
summertime
East
Asian
(EAJ)
since
end
twentieth
century.
Such
interdecadal
change
induces
considerable
changes
large-scale
circulation
pattern
across
Eurasia,
consequently
climate
extremes
including
heatwaves,
droughts,
monsoonal
rainfall
regime
shifts.
trigger
emerges
from
preceding
February
North
Atlantic
seesaw
called
Scandinavian
(contributing
81.1
±
2.9%
enhanced
EAJ
variability),
which
harnesses
“cross-seasonal-coupled
oceanic-atmospheric
bridge”
exert
delayed
impact
on
aids
relevant
predictions
five
months
advance.
projections
state-of-the-art
models
with
prescribed
anthropogenic
forcing
exhibit
no
similar
changes.
This
sheds
light
that,
at
timescale,
substantial
portion
recently
increasing
sector
arises
unforced
natural
variability.
Язык: Английский
The Enhancing Effect of the East Asian Subtropical Westerly Jet on Summer Extreme High-Temperature Events over Central-Eastern China Since the Late 1990s
Advances in Atmospheric Sciences,
Год журнала:
2025,
Номер
unknown
Опубликована: Янв. 7, 2025
Язык: Английский
Gradually Disappearing Cross‐Seasonal Teleconnection Between ENSO and Tibetan Plateau Upper‐Level Westerlies
Geophysical Research Letters,
Год журнала:
2025,
Номер
52(5)
Опубликована: Март 7, 2025
Abstract
Changes
in
the
Tibetan
Plateau
upper‐level
westerlies
(TPUW)
and
El
Niño‐Southern
Oscillation
(ENSO)
are
crucial
regulating
local
hydrological
cycles
large‐range
climate.
Here
we
report
a
gradual
disappearance
of
cross‐seasonal
ENSO‐TPUW
teleconnection
since
early‐2000s,
with
correlation
decreasing
from
0.75
to
near
zero.
Before
anomalous
western
North
Pacific
(WNP)
anticyclone
(WNPAC)
induced
by
ENSO
can
last
winter
summer
under
maintenance
Indo‐western
surface
seawater
temperature
gradient
(IWPSSTG),
prompting
WNP
subtropical
high
expand
strengthen
toward
South
Asia,
attracting
Tibet
southward,
thereby
causing
westerly
jet
move
southward
forming
teleconnection.
However,
given
prominent
tropical
warming
early‐summer
outage
IWPSSTG
WNPAC
disrupts
chain.
This
discontinuity
poses
severe
challenges
improvement
short‐term
climate
predictions
surrounding
areas.
Язык: Английский
Association between the meridional displacement of the Asian jet and Indian summer monsoon rainfall in CMIP6 models: Impact of El Niño and Pacific decadal oscillation
Quarterly Journal of the Royal Meteorological Society,
Год журнала:
2025,
Номер
unknown
Опубликована: Март 23, 2025
Abstract
The
relationship
between
meridional
displacement
of
the
Asian
jet
and
Indian
summer
monsoon
(ISM)
is
examined
in
observations
40
state‐of‐the‐art
Coupled
Model
Intercomparison
Project,
phase
6
(CMIP6)
historical
simulations.
southward
(SWDAJ)
found
to
be
linked
with
reduced
rainfall
over
central
north
India
including
trough
region
both
most
CMIP6
models.
In
general,
models
are
able
simulate
characteristics
SWDAJ
during
some
differences
zonal
asymmetry.
Detailed
analysis
elucidated
two
observed
pathways
that
connect
ISM
variability.
first
west
jet–easterly
pathway,
where
southeastward
shift
South
high,
contributing
weakening
tropical
easterly
jet.
This
pattern
aligns
changes
low‐level
circulation
contributed
India.
pathway
well
represented
by
second
involves
East
jet–Pacific
Japan
pattern,
which
Asia
strengthens
western
North
Pacific
anticyclone
through
barotropic–baroclinic
coupling.
anomalous
westward
extended
easterlies
originating
from
hinder
southwesterly
flow
suppress
rainfall.
It
largely
failed
capture
likely
due
models'
tendency
overestimate
simulation
Ocean
dipole,
extension
El
Niño‐related
sea‐surface
temperature
anomalies
Further,
combined
influence
Niño
decadal
oscillation
alone
on
also
discussed
detail.
Results
obtained
this
study
useful
understand
ability
representing
midlatitude
associated
Язык: Английский
Influence of Equatorial Spring Insolation on Abrupt Asian Summer Monsoon Decline at Orbital Scale
Journal of Geophysical Research Atmospheres,
Год журнала:
2024,
Номер
129(13)
Опубликована: Июль 4, 2024
Abstract
The
dominant
influence
of
precession‐induced
changes
in
summer
insolation
on
orbital‐scale
variability
the
Asian
monsoon
(ASM)
during
Holocene
has
been
widely
proposed;
however,
it
remains
unclear
why
decline
ASM
started
several
thousand
years
after
peak
insolation.
Through
comparisons
climate
simulations
and
proxy
records,
our
study
reveals
that
abrupt
coincided
with
an
increase
spring
at
equator.
reduced
resulted
a
cooler
tropical
Indian
Ocean,
which
weakened
shifted
northward
westerly
jet
due
to
decreased
meridional
thermal
gradient.
South
high
moved
conjunction
jet,
causing
anomalous
upwards
over
northern
Asia,
Tibetan
Plateau,
as
well
southwestern
China.
associated
cyclone
Plateau
enhanced
monsoonal
moisture
transport,
subsequently
intensifying
circulation
precipitation.
was
by
decrease
opposite.
superimposed
Consequently,
is
dominated
precession
not
only
via
but
also
spring.
Язык: Английский
The out‐of‐phase pattern of summer precipitation over northern China and the possible mechanisms
International Journal of Climatology,
Год журнала:
2024,
Номер
44(12), С. 4428 - 4442
Опубликована: Авг. 7, 2024
Abstract
This
study
explored
the
interannual
characteristics
of
out‐of‐phase
pattern
summer
precipitation
over
northern
China
during
past
years,
as
well
possible
underlying
mechanisms.
The
is
characterized
by
positive
anomaly
in
Northwest
(NWC)
and
negative
North
(NC).
Our
analyses
indicate
that
variation
Asian
westerly
jet
(AWJ)
found
evidently
associated
with
this
precipitation.
meridional
displacement
AWJ
induces
opposite
trends
water
vapour
transport
circulation
anomalies
between
NWC
NC,
leading
to
pattern.
Further
suggest
Arctic
sea
ice
concentration
(SIC),
Atlantic
Pacific
surface
temperature
(SST)
can
impact
triggering
Eurasian
(EU),
polar‐Eurasia
(POL)
Pacific‐Japan
(PJ)
teleconnection
patterns,
respectively,
which
turn
modulate
formation
primarily
affected
SST
anomalies,
whereas
NC
notably
influenced
both
SIC
anomaly.
However,
role
on
exhibits
an
evident
contrast,
Язык: Английский
Concurrent Inter‐Model Spread of Boreal Winter Westerly Jet Meridional Positions Between the Northern and Southern Hemispheres in CMIP6 Models
International Journal of Climatology,
Год журнала:
2024,
Номер
unknown
Опубликована: Окт. 23, 2024
ABSTRACT
This
study
investigates
the
inter‐model
spread
of
climatological
extratropical
westerly
jets
in
boreal
winter,
using
historical
simulation
52
Coupled
Model
Intercomparison
Project
phase
6
(CMIP6)
models
from
1851
to
2014.
The
results
show
that
there
is
a
substantial
latitude
upper‐tropospheric
jet
across
models,
characterised
by
large
standard
deviations
both
poleward
and
equatorward
sides
axis,
although
multi‐model
ensemble
mean
(MME)
performs
well
simulating
meridional
position
jets.
Furthermore,
we
detect
consistency
between
Northern
Southern
Hemispheres,
based
on
empirical
orthogonal
function
(EOF)
decomposition
correlation
regional‐averaged
zonal
winds.
Specifically,
simulate
poleward/equatorward
relative
MME
one
hemisphere
also
tend
other
hemisphere.
Accordingly,
define
global
index
depict
concurrence
shift
two
hemispheres.
regression
analyses
this
indicate
positioning
than
wider
Hadley
Cell,
poleward‐shifted
Ferrel
Cell
Hemisphere,
enhanced
precipitation
subtropics
suppressed
tropics,
warmer
sea
surface
temperatures
mid‐latitudes.
present
suggest
improving
positions
climate
requires
comprehensive
consideration
thermal
states
tropics
subtropics/mid
latitudes.
Язык: Английский
An interannual dipole mode of midsummer persistent extreme high-temperature days between South China and Southwest China: effects of Indo-Pacific sea surface temperature
Climate Dynamics,
Год журнала:
2024,
Номер
63(1)
Опубликована: Дек. 11, 2024
Язык: Английский
A teleconnection pattern of upper-tropospheric circulation anomalies over the Eurasian continent associated with the interannual variability of atmospheric convection over the tropical western North Pacific in July
Atmospheric and Oceanic Science Letters,
Год журнала:
2023,
Номер
17(3), С. 100451 - 100451
Опубликована: Дек. 26, 2023
It
has
been
well
documented
that
the
interannual
variation
of
atmospheric
convection
over
tropical
western
North
Pacific
(WNP)
affects
East
Asian
climate
in
summer
significantly,
and
can
be
influenced
by
preceding
winter
ENSO.
However,
there
is
also
a
large
portion
WNP
variability
cannot
explained
This
study
suggests
that,
particularly
July,
anomalies
are
closely
associated
with
teleconnection
pattern
upper-tropospheric
circulation
Eurasian
continent,
which
characterized
an
anomalous
cyclone
Europe,
anticyclone
Central
Asia,
zonally
elongated
Asia.
detected
first
leading
mode
July.
We
conclude,
based
on
present
results
those
previous
studies,
induces
through
Rossby
wave
breaking
near
jet
exit
region,
this
impact
comparable
to
热带西北太平洋大气对流的年际变化对东亚夏季气候有着显著影响,
而且受到前冬ENSO的影响.然而,
还有相当多的西北太平洋对流年际变化不能由前冬ENSO解释.本文表明,
7月西北太平洋对流受到欧亚大陆对流层上层遥相关型的显著影响,
且这一影响与前冬ENSO的影响程度相当.该遥相关型表现为位于欧洲的气旋式环流异常,中亚的反气旋式环流异常和东亚带状延伸的气旋式环流异常,
并表现为7月对流层上层环流的第一主模态.基于本文的结果并结合前人的研究,
我们认为这一遥相关型能通过亚洲急流出口区附近的罗斯贝波破碎引起西北太平洋对流异常.
Язык: Английский