Unveiling the role of South Tropical Atlantic in winter Atlantic Niño inducing La Niña
Nature Communications,
Год журнала:
2025,
Номер
16(1)
Опубликована: Фев. 13, 2025
The
boreal
winter-peaked
Atlantic
Niño/Niña
can
influence
La
Niña/El
Niño
(the
cold/warm
phase
of
El
Niño-Southern
Oscillation,
ENSO)
in
the
following
year.
However,
Niño-La
Niña
relationship
is
more
uncertain
than
Niña-El
counterpart.
Here,
we
show
that
this
uncertainty
arises
from
two
distinct
types
events:
Equatorial
and
Expanded
types,
which
differ
their
meridional
sea
surface
temperature
(SST)
warming.
type,
with
SST
warming
confined
to
equator,
has
a
weaker
climate
impact
due
limited
on
local
convective
heating
spring
when
intertropical
convergence
zone
(ITCZ)
shifts
southward.
In
contrast,
extending
into
southern
tropical
(STA),
drive
persistent
anomalous
convection
strong
remote
atmospheric
responses
Pacific
winter
spring.
Our
results
emphasize
critical
role
STA
conditions
shaping
Pacific.
This
paper
identifies
an
extended
type
Niño,
anomalies
South
Tropical
Atlantic,
stronger
triggering
through
responses.
Язык: Английский
Weakening AMOC reduces ocean carbon uptake and increases the social cost of carbon
Proceedings of the National Academy of Sciences,
Год журнала:
2025,
Номер
122(9)
Опубликована: Фев. 24, 2025
A
weakening
of
the
Atlantic
Meridional
Overturning
Circulation
(AMOC)
has
been
found
to
be
globally
beneficial
by
economic
assessments.
This
result
emerges
because
AMOC
would
cool
Northern
Hemisphere,
thereby
reducing
expected
climate
damages
and
decreasing
estimates
global
social
cost
carbon
dioxide
(SCC).
There
are,
however,
many
other
impacts
that
are
not
yet
taken
into
account.
Here,
we
add
a
second
impact
channel
quantifying
effects
on
ocean
uptake,
using
biogeochemically-only
coupled
freshwater
hosing
simulations
in
Max
Planck
Institute
Earth
System
Model.
Our
reveal
an
approximately
linear
relationship
between
strength
uptake
reductions,
constituting
cycle
feedback
leads
higher
atmospheric
CO
2
concentrations
stronger
warming.
feedback,
when
incorporated
integrated
climate-economy
model,
additional
several
trillion
US
dollars
raises
SCC
about
1%.
The
increase
is
similar
magnitude,
but
opposite
sign,
effect
Hemisphere
cooling.
While
there
potentially
relevant
channels,
alone
could
thus
flip
consequences
net
society.
Язык: Английский
Climate‐Dependency of Impact of Increased Carbon Dioxide on African Monsoon Rainfall: Insights From Model Simulations
Geophysical Research Letters,
Год журнала:
2025,
Номер
52(9)
Опубликована: Май 5, 2025
Abstract
Previous
studies
on
future
scenarios
identified
two
key
effects
of
increasing
the
African
summer
monsoon
(ASM):
Rising
leads
to
an
enhancement
in
moisture
supply,
favoring
increase
ASM
precipitation
(the
thermodynamic
effect).
However,
it
also
results
a
weakening
mean
atmospheric
flow,
thus
facilitating
dryness
across
region
dynamic
Therefore,
ultimate
change
stems
from
balance
both
and
effects.
This
study
further
examines
impact
rising
rainfall,
by
taking
into
account
various
climate
states.
Our
suggest
that
during
warm
interglacial
periods
has
stronger
influence
factors
than
factors,
resulting
rainfall.
In
contrast,
if
increases
under
cold
glacial
backgrounds,
its
dominates
reduction
rainfall
most
region.
Язык: Английский
Lessons from paleoclimates for recent and future climate change: opportunities and insights
Frontiers in Climate,
Год журнала:
2024,
Номер
6
Опубликована: Дек. 11, 2024
Paleoclimate
information
has
played
an
instrumental
role
in
showing
how
fast
climate
can
vary
and
large
these
changes
be.
It
provided
the
first
vivid
demonstration
of
relationships
between
atmospheric
greenhouse
gas
concentrations
surface
air
temperatures,
as
well
striking
representations
change
impacts
possible
feedbacks
within
system,
such
those
associated
with
vegetation
or
ice
sheet
changes.
Here,
a
short
review
recent
advances
paleoclimate
studies
is
provided,
objective
what
this
on
past
climates
environments
bring
to
research
current
future
climates.
We
advocate
that
(1)
paleoclimatic
paleoenvironmental
be
leveraged
for
narratives
about
change,
particular
at
local
regional
levels,
(2)
data
essential
out-of-range
tests
models,
since
are
also
out
range
used
calibrating
(3)
data,
last
millennia,
taking
multi-centennial
multi-millennial
variability
into
account
when
describing
trends
related
anthropogenic
forcings
attributing
signals,
extreme
rare
events,
(4)
paleoclimates
provide
extremely
valuable
initializing
slow
components
models.
In
addition,
we
show
beneficial
put
context
improve
our
knowledge
key
processes.
They
both
benefit
from
contribute
models
based
study
Язык: Английский