Journal of Geophysical Research Oceans,
Journal Year:
2022,
Volume and Issue:
127(11)
Published: Oct. 25, 2022
Abstract
This
paper
investigates
the
role
of
semidiurnal
tides
in
Hanna
Shoal
region
on
northeastern
Chukchi
Sea
shelf
to
evaluate
their
impact
regional
dynamics.
The
study
is
based
2‐year
long
velocity
time
series
from
five
oceanographic
moorings.
These
records
indicate
dominance
wind‐generated
near‐inertial
energy
during
summer
season
with
low
ice
cover.
However,
when
ocean
fully
covered
by
sea
ice,
dominate
variability
band.
reveal
considerable
seasonal
as
well
differences,
where
barotropic
well‐mixed
waters
west
while
bottom‐trapped
internal
(depth‐dependent)
are
observed
east
Shoal,
stratification
can
persist
year‐round.
Resulting
tide‐driven
shear
winter
under
stratified
conditions
occasionally
reach
level
a
Richardson
number
below
1
and
be
∼0.25,
implying
likelihood
instability
potentially
eroding
lower
water
column
stability.
may
lead
upward
fluxes
near‐bottom
nutrient‐rich
Winter
Water
thus
carries
ecosystem
implications.
Our
indicates
that
modulated
spring‐neap
cycle
result
interaction
local
bathymetry
stratification.
Abstract.
Decreasing
sea
ice
extent
in
summer
caused
by
climate
change
is
affecting
the
carbon
cycle
of
Arctic
Ocean.
In
this
study,
surface
sediments
across
western
Ocean
are
investigated
to
characterize
sources
sedimentary
organic
(OC).
Bulk
parameters
(total
carbon,
total
nitrogen,
δ13Corg
and
δ15N)
combined
with
molecular
biomarkers
(e.g.,
sterols
highly
branched
isoprenoids
(HBIs))
applied
distinguish
between
sympagic,
pelagic,
terrestrial
OC.
Furthermore,
downcore
profiles
these
were
also
generated
from
Chukchi
Sea
R1
core
(74°
N)
evaluate
changes
relative
contribution
three
components
OC
over
last
200
years
decreasing
ice.
Our
data
evidence
that
1820s
1930s,
prevailing
high
variable
cover
inhibited
in
situ
primary
production
resulting
prominent
land-derived
material
stored
sediments.
From
1930s
1980s,
gradual
decline
ice,
increased
progressively.
The
ratio
sympagic
pelagic
began
rise
account
for
a
larger
portion
Since
accelerated
loss
led
enhanced
production,
stabilizing
decades
due
freshwater
induced
ocean
stratification
summer.
Abstract.
Decreasing
sea
ice
extent
in
summer
caused
by
climate
change
is
affecting
the
carbon
cycle
of
Arctic
Ocean.
In
this
study,
surface
sediments
across
western
Ocean
are
investigated
to
characterize
sources
sedimentary
organic
(OC).
Bulk
parameters
(total
carbon,
total
nitrogen,
δ13Corg
and
δ15N)
combined
with
molecular
biomarkers
(e.g.,
sterols
highly
branched
isoprenoids
(HBIs))
applied
distinguish
between
sympagic,
pelagic,
terrestrial
OC.
Furthermore,
downcore
profiles
these
were
also
generated
from
Chukchi
Sea
R1
core
(74°
N)
evaluate
changes
relative
contribution
three
components
OC
over
last
200
years
decreasing
ice.
Our
data
evidence
that
1820s
1930s,
prevailing
high
variable
cover
inhibited
in
situ
primary
production
resulting
prominent
land-derived
material
stored
sediments.
From
1930s
1980s,
gradual
decline
ice,
increased
progressively.
The
ratio
sympagic
pelagic
began
rise
account
for
a
larger
portion
Since
accelerated
loss
led
enhanced
production,
stabilizing
decades
due
freshwater
induced
ocean
stratification
summer.
Abstract.
Decreasing
sea
ice
extent
in
summer
caused
by
climate
change
is
affecting
the
carbon
cycle
of
Arctic
Ocean.
In
this
study,
surface
sediments
across
western
Ocean
are
investigated
to
characterize
sources
sedimentary
organic
(OC).
Bulk
parameters
(total
carbon,
total
nitrogen,
δ13Corg
and
δ15N)
combined
with
molecular
biomarkers
(e.g.,
sterols
highly
branched
isoprenoids
(HBIs))
applied
distinguish
between
sympagic,
pelagic,
terrestrial
OC.
Furthermore,
downcore
profiles
these
were
also
generated
from
Chukchi
Sea
R1
core
(74°
N)
evaluate
changes
relative
contribution
three
components
OC
over
last
200
years
decreasing
ice.
Our
data
evidence
that
1820s
1930s,
prevailing
high
variable
cover
inhibited
in
situ
primary
production
resulting
prominent
land-derived
material
stored
sediments.
From
1930s
1980s,
gradual
decline
ice,
increased
progressively.
The
ratio
sympagic
pelagic
began
rise
account
for
a
larger
portion
Since
accelerated
loss
led
enhanced
production,
stabilizing
decades
due
freshwater
induced
ocean
stratification
summer.
Journal of Geophysical Research Oceans,
Journal Year:
2022,
Volume and Issue:
127(11)
Published: Oct. 25, 2022
Abstract
This
paper
investigates
the
role
of
semidiurnal
tides
in
Hanna
Shoal
region
on
northeastern
Chukchi
Sea
shelf
to
evaluate
their
impact
regional
dynamics.
The
study
is
based
2‐year
long
velocity
time
series
from
five
oceanographic
moorings.
These
records
indicate
dominance
wind‐generated
near‐inertial
energy
during
summer
season
with
low
ice
cover.
However,
when
ocean
fully
covered
by
sea
ice,
dominate
variability
band.
reveal
considerable
seasonal
as
well
differences,
where
barotropic
well‐mixed
waters
west
while
bottom‐trapped
internal
(depth‐dependent)
are
observed
east
Shoal,
stratification
can
persist
year‐round.
Resulting
tide‐driven
shear
winter
under
stratified
conditions
occasionally
reach
level
a
Richardson
number
below
1
and
be
∼0.25,
implying
likelihood
instability
potentially
eroding
lower
water
column
stability.
may
lead
upward
fluxes
near‐bottom
nutrient‐rich
Winter
Water
thus
carries
ecosystem
implications.
Our
indicates
that
modulated
spring‐neap
cycle
result
interaction
local
bathymetry
stratification.
