Limnology and Oceanography,
Год журнала:
2024,
Номер
unknown
Опубликована: Ноя. 5, 2024
Abstract
This
study
aimed
to
comprehend
the
effects
of
Typhoon
Maria
on
pelagic
ecosystem
in
southern
East
China
Sea.
Shipboard
measurements
were
conducted
at
eight
sampling
stations
before
(2–4
d)
and
after
(3–6
typhoon,
which
enabled
evaluation
potential
impacts
typhoon
this
ecosystem,
with
particular
focus
carbon
dynamics.
Following
typhoon's
passage,
there
was
a
slight
drop
sea
surface
temperature.
The
response
variables
however,
exhibited
variations
different
stations.
For
further
analysis,
t
‐tests
compared
variables,
while
type
II
regression
assessed
linear
correlation
between
two
variables.
Overall,
during
post‐typhoon
period,
concentrations
nitrate,
chlorophyll
,
primary
production,
bacterial
biomass
plankton
community
respiration,
abundance
large
phytoplankton
(>
2
μ
m)
relative
picophytoplankton
among
larger‐sized
picoeukaryotes
higher
pre‐typhoon
period.
mean
value
fugacity
CO
similar
or
slightly
lower
than
Although
typhoon‐induced
vigorous
production
might
have
absorbed
significant
amount
decrease
could
been
offset
by
respiration.
findings
suggest
that
enhanced
physical
disturbance
increased
water
column
mixing,
which,
turn,
augmented
nutrient
availability
promoted
growth
shallow
column.
sheds
light
complex
interactions
typhoons
marine
ecosystems
highlights
importance
investigating
these
phenomena
better
understand
their
ecological
implications.
Journal of Geophysical Research Biogeosciences,
Год журнала:
2025,
Номер
130(3)
Опубликована: Март 1, 2025
Abstract
Under
the
influence
of
global
climate
change,
both
frequency
and
intensity
typhoons
are
increasing.
This
study
examines
impact
typhoon
on
nitrous
oxide
(N
2
O)
dynamics
in
coastal
bays,
which
most
active
areas
N
O
production
ocean.
Employing
15
stable
isotope
labeling
technique,
coupled
with
mass
spectrometry
analysis
key
biogeochemical
parameters,
we
conducted
a
series
five
continuous
cruises
before
(one
cruise)
after
Chaba
(four
cruises)
Zhanjiang
Bay,
semiclosed
bay
northern
South
China
Sea.
Our
results
showed
that
landfall
led
to
sharp
decrease
concentration
Bay.
However,
also
triggered
substantial
water
column
sedimentary
environments,
therefore
facilitating
rapid
recovery
levels
within
short
period.
In
column,
typhoon‐induced
enhancement
situ
could
be
attributed
input
nutrients
terrestrial
particles,
creates
an
anaerobic
or
hypoxic
microenvironment
conducive
production.
Concurrently,
sediment,
deposition
particles
derived
from
phytoplankton
blooms
introduces
large
amount
fresh
particulate
organic
matter,
further
promoting
findings
suggest
efficient
nitrogen
removal
process,
has
been
previously
underestimated.
By
elucidating
aspects
cycle
bays
during
typhoons,
this
research
aids
shaping
policies
mitigate
greenhouse
gas
emissions
by
typhoons.
Proceedings of the National Academy of Sciences,
Год журнала:
2025,
Номер
122(12)
Опубликована: Март 17, 2025
Forested
wetlands
such
as
mangroves
are
considered
highly
valuable
for
nature-based
mitigation
of
coastal
flooding.
However,
their
wave
attenuation
capacity
during
extreme
storms,
when
risks
highest,
is
rarely
measured
and
remains
challenging
to
predict.
Here,
we
compile
a
unique
dataset
on
the
largest
incident
heights
(0.39
1.44
m)
ever
recorded
in
forested
wetlands,
including
our
own
measurements
literature
data.
Our
analysis
reveals
that
can
significantly
attenuate
storm
waves
(35%
over
3
wavelengths)
except
rare
near-submerged
cases.
Notably,
19
20
existing
formulations
vegetation
drag
coefficient,
key
parameter
modeling,
inapplicable
conditions.
Hence,
introduce
an
new
approach
reliably
predict
without
need
coefficient
determination
nor
modeling
expertise.
This
offers
practitioners
user-friendly
tool
assess
effectiveness
solutions
hazard
mitigation.
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.
Agricultural Water Management,
Год журнала:
2024,
Номер
298, С. 108872 - 108872
Опубликована: Май 11, 2024
Technological
advancements
in
isotope
techniques
have
been
widely
utilized
environmental
pollution
research,
particularly
for
the
monitoring
of
nitrate
water.
The
utilization
pretreatment
with
an
aqueous
nitric
acid
solution
offers
numerous
advantages
analyzing
isotopic
composition;
however,
there
is
still
room
improvement
regarding
conversion
efficiency,
reduced
reaction
time,
and
cost
control.
In
light
this,
this
study
proposes
enhanced
chemical
method
that
involves
mitigating
interference
caused
by
nitrogen
azide
during
process,
optimizing
purge
gas
to
remove
interfering
factors,
improving
inlet
device
measuring
nitrous
oxide.
improved
was
applied
determine
isotopes
Ulansuhai
Basin,
Inner
Mongolia
its
reliability
verified
through
analytical
results
obtained
from
bacterial
denitrification
methods.
mean
δ15N-NO3-
δ18O-NO3-
values
determined
using
transformation
were
4.85‰
23.44‰,
respectively.
Compared
previous
method,
maneuverability
precise
control,
time
2
3
hours
1.5
hours,
experimental
scaled
down
half
original
one.
addition,
contribution
each
source
calculated
combining
a
Bayesian
stable
mixing
model.
It
found
manure
sewage
accounted
(50.1±22.6)
%
while
soil
sources
contributed
(25.1±20.4)
levels
Lake's
methods
successfully
within
can
also
be
other
watersheds
or
regions.
These
research
findings
provide
valuable
theoretical
foundation
managing
watersheds.
