Water,
Journal Year:
2025,
Volume and Issue:
17(4), P. 571 - 571
Published: Feb. 17, 2025
Seaweed
plays
a
critical
role
in
marine
carbon
sequestration
due
to
its
high
release
rate
of
organic
matter.
However,
the
impacts
Porphyra
cultivation
on
concentration
and
composition
dissolved,
particulate
sedimentary
matter
(DOM,
POM
SOM)
coastal
zones
remain
unclear.
Herein,
we
investigated
optical
properties
DOM,
SOM
along
transect
from
subtropical
Chi
River
adjacent
zone
Dayu
Bay
(southeast
China)
during
late
stage.
The
results
revealed
that
all
types
were
predominantly
characterized
by
highly
autochthonous
sources,
contrasting
sharply
with
allochthonous,
terrestrial
sources
observed
at
freshwater
sites.
estuarine
mixing
model
principal
component
analysis
further
indicated
dynamics
are
primarily
controlled
cultivation,
relatively
limited
contributions
riverine
inputs,
sediment
porewater
sources.
leads
significant
additions
protein-like
components
water
sediment.
Microbial
degradation
incubations
DOM
demonstrated
promotes
situ
production
humic-like
(peak
M)
water.
exhibited
higher
microbial
transformation
efficiency
into
refractory
than
POM,
suggesting
more
substantial
sequestration.
Our
findings
underscore
potential
enhance
ecosystems.
Environmental Science & Technology,
Journal Year:
2023,
Volume and Issue:
57(46), P. 17900 - 17909
Published: April 20, 2023
Dissolved
organic
matter
(DOM)
is
a
complex
mixture
of
molecules
that
constitutes
one
the
largest
reservoirs
on
Earth.
While
stable
carbon
isotope
values
(δ13C)
provide
valuable
insights
into
DOM
transformations
from
land
to
ocean,
it
remains
unclear
how
individual
respond
changes
in
properties
such
as
δ13C.
To
address
this,
we
employed
Fourier
transform
ion
cyclotron
resonance
mass
spectrometry
(FT-ICR
MS)
characterize
molecular
composition
510
samples
China
Coastal
Environments,
with
320
having
δ13C
measurements.
Utilizing
machine
learning
model
based
5199
formulas,
predicted
mean
absolute
error
(MAE)
0.30‰
training
data
set,
surpassing
traditional
linear
regression
methods
(MAE
0.85‰).
Our
findings
suggest
degradation
processes,
microbial
activities,
and
primary
production
regulate
rivers
ocean
continuum.
Additionally,
accurately
without
known
other
published
sets,
reflecting
trend
along
This
study
demonstrates
potential
capture
relationships
between
bulk
parameters,
particularly
larger
sets
increasing
research
future.
Frontiers in Marine Science,
Journal Year:
2022,
Volume and Issue:
9
Published: July 15, 2022
Changes
in
the
molecular
composition
of
dissolved
organic
matter
(DOM)
and
its
light-absorbing
component
(CDOM)
along
river–coastal
ocean
continuum
are
crucial
for
better
understanding
source
fate
DOM
coastal
oceans.
Both
optical
(absorbance
fluorescence)
techniques
ultrahigh-resolution
mass
spectrometry
have
been
widely
used
to
trace
cycling.
However,
best
our
knowledge,
linkage
between
these
two
is
rarely
investigated
continuum.
In
this
regard,
bulk
characterization,
techniques,
[Fourier
transform
ion
cyclotron
resonance
spectrometer
(FT-ICR
MS)]
were
applied
determine
chemistry
a
spatial
transect
from
Yangtze
River
Estuary
(YRE)
East
China
Sea.
The
results
showed
that
YRE
was
mainly
controlled
by
mixing
freshwater
seawater.
Besides
terrestrial
input,
multiple
sources
(tributary
input
Huangpu
River,
wastewater
sediment
resuspension
subsequent
release
at
turbidity
maximum
zone)
identified.
addition,
linkages
CDOM
thousands
formulas
developed
based
on
Spearman’s
rank
correlations
parameters
FT-ICR
MS
peaks.
groups
associated
with
generally
agreed
conventional
biogeochemical
interpretations.
Nevertheless,
each
technique
has
unique
advantage
weakness
interpreting
composition.
Therefore,
combination
untargeted
approach
could
be
valuable
studying
transformation
large
river
estuarine
systems.
