Weather and Climate Dynamics,
Год журнала:
2022,
Номер
3(1), С. 21 - 44
Опубликована: Янв. 7, 2022
Abstract.
Atmospheric
blocking
can
influence
Arctic
weather
by
diverting
the
mean
westerly
flow
and
steering
cyclones
polewards,
bringing
warm,
moist
air
to
high
latitudes.
Recent
studies
have
shown
that
diabatic
heating
processes
in
ascending
warm
conveyor
belt
branch
of
extratropical
are
relevant
dynamics.
This
leads
question
extent
which
associated
with
mid-latitude
may
high-latitude
drive
events.
In
this
study
we
investigate
dynamics
behind
50
extreme
events
wintertime
high-Arctic
temperature
anomalies
during
1979–2016.
Classifying
based
on
occurrence
within
three
selected
sectors,
find
30
these
a
block
over
Urals,
featuring
negative
upper-level
potential
vorticity
(PV)
central
Siberia
north
Ural
Mountains.
Lagrangian
back-trajectory
calculations
show
almost
60
%
parcels
making
up
PV
experience
lifting
(median
11
K)
6
d
prior
block.
Further,
70
heated
trajectories
undergo
maximum
compact
region
North
Atlantic,
temporally
taking
place
between
1
before
arriving
region.
We
also
anomalously
cyclone
activity
(on
average
five
5
window)
sector
northwest
main
domain.
addition,
10
Scandinavia.
Around
back
started
from
blocks
heating,
Atlantic
but
generally
closer
time
arrival
further
upstream
relative
blocking.
suggests
that,
addition
ability
guide
northwards,
play
significant
role
providing
low-PV
via
moist-diabatic
processes.
emphasizes
importance
mutual
interactions
Eurasian
for
extremes.
Earth-Science Reviews,
Год журнала:
2020,
Номер
209, С. 103324 - 103324
Опубликована: Авг. 12, 2020
The
greatest
impacts
of
climate
change
on
ecosystems,
wildlife
and
humans
often
arise
from
extreme
events
rather
than
changes
in
climatic
means.
Northern
high
latitudes,
including
the
Arctic,
experience
a
variety
climate-related
events,
yet
there
has
been
little
attempt
to
synthesize
information
this
region.
This
review
surveys
work
various
types
northern
addressing
(1)
evidence
for
variations
based
analyses
recent
historical
data
(2)
projected
primarily
studies
utilizing
global
models.
survey
weather
includes
temperature,
precipitation,
snow,
freezing
rain,
atmospheric
blocking,
cyclones,
wind.
also
cryospheric
biophysical
impacts:
sea
ice
rapid
loss
Greenland
Ice
Sheet
melt,
floods,
drought,
wildfire,
coastal
erosion,
terrestrial
marine
ecosystems.
Temperature
rank
at
end
spectra
confidence
future
change,
while
flooding
cyclones
lower
end.
Research
priorities
identified
basis
include
greater
use
high-resolution
models
observing
system
enhancements
that
target
events.
There
is
need
further
attribution,
ecosystems
humans,
thresholds
or
tipping
points
may
be
triggered
by
latitudes.
Current Climate Change Reports,
Год журнала:
2018,
Номер
4(4), С. 383 - 395
Опубликована: Авг. 2, 2018
Dynamic
manifestations
of
climate
change,
i.e.
those
related
to
circulation,
are
less
well
understood
than
thermodynamic,
or
temperature-related
aspects.
However,
this
knowledge
gap
is
narrowing.
We
review
recent
progress
in
understanding
the
causes
observed
changes
polar
tropospheric
and
stratospheric
interpreting
model
projections
their
future
changes.
Trends
annular
modes
reflect
influences
multiple
drivers.
In
Northern
Hemisphere,
there
appears
be
a
"tug-of-war"
between
opposing
effects
Arctic
near-surface
warming
tropical
upper
warming,
two
predominant
features
atmospheric
response
increasing
greenhouse
gases.
Future
trends
Southern
Hemisphere
largely
depend
on
competing
ozone
recovery
Human
influence
Antarctic
circulation
detectable
strengthening
vortex
poleward
shift
westerly
winds.
Observed
cannot
confidently
separated
from
internal
variability.
Annals of the New York Academy of Sciences,
Год журнала:
2021,
Номер
1504(1), С. 167 - 186
Опубликована: Июль 27, 2021
Abstract
We
analyze
the
polar
sea
ice
distribution
and
global
level
pressure
(SLP)
baroclinicity
distributions
over
“satellite”
period
of
1979–2020.
In
Arctic,
there
are
statistically
significant
extent
(SIE)
decreases
in
all
calendar
months,
annual
mean
has
lost
2.22
million
km
2
four
decades.
The
Antarctic
SIE,
marked
contrast,
increased
up
to
2014,
then
commenced
a
remarkable
retreat
(the
decreased
by
2.03
3
years
2017),
subsequently
near
its
long‐term
average
value
2020.
shifts
seasonal‐mean
SLP
patterns
consistent
with
warming
planet.
At
synoptic
scale,
we
diagnose
changes
baroclinicity,
mechanism
which
cyclones,
fronts,
other
weather
systems
generated.
Through
novel
presentation,
give
an
overview
relative
roles
vertical
shear
static
stability
influencing
trends
baroclinicity.
both
Arctic
regions,
is
shown
have
each
season
(with
sole
exception
summer).
This
increase,
coupled
midlatitude
results
poleward
storm
tracks.
Bulletin of the American Meteorological Society,
Год журнала:
2020,
Номер
101(9), С. E1475 - E1491
Опубликована: Апрель 6, 2020
Abstract
Unprecedented
changes
in
the
climate
and
environment
have
been
observed
three
poles,
including
North
Pole,
South
Third
Pole–Tibetan
Plateau.
Although
considerable
data
collected
several
observation
networks
built
these
polar
regions,
poles
are
relatively
data-scarce
regions
due
to
inaccessible
acquisition,
high-cost
labor,
difficult
living
environments.
To
address
obstacles
better
understanding
unprecedented
their
effects
on
global
humans,
there
is
a
pressing
need
for
curation,
integration,
service,
application
support
fundamental
scientific
research
sustainable
development
poles.
CASEarth
Poles,
project
within
framework
of
“CAS
Big
Earth
Data
Science
Engineering”
program
Chinese
Academy
Sciences,
aims
construct
big
platform
Poles
will
be
devoted
1)
breaking
bottleneck
sharing;
2)
developing
high-resolution
remote
sensing
products
over
poles;
3)
generating
atmospheric
reanalysis
datasets
regions;
4)
exploring
synchronization,
asynchronization,
teleconnection
environmental
5)
investigating
climate,
water
cycle,
ecosystem
dynamics
interactions
among
multispheres
effects;
6)
supporting
decision-making
with
regard
sea
ice
forecasting,
infrastructure,
regions.
collaborate
international
efforts
enable
information
services
era.
This
study
reports
the
occurrence
of
intense
atmospheric
rivers
(ARs)
during
two
large
Weddell
Polynya
events
in
November
1973
and
September
2017
investigates
their
role
opening
via
enhancement
sea
ice
melt.
Few
days
before
polynya
openings,
persistent
ARs
maintained
a
sustained
positive
total
energy
flux
at
surface,
resulting
thinning
decline
concentration
Maud
Rise
region.
The
were
associated
with
anomalously
high
amounts
precipitable
water
cloud
liquid
content
exceeding
3
SDs
above
climatological
mean.
above-normal
integrated
vapor
transport
(IVT
99th
percentile),
as
well
opaque
bands,
warmed
surface
(+10°C
skin
air
temperature)
substantial
increases
(+250
W
m
Journal of Climate,
Год журнала:
2021,
Номер
34(10), С. 3733 - 3749
Опубликована: Фев. 11, 2021
Abstract
For
the
last
few
decades
Northern
Hemisphere
midlatitudes
have
seen
an
increasing
number
of
temperature
extreme
events.
It
has
been
suggested
that
some
these
extremes
are
related
to
planetary
wave
activity.
In
this
study
we
identify
propagation
regions
at
300
hPa
using
ERA-Interim
dataset
from
1980
2017
and
link
them
in
densely
populated
Hemisphere.
Most
studies
used
background
flow
fields
monthly
or
seasonal
scale
investigate
propagation.
a
phenomenon
is
influenced
by
threshold
incidents
nonlinear
processes,
can
distort
net
Rossby
signal.
A
novel
aspect
our
investigation
lies
use
daily
data
allowing
it
be
diagnosed
for
limited
but
important
periods
across
wider
range
latitudes,
including
polar
region.
We
show
winter
associated
with
circulation
anomalies
both
Arctic
tropics,
while
relative
importance
areas
differs
according
specific
midlatitude
particular,
trains
connecting
tropical
Pacific
Atlantic
may
North
America
Siberia.
seas
markedly
Eurasian
regions.
Analysis
synoptic
suggests
pre-existing
local
play
key
role
development
those
extremes,
as
well
amplification
large-scale
trains.
also
demonstrate
warm
create
cold
outbreaks
Siberia
America.
Quarterly Journal of the Royal Meteorological Society,
Год журнала:
2020,
Номер
146(730), С. 2138 - 2153
Опубликована: Март 13, 2020
Abstract
We
use
reanalysis
data
to
substantiate
the
role
of
Ural
blocking
(UB)
in
driving
Warm
Arctic–Cold
Siberia
(WACS)
pattern,
which
represents
an
anti‐correlation
surface
temperature
between
Barents–Kara
Seas
and
central
Asia.
confirm
a
robust
link
UB
WACS
pattern
on
daily
subseasonal
time‐scales.
controls
pace
pattern;
warming
over
cooling
Asia
peak
3–5
days
after
onset.
The
observed
sea
ice
deficit
weeks
prior
onset
is
not
statistically
significant
when
long‐term
trend
removed.
Thus,
may
have
direct
impact
occurrence
but
it
develops
as
delayed
response
UB.
interannual
variability
also
strongly
linked
identify
upward
wintertime
recent
decades
that
accounts
for
rate
1°C/decade
Over
Seas,
trends
explain
small
fraction
warming,
dominated
by
Arctic
amplification.
Finally,
ERA‐Interim
period
weaker
during
1990s
lowest
activity
was
observed.
