Abstract.
Dansgaard-Oeschger
(DO)
events
are
a
pervasive
feature
of
glacial
climates.
It
is
widely
accepted
that
the
associated
changes
in
climate,
which
most
pronounced
North
Atlantic
region,
caused
by
abrupt
strength
and/or
latitude
reach
meridional
overturning
circulation
(AMOC),
possibly
originating
from
spontaneous
transitions
ocean-sea-ice-atmosphere
system.
Here
we
use
an
Earth
System
Model
produces
DO-like
to
show
climate
conditions
under
millennial-scale
AMOC
variations
occur
controlled
surface
ocean
buoyancy
flux.
In
particular,
find
present
day-like
convection
pattern
with
deep
water
formation
Labrador
and
Nordic
Seas
becomes
unstable
when
flux
integrated
over
northern
turns
negative
positive.
proximity
this
point
model
between
different
patterns
strong
weak
states.
The
depends
on
freshwater
heat
fluxes
sea
temperature
through
dependence
thermal
expansion
coefficient
seawater.
We
larger
ice
sheets
tend
stabilize
decreasing
net
while
CO2-induced
cooling
decreases
loss
destabilizes
convection.
These
results
help
explain
DO
appear,
step
towards
improved
understanding
mechanisms
changes.
Abstract.
Dansgaard-Oeschger
(DO)
events
are
a
pervasive
feature
of
glacial
climates.
It
is
widely
accepted
that
the
associated
changes
in
climate,
which
most
pronounced
North
Atlantic
region,
caused
by
abrupt
strength
and/or
latitude
reach
meridional
overturning
circulation
(AMOC),
possibly
originating
from
spontaneous
transitions
ocean-sea-ice-atmosphere
system.
Here
we
use
an
Earth
System
Model
produces
DO-like
to
show
climate
conditions
under
millennial-scale
AMOC
variations
occur
controlled
surface
ocean
buoyancy
flux.
In
particular,
find
present
day-like
convection
pattern
with
deep
water
formation
Labrador
and
Nordic
Seas
becomes
unstable
when
flux
integrated
over
northern
turns
negative
positive.
proximity
this
point
model
between
different
patterns
strong
weak
states.
The
depends
on
freshwater
heat
fluxes
sea
temperature
through
dependence
thermal
expansion
coefficient
seawater.
We
larger
ice
sheets
tend
stabilize
decreasing
net
while
CO2-induced
cooling
decreases
loss
destabilizes
convection.
These
results
help
explain
DO
appear,
step
towards
improved
understanding
mechanisms
changes.
Geophysical Research Letters,
Journal Year:
2024,
Volume and Issue:
51(20)
Published: Oct. 28, 2024
Abstract
Climate
variability
on
centennial
timescales
has
often
been
linked
to
internal
of
the
Atlantic
Meridional
Overturning
Circulation
(AMOC).
However,
due
scarceness
suitable
paleoclimate
proxies
and
long
climate
model
simulations,
large
uncertainties
remain
magnitude
physical
mechanisms
driving
centennial‐scale
AMOC
variability.
For
these
reasons,
we
perform
a
systematic
multi‐model
comparison
in
pre‐industrial
control
simulations
state‐of‐the‐art
global
models.
Six
out
nine
models
this
study
exhibit
statistically
significant
mode
Our
results
show
that
freshwater
exchanges
between
Arctic
Ocean
North
provide
plausible
mechanism
subset
models,
can
be
amplified
by
ocean–sea
ice
feedbacks
Labrador
Sea.
The
amplifying
is
sea
cover
biases,
which
could
an
observational
constraint
for
Abstract.
Dansgaard-Oeschger
(DO)
events
are
a
pervasive
feature
of
glacial
climates.
It
is
widely
accepted
that
the
associated
changes
in
climate,
which
most
pronounced
North
Atlantic
region,
caused
by
abrupt
strength
and/or
latitude
reach
meridional
overturning
circulation
(AMOC),
possibly
originating
from
spontaneous
transitions
ocean-sea-ice-atmosphere
system.
Here
we
use
an
Earth
System
Model
produces
DO-like
to
show
climate
conditions
under
millennial-scale
AMOC
variations
occur
controlled
surface
ocean
buoyancy
flux.
In
particular,
find
present
day-like
convection
pattern
with
deep
water
formation
Labrador
and
Nordic
Seas
becomes
unstable
when
flux
integrated
over
northern
turns
negative
positive.
proximity
this
point
model
between
different
patterns
strong
weak
states.
The
depends
on
freshwater
heat
fluxes
sea
temperature
through
dependence
thermal
expansion
coefficient
seawater.
We
larger
ice
sheets
tend
stabilize
decreasing
net
while
CO2-induced
cooling
decreases
loss
destabilizes
convection.
These
results
help
explain
DO
appear,
step
towards
improved
understanding
mechanisms
changes.
Abstract.
Dansgaard-Oeschger
(DO)
events
are
a
pervasive
feature
of
glacial
climates.
It
is
widely
accepted
that
the
associated
changes
in
climate,
which
most
pronounced
North
Atlantic
region,
caused
by
abrupt
strength
and/or
latitude
reach
meridional
overturning
circulation
(AMOC),
possibly
originating
from
spontaneous
transitions
ocean-sea-ice-atmosphere
system.
Here
we
use
an
Earth
System
Model
produces
DO-like
to
show
climate
conditions
under
millennial-scale
AMOC
variations
occur
controlled
surface
ocean
buoyancy
flux.
In
particular,
find
present
day-like
convection
pattern
with
deep
water
formation
Labrador
and
Nordic
Seas
becomes
unstable
when
flux
integrated
over
northern
turns
negative
positive.
proximity
this
point
model
between
different
patterns
strong
weak
states.
The
depends
on
freshwater
heat
fluxes
sea
temperature
through
dependence
thermal
expansion
coefficient
seawater.
We
larger
ice
sheets
tend
stabilize
decreasing
net
while
CO2-induced
cooling
decreases
loss
destabilizes
convection.
These
results
help
explain
DO
appear,
step
towards
improved
understanding
mechanisms
changes.
Abstract.
Dansgaard-Oeschger
(DO)
events
are
a
pervasive
feature
of
glacial
climates.
It
is
widely
accepted
that
the
associated
changes
in
climate,
which
most
pronounced
North
Atlantic
region,
caused
by
abrupt
strength
and/or
latitude
reach
meridional
overturning
circulation
(AMOC),
possibly
originating
from
spontaneous
transitions
ocean-sea-ice-atmosphere
system.
Here
we
use
an
Earth
System
Model
produces
DO-like
to
show
climate
conditions
under
millennial-scale
AMOC
variations
occur
controlled
surface
ocean
buoyancy
flux.
In
particular,
find
present
day-like
convection
pattern
with
deep
water
formation
Labrador
and
Nordic
Seas
becomes
unstable
when
flux
integrated
over
northern
turns
negative
positive.
proximity
this
point
model
between
different
patterns
strong
weak
states.
The
depends
on
freshwater
heat
fluxes
sea
temperature
through
dependence
thermal
expansion
coefficient
seawater.
We
larger
ice
sheets
tend
stabilize
decreasing
net
while
CO2-induced
cooling
decreases
loss
destabilizes
convection.
These
results
help
explain
DO
appear,
step
towards
improved
understanding
mechanisms
changes.
Abstract.
Dansgaard-Oeschger
(DO)
events
are
a
pervasive
feature
of
glacial
climates.
It
is
widely
accepted
that
the
associated
changes
in
climate,
which
most
pronounced
North
Atlantic
region,
caused
by
abrupt
strength
and/or
latitude
reach
meridional
overturning
circulation
(AMOC),
possibly
originating
from
spontaneous
transitions
ocean-sea-ice-atmosphere
system.
Here
we
use
an
Earth
System
Model
produces
DO-like
to
show
climate
conditions
under
millennial-scale
AMOC
variations
occur
controlled
surface
ocean
buoyancy
flux.
In
particular,
find
present
day-like
convection
pattern
with
deep
water
formation
Labrador
and
Nordic
Seas
becomes
unstable
when
flux
integrated
over
northern
turns
negative
positive.
proximity
this
point
model
between
different
patterns
strong
weak
states.
The
depends
on
freshwater
heat
fluxes
sea
temperature
through
dependence
thermal
expansion
coefficient
seawater.
We
larger
ice
sheets
tend
stabilize
decreasing
net
while
CO2-induced
cooling
decreases
loss
destabilizes
convection.
These
results
help
explain
DO
appear,
step
towards
improved
understanding
mechanisms
changes.
Climate of the past,
Journal Year:
2024,
Volume and Issue:
20(12), P. 2719 - 2739
Published: Dec. 16, 2024
Abstract.
Dansgaard–Oeschger
(DO)
events
are
a
pervasive
feature
of
glacial
climates.
It
is
widely
accepted
that
the
associated
changes
in
climate,
which
most
pronounced
North
Atlantic
region,
caused
by
abrupt
strength
and/or
northward
extent
meridional
overturning
circulation
(AMOC),
possibly
originating
from
spontaneous
transitions
ocean–sea-ice–atmosphere
system.
Here
we
use
an
Earth
system
model
produces
DO-like
to
show
climate
conditions
under
millennial-scale
AMOC
variations
occur
controlled
surface
ocean
buoyancy
flux.
In
particular,
find
present-day-like
convection
pattern
with
deep-water
formation
Labrador
and
Nordic
seas
becomes
unstable
when
flux
integrated
over
northern
turns
negative
positive.
proximity
this
point
between
different
patterns
strong
weak
states.
The
depends
on
freshwater
heat
fluxes
sea
temperature
through
dependence
thermal
expansion
coefficient
seawater.
We
larger
ice
sheets
tend
stabilize
decreasing
net
flux,
while
CO2-induced
cooling
decreases
loss
destabilizes
convection.
These
results
help
explain
DO
appear
step
towards
improved
understanding
mechanisms
changes.