Abstract.
The
Arctic
Ocean
is
a
region
important
for
global
and
regional
climate.
Although
generally
quiescent
compared
to
mid-latitudes,
the
upper
ocean
hosts
mesoscale
smaller
scale
processes.
These
processes
can
have
profound
impact
on
vertical
fluxes,
stratification,
feedback
with
sea
ice
atmosphere.
Sparse
non-synoptic
in-situ
observations
of
polar
oceans
are
limited
by
distribution
manual
observing
platforms
autonomous
instrumentation.
Analyzing
observational
data
assess
tracer
field
gradients
dynamics
becomes
highly
challenging
when
measurement
drift
pack
due
continuous
changes
in
speed
direction.
This
work
presents
dynamical
reconstruction
state,
based
Multidisciplinary
Observatory
Study
Climate
(MOSAiC)
experiment.
Overall,
model
reproduce
lateral
structure
temperature,
salinity,
density
fields,
which
allows
projecting
dynamically
consistent
features
these
fields
onto
regular
grid.
We
identify
two
separate
depth
ranges
enhanced
eddy
kinetic
energy,
located
around
maxima
buoyancy
frequency:
halocline
warm
(modified)
Atlantic
Water.
Simulations
reveal
notable
decrease
surface
layer
salinity
towards
north,
accompanied
high
variability
mixed
south-north
And
no
significant
horizontal
but
an
increase
from
west
east
0.084
m/km
gradient
0.6
standard
deviation,
indicating
opposite
characteristics
resolves
several
stationary
eddies
Water
provides
insights
into
associated
dynamics.
obtained
three-dimensional
temperature
be
used
further
analysis
thermohaline
related
submesoscale
Central
Arctic.
Dynamic
comparison
state-of-the-art
climate
Earth
System
Models.
developed
nudging
method
utilize
future
diverse
set
instruments.
Remote Sensing,
Journal Year:
2022,
Volume and Issue:
14(13), P. 3123 - 3123
Published: June 29, 2022
Arctic
coasts,
which
feature
land-ocean
transport
of
freshwater,
sediments,
and
other
terrestrial
material,
are
impacted
by
climate
change,
including
increased
temperatures,
melting
glaciers,
changes
in
precipitation
runoff.
These
trends
assumed
to
affect
productivity
fjordic
estuaries.
However,
the
spatial
extent
temporal
variation
freshwater-driven
darkening
fjords
remain
unresolved.
The
present
study
illustrates
spatio-temporal
variability
suspended
particulate
matter
(SPM)
Adventfjorden
estuary,
Svalbard,
using
in-situ
field
campaigns
ocean
colour
remote
sensing
(OCRS)
via
high-resolution
Sentinel-2
imagery.
To
compute
SPM
concentration
(CSPMsat),
a
semi-analytical
algorithm
was
regionally
calibrated
local
data,
improved
accuracy
satellite-derived
~20%
(MRD).
Analysis
for
two
consecutive
years
(2019,
2020)
revealed
strong
seasonality
Adventfjorden.
Highest
estimated
concentrations
river
plume
(%
fjord
with
CSPMsat
>
30
mg
L−1)
occurred
during
June,
July,
August.
Concurrently,
we
observed
relationship
between
average
air
temperature
over
24
h
prior
observation
(R2
=
0.69).
Considering
predicted
environmental
conditions
region,
this
highlights
importance
rapidly
changing
parameters
significance
analysing
fluxes
light
attenuating
particles,
especially
coastal
Ocean.
Frontiers in Microbiology,
Journal Year:
2024,
Volume and Issue:
15
Published: July 3, 2024
The
polar
regions
are
the
fastest
warming
places
on
earth.
Accelerated
glacial
melting
causes
increased
supply
of
nutrients
such
as
metal
oxides
(i.e.,
iron
and
manganese
oxides)
into
surrounding
environment,
marine
sediments
Potter
Cove,
King
George
Island/Isla
25
de
Mayo
(West
Antarctic
Peninsula).
Microbial
oxide
reduction
associated
microbial
communities
poorly
understood
in
sediments.
Here,
we
investigated
this
process
by
geochemical
measurements
situ
sediment
pore
water
slurry
incubation
experiments
which
were
accompanied
16S
rRNA
sequencing.
Members
genus
Desulfuromusa
main
responder
to
acetate
amendment
incubations.
Other
organisms
identified
relation
and/or
utilization
included
Desulfuromonas
,
Sva1033
(family
Desulfuromonadales
)
unclassified
Arcobacteraceae
.
Our
data
show
that
distinct
members
most
active
organotrophic
reduction,
thus
providing
strong
evidence
their
relevance
permanently
cold
Ecology and Evolution,
Journal Year:
2024,
Volume and Issue:
14(11)
Published: Nov. 1, 2024
ABSTRACT
In
the
West
Antarctic
Peninsula,
global
warming
has
led
to
severe
alterations
in
community
composition,
species
distribution,
and
abundance
over
last
decades.
Understanding
complex
interplay
between
structure
stability
of
marine
food
webs
is
crucial
for
assessing
ecosystem
resilience,
particularly
context
ongoing
environmental
changes.
this
study,
we
estimate
interaction
strength
within
Potter
Cove
(South
Shetland
Islands,
Antarctica)
web
elucidate
roles
its
functioning.
We
use
these
estimates
calculate
response
perturbations,
conducting
sequential
extinctions
quantify
importance
individual
based
on
changes
fragmentation.
explore
connections
key
topological
properties
web.
Our
findings
reveal
an
asymmetric
distribution
strengths,
with
a
prevalence
weak
interactions
few
strong
ones.
Species
exerting
greater
influence
displayed
higher
degree
trophic
similarity
but
occupied
lower
levels
omnivory
(e.g.,
macroalgae
detritus).
Extinction
simulations
revealed
role
certain
species,
amphipods
black
rockcod
Notothenia
coriiceps
,
as
their
removal
significant
network
This
study
highlights
considering
strengths
polar
ecosystems.
These
insights
have
implications
guiding
monitoring
conservation
strategies
aimed
at
preserving
integrity
Abstract.
The
Arctic
Ocean
is
a
region
important
for
global
and
regional
climate.
Although
generally
quiescent
compared
to
mid-latitudes,
the
upper
ocean
hosts
mesoscale
smaller
scale
processes.
These
processes
can
have
profound
impact
on
vertical
fluxes,
stratification,
feedback
with
sea
ice
atmosphere.
Sparse
non-synoptic
in-situ
observations
of
polar
oceans
are
limited
by
distribution
manual
observing
platforms
autonomous
instrumentation.
Analyzing
observational
data
assess
tracer
field
gradients
dynamics
becomes
highly
challenging
when
measurement
drift
pack
due
continuous
changes
in
speed
direction.
This
work
presents
dynamical
reconstruction
state,
based
Multidisciplinary
Observatory
Study
Climate
(MOSAiC)
experiment.
Overall,
model
reproduce
lateral
structure
temperature,
salinity,
density
fields,
which
allows
projecting
dynamically
consistent
features
these
fields
onto
regular
grid.
We
identify
two
separate
depth
ranges
enhanced
eddy
kinetic
energy,
located
around
maxima
buoyancy
frequency:
halocline
warm
(modified)
Atlantic
Water.
Simulations
reveal
notable
decrease
surface
layer
salinity
towards
north,
accompanied
high
variability
mixed
south-north
And
no
significant
horizontal
but
an
increase
from
west
east
0.084
m/km
gradient
0.6
standard
deviation,
indicating
opposite
characteristics
resolves
several
stationary
eddies
Water
provides
insights
into
associated
dynamics.
obtained
three-dimensional
temperature
be
used
further
analysis
thermohaline
related
submesoscale
Central
Arctic.
Dynamic
comparison
state-of-the-art
climate
Earth
System
Models.
developed
nudging
method
utilize
future
diverse
set
instruments.
Marine Geology,
Journal Year:
2023,
Volume and Issue:
467, P. 107189 - 107189
Published: Dec. 4, 2023
The
response
of
the
Antarctic
ice
sheet
to
climate
warming
is
main
source
uncertainty
regarding
future
global
sea
level
rise,
since
little
known
about
its
present
and
past
dynamics.
last
deglaciation
most
recent
interval
large-scale
warming,
during
which
Northern
Southern
Hemisphere
sheets
retreated,
rose
globally,
although
at
a
non-uniform
rate.
Geologic
records
from
polar
regions
are
fundamental
in
determining
factors
that
caused
major
changes
deglacial
under
different
boundary
conditions.
Here,
we
combine
morpho-bathymetric
seismic
data
with
sediment
cores
oceanographic
measurements
reconstruct
processes
influenced
deposition
southernmost,
extensive,
ultrahigh-resolution
record
Holocene
Edisto
Inlet
fjord
(Ross
Sea,
Antarctica).
We
find
post-glacial
sedimentation
resulted
layered
diatom
mud
up
110
m
thick
was
locally
redistributed
by
bottom
currents
over
confined
drifts-moats
central
part
fjord.
After
climatic
optimum,
not
carved
ground
ice,
there
continued
be
internal
water
circulation
associated
Ross
Sea
circulation.
These
results
support
retreat
coastal
glaciers
11
kiloyears
ago
(ka)
continental
shelf
North
Victoria
Land.
Ocean science,
Journal Year:
2024,
Volume and Issue:
20(3), P. 759 - 777
Published: June 11, 2024
Abstract.
This
paper
presents
a
methodological
tool
for
dynamic
reconstruction
of
the
state
ocean,
based,
as
an
example,
on
observations
from
Multidisciplinary
drifting
Observatory
Study
Arctic
Climate
(MOSAiC)
experiment.
The
data
used
in
this
study
were
collected
Amundsen
Basin
between
October
2019
and
January
2020.
Analysing
observational
to
assess
tracer
field
upper-ocean
dynamics
is
highly
challenging
when
measurement
platforms
drift
with
ice
pack
due
continuous
speed
direction
changes.
We
have
equipped
new
version
coastal
branch
global
Finite-volumE
sea
ice–Ocean
Model
(FESOM-C)
nudging
method.
was
carried
out
assuming
quasi-steady
state.
Overall,
model
can
reproduce
lateral
vertical
structure
temperature,
salinity,
density
fields,
which
allows
projecting
dynamically
consistent
features
these
fields
onto
regular
grid.
identify
two
separate
depth
ranges
enhanced
eddy
kinetic
energy
located
around
maxima
buoyancy
frequency:
upper
halocline
warm
(modified)
Atlantic
Water.
Simulations
reveal
notable
decrease
surface
layer
salinity
towards
north
but
no
significant
gradient
east
west.
However,
we
find
mixed-layer
deepening
west,
0.084
m
km−1
at
0.6
standard
deviation,
compared
weak
south
north.
resolves
several
stationary
eddies
Water
provides
insights
into
associated
dynamics.
output
be
further
analyse
thermohaline
related
mesoscale
submesoscale
processes
central
Arctic,
such
estimates
heat
fluxes
or
mass
transport.
developed
method
utilized
incorporate
diverse
set
instruments
analysis
MOSAiC
expedition.
Biogeosciences,
Journal Year:
2024,
Volume and Issue:
21(16), P. 3617 - 3639
Published: Aug. 20, 2024
Abstract.
In
polar
regions,
glaciers
are
retreating
onto
land,
gradually
widening
ice-free
coastal
waters,
which
known
to
act
as
new
sinks
of
atmospheric
carbon.
However,
the
increasing
delivery
inorganic
suspended
particulate
matter
(iSPM)
with
meltwater
might
significantly
impact
their
capacity
contribute
carbon
sequestration.
Here,
we
present
an
analysis
satellite,
meteorological,
and
SPM
data
well
results
a
coupled
physical–biogeochemical
model
(1D
GOTM-ECOSMO-E2E-Polar)
newly
implemented
iSPM
group
show
on
ecosystem
dynamics
in
warming
fjord
(Hornsund,
European
Arctic)
numerous
shallow-grounded
marine-terminating
glaciers.
Our
indicate
that
longer
melt
season
(9
d
per
decade,
1979–2022),
loss
sea
ice
cover
(44
1982–2021)
formation
marine
habitats
after
retreat
(around
100
km2
1976–2022,
38
%
increase
total
area),
glacial
has
transported
loads
from
land
(3.7
g
m−3
reconstructed
for
1979–2022).
The
simulated
light
limitation
induced
by
input
delayed
decreased
peaks
phytoplankton,
zooplankton,
macrobenthos.
areas
still
markedly
contributed
plankton
primary
secondary
production
burial
sediments
(5.1,
2.0,
0.9
Gg
C
yr−1,
respectively,
average
2005–2009
scenario).
these
values
would
have
been
5.0,
2.1,
0.1
yr−1
higher,
without
input.
Since
was
least
affected
(a
decrease
around
16
%,
comparison
50
production),
enhanced
land–ocean
connectivity
should
be
investigated
further
context
fluxes
expanding
fjords.
