Journal of Geophysical Research Oceans,
Год журнала:
2024,
Номер
129(7)
Опубликована: Июнь 27, 2024
Abstract
Previous
studies
have
primarily
focused
on
the
impact
of
human
activities
coastal
dissolved
organic
matter
(DOM)
cycles,
while
neglecting
role
dynamic
processes.
This
limits
our
comprehensive
understanding
processes
DOM,
particularly
in
waters
affected
by
multiple
In
this
study,
dynamics
DOM
northwestern
South
China
Sea
(SCS)
were
investigated
using
DOM‐related
parameters
and
a
three
end‐member
mixing
model,
which
accounted
for
effects
currents
upwelling
during
spring,
summer,
winter
seasons.
Our
results
demonstrated
that
net
addition
was
predominantly
observed
nearshore
all
seasons,
owing
to
strong
induced
phytoplankton
production
particle
desorption.
However,
weaker
spring
winter,
removal
decomposition
western
offshore
area.
observation
can
be
attributed
abundance
microorganisms
increased
vertical
water
winter.
Conversely,
stronger
provided
more
bio‐refractory
limiting
its
decomposition,
whereas
stimulated
productivity
desorption,
resulting
period.
eastern
area,
primary
mechanism
eliminating
weak
or
absent
upwelling.
study
revealed
is
widespread
regions
SCS
facilitate
DOM.
Frontiers in Marine Science,
Год журнала:
2024,
Номер
11
Опубликована: Май 10, 2024
In
the
summer
of
2021,
two
typhoons,
Typhoon
Cempaka
and
Lupit,
passed
through
Pearl
River
Estuary
(PRE),
resulting
in
a
noticeable
chlorophyll-a
(Chla)
bloom
event
on
west
side
PRE.
Utilizing
coupled
hydrodynamic-ecological
model
(ROMS-CoSiNE),
we
investigated
changes
marine
environment
during
two-typhoon
period
explored
underlying
mechanisms
involved.
Our
effectively
reproduces
spatial
characteristics
typhoon-induced
algal
blooms.
The
results
suggest
that
westward
invasion
plume
has
predominant
impact
alterations
biochemical
elements.
For
further
quantitative
analyses,
utilized
to
determine
Chla
concentration
budget
region
assess
dominant
mechanism,
particularly
focusing
horizontal
advection.
findings
indicated
events
are
mainly
attributed
straightforward
physical
namely,
phytoplankton
transportation,
rather
than
nutrient-induced
growth.
study
also
revealed
different
growth
processes
simulated
species
did
not
contribute
positively
increased
concentrations.
However,
research
is
needed
investigate
impacts
functional
groups
ecological
under
influence
typhoons.
This
enhances
understanding
response
environments
coastal
areas
Frontiers in Marine Science,
Год журнала:
2024,
Номер
11
Опубликована: Март 22, 2024
Previous
investigations
confirm
that
typhoons
deliver
both
dissolved
oxygen
and
nutrient
sources
via
promoting
vertical/lateral
exchanges
between
water
masses.
The
former
one
replenishes
for
the
bottom
prevents
persistent
depletion,
while
latter
facilitates
primary
production
subsequent
subsurface
consumption.
However,
it
is
left
unknown
if
ultimately
result
in
net
gain
or
loss
of
during
passage.
Tropical
cyclone
information,
satellite
observations,
numerical
simulations
were
used
to
investigate
response
dynamics
typhoons.
Results
imply
typhoon
intensity,
distance
track
Changjiang
estuary
control
magnitude
responses
production,
air-sea
flux,
advection-induced
variation,
consumption
variation.
model-based
budget
analysis
indicated
content
increased
after
passage
all
occurred
2011-2020.
findings
this
study
suggest
oxygen.
strength
frequency
warming
future
would
play
an
important
role
counteracting
deoxygenation,
which
likely
slow
down
pace
deterioration
seasonal
hypoxia
region.
Frontiers in Marine Science,
Год журнала:
2024,
Номер
11
Опубликована: Март 27, 2024
Typhoons
can
greatly
alter
the
hydrodynamic
and
nutrient
supply
in
coastal
oceans.
However,
due
to
complex
conditions
of
typhoons,
such
as
their
intensity,
even
slight
changes
may
cause
substantial
hydrodynamics
supply,
which
needs
be
better
understood.
In
this
study,
we
conducted
two
cruises
before
after
Typhoon
Talim
(2023)
quantitatively
investigate
Zhanjiang
Bay
using
dual
water
isotopes.
Before
typhoon,
strong
stratification
occurred
bay.
external
force
typhoon
destroyed
substantially
changed
mixing
bay
typhoon.
upper
bay,
massive
freshwater
input
remarkably
decreased
salinity
during
post-typhoon
period
(freshwater
increased
by
18%).
contrast,
variation
lower
was
minimal,
mainly
seawater
intrusion
from
outer
induced
typhoon;
mixed
with
columns
forming
a
ocean
front.
The
intensity
fronts
typhoons
directly
depended
on
landing
Bay,
stronger
will
more
high-salinity
Due
formation
front,
terrestrial
nutrients
are
prevented
being
transported
downwards,
resulting
large
amount
accumulated
pollutants
within
By
impact
intrusion,
contribution
has
increased,
thereby
diluting
This
study
provides
new
insight
into
responses
marine
eco-environment
systems
typhoons.
