Journal of Glaciology,
Год журнала:
2024,
Номер
unknown, С. 1 - 13
Опубликована: Окт. 14, 2024
Abstract
Ice
shelves
regulate
the
flow
of
Antarctic
ice
sheet
toward
ocean
and
its
contribution
to
sea-level
rise.
Accurately
monitoring
basal
surface
melting
is
therefore
essential
for
predicting
sheet's
response
climatic
warming.
In
this
study,
we
utilize
Sentinel-1A
synthetic
aperture
radar
satellite
imagery
combined
with
shipboard
measurements
water
temperature
salinity
investigate
presence
surficial
meltwater
plumes
along
coastline.
Our
approach
reveals
a
strong
correlation
between
areas
pronounced
low
backscatter
extending
from
significant
decreases
in
salinity,
suggesting
meltwater-enriched
waters.
We
propose
that
signature
outflows
caused
by
stable
stratification
upper
column,
driven
density
contrasts
buoyant,
low-salinity
current
shear
reduce
Bragg
scattering
waves.
The
resulting
smooth
surfaces
were
observed
adjacent
expression
deep
channels,
documented
helicopter
survey
part
Bellingshausen
Sea
edge.
present
high-temporal
resolution
as
tool
identifying
release
beneath
shelves,
capable
all-weather,
day-and-night
imaging.
Journal of Geophysical Research Oceans,
Год журнала:
2025,
Номер
130(2)
Опубликована: Фев. 1, 2025
Abstract
Antarctic
sea
ice
has
been
characterized
by
high
temporal
and
spatial
variability
since
the
inception
of
reliable
satellite
records.
The
complex
oceanic
atmospheric
mechanisms
driving
this
present
ongoing
challenges
in
determining
their
respective
contributions.
We
examine
cyclonic
anticyclonic
rotation
dynamics
within
overlying
atmosphere
at
daily
timescales
from
1991
to
2020
using
a
new
generation
remote‐sensing
product
for
sea‐ice
drift.
A
two‐dimensional
pattern
similarity
comparison
between
vorticity
fields
demonstrated
noteworthy
increase
over
past
3
decades,
despite
absence
any
discernible
trends
mean
intensity
either
field.
This
escalating
coupling
suggests
an
increasing
responsiveness
forcing,
phenomenon
observed
across
all
regions
Southern
Ocean.
Notably,
Weddell
Sea
experienced
sharp
decline
its
clockwise
anticlockwise
components
2002
onwards.
increased
drift
synoptic
scale
with
no
forcing
points
plausible
role
ocean
modifying
rheology
pack‐ice.
Analysis
southern
annular
mode
(SAM)
reveals
winter
correlation
but
not
strengthening
trend
SAM
is
negligible.
Our
findings
reiterate
predominant
ice,
while
highlighting
knowledge
gap
on
possibly
influence
under‐ice
dynamics.
Journal of Plant and Animal Ecology,
Год журнала:
2025,
Номер
2(1), С. 51 - 61
Опубликована: Март 31, 2025
Antarctic
krill
is
an
important
component
of
the
zooplankton
production
in
Southern
Ocean
and
a
major
food
source
for
baleen
whales.
The
role
commercial
fishing
predation
by
whales
on
Krill
abundance
has
been
investigated
here
using
innovative
ecosystem-based
fishery
management,
EBFM
which
maintains
to
whale
web
ecosystem
stability.
literature
indicates
may
have
overfished,
so
it
was
reduced
current
annual
upper
limit
0.62
million
tonnes
support
other
predators
krill,
such
as
seals,
penguins
flying
sea
birds.
However,
recent
suggests
moderate
reduction
catch
Peninsula
area
due
its
importance
migration
temperate
areas.
estimated
be
about
10%
additional
concerns
climate
change
effects
Ocean,
reducing
overall
0.556
tonnes,
moderately
higher
than
maximum
taken
2022.
Hence,
biomass
allow
predators,
giving
full
mortality
similar
that
previously
maintain
Ocean.
npj Climate and Atmospheric Science,
Год журнала:
2025,
Номер
8(1)
Опубликована: Апрель 7, 2025
Abstract
Climate
records
have
been
broken
with
alarming
regularity
in
recent
years,
but
the
events
of
2023–2024
were
exceptional
even
when
accounting
for
climatic
trends.
Here
we
quantify
these
across
multiple
variables
and
show
how
excess
energy
accumulation
Earth
system
drove
conditions.
Key
factors
positive
decadal
trend
Earth’s
Energy
Imbalance
(EEI),
persistent
La
Niña
conditions
beginning
2020,
switch
to
El
Niño
2023.
Between
2022
2023,
heating
from
EEI
was
over
75%
larger
than
during
onset
similar
events.
We
further
regional
processes
shaped
distinct
patterns
record-breaking
sea
surface
temperatures
individual
ocean
basins.
If
is
maintained,
argue
that
natural
fluctuations
such
as
ENSO
cycles
will
increasingly
lead
amplified,
impacts,
serving
a
glimpse
future
climate
extremes.
Nature Communications,
Год журнала:
2025,
Номер
16(1)
Опубликована: Апрель 9, 2025
Total
sea
ice
extent
(SIE)
across
the
Southern
Ocean
increased
from
1979-2014,
but
declined
rapidly
after
2016.
Significant
decline
has
emerged
since
peak
of
SIE
in
2014,
coincident
with
Pacific
sub-decadal
surface
temperature
(SST)
trends
resembling
a
strong
La
Niña-like
cold
condition
and
negative
phase
interdecadal
oscillation
(IPO).
Previous
studies
suggest
that
warm
subsurface
was
an
important
driver
low
spring
2016
sustained
state
since.
Here
we
show
observed
atmospheric
circulation
changes
near
Antarctica
during
period
June
2013-May
2023
are
conducive
to
increasing
via
advection
north
reducing
Antarctic
SIE,
involving
deepening
Amundsen
Sea
Low
anomalous
high
pressures
over
Weddell
West
sectors.
Through
coupled
pacemaker
experiments,
demonstrate
SST
have
dominantly
driven
these
through
tropical-polar
teleconnections
also
induced
significant
warming
recent
decade.
The
consequent
decreasing
enhanced
effect
significantly
contributed
rapid
decline.
Global Biogeochemical Cycles,
Год журнала:
2025,
Номер
39(4)
Опубликована: Апрель 1, 2025
Abstract
The
Southern
Ocean
(south
of
30°S)
contributes
significantly
to
global
ocean
carbon
uptake
through
the
solubility,
physical
and
biological
pumps.
Many
studies
have
estimated
export
deep
ocean,
but
very
few
attempted
a
basin‐scale
perspective,
or
accounted
for
sea‐ice
zone
(SIZ).
In
this
study,
we
use
an
extensive
array
BGC‐Argo
floats
improve
previous
estimates
across
basins
frontal
zones,
specifically
including
SIZ.
Using
new
method
involving
changes
in
particulate
organic
dissolved
oxygen
along
mesopelagic
layer,
find
that
total
from
2014
2022
is
2.69
±
1.23
PgC
y
−1
.
polar
Antarctic
most
(41%)
with
1.09
0.46
Conversely,
SIZ
least
(8%)
0.21
0.09
displays
strong
shallow
respiration
upper
200
m.
However,
contribution
can
increase
up
14%
depending
on
depth
range
investigated.
We
also
consider
vertical
turbulent
fluxes,
which
be
neglected
at
are
important
near
surface.
Our
work
provides
complementary
approach
relevant
focuses
evaluating
biogeochemical
impacts
extent.
Refining
understanding
its
drivers
ultimately
our
comprehension
climate
variability
scale.
Scientific Reports,
Год журнала:
2025,
Номер
15(1)
Опубликована: Май 8, 2025
Abstract
In
2023,
global
ocean
heat
content
reached
unprecedented
values
since
records
began
in
1960.
The
translation
of
into
regional
and
local-scale
warming
remains
poorly
understood
because
limited
observational
data,
particularly
within
Southeast
Asia.
Here,
we
investigate
the
2023
event
Asia
using
near-continuous
41-month
in-situ
temperature
observations
from
Singapore
Strait,
satellite
sea
surface
(SST)
measurements,
high-resolution
reanalysis
products.
We
document
anomalous
across
Strait
surrounding
South
China
Sea
Indonesian
Seas
to
depths
at
least
40
m.
Peak
SSTs
1.8
°C
above
climatological
mean
were
recorded
central
Sunda
Shelf
November
for
first
time
>
years.
Concurrent
freshening
was
observed,
with
average
salinity
below
October
December.
identify
a
southward
migration
warm
anomalies
beginning
onset
El
Niño
July
near
Luzon
Strait.
This
occurred
alongside
shifts
sea-level
pressure
near-surface
currents
region.
attribute
these
shift
North
Equatorial
Current
bifurcation
latitude,
which
permitted
intrusion
Pacific
western
boundary
seas.
Compared
oceanic
drivers,
atmospheric
forcings
played
role
driving
2023.
Our
study
highlights
as
key
driver
emphasises
need
expanded
continuous,
monitoring
enhance
understanding
evolving
ocean-atmosphere
dynamics
impacts
under
climate.
Journal of Geophysical Research Oceans,
Год журнала:
2024,
Номер
129(10)
Опубликована: Окт. 1, 2024
Abstract
Atmospheric
circulation
has
significant
impacts
on
sea
ice
drifting
patterns
and
mass
balance,
as
wind
drag
induces
pressure
ridges
leads
the
surface.
In
this
study,
spatiotemporal
distributions
of
these
dynamic
deformation
features
in
Ross
Sea
are
examined
using
ICESat‐2
(IS2)
ATL10
freeboard
data
(2019–2022).
The
temporal
variation
modal
thickness
(SIT),
caused
by
thermodynamic
growth
advection,
varies
from
0.7–1.0
m
April
to
1.0–1.6
July–September
decreases
thereafter
northwest
(NW)
northeast
(NE)
sectors.
This
SIT
agrees
with
air
temperature
(correlation
coefficients
>0.5).
southwest
(SW)
sector
shows
a
consistently
low
(<1.0
m)
because
production
new
polynyas
continuous
northward
drift.
Meanwhile,
southeast
(SE)
thickest
Octobers
2019
2020
advection
thick
Amundsen
Sea,
which
was
reduced
2021
2022.
terms
deformation,
SE
largest
wind‐driven
convergence
movement.
However,
such
intense
diminished
2022
due
dominance
strong
southerly
associated
Low
(ASL).
study
emphasizes
potential
IS2
products
assess
role
atmospheric
driving
forces
changes.