Journal of Geophysical Research Biogeosciences,
Journal Year:
2023,
Volume and Issue:
128(2)
Published: Feb. 1, 2023
Abstract
Net
ecosystem
production
(NEP)
by
submerged
aquatic
vegetation
plays
a
substantial
role
in
capturing
atmospheric
carbon
dioxide
into
ecosystems.
In
lakes
and
estuaries,
the
net
uptake
of
is
mediated
stratification
water
column
which
suppresses
vertical
flux
between
upper
lower
layers.
The
presence
can
also
affect
strength
such
that
interactions
vegetation,
stratification,
NEP
moderate
emissions.
Since
occur
there
need
for
new
numerical
approach
able
to
consider
effect
on
NEP,
dioxide.
This
study
aims
develop
model
investigate
how
density
flexibility,
affects
partial
pressure
(
p
CO
2
)
dissolved
inorganic
(DIC).
After
initial
parameterization
coefficients
based
experimental
work,
horizontal
variations
DIC
were
successfully
modeled
spatially
(horizontally)
integrated
(SiDIC)
model,
was
validated
with
field
observations
from
an
estuarine
freshwater
lake
case
study.
SiDIC
reproduce
changes
daytime
nighttime
throughout
column.
Sensitivity
tests
showed
fluctuation
controlled
suppression
due
vegetation.
results
highlight
importance
resolving
vegetation‐induced
when
modeling
budget
within
coastal
environments.
The Science of The Total Environment,
Journal Year:
2021,
Volume and Issue:
803, P. 150044 - 150044
Published: Sept. 3, 2021
A
typhoon
is
extreme
weather
that
flushes
terrestrial
carbon
(C)
loads
and
temporally
mixes
the
entire
water
columns
of
lakes
in
subtropical
regions.
C
flux
varies
based
on
trophic
level
associated
with
ecological
cycle
related
to
hydraulic
retention
time
(residence
time).
Herein,
we
sought
clarify
how
disturbance
from
a
affect
regimes
two
mountain
humid
region
Taiwan
different
levels—oligotrophic
mesotrophic.
We
investigated
meteorological
data
vertical
profiles
temperature,
dissolved
inorganic
(DIC),
organic
(DOC),
chlorophyll
(Chl.
a)
during
pre-typhoon
period
(April–July),
(August–November),
post-typhoon
(December–March)
for
five
years
(2009–2010
2015–2017).
applied
three-dimensional
environmental
model
(Fantom)
investigate
effect
net
ecosystem
production
(NEP)
using
residence
stratified
lakes.
The
results
demonstrate
typhoon-induced
mixing
plays
one
critical
roles
controlling
NEP
shallow
Water Resources Research,
Journal Year:
2020,
Volume and Issue:
56(8)
Published: Aug. 1, 2020
Abstract
Aquatic
models
used
for
both
freshwater
and
marine
systems
frequently
need
to
account
submerged
aquatic
vegetation
(SAV)
due
its
influence
on
flow
water
quality.
Despite
importance,
parameterizations
are
generally
adopted
that
simplify
feedbacks
from
SAV,
such
as
canopy
properties
(e.g.,
considering
the
deflected
height)
bulk
friction
coefficient.
This
study
reports
development
of
a
fine‐scale
non‐hydrostatic
model
demonstrates
two‐way
effects
SAV
motion
interaction
with
flow.
An
object‐oriented
approach
is
applied
capture
multiphase
phenomena,
whereby
leaf‐scale
based
discrete
element
method
combined
dynamics
resolve
stresses
currents
waves.
The
verified
through
application
laboratory‐scale
seagrass
bed.
A
force
balance
analysis
revealed
leaf
elasticity
buoyancy
most
significant
components
influencing
horizontal
vertical
momentum
equations,
respectively.
sensitivity
canopy‐scale
coefficients
depth,
current
speeds,
density
was
explored.
Deeper
also
shown
lead
smaller
decrease
in
height.
can
contribute
improving
assessment
processes
quality,
sediment
stabilization,
carbon
sequestration,
restoration,
thereby
supporting
an
understanding
how
waterways
coasts
will
respond
changes
brought
about
by
changing
climate.
Journal of Geophysical Research Biogeosciences,
Journal Year:
2021,
Volume and Issue:
126(4)
Published: March 18, 2021
Abstract
Thermal
stratification
is
a
critical
physical
process
controlling
carbon
(C)
flux
from
lakes
into
the
atmosphere.
In
general,
vertical
water
temperature
profiles
in
shallow
subtropical
can
vary
significantly
because
typhoons
frequently
induce
mixing
across
entire
lake
due
to
strong
winds
and
rapid
flushing
river
inputs.
Since
C
fluxes
are
driven
by
dissolved
inorganic
(DIC),
it
necessary
understand
stratification's
influence
on
DIC
dynamics
lakes.
Therefore,
we
aimed
clarify
impact
of
Yuan‐Yang
Lake,
typical
mountain
lake,
developing
net
ecosystem
production
(NEP)
model.
We
measured
profile
once
or
twice
month
July
2004
December
2017.
applied
three‐dimensional
hydrological
model
estimate
residence
time
NEP,
which
revealed
that
large
amounts
stored
lower
layer
spring
summer
suppression
stratification.
autumn
winter,
was
well
mixed,
evenly
distributed
column
mixing.
This
confirmed
profiles.
Heliyon,
Journal Year:
2023,
Volume and Issue:
9(10), P. e20322 - e20322
Published: Sept. 20, 2023
Carbon
capture
and
storage
due
to
photosynthesis
activities
has
been
proposed
as
a
carbon
sink
mitigate
climate
change.
To
enhance
such
mitigation,
previous
studies
have
shown
that
freshwater
lakes
should
be
included
in
the
sink,
since
they
may
much
coastal
areas.
In
eutrophic
lakes,
there
is
uncertainty
about
whether
equilibrium
equation
can
estimate
partial
pressure
of
dioxide
(pCO2),
owing
presence
phytoplankton,
pH
measurement
error
fluid.
Thus,
this
study
investigated
applicability
revealed
need
modify
it.
The
modified
was
successfully
applied
reproduce
pCO2
based
on
total
alkalinity
through
field
observations.
addition,
at
water
surface
lower
than
atmospheric
by
phytoplankton
during
strong
stratification.
stratification
effect
low
verified
using
Net
Ecosystem
Production
(NEP)
model,
submerged
plants
Potamogeton
malaianus
were
found
high
potential
for
dissolved
inorganic
(DIC)
sequestration
lake.
These
results
provide
starting
point
toward
more
sophisticated
methods
investigate
DIC
uptake
stratified
lakes.
Frontiers in Marine Science,
Journal Year:
2023,
Volume and Issue:
9
Published: Jan. 9, 2023
Research
and
social
implementation
related
to
carbon
in
marine
freshwater
ecosystems
are
increasingly
gaining
emphasis
the
global
quest
achieve
neutrality.
It
is
important
not
only
advance
academic
research,
but
also
solve
practical
problems
for
improved
understanding,
maintenance,
dissemination
of
information
on
or
areas.
In
this
study,
we
conducted
a
questionnaire
survey
participants
activities
areas
Japan
clarify
which
issues
were
considered
their
understanding
degree
had
been
achieved.
Based
responses
all
questions,
77.9%
respondents,
average,
among
practitioners
recognized
importance
program
strongly,
while
46.5%
that
achievement
was
insufficient.
This
tendency
more
pronounced
than
areas(72.2%
48.6%,
respectively).
The
results,
grouped
by
respondent
attributes,
revealed
perception
level
varied
depending
organization
activity,
age,
years
knowledge
and/or
Practitioners
with
greater
experience
those
working
specific
implementations
perceived
implementation-related
aspects
as
less
accomplished
ones.
study
provides
valuable
insights
into
research
Frontiers in Marine Science,
Journal Year:
2022,
Volume and Issue:
9
Published: Oct. 6, 2022
Shallow
coastal
waters
(SCWs)
have
attracted
wide
attention
in
recent
years
due
to
their
strong
carbon
sequestration
capacity.
However,
the
complex
dioxide
(CO
2
)
dynamics
water
column
makes
it
difficult
estimate
air–water
CO
fluxes
(F
CO2
accurately.
We
developed
a
numerical
model
of
based
on
field
measurements
for
typical
stratified
semi-enclosed
shallow
bay:
Yatsushiro
Sea,
Japan.
The
showed
an
excellent
ability
reproduce
stratification
and
Sea.
Through
simulations,
we
analyzed
annual
Sea
2018.
results
show
that
effect
seawater
varies
greatly
depending
distance
from
estuary
period.
In
estuarine
region,
manifests
itself
throughout
year
by
promoting
maintenance
high
partial
pressure
(pCO
surface
waters,
resulting
pCO
being
higher
than
atmospheric
up
40
days
during
flood
period
(average
539.94
µatm).
contrast,
areas
farther
estuary,
mainly
acts
promote
periods
freshwater
influence.
Then
changes
lower
before
influence
leads
towards
complete
dissipation.
Finally,
estimated
F
2018,
was
sink
area
2018
(−1.70
mmol/m
/day).
